module 3 handout - 2012 electrical code changes - final 28 — motors and generators ... ex d...

2012 Electrical Code Changes – Module 3

Sections 18 - 36

ETEL-12(02)-00 (2012-03-26)

© British Columbia Safety Authority, 2012 1

TableofContentsSection 18 — Hazardous Locations ........................................................................................................... 2 Section 20 — Flammable Liquid and Gas Dispensing and Service Stations, Garages, Bulk Storage Plants, Finishing Processes, and Aircraft Hangars .................................................................. 8 Section 22 — Locations in which Corrosive Liquids, Vapours, or Excessive Moisture are Likely to be Present .................................................................................................................................................... 11 Section 24 — Patient Care Areas ............................................................................................................ 11 Section 26 — Installation of Electrical Equipment ................................................................................. 13 Section 28 — Motors and Generators ..................................................................................................... 25 Section 30 — Installation of Lighting Equipment ................................................................................... 26 Section 32 — Fire Alarm Systems, Fire Pumps, and Carbon Monoxide Alarms (See Appendix G) ....................................................................................................................................................................... 27 Section 36 — High-Voltage Installations ................................................................................................. 32


2012 ELECTRICAL CODE CHANGES Module 3

There have been numerous changes to the 2012 Canadian Electrical Code. The following material only describes changes which may be considered as major. For complete Code information, refer to the 2012 Canadian Electrical Code available at www.csa.ca. Please note: minor electrical code changes are not covered in this material.

Section 18 — Hazardous Locations Rule 18-052 Marking (see Appendix B) Equipment Protection Levels are an alternative and additional specification for equipment made in accordance with the IEC standards. Throughout Section 18, the reference to Equipment Protection Levels (EPL) has been added where rules prescribe the type of equipment required for a particular location. Equipment Protection Level (EPL) This new marking system is identified in Rules 18-090 (2) and 18-100. Since 2007, the IEC Technical Standards have recognized that there may be occasions where it is necessary to increase, above the normal levels, the protection against ignition sources. This concept allows for consideration of risk (i.e. consequences of an explosion) as opposed to just the probability of a flammable atmosphere existing - the conventional selection criteria between the types of protection and the zone of use. In order to introduce the concept of a declared level of safety, IEC agreed to introduce 'Equipment Protection Levels' (EPL's). These are Ga, Gb and Gc for gas and Da, Db and Dc for dust. These are an alternative and additional specification for equipment made in accordance with the standards.


The following two tables show the normal relationship between EPL and zone, and the EPL awarded to each type of protection.

Equipment Protection Level (EPL)

Normal Applicable Zone(s)

Ga 0 (and 1 and 2) Gb 1 (and 2) Gc 2

Equipment Code

Description EPL

Ex ia Intrinsic safety 'ia' GaEx ib Intrinsic safety 'ib' GbEx ic Intrinsic Safety 'ic' GcEx d Flameproof protection Gb Ex p Purge/pressurized protection GbEx px Purge/pressurized protection 'px' GbEx py Purge/pressurized protection 'py' GbEx pz Purge/pressurized protection 'pz' GcEx e Increased safety GbEx m Encapsulation GbEx ma Encapsulation Ga


Class 1 Zone O Locations Rule 18-090 Equipment and wiring (see Appendices B and F) In Class 1 Zone 0 locations, equipment marked as providing EPL “Type Ga” will provide protection just as equipment marked “intrinsically safe equipment Type ia”. The methods of protection used or the design incorporated to provide the protection is not required as the marking “Ga” alone provides the necessary certification. However, the Gas Group and Temperature Code markings are still mandatory. Class 1 Zone 1 Locations Rule 18-100 Equipment in Class I, Zone 1 locations (see Appendices B and F) Throughout Section 18, the reference to Equipment Protection Level (EPL) equipment has been added where rules prescribe the type of equipment required for a particular location. In Class 1 Zone 1 locations, equipment marked as providing EPL Type “Ga” or “Gb” will provide protection equivalent to equipment identified as providing a method of protection “d”, “e”, “o”, “p”, etc. The following is an example of new general labelling on a distributor enclosure with increased safety level. This sample equipment label includes: 1) the required marking to meet ATEX standards (not recognized in North America) 2) the required IEC marking, signifying the type of protection utilized and 3) the new CEC recognized Equipment Protection Level marking Gb,

