instrumentation cables

Instrumentation Cable Solutions

Last Revision Date: August 2005 of 21

Contents Introduction - Oman Cables Industry (SAOG)........................................................................................... 3

Quality Standards................................................................................................................................. 3 Instrumentation Cables......................................................................................................................... 3

Mutipair Instrumentation Cables............................................................................................................... 4 BS5308 Part 1 Polyethylene Insulated ................................................................................................. 4

Construction ..................................................................................................................................... 4 Electrical Characteristics .................................................................................................................. 5 BS5308 Part 1 – Collectively Screened, Unarmored Type-1 Cables................................................. 6 BS5308 Part 1 – Collectively Screened, Armored Type–2 Cables. ................................................... 7 BS5308 Part 1 – Individually & Collectively Screened, Unarmored Type – 1 Cables. ....................... 8 BS5308 Part 1 – Individually & Collectively Screened, Armored Type – 2 Cables. ........................... 9

Multicore Instrumentation Cables ........................................................................................................... 10 BS5308 Part 2 PVC Insulated (300/500V) .......................................................................................... 10

Construction ................................................................................................................................... 10 Electrical Characteristics ................................................................................................................ 10 BS5308 Part 2 – Collectively Screened, Unarmored Type –1 Cables ............................................. 11 BS5308 Part 2 – Collectively Screened, Armored Type–2 Cables .................................................. 12 BS5308 Part 2 – Individually & Collectively Screened, Unarmored Type – 1 Cables ...................... 13 BS5308 Part 1 – Individually & Collectively Screened, Armored Type – 2 Cables .......................... 14 BS5308 Part 2 – Collectively screened Unarmoured – Type 1 Cables............................................ 15 BS5308 Part 2 – Collectively screened Armoured – Type 2 Cables................................................ 16

Cable Construction and Characteristics.................................................................................................. 17 Insulation Materials ............................................................................................................................ 17 Core/Pair Identification ....................................................................................................................... 17

Multipair Cables.............................................................................................................................. 17 Cable Assembly ................................................................................................................................. 17 Communications Core or Pair............................................................................................................. 18 Electrical Screening............................................................................................................................ 18 Armouring/Mechanical Protection....................................................................................................... 18

Galvanised Steel Wire Armour........................................................................................................ 18 Non-Metallic Sheaths ......................................................................................................................... 18

Inner Sheath/Bedding..................................................................................................................... 18 Outer Sheath .................................................................................................................................. 18

Appendix 1 ............................................................................................................................................. 20 Colour Coding .................................................................................................................................... 20

As per BS 5308 Part 1.................................................................................................................... 20 Colour Coding .................................................................................................................................... 21

As per BS5308 Part 2..................................................................................................................... 21



Introduction - Oman Cables Industry (SAOG) OCI develops, manufactures and markets a totally integrated product line of instrumentation cables for a diverse variety if technological applications. Oman Cables Industry (SAOG) was formed in 1984 by the current Chairman, Mr. Mustafa bin Mukhtar, Vice Chairman and managing Director, Mr. Hussain bin Salman. Located in Rusayl, the Sultanates largest industrial complex, the company has grown by turnover into one of the top ten industrial companies in Oman. Starting with a modest number of 10 employees, Oman Cables has now over 300 dedicated personnel. Oman Cables has won His Majesty Sultan Qaboos’s Trophy for best industry 4 times in 1991, 1992,1996 and 1997. The company is judged on many criteria including quality, Omanisation, exports, training, safety, use of local materials, sales turnover, financial strength and other important factors. In September 1997, Oman Cables attracted the attention of Draka Holding N.V. of the Netherlands and became an affiliated member of the Draka Holding group following a 34% financial participation by Draka. As an affiliate of the Draka Holding organization with operations in Europe, the United States and the Far East, OCI is ideally positioned to service customers on both a national and a global scale. The OCI offer combines unrivaled experience and a vast product range, developed organically at the leading edge of technology, with the support, strength and the resources of one of the worlds most significant cable companies. OCI is driven by a central philosophy based upon three key issues - PARTNERSHIP, INNOVATION and QUALITY. OCI aims at a maximum understanding of customer requirements for technical specifications through to service and reliability. Quality Standards OCI holds several important international approvals and manufactures it's products in accordance with the relevant IEC, CENELEC and British Standards specifications. The OCI quality system is approved by TUV of Germany to ISO 9001.

