specifications for electrical

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PROPOSED CHURCH, PRIEST HOUSE AND BOUNDARY FENCE ON

PLOT No. LR 1/564 KILIMANI

FOR

ETHIOPIAN ORTHODOX CHURCHP.O. BOX 76025

NAIROBI

ELECTRICAL ENGINEERING SERVICES SUB - CONTRACT

CONDITIONS, SPECIFICATIONS AND BILLS OF QUANTITIES.

NAME OF TENDERER: .....................................................................….

........................................................................................................................

ELECTRICAL ENGINEER PROJECT MANAGER

SYNCHROCONSULT ASSOCIATES GADO CONSULTING ENGINEERS

P. O. BOX 79626 00200 P.O. BOX 54400NAIROBI NAIROBI



JULY 2005

INSTRUCTIONS TO TENDERERS

1. Tenders shall be submitted on the form of tender attached and all blanks in thisspace are to be filled.

2. The tenderer and all other recipients of this document are to treat it as private and

confidential.3. The employer does not bind himself to accept the lowest or any tender and will not

be responsible for paying any expenses of losses which may be incurred by any

tenderer in the preparation of his tender.4. The tender and all accompanying documents shall be enclosed in a plain sealed

envelope marked : Proposed Church, Priest House and Boundary fence on plot No.

Lr 1/564 Kilimani

5. The sub-contract will deem to have been awarded when formal notice is given tothe tenderer that the employer has accepted the tenderers proposals.

6. The tender must be received at the address given below not later than 12.00 noon

on the day stated in the covering letter :-

ETHIOPIAN ORTHODOX CHURCH

P.O. BOX 76025NAIROBI.

2



FORM OF TENDER

ELECTRICAL SERVICES

TO : ETHIOPIAN ORTHODOX CHURCH

P.O. BOX 48231 00100

NAIROBI

1. I/We understand that works, the subject of this Tender, are covered by a prime cost

of provisional sum in the main contract entered into by the main contractor.

I/We shall become a Nominated sub-Contractor, that is to say, a sub-contractor nominated by the interior designers under the terms and conditions of the current

form of agreement and schedule of conditions , of Building Contract published by

the interior designers Sural Association of Kenya (latest edition with quantities).

2. It is confirmed that I/we have notice of all the provisions of the main contract

including the detailed prices of the contract in the schedule and Bill of Quantities.

I/We undertake in accordance with the particulars set out in the preliminaries and tothe satisfaction of the interior designers, to execute and complete the sub-contract

works as described in the specification and drawings for the sum of KENYA

SHILLINGS ............................................................................................................................... only (KSH............................................/=)

3. I/We confirm that this Tender is subject to adjustments by any variation ordered bythe interior designers in accordance with the terms of the main contract.

4. I/We undertake to commence the works within 7 days from the date of official

confirmation of the acceptance of the Tender.

5. I/We further undertake to complete the work in accordance with the Main

Contractors programme.

6. I/We agree that this Tender shall be open for acceptance by the interior designers

within 90 days from the date given below.

7. I/We understand that you are not bound to accept the lowest or any Tender.

For and on behalf of :

..........................................................................................................................……………..

................................................................................................................................................

......................................................................................................................................……..

Signature/Official Stamp : …….............................................................................……....

Date :.......................................................................………………………………………..

3



..........................................................................................................................................…..

CLAUSE DESCRIPTION PAGE

1.00 PART A: CONTRACT PRELIMINARIES & CONDITIONS

1.01 descriptions 7-9

1.02 Imported fittings 10

1.03 Sub-Contract Agreement 10

1.04 Firm Price Contract 101.05 Prime Cost & Provisional Sum 10

1.06 Guarantee 101.07 Storage of Materials on site 10

1.08 Principal Contractor's Liability 10

1.09 Labour 10

1.10 Supervision 10

1.11 Facilities for Inspection 10

1.12 Discrepancies 10

1.13 Variations 10

1.14 Ordering of Materials 111.15 Faulty Work or Materials 11

1.16 Final Account 11

1.17 Validity of Tender 111.18 Existing Property 11

1.19 Samples 11

1.20 Site Conditions 11

1.21 Materials, Tools, Plants 11

1.22 Insurance 111.23 Casing Up and Protection 11

1.24 Defect Liability Period 11

1.25 Bond 11

1.26 Damages For Delay 11

1.27 Clear Away on Completion 11

1.28 Security 11

1.29 Measured Work 11

1.30 Setting Out 12

1.30A Taxes and duty 13

1.31 Fair Wages 131.32 Government ordinance and regulations 13

1.33 Scope of Contract 13

1.34 Housing 13

1.35 Duration of Contract 13

1.36 Documents to be checked 13

1.37 Water, Electricity and Telephone 132.00 PART B: GENERAL SPECIFICATION FOR ELECTRICAL WORKS

2.01 Regulations and Standards Applicable 142.02 Scope 14

2.03 As Installed Drawings 14

2.04 Contract Drawing 14

2.05 Working Drawings 142.06 Materials 14

2.07 Labels 14

2.08 Galvanising 15

2.09 Cleaning and Painting 152.10 Fire Precautions 15

2.11 Radio Interference 15

2.12 Padlocks 15

2.13 Tool 15

4



2.14 Expansion Joint 15

2.15 MV Switchboard and Switchgear 15


2.16 Circuit Breakers 15

2.17 Fuse Switches 15

2.18 Farthing and Bonding 152.19 Neutral Bars 16

2.20 Switch Fuses 162.21 Distribution Boards 16

2.22 Consumer Units 16

2.23 Labelling of Switchgear and Distribution Boards 16

2.3.00 CABLES 16

2.3.01 P.V.C. 1 Cable 16

2.3.02 P.V.C. SWA P.V.C. Cables 16

2.3.03 Mineral Insulated Cables 16

2.4.00 WIRING SYSTEMS 16

2.4.01 Method of Wiring 162.4.02 System A - Cables Enclosed in Concealed Steel Screwed Conduit or Trunking

2.4.03 System B - Cables Enclosed in Steel Screwed Conduit or Trunking Fixed to the

Surface or Walls and Ceilings

16

2.4.04 System C - PVC Insulated Cables with Insulated Earth Continuity Conductor Enclosed

in Concealed Non-Metallic Conduit or Trunking

17

2.4.05 System D - PVC Insulated Cables with Insulated Earth Continuity Conduct Enclosed

in Non-Metallic Conduit or Trunking Fixed to the Surface of Walls and Ceilings 17