1) Category 2G: Suitable for Zone 1; 2) Increased safety: Suitable for Zone 1; 3) Equipment protection level Gb: Suitable for Zone 1 Each of these markings indicate suitable for use in a Class 1, Zone 1 location


Rule 18-108 Sealing, Class I, Zone 1 (see Appendix B) Subrule (3) has been revised to simplify the language used around the requirement for sealing. The new wording requires a seal at the first termination inside the Class 1 Zone 1 location regardless of the type of equipment or fitting supplied and is worded like the requirements for a conduit that leaves a Zone 1 location. This similarity is intended to increase safety by removing the inconsistency between wiring methods.

Class 1 Zone 1 Hazardous Location

Normal locationSealing type connector approved for Class 1 Zone 1 locationto be installed on the first device in the zone

Note: the rigid conduit, if smaller than 53mm, does not require a sealing fitting as the JB does not (should not) generate arcs, sparks or high temperatures in normal operation and does not leave the location in this diagram. Rule 18-150 Equipment in Class I, Zone 2 locations (see Appendices B and F) The wording “Where required by other Rules of this Code” has been added to fix an editorial mistake. Now the wording recognizes other Rules regarding the acceptability of equipment in Class 1, Zone 2 locations. Item (c) has been added as in Zone 0 and Zone 1 subsections recognizing equipment designed to IEC standards and labeled with an Equipment Protection Level designation. 18-152 Wiring methods, Class I, Zone 2 (see Appendix B) Rule 18-152 has been revised to include types RC90 and RA90 armoured cable as acceptable for use in Class 1 Zone 2 locations


Rule 18-154 Sealing, Class I, Zone 2 (see Appendix B) The requirement to provide sealing for a cable less than 10m in length has been removed from the Code. Now paragraph (b) requires a sealing type fitting be installed where the cable terminates at equipment in the Zone 2 location and the other end terminates in a non-hazardous location where a negative pressure greater than 0.2kPa exists (0.2kPa is equal to approximately 0.03 psi).

Rule 18-202 Wiring methods, Class II, Division 1 (see Appendix B) The acceptable wiring methods have not been changed. The net result of the revision is to separate the two wiring methods into items rather than leave them lumped into one longer Subrule. The notation that cables needed to be used “with associated cable glands approved for the particular hazardous location” has been removed. The wording was unnecessary as the installation cannot be made to comply without using approved type fittings. Rule 18-252 Wiring methods, Class II, Division 2 (see Appendix B) Subrule (d) - The previous Code recognized Type ACWU as suitable in this location. Now additional armoured cable types are recognized. Subrule (f) - Type CIC (control and instrumentation cable) has been added as an acceptable wiring method but with the restrictions noted.


Rule 18-302 Wiring methods, Class III, Division 1 (see Appendix B) Subrule 18-302(1) has been revised to clarify acceptable wiring methods within a Class 3, Division 1 location. Each acceptable wiring method has been separately listed. Armoured cables with overall jacket have been added and include Teck90, ACWU90, copper-sheathed and aluminum sheathed cable. When armoured control and instrument cable (Type ACIC) is used within a Class 3 Div 1 location, it must have interlocking armor and a continuous jacket.