Instrumentation Cables The variety of Instrumentation cables is vast with very few countries having national Standards covering this area. The uk is one exception where the British Standard BS5308 Parts 1 and 2 cover the requirements for muliticore and multipair instrumentation cables with PVC or polyethylene insulation and with various forms of mechanical protection. Even with the existence of a National Standard, our experience is that customers still require variants from the use of different core identification schemes to intermediate pair configurations to materials with enhanced characteristics for a particular environment. In this brochure we give details of the more commonly used types. OCI prides itself on its ability to offer products to each customer’s specific needs quickly, efficiently and with an assurance of product quality. The standard range includes multicore and multipair copper conductor instrumentation cables.



Mutipair Instrumentation Cables BS5308 Part 1 Polyethylene Insulated 300/500V Construction Constructors Plain annealed copper conductors complying with BS6360

Insulation Polyethylene type 03 to BS 6234

Pairing Two insulated conductors uniformly twisted together with a lay length not exceeding 100mm

Pair identification

Individual Pair Screened Cables

COLLECTIVELY SCREENED CABLES - Colour coded in accordance with Appendix 1 or by numbered tape.

One blue core and one black core in each pair. Pairs are identified by a numbered pair screen isolation tape or colour coded as per appendix-1.

Pair Screens An aluminum / polyester tape applied with a metallic side down in continuous electrical conduct with a 0.5mm2 tinned copper drain wire. An isolation tape is applied over the screen tape.

Cable Assembly Pairs are assembled in concentric layers using the reciprocating lay technique

Binder A non-hygroscopic binder tape is applied over the final lair of pairs.

Collective Screen An aluminum / polyester tape is applied with the metallic side down in continuous electrical conduct with a 0.5mm2 tinned copper drain wire over the binder tape.

Outer Protection TYPE 1 Extruded PVC sheath of type TM1 TYPE 2 Extruded polyethylene bedding of type 2C or type 03 black Galvanized steel wire Armour Extruded PVC sheath type TM1

Standard sheath colour Black

IMPORTANT NOTICE. THESE CABLES ARE NOT FOR DIRECT CONNECTION TO THE PUBLIC MAINS ELECTRICAL SUPPLY



Electrical Characteristics

Conductor Size

Unit of measure

ment 0.5mm2

1/0.8mm 0.5mm2

16/0.2mm 1.00mm2

1/1.13mm 1.5mm2

7/0.53mm a. Cables with only collective

screen (excl. one pair and two pair [quad])

pF/m 75 75 75 85

b. One pair and two pair cables with collective screened and all cables with individually screened pairs

pF/m 115 115 115 115

L/R ratio (max) mH/ohm 25 25 25 40

Max. Conductor Resistance (D. C.) at 20oC Ohms 36.8 39.7 18.4 12.3

Insulation resistance (min) a. Core to Core / Screen / Armour

for 1km at 20oC G.Ω 5 5 5 5

b. Screen to Screen for 1km at 20oC M.Ω 1 1 1 1

Rated voltage 300/500 volt Test voltage 1000 volt.

Conductor Nominal Area (mm²)

Nom. Insulation Thickness (mm)

Maximum Core Diameter (mm)

0.5 (1/0.8) 0.50 1.90 0.5 (16/0.2) 0.50 2.35 1.0 (1/1.13) 0.60 2.45 1.5 (7/0.53) 0.60 3.00

Combiline machine



BS5308 Part 1 – Collectively Screened, Unarmored Type-1 Cables Multipair Polyethylene insulated without Individual pair screens but collectively screened.

TABLE-1

Conductor size Number of Pairs Thickness of Sheath Nominal Overall Diameter

mm² mm mm 1 0.8 6.3

2 (Quad) 0.8 7.1 5 1.1 11.6 10 1.2 15.0 15 1.2 17.1 20 1.3 19.4 30 1.3 23.0

0.50 ( 1/ 0.8)

50 1.5 28.9 1 0.8 7.0

2 (Quad) 0.8 7.9 5 1.1 13.1 10 1.2 17.2 15 1.3 19.8 20 1.3 22.3 30 1.5 26.9

0.50 ( 16/ 0.2)