2.4.06 System E - Mineral Insulated Copper Sheathed Cables 172.4.07 Steel Conduit 17

2.4.08 Steel Trunking 18

2.4.09 Non-Metallic Conduit 18

2.4.10 Flexible Conduit 18

2.4.11 Cable Trays 19

5




2.5 Socket Outlets 19

2.6 Fused Connection Units 20

2.7 Lighting Switches 202.8 Ceiling Roses 20

2.9 Lampholders 202.10 Lighting Fitting 20

2.11 Flexible Cords 21

2.12 Earthing 21

2.13 P.M.E. System 22

2.14 Commissioning 22

3.00 PART C: PARTICULAR SPECIFICATIONS

3.01 Location of the Site 22

3.02 Description of the Project 22

3.03 Extent of the Work 223.04 Consumer Units and Distribution Boards 22

3.05 Wiring System 22

3.06 Earthing System 22

4.00 PART D: CONTRACT DRAWINGS, BILLS OF QUANTITIES 23

4.01 Contract Drawings 23

4.02 Bills of Quantities D1-D9

6



SUB-CONTRACT PRELIMINARIES AND CONDITIONS

1.00 PART A

1.01 DEFINITIONS

Throughout the sub-contract document units of measurement and

terms are abbreviated and shall be interpreted as follows:

EMPLOYER: ETHIOPIAN ORTHODOX CHURCH

P.O. BOX 48231 00100

NAIROBI

PROJECT MANAGER : GADO CONSULTING ENGINEERS

P.O. BOX 54400

NAIROBI.

ELECTRICAL ENGINEER: SYNCHROCONSULT ASSOCIATES

P.O. Box 79626 00200,

NAIROBI.

CONTRACTOR: The person or persons, partnership, firm or company whose

tender for the main contract works has been accepted and

who has entered into a contract with the employer

SUB-CONTRACT: The term ‘Sub-contract’ whereas used hereinafter and in all

sub-contract documents shall mean the person or persons, partnership, firm or company whose tender for the sub-

contract works has been accepted and who has or have

entered into a sub-contract Agreement with the contractor for

the execution and completion of the sub-contract works and

shall include his or their heirs, executors, administrators,

assigns, successor and duly appointed representative

7



SUB-CONTRACT AGREEMENT: The term Sub-Contract Agreement whereas used

hereinafter and in all the sub-contract documents shall meanthe latest edition of the Agreement and schedule and

Building sub-contract published by the Kenya Association of Building and Civil Engineering Contractors with the sanction

of the East Africa Institute of INTERIOR DESIGNERS as

particularly noted or amended hereafter. For the purpose of

the sub-contract works, the sub-contract Agreement shall be

read and construed together the sub-contract under the terms

of the sub-contract Agreement will be required to indemnify

the contractor against all claims and obligation in respect of

the sub-contract as those for which the contractor is liable in

respect of his contract with the employer.

SITE: The term site wherever used herein after and in all the sub-contract documents shallmean the land or other places in which the sub-contract

documents shall mean the land or other places in which the

sub-contract works are to be executed or carried out and any

other lands or places provided by the employer for the

purposes of the main contract. The sub-contractor should refer

to the main contract specification for detailed description of

the site.

mm: Shall mean millimetres.

M: Shall mean metres.

Kg: Shall mean kilogramme mass.

N: Shall mean Newtons.

B. S: Shall mean the current British Standard Specification

(pertaining to the relevant topic) published by the British

Standards Institutions.

I.E.E. Shall mean the Institute of Electrical Engineers and references

to the I.E.E. Regulations shall mean the 14th Edition of the

Institution of Electrical Engineers wiring Regulations for

Buildings, with the latest amendments.

C.P Shall mean the current British Standard Code of Practice published by the Council for codes of Practice British

Standards Institution.PROVIDE: The term ‘provide’ shall mean the supply, delivery to site of

all necessary materials and labours, installation, testing and

commissioning at site.

SPECIFICATION: The term ‘specification’ shall mean the whole of the sub-

contract document including but no restricted to:-

a) This document comprising sub-contract preliminaries,General specifications and bills of quantities.

b) The contract drawings.

8



BILLS OF QUANTITIES: Where the term ‘Bill of Quantities’ bears any relation to the

Sub-contract it shall mean the specification and priced or other

schedules contained herein.

CONTRACT DRAWINGS: The term ‘Contract Drawings’ shall mean those drawings listedas referred to in and forming part of the specification.

TENDER DRAWINGS: The term ‘Tender Drawings’ shall mean those drawingswhich were enclosed with and formed part of the dub-

contractor’s tender for the sub-contractor works.WORKING DRAWINGS: The term ‘Working Drawings’ shall mean those drawings

required to be prepared by the sub-contractor as hereafter

described.

RECORD DRAWINGS: The term ‘Record Drawings’ shall mean those drawings

required to be prepared by the sub-contractor showing the ‘as

installed’ and other records of the sub-contract works as

hereinafter described.

9



ITEM NO DESCRIPTION KSHS CTS

1.02 IMPORTED FITTINGS AND EQUIPMENT - The sub-contractor is deemed to have taken into

account the need of importation of fittings and equipment. Delay in doing so should not affect

the contract period. The interior designers must be informed of the items to be imported and

must first approve the importation of the same if they are to utilized for this project.

1.03 SUB-CONTRACT AGREEMENT - As defined under definition of terms.

1.04 FIRM PRICE CONTRACT - Unless otherwise specifically stated in the preliminaries, this is a

firm price contract and the sub-contractor must allow in his tender for any increase in the cost

of labour and/or materials during the currency of the sub-contractor. No claim for increased

costs will be entertained accepting only increased costs arising from fluctuations in duties as

defined in condition No 30 of the conditions of contract. No claim will be allowed for currencyfluctuations. All prices shall be Kenya shillings and cents.