Pictured above: Armoured Control & Instrumentation Cable, 300 Volts, PVC Insulation. This cable is suitable for installation in cable trays in dry, damp and wet locations or for direct burial and may be extended through sealing glands without removal of the individual shields, when installed in Hazardous Locations containing A, B, C & D atmospheres as defined by the Canadian Electrical Code. Rule 18-322 Electric cranes, hoists, and similar equipment, Class III, Division 1 Rule 18-322 has been re-written for clarification to the user of the requirements surrounding system requirements and ground fault detection when installing electric cranes, hoists, and similar equipment for operation over combustible fibres or accumulations of flyings and similar such equipment and locations. Rule 18-352 Wiring method, Class III, Division 2 (see Appendix B) This Rule has been revised to separate and clarify acceptable wiring methods within a Class 3, Division 2 location. Each acceptable wiring method has been separately listed. Item (d) is new. Armoured cables with overall jacket have been added and include Teck90, ACWU90, copper-sheathed RC90 and aluminum sheathed RA90 cables. Item (e) is new. Armoured control and instrument cable (Type ACIC) must have interlocking armor and a continuous jacket when used within a Class 3 Div 1 location. Item (f) reference to Type TC (tray cable) cable is new and demonstrates how the previous Code wording has been expanded. The previous Electrical Code mentioned “or cables approved for hazardous locations with associated cable glands approved for the particular hazardous location”. Item (g) is similar to item (f). When control and instrument cable (Type CIC) is used within a Class 3, Division 2 location, the non-armoured version (Type CIC) is permitted subject to the limitations listed.


Section 20 — Flammable Liquid and Gas Dispensing and Service Stations, Garages, Bulk Storage Plants, Finishing Processes, and Aircraft Hangars Rule 20-060 Scope A minor change has been made to the Subsection title. The word “and” was removed to make “compressors” a stand alone category. Compressors can be found at other types of facilities besides storage facilities. Rule 20-062 Hazardous Areas This rule has been extensively revised. The former Rule attempted to describe all of the locations where a classified location could be situated. A newly expanded Table 64 “Class I, Zone 1 space surrounding compressed natural gas (NGV) storage” has been developed for the purpose of classifying hazardous locations. Previous Code Rule 20-064 has been deleted and the other Rules in this sub-section have been renumbered. Rule 20-102 Hazardous areas Showrooms shall not be classified as hazardous areas when separated from a service and repair area by tight-fitting barriers such as curbs, ramps or partitions at least 50mm high.


Rule 20-110 Equipment above hazardous areas (see Appendix I) Previous editions of the Code required fixed lighting which was subject to damage over lanes and similar areas to be installed at least 3.6m above floor level. Where this was not possible, luminaires of the totally enclosed type or those constructed to prevent the escape of sparks or hot metal parts were required. This new revision permits fixtures approved for non-hazardous locations to be installed. To prevent fixture damage, the Rule still requires the fixture to be mounted 3.6m above the finished floor or be mechanically protected by a guard or location where installed at less than that height.

Lane Area

less than3.6m

Any luminaire suitable for non hazardous location

Any Luminaire suitable for non hazardous location with mechanical protection (wire guard or similar)

More than3.6m

• Installed more than 3.6m, any luminaire suitable for normal locations is

OK. • Installed below 3.6m, any luminaire suitable for normal locations

protected from mechanical injury by a guard or location. Rule 20-506 Wiring not within hazardous areas Rule 20-506 has been revised to recognize wiring methods using types aluminum sheathed or copper sheathed cables as approved.


Section 22 — Locations in which Corrosive Liquids, Vapours, or Excessive Moisture are Likely to be Present Changes and revisions in Section 22 of the Code are editorial in nature and have been made to recognize the selection of conductors or cables shall be made in accordance with Rule 4-008(1) or to recognized copper–sheathed cable as an acceptable wiring method.

Section 24 — Patient Care Areas Rule 24-102 Circuits in basic care areas (see Appendix B) Hospitals, doctor offices and private clinics may have more than one classified patient care area within the premises. This can result in some wiring systems being designated as “essential” with faster restoration times during a normal power outage. This Subrule has been added to inform users that branch circuit wiring supplied from an essential wiring system shall not be used to supply receptacles or permanently connected equipment in other areas of the facility. The hospital administrator or designate determines the classification of all patient care areas. Rule 24-104 Bonding to ground in basic care areas (see Appendix B) Besides communication, radio and cable TV equipment, other equipment in a patient care area having conductive parts may come in contact with or provide a conductive path to a patient. Medical gas, water lines and suction equipment are types of these systems. New Subrule (8) has been provided to require these systems be bonded to ground with a conductor sized to T16 but not smaller than #12. This bonding conductor shall be terminated in accordance with Subrule (3).


