Major Work Activity B - Installs, services and maintains generating, distribution and service systems

Table of Contents

• Task B-7 Installs, services and maintains consumer/supply services and metering equipment
  • B-7.01 Installs single-phase consumer/supply services and metering equipment
  • B-7.02 Installs three-phase consumer/supply services and metering equipment
  • B-7.03 Performs servicing and maintenance of single-phase consumer/supply services and metering equipment
  • B-7.04 Performs servicing and maintenance of three-phase consumer/supply services and metering equipment
• Task B-8 Installs, services and maintains protection devices
  • B-8.01 Installs overcurrent protection devices
  • B-8.02 Installs ground fault, arc fault and surge protection devices
  • B-8.03 Performs servicing and maintenance of protection devices
• Task B-9 Installs, services and maintains power distribution equipment
  • B-9.01 Installs power distribution equipment
  • B-9.02 Performs servicing and maintenance of power distribution equipment
• Task B-10 Installs, services and maintains power conditioning, uninterruptible power supply (UPS) and surge suppression systems
  • B-10.01 Installs power conditioning, UPS and surge suppression systems
  • B-10.02 Performs servicing and maintenance of power conditioning, UPS and surge suppression systems
• Task B-11 Installs, services and maintains bonding and grounding, and ground fault protection and detection systems
  • B-11.01 Installs bonding and grounding systems
  • B-11.02 Installs ground fault protection and detection systems
  • B-11.03 Installs lightning protection systems
  • B-11.04 Performs servicing and maintenance of bonding and grounding systems
• Task B-12 Installs, services and maintains power generation and conversion systems
  • B-12.01 Installs alternating current (AC) generating systems
  • B-12.02 Performs servicing and maintenance of AC generating systems
  • B-12.03 Installs direct current (DC) generating and conversion systems
  • B-12.04 Performs servicing and maintenance of DC generating and conversion systems
• Task B-13 Installs, services and maintains renewable energy generating and storage systems
  • B-13.01 Installs renewable energy generating and storage systems
  • B-13.02 Performs servicing and maintenance of renewable energy generating and storage systems
• Task B-14 Installs, services and maintains high-voltage systems
  • B-14.01 Installs high-voltage equipment
  • B-14.02 Installs high-voltage cables
  • B-14.03 Performs servicing and maintenance of high-voltage systems
• Task B-15 Installs, services and maintains transformers
  • B-15.01 Installs extra-low-voltage transformers
  • B-15.02 Installs low-voltage single-phase transformers
  • B-15.03 Installs low-voltage three-phase transformers
  • B-15.04 Installs high-voltage transformers
  • B-15.05 Performs servicing and maintenance of transformers

Task B-7 Installs, services and maintains consumer/supply services and metering equipment

Task descriptor

Service entrance equipment provides power for single-phase and three-phase electrical systems and equipment. Consumer services can provide normal, emergency and temporary power. This equipment allows for the safe utilization of electricity.

For the purpose of this standard, installation includes both new installations and upgrading of systems by removing and replacing components.

Construction electricians service single- and three-phase consumer/supply services and metering equipment by troubleshooting, diagnosing faults, and repairing them. They also perform maintenance to ensure the consumer/supply services and metering equipment are in good operating condition. Construction electricians may also work with non-utility metering equipment such as energy management with sub-metering or non-billing. Construction electricians typically install metering equipment such as current transformers (CTs) and voltage transformers (VTs).

Range of variables

• services include overhead, underground, temporary
• service components include supports, enclosures, raceways, conduit, meter sockets, panels, service mast, point of attachment
• service conductors include wire, cables, conductors
• fasteners include screws, straps, inserts, anchors, wedge clamps, seismic restraints
• metering equipment includes: meter sockets, CTs, VTs (previously called potential transformers), enclosures
• grounding electrodes include manufactured (rods, plates, clamps), field assembled (buried copper conductors), in-situ (metallic water pipes, metallic pilings)
• non-electrical metallic piping and structures include: gas lines, water lines, metallic building structures

Range of variables

• single-phase services include temporary service, overhead, underground, single and multiple metering
• service conductors include wire, cables, conductors
• service components include supports, enclosures, raceways, conduit, meter sockets, panels, service mast, point of attachment
• fasteners include screws, straps, inserts, anchors, wedge clamps, seismic restraints