1.05 PRIME COST AND PROVISIONAL SUMS - These sums are allowed to cover the cost of special items. All these sums will be omitted from the sub-contractor initially and added only

through instruction by the INTERIOR DESIGNERS or Engineer. Any item detailed to be

supplied out of a provisional sum any be purchased direct by the employer and supplied to the

sub-contractor on a non-basis. Alternatively, the sub-contractor may be asked to purchase such

items direct from the suppliers. If required and instructed by the Engineer, the sub-contractor

nominated by the engineer, to supply and install any equipment covered by provisional sums.

1.06 GUARANTEE - The whole of the work shall be guaranteed for a period of six months form the

date of Engineer’s certificate of completion and under such guarantee the contractor shallremedy at his expense all defects in material and apparatus due to faulty design, construction or

workmanship which may develop in that period.

1.07 STORAGE OF MATERIAL ON SITE - Space for storage will be provided on the site by the

Main Contractor but the Sub-contractor will be responsible for the provision of any lock-up

sheds or stores required.

1.08 PRINCIPAL CONTRACTOR’S LIABILITY - Space for theses shall be as stated in the latest

edition of the Contract Agreement published by the Kenya Association of Building and Civil

Engineering Contractors.1.09 LABOUR - The work shall be executed under the direction and to the entire satisfaction in all

aspects of the interior designers. The working hours shall be those worked by good

employers in the industry.1.10 SUPERVISION - The Sub-contractor shall constantly keep on the site a literate Agent or

Representative competent and experienced in the kind of work involved, who shall give his

whole time to the super-intendance of the Sub-contractor works. Such Agent or Representative

shall receive on behalf of the Sub-contractor directions and instructions from the Contractor and

such directions and instructions shall be deemed to be given to the Sub-contractor in accordance

with the conditions of the Sub-contract agreement.

1.11 FACILITIES FOR INSPECTION - The Engineer shall at all t imes during normal working

hours have access to the Sub-contractor works and to the yards and work-shops of the Sub-

contractors or other places where work is being prepared for the Sub-contract works.

1.12 DISCREPANCIES - The Sub-contractor is not expected to deviate from the specifications and

drawings. Unless expressly permitted to do so by the interior designers in writing. Any

discrepancies which are not approved will be replaced before the works are accepted as

practically complete.1.13 VARIATIONS - Variations which have a financial implication to the Sub-contract will be

priced per the priced schedules. The Sub-contractor must obtain a site instruction signed by the

Engineer and countersigned by the interior designers before additional works are

10



commenced. Where site instructions have a financial implication, the Sub-contractor must

ensure that the interior designers has raised a Variation order for the same.

1.14 ORDERING FOR MATERIALS - All materials used in the execution of the works shall be of

the best quality and description. Any materials for the works condemned by the interior

designers shall immediately be removed and replaced with accepted materials at the site

ITEM NO DESCRIPTION SHS CTS

at the Sub-contractor’s expense. Ordering of materials which are therefore an alternative to the

specified should only be done with the written approval of the interior designers.

1.15 FAULTY WORK OR MATERIAL - The whole of the works shall be carried out to the

satisfaction of the interior designers who shall have the right to reject any material or

workmanship which is in his opinion unsatisfactory and to instruct the Contractor to rectify

such bad workmanship forthwith at Sub-contractor’s expenses. In the event of any undue

delay, the interior designers shall have the right to employ others to supply and deduct the

cost from the contract value. In the case of poor workmanship, the interior designers may

direct that it be done otherwise and the cost thereby incurred shall be recoverable as liquidated

damages in money.

1.16 FINAL ACCOUNT - The final account shall be prepared only at the end of the defects liability period. The final retention money will only be released when the interior designers is

completely satisfied with all the works under the Main Contract unless he expressly approves

separate completion. The Sub-contractor is expected to liaise with the Engineer throughout the

contact term so that undue claims may not arise at Final Account stage.

1.17 VALIDITY OF TENDER - The Tender validity period shall be 90 days from the date of tender

opening. The interior designers may, however, request the Sub-Contractor to extend validity

for a short period if the 90 days expire before acceptance

1.18 EXISTING PROPERTY - Every care shall be exercised by the Sub-contractor to avoid damage

to all existing property. Any damage caused to the existing property during execution of this

Sub-contract will be entirely the responsibility of the sub-contractor and it will be made good

to the satisfaction of the Engineer.1.19 SAMPLES - The Sub-contractor shall furnish at his own cost any sample materials or

workmanship that may be called for by the interior designers for his approval and anyfurther samples in the case of rejection until such samples are approved by the interior designers. The interior designers may reject any materials or workmanship not in his

opinion up to the approved samples.

1.20 SITE CONDITIONS - It will be deemed that the Sub-Contractor visits the site before entering

into the Sub-contract Agreement. It shall further be deemed that he satisfies himself with

regard to access to the site, the risk of injury or damage to the property on or adjacent to the site

or to the occupiers of such property, the supply of labour and materials. It shall be deemed that

these extremities are covered in the pricing and knowledge in this respect.

1.21 MATERIALS, TOOLS, PLANTS - As described under item numbers 1.07, 1.14 and 1.15.1.22 INSURANCE - The Sub-contractor shall take out all insurance policies as required under the

terms of the Sub-contract Agreement clauses 5 and 6.

1.23 CASING UP AND PROTECTION - The Sub-contractor shall be responsible for casing up or

otherwise protecting to the satisfaction of the Engineer all parts of the Sub-contract works liableto damage and for removing such protection and making good at completion.

1.24 DEFECT LIABILITY PERIOD - The defect liability shall be six months from the date of

completion of the Contract as certified by the interior designers.

1.25 BOND -All Tenderers will submit the name of an approved surety who will be willing to be

bound to the main contractor in an amount equal to 10% of the Sub-contract amount as clause

31 of the Sub-contract Agreement.

1.26 DAMAGES FOR DELAY - Liquidated and Ascertained damages as stated in the main

Contract Agreement will be claimed against the main Contractor for any unauthorized delay in

11



completion. The Sub-contractor will be held for the whole or a portion of these damages

should be cause delay in completion.