50 1.7 33.9 1 0.8 7.4

2 (Quad) 0.8 8.4 5 1.2 14.2 10 1.2 18.4 15 1.3 21.3 20 1.5 24.4 30 1.5 29.0

1.0 (1/1.13)

50 2.0 37.3 1 0.8 8.3

2 (Quad) 0.9 9.7 5 1.2 16.4 10 1.3 21.6 15 1.5 25.2 20 1.5 28.5 30 1.7 34.3

1.5 (7/0.53)

50 2.0 43.6



BS5308 Part 1 – Collectively Screened, Armored Type–2 Cables. Multipair Polyethylene insulated without Individual pair screens but collectively screened

TABLE-2

Conductor size

Number of Pairs

Thickness of Bedding

Size of Armour wire

Thickness of Sheath

Nominal Overall Diameter

mm² mm mm mm mm 1 0.8 0.9 1.3 10.7

2 (Quad) 0.8 0.9 1.3 11.5 5 1.1 0.9 1.4 16.2 10 1.2 1.25 1.6 20.7 15 1.2 1.25 1.6 22.8 20 1.3 1.6 1.7 26.0 30 1.3 1.6 1.8 29.8

0.50 ( 1/ 0.8)

50 1.5 1.6 2.0 36.1 1 0.8 0.9 1.3 11.4

2 (Quad) 0.8 0.9 1.3 12.3 5 1.1 0.9 1.5 17.9 10 1.2 1.25 1.6 22.9 15 1.3 1.6 1.7 26.4 20 1.3 1.6 1.8 29.1 30 1.5 1.6 1.9 33.9

0.50 ( 16/ 0.2)

50 1.7 2.0 2.1 42.1 1 0.8 0.9 1.3 11.8

2 (Quad) 0.8 0.9 1.4 13.0 5 1.2 1.25 1.5 19.7 10 1.2 1.25 1.7 24.3 15 1.3 1.6 1.8 28.1 20 1.5 1.6 1.8 30.2 30 1.5 1.6 2.0 36.2

1.0 (1/1.13)

50 2.0 2.0 2.2 45.7 1 0.8 0.9 1.4 12.9

2 (Quad) 0.9 0.9 1.4 14.3 5 1.2 1.25 1.6 22.1 10 1.3 1.6 1.8 28.4 15 1.5 1.6 1.9 32.2 20 1.5 1.6 2.0 35.7 30 1.7 2.0 2.1 42.5

1.5 (7/0.53)

50 2.0 2.5 2.4 53.4



BS5308 Part 1 – Individually & Collectively Screened, Unarmored Type – 1 Cables. Multipair Polyethylene insulated cables with Individual pair screens and collectively screened

TABLE-3

Conductor size Number of Pairs Thickness of Sheath Nominal Overall Diameter

mm² mm mm 2 0.9 10.3 5 1.2 13.5 10 1.2 18.3 15 1.3 21.1 20 1.3 23.5 30 1.5 27.9

0.50 ( 1/ 0.8)

50 2.0 36.1 2 1.1 12.0 5 1.2 15.2 10 1.3 21.1 15 1.5 24.5 20 1.5 27.3 30 1.7 32.3

0.50 ( 16/ 0.2)

50 2.2 41.7 2 1.1 12.8 5 1.2 15.2 10 1.3 22.6 15 1.5 26.2 20 1.7 29.8 30 2.0 35.4

1.0 (1/1.13)

50 2.2 44.9 2 1.2 14.7 5 1.3 18.8 10 1.5 26.5 15 1.7 30.8 20 1.7 34.4 30 2.0 41.0

1.5 (7/0.53)

50 2.2 52.2



BS5308 Part 1 – Individually & Collectively Screened, Armored Type – 2 Cables. Multipair Polyethylene insulated cables with Individual pair screens and collectively screened

TABLE-4

Conductor size

Number of Pairs


Size of Armour wire

Thickness of Sheath


mm² mm mm mm mm 2 0.8 0.9 1.3 11.5 5 1.1 0.9 1.4 16.2 10 1.2 1.25 1.6 20.7 15 1.2 1.25 1.6 22.8 20 1.3 1.6 1.7 26.0 30 1.3 1.6 1.8 29.8

0.50 ( 1/ 0.8)