Range of variables

• services include overhead, underground, temporary
• service components include supports, enclosures, raceways, conduit, meter sockets, panels, service mast, point of attachment
• service conductors include wire, cables, conductors
• fasteners include screws, straps, inserts, anchors, wedge clamps, seismic restraints
• grounding electrodes include rods, plates, clamps, copper conductor
• metering equipment includes meter sockets, CTs, VTs, enclosures

Range of variables

• three-phase services include temporary service, overhead, underground, single and multiple metering service components include: supports, enclosures, raceways, conduit, meter sockets, panels, service mast, point of attachment
• service conductors include wire, cables, conductors
• fasteners include screws, straps, inserts, anchors, wedge clamps, seismic restraints

Range of variables

• information includes: inspection report, log books, manufacturers’ manuals, standard operating procedures
• field assessments include sensory inspections, technical inspections
• diagnostic and test equipment includes: multimeters, voltage testers, ammeters, power quality analyzers, thermographic imaging devices, insulation resistance testers

Range of variables

• information includes where and when problem occurred, has problem happened before, is it intermittent or consistent in nature, have any changes recently been made to the system, associated systems or building, latest inspection report, log books, manufacturers’ manuals, standard operating procedures
• field assessments include sensory inspections, technical inspections
• diagnostic and test equipment includes: multimeters, voltage testers, ammeters, power quality analyzers, thermographic imaging devices, phase rotation meters, insulation resistance testers

Task B-8 Installs, services and maintains protection devices

Task descriptor

Overcurrent protection devices provide protection against overloads and short circuits to service entrance, feeder and branch circuit conductors, and equipment. Ground fault protection devices provide protection against shock and current leakage and are usually used in conjunction with overcurrent devices. Arc fault protection devices provide protection from the effects of arc faults by de-energizing the circuit when an arc fault is detected. These devices may also have overcurrent protection for the circuit. Surge protection devices prevent transient voltages that originate outside from entering into the whole system.

For the purpose of this standard, installation includes both new installations and upgrading of systems by removing and replacing components.

Construction electricians service overcurrent, ground fault, arc fault and surge protection devices by troubleshooting, diagnosing faults, replacing devices and repairing them. They also perform maintenance on these devices to ensure they are in good operating condition.

Range of variables

• enclosures include CSA/National Electrical Manufacturers’ Association (NEMA) classification, hazardous locations (as defined by Markings of Section 18 of CEC)
• overcurrent protection devices include: fuses, breakers, relay protection
• hardware include sbolts, screws, brackets, stand-offs, cabling, transition pieces
• documentation includes as-builts, schematics, panel schedules, log sheets, drive drawings, shop drawings

Range of variables

• overcurrent protection devices include: fuses, breakers, relay protection
• required documentation includes as-builts, schematics, panel schedules, log sheets, drive drawings, shop drawings

Range of variables

• ground fault protection devices include: ground fault circuit interrupter (GFCI) receptacle, breaker
• arc fault protection devices include: combination-type arc fault circuit interrupter (AFCI) branch outlet devices, combination-type AFCI breakers
• surge protection devices include: metal oxide varistor (MOV), zener diodes, thyristors
• hardware include sbolts, screws, brackets, stand-offs, cabling, transition pieces, boxes
• documentation includes as-builts, schematics, panel schedules, log sheets, equipment specifications, shop drawings

Range of variables

• ground fault protection devices include: GFCI receptacle, breaker
• arc fault protection devices include: combination-type AFCI branch outlet devices, combination-type AFCI breakers
• surge protection devices include MOV, zener diodes, thyristors
• documentation includes as-builts, schematics, panel schedules, log sheets, equipment specifications, shop drawings

Range of variables

• information includes: where and when problem occurred, has problem happened before, is it intermittent or consistent in nature, have any changes recently been made to the system, associated systems or building, latest inspection report, log books, manufacturers’ manuals, standard operating procedures
• field assessments include sensory inspections, technical inspections
• diagnostic and test equipment includes: multimeters, voltage testers, ammeters, power quality analyzers, thermographic imaging devices, insulation resistance testers

Task B-9 Installs, services and maintains power distribution equipment

Task descriptor

Distribution equipment distributes power using feeder circuits for electrical systems and equipment. This equipment allows for safe utilization of electricity.