These are examples of locations within a patient care

environment where a conductive path to ground could be found. Rule 24-106 Receptacles in basic care areas (see Appendix B) The wording of Subrule (6) has been re-written to clarify which receptacles must be coloured red in patient care areas. Rule 24-306 Emergency supply This revision has removed former Subrule (2). Information and standards around generator installation and performance is provided in CAN Standard: C282-09 - Emergency electrical power supply for buildings. This consensus based Standard provides design, installation, operation, maintenance and testing requirements for emergency electrical power generators and associated equipment for use by generator set designers, manufacturers, installation contractors, maintenance contractors, building inspectors and commissioners in buildings where emergency power generators are mandated by the BC Building Code and local building by-laws.


Section 26 — Installation of Electrical Equipment The dangers of cellulose nitrate film Cellulose nitrate film is extremely dangerous. It catches fire very easily and once alight is difficult to put out. Fires involving cellulose nitrate burn extremely quickly with a hot, intense flame and the smoke is particularly toxic, containing large quantities of poisonous gases. Any cellulose nitrate film that you come across now will be extremely old. This is a problem because the high fire risk from cellulose nitrate film increases as it ages. Old cinematographic film and old photographic negatives (including X-ray film) may be made from cellulose nitrate (which means they contain nitrated cellulose or other nitrated product). These films are sometimes referred to as ‘nitrate’, ‘nitratebased’, ‘nitro-cellulose based’ or ‘celluloid’ film (although the term ‘celluloid’ is often used these days to refer to film in general, it may not actually contain cellulose nitrate). Why is cellulose nitrate film dangerous? It is the nitro-cellulose that makes cellulose nitrate-based film so dangerous to store and handle. It is hazardous because: • it can start to decompose and become unstable at temperatures as low as 38ºC,

giving off large quantities of poisonous gases, which could cause an explosion. Warmth and humidity (moisture) accelerate this decomposition;

• it catches fire very easily and burns extremely quickly, with a hot and intense flame; • it produces very dense, poisonous smoke containing copious amounts of choking

nitrogen dioxide fumes; and • unlike many other flammable materials, nitro-cellulose does not need the oxygen in

the air to keep burning and once it is burning it is extremely difficult to put out. Immersing burning film in water may not extinguish the fire and it could actually increase the amount of smoke produced.

Cellulose nitrate film should, because of its age and the likelihood that it has not been stored in ideal conditions, be treated as being potentially dangerous. If you have film or negatives made from cellulose nitrate (or you think they may be made from cellulose nitrate) keep them well away from any source of heat (e.g. radiators and light bulbs). Do not run film through a projector or put negatives on an enlarger; they can catch fire simply by the heat from the lamp or from friction caused by the film passing over the projector sprockets.

Above information courtesy of

www.hse.gov.uk


For longer storage, use an approved storage vault. The standards for design, construction, and use of storage cabinets and vaults for historical nitrate films are based on years of experience by the National Board of Fire Underwriters and are supported by the experience of the National Archives and the National Bureau of Standards.

The important principles supporting the Underwriters' regulations are based on

• elimination of all possible means of starting a fire • control of, and protection against, the spread of fire • segregation of large quantities of film into small protected units • ample provision for safety to human life • proper ventilation and exhaust system

These are the important reasons behind every detail of an approved building construction, self closing fire doors, exits, vents, light fixtures, electrical systems, heating equipment, and automatic sprinklers, etc.

Vaults for commercial storage are limited to 750 cubic feet with a vent area not less than 200 square inches per 1,000 pounds, or a total of 2,000 square inches for the standard size vault. A sprinkler is required for every 62.5 cubic feet of space or 12 for a 750 cubic foot vault.

Vaults for long term storage are limited to 100 cubic feet with a vent area of at least 2,670 square inches, and with no less than eight sprinklers. Both sprinklers and ventilation provide about five times the safeguards suggested for that of commercial storage.

Shelves in long term film vaults should be divided into individual compartments with not less than 3/4 inch thick non combustible insulating material. Each compartment should hold only one, or at most two, film containers.