50 1.5 1.6 2.0 36.1 2 1.1 0.9 1.5 16.8 5 1.2 1.25 1.6 20.9 10 1.3 1.6 1.8 27.9 15 1.5 1.6 1.8 31.3 20 1.5 1.6 1.9 34.3 30 1.7 2.0 2.1 40.5

0.50 ( 16/ 0.2)

50 2.2 2.5 2.4 51.5 2 1.1 0.9 1.5 17.6 5 1.2 1.25 1.6 21.9 10 1.3 1.6 1.8 29.4 15 1.5 1.6 1.9 33.2 20 1.7 2.0 2.0 37.8 30 2.0 2.0 2.2 43.8

1.0 (1/1.13)

50 2.2 2.5 2.5 54.9 2 1.2 1.25 1.6 20.4 5 1.3 1.6 1.7 25.4 10 1.5 1.6 1.9 33.5 15 1.7 2.0 2.0 38.8 20 1.7 2.0 2.1 42.6 30 2.0 2.5 2.4 50.8

1.5 (7/0.53)

50 2.2 2.5 2.7 62.6



Multicore Instrumentation Cables

BS5308 Part 2 PVC Insulated (300/500V)

Construction

Conductors Plain annealed copper conductors complying with BS6360

Insulation PVC type TI1 to BS7655

Pairing Two insulated conductors uniformly twisted together with a lay length not exceeding 100 mm.

Pair identification COLLECTIVELY SCREENED CABLES

Colour coded in accordance with appendix 2 or by number of tapes

Cable Assembly Pairs are assembled in concentric layers using the reciprocating lay technique.

Binder A non-hygroscopic binder tape is applied over the final layer of pairs.

Collective Screen An aluminum / polyester tape is applied with the metallic side down in continuous contact with a 0.5mm2 tinned copper drain wire over the binder tape.

Outer Protection TYPE 1 Extruded PVC sheath type TM1 or type 6 TYPE 2 Extruded PVC bedding of type TM1

Galvanized steel wire armour Extruded PVC sheath of type TM1

Standard sheath colour – Black. Electrical Characteristics

Conductor Size Unit of Measurement

0.5 mm2

(16/0.2) 1.00 mm2

(24/0.2) 1.5 mm2

(7/0.53) Mutual capacitance core to core (max) pF/m 250 250 250 L/R ratio (max) mH/ohm 25 25 40 Conductor Resistance Resistance at 20oC Ohms 39.7 26.5 12.3 Insulation resistance Core –core/ Screen/Armour for 1 hr at 20ºC M.ohms 25 25 25 Screen to screen for 1 hr at 20ºC M.ohms 1 1 1

Rated voltage 300/500 volt test voltage 1000 volt for 1 min.

Conductor Nominal Area (mm²)

Nom. Insulation Thickness (mm)

Maximum Core Diameter (mm)

0.50 (16/0.2) 0.50 2.35 0.75 (24/0.2) 0.60 2.55 1.50 (7/0.53) 0.60 3.00



BS5308 Part 2 – Collectively Screened, Unarmored Type –1 Cables Multipair PVC insulated without Individual pair screens but collectively screened.

TABLE-5

Conductor size Number of Pairs Thickness of Sheath Nominal Overall Diameter mm² mm mm

1 0.8 7.0 2 (Quad) 0.8 7.9

5 1.1 13.1 10 1.2 17.2 15 1.3 19.8 20 1.3 22.3 30 1.5 26.9

0.50 ( 16/ 0.2)

50 1.7 33.9 1 0.8 7.3

2 (Quad) 0.8 8.3 5 1.2 14.3 10 1.3 18.7 15 1.3 21.4 20 1.5 24.5 30 1.7 29.5

0.75 (24/0.2)

50 2.0 37.4 1 0.8 8.3

2 (Quad) 0.9 9.7 5 1.2 16.4 10 1.3 21.6 15 1.5 25.2 20 1.5 28.5 30 1.7 34.3

1.5 (7/0.53)

50 2.0 43.6



BS5308 Part 2 – Collectively Screened, Armored Type–2 Cables Multipair PVC insulated without Individual pair screens but collectively screened

TABLE-6

Conductor size Number of Pairs


Size of Armour wire

Thickness of Sheath


mm² mm Mm mm mm 1 0.8 0.9 1.3 11.4

2 (Quad) 0.8 0.9 1.3 12.3 5 1.1 0.9 1.5 17.9 10 1.2 1.25 1.6 22.9 15 1.3 1.6 1.7 26.4 20 1.3 1.6 1.8 29.1 30 1.5 1.6 1.9 33.9