1.27 CLEAR AWAY ON COMPLETION - The Sub-contractor shall upon completion of the works,

at his own expense remove and clear away all plant equipment, rubbish and unused materials,

and shall leave the whole of the works in a clean and tidy state to the satisfaction of the

interior designers. On completion, the whole of the works shall be delivered up clean,

complete and perfect in every respect to the satisfaction of the interior designers.

1.28 SECURITY -Security on site shall be the responsibility of the Main Contractor as per the

contract Agreement. The Sub-contractor is however expected to lock up his store and be

responsible for all his tools, plant etc.1.29 MEASURED WORK - These will be as per the Main Contract Agreement. All Sub-contract

works are deemed to final measurement when completed to the satisfaction of the interior

designers.


1.30 SETTING OUT - The Sub-contractor shall set out the works in accordance with the dimensions

and levels shown on the contract drawings and shall be responsible of the correctness of all

dimensions and levels so set out by him. He will be required to amend all errors arising from

inaccurate setting out at his own cost and expenses. In the event any error or discrepancies

must be reported by the Contractor to the interior designers for his immediate consideration.

1.30A TAXES AND DUTY - The Sub-contractor shall be required to pay import duty on all items of

equipment, fittings, plant, whether imported or locally manufactured. Provision should beallowed for Value Added Tax at the prevailing Government rate and the VAT will have to be

inbuilt in the rates and is not to done separately.

12




1.31 FAIR WAGES - These shall be as clause 30 of the sub-contract Agreement.

1.32 GOVERNMENT ORDINANCE AND REGULATIONS - Provisions of the FactoriesOrdinance 1950, Regulations of the Electrical Equipment of Buildings, relevant British

Standards and Codes of Practice and current Government regulations must be complied with by

the Sub-contractor and allowance must be made by him in his Tender. The Sub-contractor shall

obtain from the relevant authority fullest information regarding all such regulations at his own

expense and no claim for want of knowledge in this connection will be entertained.

1.33 SCOPE OF CONTRACT - It will be deemed that the Sub-Contractor allowed in the Sub-

contract sum for everything necessary for the proper and satisfactory execution to completion of

the works in accordance with the specification and Contract Drawings taken together and to theapproval of the Engineer. Any claims based upon qualifications included in any document

introduced by the Sub-contractor to accompany his tender will not be entertained.

The bonus for discovering any differences that may exist between the Contract Drawings and

the text of the specification shall be taken to rest with the Sub-contractor. Any such differences

should be brought to the attention of the Engineer for clarification before tenders are returned

for opening. It shall be deemed that no such discrepancy exist or that the Sub-contractor has

priced for them in the document should he not seek the clarification as stated.

Should any difference be found between the Contract Drawings and the Specification after

submission of the tender, the engineer will at his absolute discretion and without prejudice tothe employer decide the procedure to be followed and no claim based upon the Engineer’s

decision will be entertained.

It will be deemed that the Sub-contractor prior to submitting his tender for the executing and

completion of the Sub-contract works obtained all particulars, information, clarification and

explanation from the Engineer for complete and correct preparation of the tender. No claim

based on lack of knowledge in these respects will be entertained.1.34 HOISTING - This shall be as clause 25 of the Sub-contractor Agreement

In addition all casing, cutting and making good Builder’s works will be done by the Main-

Contractor after markings done by the Sub-contractor.

1.35 DURATION OF THE CONTRACT - This will be in keeping with the Main Contractor period.

1.36 DOCUMENTS TO BE CHECKED - It shall be deemed that all tender documents have beenfully checked by the Sub-contractor. The interior designers may disqualify any tender which in

his opinion has incorrect and insufficient documents.1.37 WATER, ELECTRICITY, TELEPHONE - These will be availed by the Main Contractor. The

Sub-contractor shall be liable for the cost of any services provided by the Main Contractor for

their own use, as stated in the Main Contract Agreement.

Total carried forward to price summary page : …………………………………………………………………

……………………………………………………………………………………………………………………….

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Signed (as in Tender) ………………………………………………………………………………………………..

………………………………………………………………………………………………………………………...

Date : …………………………………………………………………………………………………………………

Stamp : ……………………………………………………………………………………………………………….

2.00 PART B - GENERAL SPECIFICATIONS FOR ELECTRICAL WORK

2.01 REGULATIONS AND STANDARDS APPLICABLE

The Sub-contractor works shall comply with the provisions of the following documents:-

1. General conditions of contract for sub-contract works.

2. Government Electrical specification Number 1.3. Government Electrical specification Number 2.

4. Electrical Power Act and the rules made thereunder.

5. The current edition of the ‘Regulations for the Electrical Equipment of Buildings’ issued

by the Institution of Electrical Engineers of Great Britain (with Kenya Amendment).

6. Kenya Power and Lighting Company Ltd. By-laws.

The Sub-contract shall comply with all the requirements of the Kenya Power and lighting

Company Ltd. and Kenya Posts and Telecommunication.

2.02 SCOPE - The Sub-contractor shall supply all materials and install, fix, connect, test, label,commission and deliver the electrical work, clean , complete and working in every detail as

described elsewhere in the specifications and any related specifications and drawings listed in

the schedule of drawings and to the satisfaction of the interior designers.

2.03 AS INSTALLED DRAWINGS - On completion of the work to be carried out under this

contract the electrical sub-contractor shall submit to the interior designers record or ‘As

installed drawings’. These shall be reproduced in the form of a negative (preferably plastic

film) from the original contract drawings which the contractor shall bring up to date with anyalteration made during the progress of the work. The size and scale of any drawing shallgenerally be the same as the original contract drawing unless otherwise specified by the interior

designers. On completion of the drawing they shall be endorsed as a true record of the

installation and signed by the Contractor.

The Contract will not be considered complete until ‘As installed’ drawings have been produced

and accepted by the INTERIOR DESIGNERS.

2.04 CONTRACT DRAWINGS - The contract shall be based on the drawings listed in the schedule

of the Drawings given elsewhere in this specification.