For the purpose of this standard, installation includes both new installations and upgrading of systems by removing and replacing components, and high-voltage distribution equipment is covered in Task B-14.

Construction electricians service distribution equipment by troubleshooting, diagnosing faults and repairing them. They also perform maintenance on the equipment to ensure it is in good operating condition.

Range of variables

• power distribution equipment includes: panels, sub-panels, power distribution centres (PDC), switchboards, breakers, fuses, disconnects, racking equipment, CTs, VTs, busbars, splitters, MCCs, transfer switches
• enclosures include: CSA/NEMA type designation, hazardous locations (as defined by Markings of Section 18 of CEC)
• fasteners include screws, straps, inserts, anchors, wedge clamps, seismic restraints

Range of variables

• power distribution equipment includes: panels, sub-panels, PDCs, switchboards, breakers, fuses, disconnects, racking equipment, CTs, VTs, busbars, splitters, MCCs, transfer switches
• enclosures include CSA/NEMA type designation, hazardous locations (as defined by Markings of Section 18 of CEC)
• considerations include load, voltage ratings, required circuit capacity

Range of variables

• information includes: where and when problem occurred, has problem happened before, is it intermittent or consistent in nature, have any changes recently been made to the system, associated systems or building, latest inspection report, log books, manufacturers’ manuals, standard operating procedures
• field assessments include sensory inspections, technical inspections
• diagnostic and test equipment includes: multimeters, voltage testers, ammeters, power quality analyzers, thermographic imaging devices, phase/motor rotation meters, insulation resistance testers

Range of variables

• power distribution equipment includes: panels, sub-panels, PDCs, switchboards, breakers, fuses, disconnects, racking equipment, CTs, VTs, busbars, splitters, MCCs, transfer switches

Task B-10 Installs, services and maintains power conditioning, uninterruptible power supply (UPS) and surge suppression systems

Task descriptor

Power conditioning systems include capacitors, harmonic mitigating transformers and saturation transformers, and are used to provide a smooth sinusoidal alternating current (AC) waveform thereby delivering a voltage of a constant level and power factor characteristics that enable load equipment to function as designed.

For the purpose of this standard, installation includes both new installations and upgrading of systems by removing and replacing components. Also, surge suppression systems refer to embedded devices within the power conditioning or UPS system.

Construction electricians service power conditioning, UPS and surge suppression systems by troubleshooting, diagnosing faults and repairing them. They also perform maintenance to ensure these systems are in good operating condition.

Range of variables

• conditions include harmonics, power factor correction, transient voltages and current
• components include batteries, transformers, capacitors, shunt coils, diodes, synchronous condensers (motors) and filters
• fasteners include screws, straps, inserts, anchors, wedge clamps, seismic restraints

Range of variables

• power factor correction equipment includes: synchronous condensers (motors), capacitors, inverters (renewable energy)
• equipment used to reduce harmonics includes: passive and active filters, transformers and capacitors
• surge suppression equipment include scapacitors, shunt coils and diodes
• UPS equipment include sonline, offline, maintenance bypass and static bypass, battery systems

Range of variables

• information includes where and when problem occurred, has problem happened before, is it intermittent or consistent in nature, have any changes recently been made to the system, associated systems or building, latest inspection report, log books, manufacturers’ manuals, standard operating procedures
• field assessments include sensory inspections, technical inspections
• diagnostic and test equipment include: battery load testers, multimeters, voltmeters, ammeters, power quality analyzers, oscilloscopes, thermographic imaging devices
• components include batteries, transformers, capacitors, shunt coils, diodes, synchronous condensers (motors) and filters
• cleaning lubricating and adjusting procedures include: cleaning fans and filters, load testing batteries, adjusting cabinets and door seals

Range of variables

• power factor correction equipment includes: synchronous condensers (motors), capacitors, inverters (renewable energy)
• equipment used to reduce harmonics includes: passive and active filters, transformers and capacitors
• surge suppression equipment include scapacitors, shunt coils and diodes
• UPS equipment include sonline, offline, maintenance bypass and static bypass, battery systems

Task B-11 Installs, services and maintains bonding and grounding, and ground fault protection and detection systems

Task descriptor

Bonding and grounding systems are used to protect life from shock and equipment from transient and fault current. Bonding is a path for fault current and keeps everything at the same potential. Grounding is a path for connecting equipment to ground to maintain equal potential. Ground fault protection systems are used to detect electrical current leakage and de-energize. They are also used to detect and indicate the presence of ground fault, as in an ungrounded system.