0.50 ( 16/ 0.2)

50 1.7 2.0 2.1 42.1 1 0.8 0.9 1.3 11.7

2 (Quad) 0.8 0.9 1.4 12.9 5 1.2 1.25 1.5 19.8 10 1.3 1.6 1.7 25.3 15 1.3 1.6 1.8 28.2 20 1.5 1.6 1.8 31.3 30 1.7 2.0 2.0 37.5

0.75 (24/0.2)

50 2.0 2.0 2.2 45.8 1 0.8 0.9 1.4 12.9

2 (Quad) 0.9 0.9 1.4 14.3 5 1.2 1.25 1.6 22.1 10 1.3 1.6 1.8 28.4 15 1.5 1.6 1.9 32.2 20 1.5 1.6 2.0 35.7 30 1.7 2.0 2.1 42.5

1.5 (7/0.53)

50 2.0 2.5 2.4 53.4



BS5308 Part 2 – Individually & Collectively Screened, Unarmored Type – 1 Cables Multipair PVC insulated cables with Individual pair screens and collectively screened

TABLE-7

Conductor size Number of Pairs Thickness of Sheath Nominal Overall Diameter mm² mm mm

2 1.1 12.0 5 1.2 15.2 10 1.3 21.1 15 1.5 24.5 20 1.5 27.3 30 1.7 32.3

0.50 ( 16/ 0.2)

50 2.2 41.7 2 1.1 12.8 5 1.2 16.3 10 1.3 22.7 15 1.5 26.4 20 1.7 28.8 30 2.0 35.5

0.75 (24/0.2)

50 2.2 45.0 2 1.2 14.7 5 1.3 18.8 10 1.5 26.5 15 1.7 30.8 20 1.7 34.4 30 2.0 41.0

1.5 (7/0.53)

50 2.2 52.2

84 Bobbin Armouring machine



BS5308 Part 1 – Individually & Collectively Screened, Armored Type – 2 Cables Multipair PVC insulated cables with Individual pair screens and collectively screened

TABLE-8

Conductor size Number of Pairs Thickness of Bedding

Size of Armour wire

Thickness of Sheath


mm² mm mm mm mm 2 1.1 0.9 1.5 16.8 5 1.2 1.25 1.6 20.9 10 1.3 1.6 1.8 27.9 15 1.5 1.6 1.8 31.3 20 1.5 1.6 1.9 34.3 30 1.7 2.0 2.1 40.5

0.50 ( 16/ 0.2)

50 2.2 2.5 2.4 51.5 2 1.1 0.9 1.5 17.6 5 1.2 1.25 1.6 22.0 10 1.3 1.6 1.8 29.5 15 1.5 1.6 1.9 33.4 20 1.7 2.0 2.0 37.8 30 2.0 2.0 2.2 43.9

0.75 (24/0.2)

50 2.2 2.5 2.5 55.0 2 1.2 1.25 1.6 20.4 5 1.3 1.6 1.7 25.4 10 1.5 1.6 1.9 33.5 15 1.7 2.0 2.0 38.8 20 1.7 2.0 2.1 42.6 30 2.0 2.5 2.4 50.8

1.5 (7/0.53)

50 2.2 2.5 2.7 62.6



BS5308 Part 2 – Collectively screened Unarmoured – Type 1 Cables Multicore PVC insulated cables Collectively screened

TABLE-9

Conductor size Number of Cores Thickness of Sheath Nominal Overall Diameter

mm² mm mm 2 0.8 7.0 3 0.8 7.3 4 0.8 7.9 6 0.9 9.3 10 1.1 11.9 20 1.2 14.9 40 1.3 20.1

0.50 ( 16/ 0.2)

80 1.5 26.3 2 0.8 7.3 3 0.8 7.7 4 0.8 8.3 6 0.9 9.9 10 1.1 12.7 20 1.2 16.0 40 1.3 21.7

0.75 (24/0.2)

80 1.5 28.5 2 0.8 8.3 3 0.9 8.9 4 0.9 9.7 6 1.1 11.7 10 1.2 14.7 20 1.3 18.7 40 1.5 24.6