The ceiling water sprinklers should be directed so that all shelves will be drenched in the event of fire. The individual containers will protect the film from water damage.

Air conditioning systems in film vaults should be installed according to regulations of the National Board of Fire Underwriters. Automatic fire dampers should be installed in the air ducts so that a fire in one vault will not spread to another and so that the toxic gases given off will not be distributed to other rooms, but will be vented outside. The Underwriters' regulations do not provide for control of air temperature and relative humidity in the storage of nitrate film other than that temperatures must not exceed 21°C (70°F). This is a safety precaution. Additional precautions are required from the standpoint of film preservation.

Above information courtesy of www.motion.kodak.com


Rule 26-360 General This new Rule defines the scope of the section. Rule 26-362 - Equipment in film-vaults This new rule restricts the installation to fixed lighting only. Modern film vaults store the film canisters in smaller groups and separate them with fire-resistant shelving. Only lighting is permitted in the vault due to the extremely flammable characteristics of nitrate film. Rule 26-364 - Wiring methods in film-vaults Subrule (1) - The nature of cellulose nitrate requires wiring methods prescribed by Rules 18-152 (a), (b), and (d). These wiring methods are associated with Class 1 Zone 2 installations. Subrule (2) - This rule is to prevent the spread of noxious gases, smoke and combustion products from one vault to another. Subrule (3) - The conduit between the switch and light fixture shall be “sealed off near the switch”. No reference is made for the seal to comply with Rule 18-108 (approved sealing fittings and sealant) as required for installations in Class1 Zone 2 locations; however an EYS and chico shall be used unless another approved fitting and compound is available. Rule 26-366 - Luminaires in film-vaults Luminaires approved for Class 1 Zone 2 (or Div 2) locations shall be installed. Rule 26-368 - Circuits in film-vaults To ensure maximum safety for someone entering a storage vault as well as to the equipment and contents, the switch is placed outside. A red pilot light will grab people’s attention and all ungrounded conductors shall be de-energized when the switch is open.


Rule 26-700 General (see Appendices B and I) Subrule (9) – This revision is editorial in nature and describes the specific type of GFCI protection required. Subrule (12) - This new addition is another level of protection in a location where children could attempt to insert conductive objects into receptacles. Appendix B note to Rule 26-700 (12) - It is intended by this Rule that unless otherwise designated by an authority having jurisdiction for child care facilities, a “child care facility” is considered to be an area designed to provide care to persons 7 years of age or less. Rule 26-702 Receptacles exposed to the weather (see Appendix B) Currently standard C22.2 No. 42.1 which deals with cover plates for flush mounted wiring devices recognizes that outlets may be tested for use in wet locations: • with electrical equipment plugged in, or • without electrical equipment plugged in Previous versions of Rule 26-702 did not distinguish between the two possible uses. The changes are being made to ensure that receptacle covers provide adequate weather protection when electrical devices are plugged in or not plugged in.

Copyright © 2009, The Reader’s Digest Association, Inc. and its licensors. All rights reserved.


Rule 26-704 Receptacles for maintenance of equipment located on roof tops Appendix B note to Rule 26-704 - The minimum distance of 7.5 m is intended to ensure that a standard 10 m long extension cord will reach the roof top equipment. The minimum 750 mm clearance from the finished roof is intended to ensure that the receptacle remains visible in the event of snow build up.

In this illustration, consider two separate scenarios: • Scenario #1 - the HVAC equipment on the right is the only unit on the rooftop. In this

case a receptacle located anywhere within the prescribed 7.5 M and elevation is acceptable. Caution, WorkSafe BC fall protection requirements apply where a fall hazard exceeds 3m. To avoid fall protection requirements, choose another more suitable location, mount the receptacle more than 2m from the edge, or ensure the pony wall exceeds 2m in height.

• Scenario #2 - both HVAC units are installed on the roof top as shown. One rooftop

receptacle may serve more than one HVAC unit provided the receptacle is located within 7.5m of any unit so served.

Note: If the unit comes with an integral receptacle, it does not satisfy this rule.