It should be noted that the contract drawings do not purport to show every detail and the

Electrical Sub-contractor shall allow for all the fittings, fixing, accessories, etc., normally

provided and required to form a complete and working installation where not specificallyshown on the tender drawings or mentioned in this specification. No deviations shall be made

form the contract drawings unless with written approval from the interior designers. Any suchdeviations will be rectified at the expense of the Contractor.

2.05 WORKING DRAWING - The Sub-contractor shall prepare working drawings as may be

necessary for the proper execution of the works including conduit layouts, switch-gear

arrangements and cable routing. Three prints of working drawings must be submitted to the

Engineer before commencement of work. One set will be signed by the Engineer and returned

for use by the Sub-contractor. The other set will be returned to the contractor and other Sub-contractors, to ensure that other services are not interfered with. In preparing working

drawings, the Sub-contractor is expected to liase closely with other contractors and allow of

their services. Alterations which may later arise due to lack of liaison will be at the Sub-

14



contractor’s expense.

2.06 MATERIALS - All materials required for completion of the Sub-contract works must be

supplied by the electrical Sub-contractor unless stated otherwise these materials must confirm

to both the specifications and the contract drawings.

The manufacturer’s catalogue numbers and trade names are quoted only as a guide to the type

and standard of equipment required. Equipment, similar type and standard may be used subject

to the prior approval of the interior designers in writing.2.07 LABELS - All switchgears, distribution boards, etc., shall be clearly and properly labelled in

accordance with clause 32 of GES no 1 Fuseways and circuit breakers feeding final sub-circuits

shall be labelled to show whether light or power etc. the area served and the circuit number as

given by the contract drawing. This shall be done by writing neatly on the label normally

provided with a ball-pen (not a pencil or felt tip) If no label is provided, the Sub-contractor shall

fix a specially made label of the ‘Traffolyte’ tape (Dynotape will not be accepted).

2.08 GALVANIZING - Galvanizing shall be applied by the process and shall consist of a smooth

clear zinc coating free from defects and be in uniform thickness. The thickness shall not be less

than 610gms of zinc per square meter of surface and tested in accordance with the requirements

of B.S. 729 where applicable. Sherardise or other alternative processes shall not be used

without approval in writing of the Engineer. The preparation for galvanizing and the

galvanizing itself shall not adversely affect the mechanical properties of the coated material.

Surfaces which are normally in contact with oil shall not be galvanized or cadmium plated. Allout-door structures, access ladders, platforms, equipment cubicles shall be galvanized.

2.09 CLEANING AND PAINTING - All equipment shall be cleaned of all dust, oil grease, dirt scale

and rust by power tool operated metal brush or preferably by shot or grit blasting and then

ground smooth where necessary.

Unless otherwise approved, they shall then immediately have applied to them two coats of

approved primer paint. After inspection, any rough surfaces shall be fitted in an smoothed over

and further painting done.

2.10 FIRE PRECAUTIONS - It shall be deemed that the sub-contractor has taken precautionsagainst fire inclusive of insurance cover as per the sub-contract Agreement clause 6.

2.11 RADIO INTERFERENCE - It shall be deemed that the sub-contractor has taken into account

protection against radio interference in installation where stated elsewhere.

2.12 PADLOCKS - The sub-contractor is expected to use approved padlocks to ensure safety of his

store and materials stored therein.

2.13 TOOLS - These should be as described in PART A clause 1.21.

2.14 EXPANSION JOINT - Adequate allowance shall be made for longitudinal expansion andcontraction of conduit under normal working temperature variations.

2.15 MV SWITCHBOARD AND SWITCHGEAR - Main switchboards shall either be of the cubicle

type (e.g. as English Electric Miniform) or of the composite type having a bus-bar chamber and

switchfuses of the MEM type as shown on the contract drawings. They shall have a separate

chamber(s) to install K P & L Co. Ltd incoming service cable, current transformer, meters and

all other such equipment. Ammeters, Voltmeters and other instruments shall be installed where

specified. Before constructing any type of main switchboard sub-main switchboard or

distribution centre, the sub-contractor shall submit for the approval of the interior designers a

fully dimensioned layout drawing. Any switchboard installed without the approval of the

interior designers may have to be removed. All switchboards supplied to the site shall be

complete with all necessary fuses, plugs connections support brackets, etc.2.16 CIRCUIT BREAKERS - These shall be manufactured to B.S. 3871 and of a rating as specified

on the drawings. The circuit breakers shall incorporate both thermal overload and magneticshort circuit tripping, with a trip free-mechanism. Three phase circuits shall be controlled by

integrally manufactured three pole breakers with one common operating lever. An inter-

tripping mechanism shall ensure isolation of all three poles in the event of an overload or short

circuit of any one phase.

2.17 FUSE - SWITCHES - These should be of modern compact design with a performance service,

safety and maintenance features to suit the requirements of low voltage a.c. system . Theyshould meet the requirements of B.S. 5419 with latest amendments and I.E C408 which implies

that they should accept fuse links of appropriate rating to B.S. 88. They should in addition meet

the extra requirements necessary for motor isolating switches.

15



Only those manufactured by ottermill, MEM Bill, English Electric or equally approved by the

Engineer are to be used.

2.18 EARTHING AND BONDING - Earth electrodes shall be minimum 1.4 metres long by 12mm

diameter hard copper rod, and shall be located not less than 3m apart at a convenient position

6m away from the building. The terminal head of each electrode shall be in a concrete

inspection pit, with cover. If the resistance to earth is not satisfactory with one electrode then

additional electrodes or an earth mat shall be provided as directed by the Engineer. All water pipes, hand-wash basins and exposed metal works must be bonded to earth as per the I.E.E.

regulations.

2.19 NEUTRAL BARS - All switchgear must be equipped with neutral bus-bars to which the service

cable neutrals will be bolted. The neutral bus-bars will be of similar size to the other bus-bars.

All distribution boards will have integral neutral bus-bars with screwed outlets per individual

circuits.2.20 SWITCH FUSES - These are to conform to BS5861, BS5419 and IEC408. In addition they

shall conform to all aspects as fuse switches i.e. clause 2.17.