For the purpose of this standard, installation includes both new installations and upgrading of systems by removing and replacing components.

Construction electricians service bonding and grounding protection systems by troubleshooting, diagnosing faults and repairing them. They also perform maintenance to ensure these systems are in good operating condition.

Range of variables

• grounding electrodes include manufacturers’ (rods, plates, clamps), field assembled (buried copper conductors), in-situ (metallic water pipes, metallic pilings)
• grounding system components include grounding electrodes, grounding conductors, grounding connectors (compression, mechanical and exothermic)
• ground testing equipment includes: ground loop impedance tester, insulation resistance tester
• bonding components include: metallic raceways, cables, grounding bushings, copper or aluminum conductors, connectors, locknuts

Range of variables

• grounding methods are determined by level of voltage
• bonding methods are based on ampacity of conductor, metallic conduits, tubing, raceways and cabletray

Range of variables

• ground fault systems include ground fault protection (solidly grounded systems), ground fault detection (ungrounded systems)
• ground fault system components include: CTs, resistors, relays, annunciators (horns, panels), indicators (pilot lights), reset buttons, breakers, interconnecting wiring, ground fault sensors (direct, residual or zero sequence)
• fasteners include screws, straps, inserts, anchors, wedge clamps, seismic restraints

Range of variables

• ground fault systems include ground fault protection (solidly grounded systems), ground fault detection (ungrounded systems)
• ground fault system components include: CTs, resistors, relays, annunciators (horns, panels), indicators (pilot lights), reset buttons, breakers, interconnecting wiring, ground fault sensors (direct, residual or zero sequence)

Range of variables

• lightning protection systems include: lightning arrester protection, structure protection
• lightning protection components include: lightning rod (air terminal), intercepting conductors, down conductors, ground electrodes (ground rods), supports, lightning arresters
• fasteners include screws, straps, inserts, anchors, wedge clamps

Range of variables

• lightning protection systems include: lightning arrester protection, structure protection
• lightning protection components include: lightning rod (air terminal), intercepting conductors, down conductors, ground electrodes (ground rods), supports, lightning arresters

Range of variables

• information includes where and when problem occurred, has problem happened before, is it intermittent or consistent in nature, have any changes recently been made to the system, associated systems or building, latest inspection report, log books, manufacturers’ manuals, standard operating procedures
• field assessments include sensory inspections, technical inspections
• diagnostic and test equipment includes: multimeters, voltage testers, ammeters, insulation resistance testers

Task B-12 Installs, services and maintains power generation and conversion systems

Task descriptor

The purpose of generators is to convert kinetic energy into electricity. They can be used when power from the utility is unavailable or the building is isolated from the power grid. DC conversion systems can also be used to convert three-phase AC power to DC power without needing a prime mover, for example 380-volt DC power supplies used in data centres. 

For the purpose of this standard, installation includes both new installations and upgrading of systems by removing and replacing components.

Construction electricians service power generating systems by troubleshooting, diagnosing faults and repairing them. They also perform maintenance to ensure these systems are in good operating condition.

Range of variables

• AC generating systems include single-phase, three-phase, portable, stationary, transfer methods (manual or automatic)
• AC generating system components include: transfer switch, cables, conductors, overcurrent devices, overload devices, fuel storage, Automatic Voltage Regulator (AVR), isolators, batteries, battery chargers

Range of variables

• AC generating systems include single-phase, three-phase, portable, stationary, transfer methods (manual or automatic)
• AC generating system components include: transfer switch, cables, conductors, overcurrent devices, overload devices, fuel storage, AVR, isolators, batteries, battery chargers

Range of variables

• information includes where and when problem occurred, has problem happened before, is it intermittent or consistent in nature, have any changes recently been made to the system, associated systems or building, latest inspection report, log books, manufacturers’ manuals, standard operating procedures
• AC generating systems include single-phase, three-phase, portable, stationary, transfer methods (manual or automatic)
• field assessments include sensory inspections, technical inspections
• diagnostic and test equipment includes: multimeters, voltage testers, ammeters, oscilloscope, power quality analyzers, high pot tester, thermographic imaging devices, phase rotation meters, insulation resistance testers, ground loop tester
• AC generating system components include: transfer switch, cables, conductors, overcurrent devices, overload devices, fuel storage, AVR, isolators, batteries, battery chargers
• service procedures include cleaning cooling fans, adjusting belt tensioners, cleaning switches