Rule 26-710 General (See appendix B) Subrule (d) - The revision is new wording that describes the proper receptacle configuration designation. Subrule (e) - This Rule applies to receptacles installed in all residential occupancies including dwelling units and single dwellings. In previous Codes, item (ii) used the wording “or area”. This wording resulted in inconsistent application of the requirements. Subrule (o) - Appendix B note to Rule 26-710 (o): It is intended by this requirement to recognize a need for additional EV charging infrastructure in residential occupancies only in those cases when such EV charging infrastructure is mandated by the provincial/territorial building codes or local building or zoning regulations. Rule 26-712 Receptacles for dwelling units (see Appendices B and G) Subrule (d)(iii) has been revised to clarify receptacles are required along counter work surfaces whether there is a wall behind the counter or not. Previous editions of the Code required receptacles along the wall “behind counter work surfaces”. This caused confusion for Users and AHJ’s when the counter work surface abutted glass windows or other non-traditional “wall” surfaces which did not provide a means to locate a receptacle. Compliance with this rule may require a receptacle to be mounted in the counter work surface along the wall using pop-up or pedestal mount receptacles which are available at this time.


• The receptacle on the left is not approved for use in Canada. It is shown as a means of meeting the new requirements where a wall is not provided behind the counter space. Any receptacle intended for use must bear acceptable evidence of approval.

• The receptacle on the right is fully approved.


Rules 26-712(d)(iv) and (v) Appendix B Note - It is intended by this Rule that a continuous counter surface is one which is not interrupted by sinks, ranges and other built in equipment. Where there is a sink, range or other built in equipment such as a gas cook top installed in a counter surface, new measurements shall be taken to determine if additional receptacles are required. This may result in more than one receptacle on an island work space.

600mm orgreater

300 mmor greater

600 mmor greater

continuous counter surface

If less than300mmreceptaclenot required

• Where a sink or appliance interrupts a counter surface, a new counter work surface begins. If this new work surface meets the minimum dimensions specified, an additional receptacle will be required.

• In this example, a receptacle is NOT required to the left of the sink as the minimum

300mm dimension is not met.


600 mmor greater

600 mmor greater

300 mmor greater

600mm orgreater

continuous counter surface

600mm orgreater

300 mmor greater

600 mmor greater

600 mmor greater

280 mm

• Where a sink or appliance interrupts a counter surface, a new counter work surface begins. If measurements determine it meets the minimum dimensions specified, an additional receptacle will be required.

• In the upper island example, one of the minimum dimensions is not met; therefore a

receptacle is not required. • In the lower island example, both dimensions are met and there are two counter work

surfaces, one on each side of the sink, therefore a receptacle is required at each location.

• In the peninsula example, both dimensions are met and there are two counter work

surfaces, one on each side of the sink, therefore a receptacle is required at each location.


Rule 26-712(h) – Appendix B Note: The intent of Rule 26-712(h) is to protect children from shock where they may tamper with receptacles accessible to them. For those situations where the receptacle is inaccessible, a non-tamper proof receptacle may be used. Examples of such situations where the receptacle is inaccessible are microwaves in cabinets, refrigerators, freezers, washing machines, those located in an attic or crawl space, or those installed above 2 m from the floor or finished grade.