2.21 DISTRIBUTION BOARDS - Lighting and power distribution boards shall comply with

B.S.3817, BS5861 and BS214 and shall be of the metal clad pattern flush mounted, except

where otherwise stated on the contract drawings.

Each board shall be fitted with an engraved identification label in black and white, such as

‘Distribution Board D.I’ etc., and all three phase boards shall be labelled in white or red,‘DANGER 415 VOLTS’.

2.22 CONSUMER UNITS - Consumer units are to conform to BS381c. They are to have bus-bars

and be able to carry miniature circuit breakers. They must be as crabtree Dorman Smith MK or

equal and approved by the Engineer.

2.23 LABELLING OF SWITCHGEAR AND DISTRIBUTION BOARDS - These are to be as

clause 2.07

2.3.01 P.V.C. I CABLES - All power and lighting wiring cables shall be 600/1000 volt grades singlecore, PVC insulated, with stranded copper conductors, manufactured in accordance withBS6006. The minimum size on lighting circuits shall be 1.5 sq mm, 4.0sqmm on power spur

circuits and 2.5sqmm on ring mains circuits.

The wiring shall be carried out on the looping-in principle. All joints shall be made at the

terminals of main switches, distribution boards ceiling roses, switches and socket outlets, etc.,

and fixed apparatus only.

2.3.02 PVC/SWA/PVC CABLES - These shall be 600/1000 volt grade to BS6346 or BS6004 having

copper conductors of plain copper wire PVC insulated, PVC sheathed, single wire armoured

and PVC sheathed overall, the cores of four core cables shall be distinctively coloured red,

yellow, blue and black. The sub-contractor shall provide suitable glands and accessories for allarmoured cable terminations and where cables are suspended shall provide the necessary cable

trays, racks, cleats or hanger supports and fixings.

Cables supports and racks shall be made by a recognised manufacturer and shall be to the

approval of the interior designers. All supports and racks shall be arranged as far as is

practicable for the easy removal of any single cable in a multi-cable run without threading

cables through supports and racks. The number of types of support and racks shall be kept to a

minimum commensurate with meeting the requirements of the contract works.2.3.03 MINERAL INSULATED CABLES

2.4.00 WIRING SYSTEMS

2.4.01 METHOD OF WIRING - The system of wiring shall be as specified in particular specification

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contract drawing.

2.4.02 SYSTEM A - CABLES ENCLOSED IN CONCEALED STEEL SCREWED CONDUIT OR

TRUNKING - The wiring shall be carried out in approval type of single core, plastic insulated

cable, enclosed in steel screwed conduit or trunking mechanically and electrically continuous

throughout. Conduit shall be buried in the wall and floors of the buildings, and either run in

roof space or buried in structural slabs.

2.4.03 SYSTEM B - CABLES ENCLOSED IN STEEL SCREWED CONDUIT OR TRUNKINGFIXED TO THE SURFACE OF WALLS AND CEILINGS - The wiring shall be carried out in

an approved type of single core, plastic cable enclosed in steel screwed conduit or trunking

mechanically electrically continuos throughout conduit and trunking shall be run on the

surfaces of the walls and ceilings, or in false ceiling spaces. Conduit shall be secured in

position by means of spacer bars saddles. Conduit shall be run horizontally on the walls or

vertically to switches or outlets.

2.4.04 SYSTEM C - PVC INSULATED CABLES WITH INSULATED EARTH CONTINUITY

CONDUCTOR ENCLOSED IN CONCEALED NON-METALLIC CONDUIT OR

TRUNKING - Wiring shall be carried out in an approved type single core, plastic insulated

cable with earth continuity conductor enclosed in high impact, heavy gauge, non-metallicconduit or trunking conduit shall be buried in the walls and floors of buildings and either run in

roof space or buried in structural slabs.

2.4.05 SYSTEM D - PVC INSULATED CABLES WITH INSULATED EARTH CONTINUITY

CONDUCTOR ENCLOSED IN NON-METALLIC CONDUIT OR TRUNKING FIXED TO

THE SURFACE OF WALLS AND CEILINGS - Wiring shall be carried out in approved tape

single core plastic insulated cable with earth continuity conductor enclosed in high, impact,

heavy gauge, non-metallic conduit or trunking conduit and trunking shall be run on the surface

of the walls and ceilings or in false ceiling spaces. Conduit shall be secured in position bymeans of space bar saddles. Conduit shall be run horizontally on the walls or vertically to

switches or outlets.

2.4.06 SYSTEM E - MINERAL INSULATED COPPER SHEATHED CABLES - The wiring shall

be carried out in single core or multi-core mineral insulated copper sheathed cables run on the

surface of walls and ceilings in the roof space or concealed in walls and floors.

2.4.07 STEEL CONDUIT - Not more than four easy sets, or two right angle bends or sets may be

installed between draw-in points. Solid elbows or trees shall not be accepted. Where surfaceconduits are authorised for use, they shall be of the welded heavy gauge steel class B to BritishStandard Specifications B.S.31. No conduits shall be smaller than 20mm diameter. They shall

be electrically and in all cases mechanically continuous throughout. Conduits installed inside

buildings, shall be black enameled finish except where specified otherwise. Conduits installed

outside environment shall be of galvanised finish. All fittings and accessories, such as conduit

boxes, etc., to be used in conjunction with galvanised conduits shall also be galvanised.

Conduits shall be fixed to give not less than 6,, clearances between the conduits and the walls or

other surfaces where they are fixed. Conduits fixing points shall generally not exceed 1200mm

spacing for 20 and 25mm diameter conduits and 1500mm for larger conduits.

Conduits shall be kept at least 150mm clear of steam and hot water pipes and preferably run below the pipes. Where conduits run adjacent to cold water pipes, bell clock or telephone

circuits they shall be kept at 150mm or prevented by spacing or insulation, from coming intocontact with these services. Where there is a possibility of moisture collecting in the conduit a

drain hole of 5mm diameter shall be drilled at the lowest point of the conduit run or box, or

other points as directed by the interior designers and shall be fitted with a suitable drain plug.