1.5 (7/0.53)

80 1.7 33.6



BS5308 Part 2 – Collectively screened Armoured – Type 2 Cables Multicore PVC insulated cables with Collectively screened

TABLE-10

Conductor size Number of Cores Thickness of Bedding

Size of Armour wire

Thickness of Sheath


mm² mm mm mm mm 2 0.8 0.9 1.3 11.4 3 0.8 0.9 1.3 11.7 4 0.8 0.9 1.3 12.3 6 0.9 0.9 1.4 13.9 10 1.1 0.9 1.5 16.7 20 1.2 1.3 1.6 19.6 40 1.3 1.6 1.7 26.7

0.50 ( 16/ 0.2)

80 1.5 1.6 1.9 33.3 2 0.8 0.9 1.3 11.7 3 0.8 0.9 1.3 12.1 4 0.8 0.9 1.4 12.9 6 0.9 0.9 1.4 14.5 10 1.1 0.9 1.5 17.5 20 1.2 1.25 1.6 21.7 40 1.3 1.6 1.8 28.5

0.75 (24/0.2)

80 1.5 1.6 2.0 35.7 2 0.8 0.9 1.4 12.9 3 0.9 0.9 1.4 13.5 4 0.9 0.9 1.4 14.3 6 1.1 0.9 1.4 16.3 10 1.2 1.25 1.6 20.4 20 1.3 1.6 1.7 25.3 40 1.5 1.6 1.9 31.6

1.5 (7/0.53)

80 1.7 2.0 2.1 41.8



Cable Construction and Characteristics Insulation Materials Two types of insulating materials are used in the manufacture of Instrumentation cables PVC or polyethylene. These materials comply with International (IEC) or British Standards. The choice of insulation material to be used for any application is dependant on:

• Conductor temperature • Electrical characteristics required • Flexibility • Compatibility

These are the most common types of extruded material used in the manufacture of Instrumentation cables.

Specification Designation Max Operating Temp General Application PVC BS 7655 section 3.1 TI 1 70 °C General purpose BS 7655 section 3.1 TI 2 70 °C Flexible (incl. Transparent) BS 7655 section 3.1 TI 3 90 °C Heat Resistant BS 7655 section 3.1 TI 4 70 °C Low temperature installations BS 7655 section 3.1 TI 5 70 °C Flexible for low temperature installations Polyethylene BS 6234 03 65 °C Telecommunications and data cables

Core/Pair Identification Multipair Cables The cores within a pair are identified by one of the following methods:

A. By printing a reference code on one insulated conductor, or both of them, that indicates the number of that single pair.

B. By a numbered non - hygroscopic tape applied over the pair. C. By using different colour combinations to uniquely identify the pair.

Cable Assembly Elements from the cable (cores or pairs) are assembled to form the cable. A non-hygroscopic binder tape is usually applied over the final layer.



Communications Core or Pair A communication core or pair for telephone communication can be applied in the outer layer of the assembly. The most common configuration of the communication wire(s) is 7/0.3 mm (0.5mm2) of plain annealed copper insulated with the same material as the main conductors. The colour of the communication wire(s) can be easily identified from that of the main cores. Electrical Screening In addition to using twisted pairs to reduce crosstalk, the screening of the cables or an element of the cable, is often required to protect signals from outside electromagnetic, electrostatic and radio frequency interference. Further consideration could be the protection of electronic equipment in the locality from emission from the cable itself, or the prevention of an antennae effect from the cable into electronic equipment. Armouring/Mechanical Protection Galvanised Steel Wire Armour Galvanised steel wires applied spirally over an inner sheath or bedding, giving a full coverage offering mechanical protection of the cable assembly. The diameter of the armour wire varies with the diameter of the cable assembly. The armour can be used as the pulling medium when installing cables. This type of armouring is very common in the Middle East. Steel wire armoured cables are suitable for direct burial. One or more copper wires can be incorporated in the armour to increase the conductivity of the armour where it is being used as an earth return. Non-Metallic Sheaths Inner Sheath/Bedding An inner sheath or bedding is normally applied between the screened cable assembly and the metallic sheath or armour. Materials commonly used by Oman Cables are PVC or Polyethylene compounds. Where the inner sheath is primarily for mechanical purposes the materials may have no specific requirements. Outer Sheath Most of the commonly used sheathing materials comply with International (IEC), or British Standards. The choice of sheathing materials to be used for any application is dependent on :

o Temperature o Flexibility o Electrical characteristics o Smoke and acid gas emission limitations o Resistance to chemicals o Water resistance o Exposure to UV