TR TR TR TR TRTR

Dishwasher

Fridge or Freezer Wine

coolerWasher

Microwave

Garburator , Hot Water Dispenser

Clock outlet above 2 metersCabinet lighting power above 2 meters

TRTamper Resistant receptacle required

Standard receptacle OK to use

Dryer


Areas requiring tamper resistance receptacles

2M

TR Receptacles not required in crawl space

TR Receptacles not required in attic space

exterior

interior

interior

Balconies or decks

TR TR

TRTR

TR

TRTamper resistant receptacle

Standard receptacle


Rule 26-714 Receptacles for single dwellings (see Appendices B and G) Previously the Code was silent in regard to the requirement to install a receptacle for the overhead garage door opener. Rule 26-720 General Subrule (b) applies to branch circuits for all residential occupancies including dwelling units and single dwellings. In previous Codes, the wording “or area” was used. This wording resulted in inconsistent application of the requirements. The subrule now clearly defines when that branch circuit is required. Note that the wording “receptacles” has not changed which still allows all receptacles in a laundry room to be supplied by the laundry room circuit. Subrule (g) is a new item added to require a separate branch circuit. Rule 26-722 Branch circuits for dwelling units (see Appendices B and I) Some electrical equipment is subject to nuisance tripping due to the nature of the equipment design or sometimes the nature of the location. Both AFCI and GFCI protection may be undesirable where the consequences of nuisance tripping cause unwanted conditions. Revisions to Rule 26-722(g) help clarify that a receptacle installed for the dedicated use of a sump pump, does not require AFCI protection. To help ensure the receptacle is not used for unintended purposes and AFCI protection is maximized within the sleeping area, a single (not duplex) receptacle properly identified and on a separate circuit from other receptacles in the bedroom is required.

Image courtesy of

www.visual.merriam-webster.com


Rule 26-744 Supply connections for appliances In previous editions of the Code, Rule 8-300 required branch circuit conductors to be sized to 8kw for a range up to 8kw. This resulted in a conductor sized smaller than the rating of the range receptacle (14-50R/50a). This revision now recognizes and accepts the smaller conductor to supply this receptacle configuration. Rule 26-760 - Special terminology Bare element water heater - a self contained factory assembled water heater that heats water by direct contact with the uninsulated heating element wire. CSA Standard C22.2 No. 64 requires that bare element water heaters be marked "BARE ELEMENT WATER HEATER" and "CHAUFFE-EAU À ÉLÉMENT NU". The requirements for bare element water heaters in CSA Standard C22.2 No. 64 apply to permanently connected heaters and do not apply to cord-connected equipment. Rule 26-762 – General The previous wording “A water heater with a bare heater element immersed in water” has been deleted.

Section 28 — Motors and Generators Rule 28-308 Overload protection not required (see Appendix B) The revision to 28-308 (a) is strictly editorial. The previous (a) has been split into items (i) and (ii). The net result is no change in intent, just easier reading and therefore clarification of the requirements where overload protection is not required. Subrule (c) has not been revised and still references the types of motors which conform to CSA C22.2 No.77. These motors are typically fractional HP with electronic control systems which monitor speed, direction and overload situations. They are used extensively in plenum, duct and damper control of HVAC systems (servo motors).


Section 30 — Installation of Lighting Equipment Rule 30-308 Circuit connections Safety during maintenance remains the foremost reason for requiring a disconnecting means for fluorescent fixtures rated more than 150 volts to ground. This rule has been revised to recognize other acceptable means to provide the required disconnecting means. Rule 30-310 – Luminaire as a raceway The former references to Table 19 and Table 11 have been replaced by the references to select the conductors in accordance with Rule 4-008 and 4-012 respectively. Rule 30-410 - Wiring of show window luminaires The former reference to Table 11 has been replaced by the reference to select the conductors in accordance with Rule 4-012(1). Rule 30-912 - Wiring of recessed fluorescent luminaires The former reference to Table 11 has been replaced by the reference to select the conductors in accordance with Rule 4-012(1). Rule 30-1004 - Wiring methods — Underground The former reference to Table 19 has been replaced by the reference to select the conductors in accordance with Rule 4-008 (1). Rule 30-1102 –Conductors The former reference to Table 19 has been replaced by the reference to select the conductors in accordance with Rule 4-008 (1).


Section 32 — Fire Alarm Systems, Fire Pumps, and Carbon Monoxide Alarms (See Appendix G) Rule 32-100 Conductors As with other revisions throughout the Code, the User of the Code must ensure the selection of conductors used for the Fire Alarm wiring are approved and suitable for the intended purpose. Rule 32-102 Wiring method The requirement to encase rigid PVC conduit in 50mm of concrete or masonry has been removed. Now an exposed surface run of Rigid PVC is an acceptable wiring method in a non-combustible building. Note that the ENT provision in item (d) has additional text added in RED. A CSA errata has been made, requiring type ENT to be embedded in at least 50mm of concrete when used in non-combustible construction. Studies have shown that PVC provides an equivalent level of protection as EMT or similar wiring methods when exposed to a building fire. However, users are cautioned that for some buildings, the BC Building Code requires additional protection from fire exposure for some portions of a fire alarm system which cannot be met by RPVC conduit alone. I.e. Tall buildings. See Appendix B notes for further information.