Steel work shall not be drilled for fixing of conduits or accessories except where authorised in

writing by the interior designers. Such authorisation shall be limited to the drilling of 3mmholes for hardened self-tapping screws and shall not normally be given when more than two

conduits follow the same route. Conduits and accessories may be fixed to steelwork by means

of purpose made bracket and grader fittings. Details of such brackets or clamps shall be

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submitted to the interior designers for approval before being used. Where conduit runs enter

specified areas requiring flame proof equipment barrier boxes shall be inserted immediately

before conduit enters the flame proof area. All conduits and accessories installed within this

area shall be solid drawn galvanised and Buxton certified as suitable for Group 11 hazards.

Equipments shall comply with BS229, BS889 and code of practice CP1003 conduit installed

and buried in walls shall allow a minimum of 10mm cover. These conduits and those cast ‘in

site’ in concrete slabs shall be given one coat of rust prevention paint before installation of conduits and before concrete is poured.

where buried in the ground outside the building the whole of the buried conduit shall be painted

with two coats of approved bitumastic composition before covering up. Where run on the

surface, conduits and accessories shall be painted with two coats of oil bound enamel applied to

rust and grease free metal work.

2.4.08 STEEL TRUNKING - Metal trunking shall be fabricated from mild sheet steel of not less than

18swg and shall have stove enameled finish. All sections of trunking shall be rigidly fixed

together and attached to the framework of fabric of the building at intervals of not less than1200mm. Joints in trunking shall not overhang fixing points by more than 600mm. All

trunking shall be made electrically continuous by means of 25mm x 3mm copper links across

each joint in the system. Connection shall be made by means of electro-tinned bolts (head

inside trough) nuts (6mm diameter minimum) flat washers and spring washers. Where the

trunking is galvanised the galvanising shall be removed within 6mm of the jointing strap, and

the area painted. They shall also be mechanically continuous by being jointed with purpose

made through elbow tee or cross box. All trunking fittings (i.e. bends, tees, etc.) shall leave the

main trough completely clear of obstruction and continuously open except through walls andfloors, at which points suitable fire resisting barriers shall be provided as may be necessary.

Where trunking passes through ceilings and walls the cover shall be solidly fixed 150mm either

side of ceilings and floors and 100mm either side of walls.

Screws and bolts securing covers to trunking, sections of cover together shall be arranged sothat damage to cables cannot occur either when fixing covers or when installing cables in thetrough.

When trunking is used to connect switchgear of fuse-boards such connections hall be made by

trunking fittings manufactured for this purpose and not by multiple conduit couplings. Where

vertical section of trunking are used which exceed 900mm in length, staggered tie, off points

shall be provided at 900mm intervals to support the weight of cables.

All trunking systems shall be painted as for conduit.

Where a wiring system incorporated galvanised conduit and trunking, the trunking shall bedeemed to be galvanished unless specified otherwise.

Cables following the same route shall be found together in groups of not more than 6 cables.

The bindings shall comprise fine strip cords and shall be applied at intervals of not more than

600mm along the run of cable.

The number of cables to be installed in trunking shall be such as to permit easy drawing in

without damage to the cables and shall in no circumstances be such that a space factor of 45%is exceeded.

Conduits shall be terminated at the trunking with a coupling and made bush, passing through a

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neat clearance hole. Oversized hole and washers shall not be used. All conduits terminating at

the trunking shall be bonded together and to the trunking but the trunking shall not form part of

the earth continuity conductor.

2.4.09 NON-METALLIC CONDUIT - All non-metallic conduit shall be class ‘A’ heavy gauge, high

impact, PVC complying with BS4606 part 2, type AH.

The minimum size to be used is 20mm external diameter. All conduit installations shall beconcealed in the walls and floors or in structural slabs.

2.4.10 FLEXIBLE CONDUIT - These are to be used as final connections to motors and other fixed

appliances where vibration is prevalent.

Flexible metallic conduit shall comply in all respects with BS731 part 1. Flexible non-metallic

conduit shall comply with BS4607 part 3. Flexible metal conduit shall not be used as the solemeans of providing earth continuity, and a separate earth-continuity conductor complying with

the appropriate requirements shall be provided for every part of a system formed by suchconduit.

2.4.1 1 CABLE TRAYS:

These are to be galvanised and constructed as per the relevant British Standard Specifications.

They are to be supported to the wall at 1M intervals.

2.5.00 SOCKET OUTLETS:

In all areas, general power outlets shall be of the 13 amp 3 pin plug type complying with

BS1363. They shall be flush pattern with white or ivory cover plates unless otherwise specified

on the drawings. Where the circuits are supplied from a common feed, two outlets shall formtwin unit in a common box. The earthing terminal of every socket outlet shall be connected to

the earth continuity conductor of the final sub-conductor. Unless otherwise stated they shall be

mounted at 300 mm above finished floor level.

One fused plug top shall be supplied for each socket outlet installed. Fuses shall be 13 amp

unless otherwise specified.

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2.6.00 FUSED CONNECTION UNITS

2.6.01 GENERAL

All fused connection units shall be 13 amp with fuse and neon indicator lamp. Boxes shall be

flush type with white or ivory cover plates and shall be switch type unless otherwise specified

on the drawings.

2.6.02 FUSES

All fused connection units shall be fitted with 13 amp fuses, unless otherwise specified.

2.6.03 LABELLING

The front plate of each fused connection unit shall, unless otherwise specified, be engraved with

he name of the appliance connected to it.

2.7.00 LIGHTING SWITCHES

TYPELighting switches shall be of the all-insulated rocker-operating plate-switch type to B53676 of ample rating. Switch inserts shall be white, set in white or ivory cover plates.

Switches controlling points in bathroom shall be placed outside the bathroom or consist of a

ceiling with operated by a non-conducting cord as specified. Switches mounted outdoor shall

be of weathertight pattern.

Switches shall be one way, two-way or intermediate as specified and where a number of

switches are mounted together, they shall be fitted in a common box.

Ceiling switches shall be white or ivory semi-recessed pattern, and shall only be used wherespecified. Pull cords shall be fitted with shock absorbing springs.