The following are the most common types of extruded material used for sheathing of Instrumentation cables

Specifications Designation Max. operating temperature Application

PVC BS 7655 Section 4.1 TM1 70ºC General Purpose BS 7655 Section 4.1 TM2 70ºC General Purpose – flexible BS 7655 Section 4.1 TM4 70ºC Low Temperature BS 7655 Section 4.2 Type 5 85ºC High Temperature – hard BS 7655 Section 4.2 Type 6 70ºC General purpose

BS 7655 Section 4.2 Type 9 - Use over cables operating at a max. conductor temperature of 90oC

Wire Drawing



Appendix 1 Colour Coding As per BS 5308 Part 1 Two-pair unscreened cables are cabled in quad formation and colour coded in clockwise order of rotation, Black, Blue, Green, Brown. All other cables up to 50 pairs conform to the following coding:

Pair Number A wire B wire Pair Number A Wire B Wire 1 Black Blue 26 White Yellow 2 Black Green 27 Red Yellow 3 Blue Green 28 Orange Yellow 4 Black Brown 29 Black Grey 5 Blue Brown 30 Blue Grey

6 Green Brown 31 Green Grey 7 Black White 32 Brown Grey 8 Blue White 33 White Grey 9 Green White 34 Red Grey

10 Brown White 35 Orange Grey

11 Black Red 36 Yellow Grey 12 Blue Red 37 Black Violet 13 Green Red 38 Blue Violet 14 Brown Red 39 Green Violet 15 White Red 40 Brown Violet

16 Black Orange 41 White Violet 17 Blue Orange 42 Red Violet 18 Green Orange 43 Orange Violet 19 Brown Orange 44 Yellow Violet 20 White Orange 45 Grey Violet

21 Red Orange 46 Black Turquoise 22 Black Yellow 47 Blue Turquoise 23 Blue Yellow 48 Green Turquoise 24 Green Yellow 49 Brown Turquoise 25 Brown Yellow 50 White Turquoise



Colour Coding As per BS5308 Part 2 Identification of pairs Two-pair unscreened or collectively screened cables are quad formation and colour coded in clockwise order of rotation, Blue, Green, Orange, Brown. All other cables up to 50 pairs conform to the following coding.

Pair Number A wire B wire Pair Number A Wire B Wire 1 White Blue 26 RED-Blue Blue 2 White Orange 27 RED-Blue Orange 3 White Green 28 RED-Blue Green 4 White Brown 29 RED-Blue Brown 5 White Grey 30 RED-Blue Grey

6 Red Blue 31 BLUE-Black Blue 7 Red Orange 32 BLUE-Black Orange 8 Red Green 33 BLUE-Black Green 9 Red Brown 34 BLUE-Black Brown 10 Red Grey 35 BLUE-Black Grey

11 Black Blue 36 YELLOW-Blue Blue 12 Black Orange 37 YELLOW-Blue Orange 13 Black Green 38 YELLOW-Blue Green 14 Black Brown 39 YELLOW-Blue Brown 15 Black Grey 40 YELLOW-Blue Grey

16 Yellow Blue 41 WHITE-Orange Blue 17 Yellow Orange 42 WHITE-Orange Orange 18 Yellow Green 43 WHITE-Orange Green 19 Yellow Brown 44 WHITE-Orange Brown 20 Yellow Grey 45 WHITE-Orange Grey

21 WHITE-Blue Blue 46 ORANGE-Red Blue 22 WHITE-Blue Orange 47 ORANGE-Red Orange 23 WHITE-Blue Green 48 ORANGE-Red Green 24 WHITE-Blue Brown 49 ORANGE-Red Brown 25 WHITE-Blue Grey 50 ORANGE-Red Grey

NOTE Except in the case of bi-colour extrusion the colour indicated in block letters is known as the base colour & is

a) the extruded colour and b) the colour with the greater area if exposure on the finished wire.

instrumentation cables

Documents

multipair cables

armored type2 cables

unarmored type

unarmoured type

cable construction

electrical characteristics

polyethylene insulated

insulation materials