Rule 32-200 Conductors (see Appendices B and G) The intent of this Rule is to protect the feeder conductors between a fire pump and an emergency power source from fire damage. The BC Building Code and Local Bylaws requires that conductors supplying a life and fire safety equipment be protected against exposure to fire to ensure continued operation of this equipment for a period not less than 1 h. NFPA 20 also mandates protection of circuits feeding fire pumps against possible damage by fire. The following examples illustrate acceptable methods for achieving this protection: Regardless of the method chosen, verification by the Building official or a fire protection engineer is required (a) Using mineral-insulated cables conforming to fire rating requirements as specified in

Clause 5.3 of CSA C22.2 No. 124;

(b) Embedding the raceway containing fire pump feeder conductors in not less than 50

mm of concrete in compliance with the BC Building Code and local building by-laws.

Encasing conventional wiring in concrete is a traditional method for addressing fire protection. 50mm of concrete has historically been considered adequate for one-hour fire resistance; approximately 100mm are required to protect conductors for two hours. However, this is a general statement and an engineers report confirming compliance must be provided to the Building Official who has jurisdiction in this matter.


(c) Installing the raceway containing fire pump feeder conductors in a shaft enclosure or service space of at least 1 h fire resistance construction.

Specific requirements pertaining to the fire resistance rating of a material or an assembly of materials can be found in subsection 3.1.7 of the BC Building Code and Local Bylaws or in the appropriate provincial/territorial legislation. Gypsum fire shaft assemblies are highly complex and difficult to make properly, professional design and certification is required. 32-202 Wiring Method Rule 32-202 applies to both the normal power for the fire pump and portions of emergency power that exit the concrete (if so protected) or portions that exit the fire shaft (if so protected).


32-208 Transfer switch (see Appendix G) The revision to Rule 32-208 is editorial in nature and clarifies the requirements that where a transfer switch is used to supply emergency power to a fire pump, the transfer switch shall be used solely for the fire pump. Other systems may be supplied but must be controlled by their own transfer switches.

Further information can be found in the BC Building Code, see Section 46 3.2.7.9, Emergency power supply for building services (elevators, fire pumps, fans, etc.).

Emergency power Normal power

Fire Pump Controller

Fire Pump Controller Other

emergency loads

Transfer Switch

X

X

In the illustration above, this installation is not compliant as each pump and controller must be separately controlled as shown in illustration below.

This illustration above shows a compliant installation. Each fire pump is supplied by its own transfer switch.


Section 36 — High-Voltage Installations Rule 36-100 Conductors (see Appendix B) Subrule (1) (c) - This revision is editorial only, the previous Code made reference to Subrule (2) (d), armoured cable. This was incorrect as insulated conductors in armoured cable are enclosed in grounded metal (the sheath). Subrule (2) (e) - Type TC tray cable is available in Canada in medium voltage classes up to 46 kV armoured and non-armoured. Rule 36-214 Disconnecting means Subrule (2) – Previously, the Code required the ability to see the switch contacts in “both the open and closed position”. With the advent of new HV switch and circuit breaker designs where visible inspection of the closed contacts is not possible, the Rule has been revised. It is important that the switch contacts be visible in the open position for safety to electrical workers. Where the contacts are not visible in the open position, this Rule applies. Rule 36-302 Station ground electrode Subrule (3) - The revision clarifies that where conditions do not permit the grounding electrode system to be adjacent to the station, a remote grounding installation must comply with Subrule 1(a) and 1(b). The previous Code required compliance with all of Subrule (1) which included connecting all the metal parts within the station to the ground grid and having the remote ground form a loop around the station. This is not possible by the very definition of a “remote Station ground”.

module 3 handout - 2012 electrical code changes - final 28 — motors and generators ... ex d...

Documents