2.8.00 CEILING ROSES2.8.01 TYPE

Ceiling roses, ivory or white, shall be of the 3-plate pattern and fitted at all pendant points. An

earthing terminal shall be provided and connected to the earth continuity conductor of the final

sub-circuit where applicable.

Ceiling roses of the white porcelain semi-recessed pattern shall be used for surface installation,and shall be of the all-insulated type for a flush installation.

2.9.00 LAMPHOLDERS

2.9.01 TYPE

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Lampholders shall generally be of plastic construction with porcelain interiors and bayonet

fitting.

Lampholders for lamps rated 200 watts and above shall be of the Edison Screw Type.

Batten type Lampholders shall be of the all-insulated bayonet type.

Batten type lampholders shall be of the all-insulated bayonet type.

2.10.00 LIGHTING FITTING

2.10.01 GENERAL

The sub-contractor shall supply and fit all lighting fittings of the type indicated on the drawings

and in the schedules. All fittings shall be suitable for operation on a 240 v 50 cycle supply.Lighting fittings rated other than 240 v will not be accepted. All lighting fittings shall be

supplied with lamps.

2.10.02 FLUORESCENT FITTINGS

Fluorescent fittings shall generally be of the batten type, with control gear contained within the

supporting channel. All fittings shall be supported from conduit boxes, and shall be suspended

by two 20mm conduits to give a clearance of 25mm between the top of the fitting and the

ceiling. In the ceiling, the conduit boxes, to BS31, shall be fitted with dome covers, to which

the suspension conduits shall be joined, so that the lighting fitting hangs vertically below the

conduit boxes. Fittings shall comply with BS3820 or class 1 indoor normal atmospheres.

All fluorescent fittings shall be fitted with radio interferance suppression capacitors and power

factor correction capacitors and shall be earthed.

2.10.03 REFLECTORS

All reflectors for fluorescent fittings shall be made of sheet metal suitably shaped and stiffened,

and shall be of white enamel finish.2.10.04 LAMPS

All fittings shall be supplied complete with lamps of the type and rating specified. Fluorescent

tubes shall be of the white type, except where otherwise stated. Pearly type tungsten lamps

shall be fitted in open fittings.

2.11.00 FLEXIBLE CORDS

2.11.01 TYPE

These shall be 250 volt grade PVC insulated and shall comply with BS7. Flexible cords shall

not be less than 24/20 (23/0076). Flexible cords for pendant fittings shall be circular type, heat

resistant white in colour.2.12.00 EARTHING

2.12.01 Earth electrodes shall be minimum 1.4m long by 12mm diameter hard drawn copper rod, andshall be located not less than 3 apart at a convenient position 6m away from the building. The

terminal head of each electrode shall be in a concrete inspection pit, with cover. If the

resistance to earth is not satisfactory with one electrode, then additional electrodes or earth mat

shall be provide, as directed by the Engineer.

2.12.02 DISTRIBUTION SYSTEM EARTHING

All distribution boards shall be earthed in accordance with the I.E.E. regulations. All metal

work associated with the installation shall be earthed to comply with the regulations currently in

force.

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2.12.03 TESTING OF EARTHING SYSTEM

The resistance of the earth continuity system, when measured between the main earthing point

and any other point in the installation, including all conduit and other metal work which may

provide a path or earth, shall not exceed 0.5 ohm, where steel conduit forms part or the whole

of the system, or 1.0 ohm if the earth continuity system is composed entirely of copper, copper

alloy or aluminum.

When the installation is complete, the Sub-contractor shall carry out tests for earth loop

impendance, polarity, insulation resistance, ring circuit continuity and earth electrode

resistance, in the presence of, and to the satisfaction of Engineer and the E.A.P & L Co. The

Sub-contractor shall rectify all work not giving test results within the limits prescribed.

Four copies of all test results shall be forwarded to the Engineer and a Certificate of completion

will not be issued until such test have been approved.

2.13.00 P M E SYSTEM

Provision shall be made for the P M E System at supply intake where applicable).

“P M E” means that system whereby the neutral conductor of the supply network is earthed at a

prescribed number of point along its routes, together with the installation earth continuity

conductor, at each consumer’s installation so providing a metallic path for the flow of earthfault currents. The connections between the neutral conductor of the supply network and the

earth continuity conductor of the installation shall be made by the Supply Authority at the point

of intake only. The connection at the isolators will be made by the sub-contractor in the

presence of the Engineer after completion of all tests.

2.14.00 COMMISSIONING

The whole installation shall be tested to the statutory requirements of the Electricity Authority,I E E Regulations and commissioned in the presence of and to the satisfaction of the Engineer.

Four copies of the test reports shall be provided within seven days of carrying out the test, and

the reports shall include full details of how each test was carried out, and copy of all readings

taken.

PART C - PARTICULAR SPECIFICATION

3.01 LOCATION OF THE SITE

The site is located at Kilimani in Nariobi

3.02 DESCRIPTION OF THE PROJECT

The Project comprises of demolition of existing partitions and construction of a co-operative

center as the drawings comprising of new partitioning, electrical, air conditioning, structural

cabling and plumbing and drainage works

3.03 EXTENT OF WORK

The sub-Contractor is expected to carry out the purchase and installation of electrical

accessories i.e. conduits cables lighting fittings etc. do the installation commissioning and

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testing.

The subcontractor is to apply to KPLC for power connection and do the necessary attendance in

addition to supplying all the certificates as required by KPLC and ensure energisation of the

completed installations.

3.04 CONSUMER UNITS AND DISTRIBUTION BOARDS

This shall be as per clause 2.21 and 2.22 of part B of the specification.

3.05 WIRING SYSTEM

This shall be system, C clause 2.4.04 of part B of the specification.

3.06 EARTHING SYSTEM

Earthing to clause 2.12 of part B. It shall be expected that the subcontractor will provide the

right readings and to have priced for provision of extra earth electrodes to achieve correctreadings if required.

4.0 CONTRACT DRAWINGS

4.01 CONTRACT DRAWINGS

SCA/2005/13/EO1 - electrical installations for church hall

SCA/02005/13/EO2 - schematic and legend

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PART D

BILLS OF QUANTITIES

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