Range of variables

• AC generating systems include single-phase, three-phase, portable, stationary, transfer methods (manual or automatic)
• AC generating system components include: transfer switch, cables, conductors, overcurrent devices, overload devices, fuel storage, AVR, isolators, batteries, battery chargers

Range of variables

• DC generating and conversion systems include: portable, stationary, transfer methods (manual or automatic)
• DC generating and conversion system components include transfer switch, prime mover, cables, conductors, overcurrent devices, overload devices, fuel storage, solid state rectifiers, transformers, silicone controlled rectifiers (SCRs), insulated gate bipolar transistors (IGBTs)

Range of variables

• DC generating and conversion systems include: portable, stationary, transfer methods (manual or automatic)
• DC generating system and conversion components include transfer switch, prime mover, cables, conductors, overcurrent devices, overload devices, fuel storage, solid state rectifiers, transformers, SCRs, IGBTs
• DC generators include series, shunt, compound, portable, stationary

Range of variables

• information includes where and when problem occurred, has problem happened before, is it intermittent or consistent in nature, have any changes recently been made to the system, associated systems or building, latest inspection report, log books, manufacturers’ manuals, standard operating procedures
• field assessments include sensory inspections, technical inspections
• diagnostic and test equipment includes: multimeters, voltage testers, ammeters, oscilloscopes, high pot testers, thermographic imaging devices, insulation resistance testers, ground loop testers
• DC generating and conversion systems include: portable, stationary, transfer methods (manual or automatic)
• DC generating and conversion system components include: transfer switch, brushes, prime mover, cables, conductors, overcurrent devices, overload devices, fuel storage, solid state rectifiers, transformers, SCRs, IGBTs
• service procedures include cleaning cooling fans, adjusting belt tensioners, adjusting and setting brushes, cleaning switches

Range of variables

• DC generating and conversion systems include: portable, stationary, transfer methods (manual or automatic)
• DC generating and conversion system components include transfer switch, prime mover, cables, conductors, overcurrent devices, overload devices, fuel storage, solid state rectifiers, transformers, SCRs, IGBTs
• DC generators include series, shunt, compound, portable, stationary

Task B-13 Installs, services and maintains renewable energy generating and storage systems

Task descriptor

Alternative and renewable energy generation systems can be used to supplement power when power from the utility is unavailable or the building is isolated from the power grid. These systems can also feed energy back to the power grid. For the purpose of this standard, alternative systems are considered non- utility systems. Renewable energy systems are systems such as solar, wind, hydro or tidal powered that use renewable sources of energy. Energy storage systems can also be used independently of renewable energy generating systems.

Construction electricians install service alternative and renewable energy systems by troubleshooting, diagnosing faults, and repairing them. They also perform maintenance to ensure alternative and renewable energy systems are in good operating condition.

For the purpose of this standard, installation includes both new installations and upgrading of systems by removing and replacing components.

Range of variables

• renewable energy systems and components include: fuel cells, wind turbines, photovoltaic modules, hydrokinetic, geothermal, hydraulic turbine, tidal
• renewable energy system connections include: grid dependent and grid independent (stand-alone)
• control system components include: transfer switches, sun-tracking systems, batteries, charge controller, load bank, inverters with anti-islanding capability
• fasteners include screws, straps, inserts, anchors, wedge clamps, seismic restraints
• energy storage system includes: pumped hydro, compressed air energy storage, batteries (various technologies)
• energy storage system components include: transfer switches, inverters, isolation disconnects, controls, battery chargers

Range of variables

• renewable energy systems and components include: fuel cells, wind turbines, photovoltaic modules, hydrokinetic, geothermal, hydraulic turbine, tidal
• renewable energy connections include: grid dependent, grid independent (stand-alone)
• control system components include: transfer switches, sun-tracking systems, batteries, charge controller, load bank, inverters with anti-islanding capability
• energy storage system includes: pumped hydro, compressed air energy storage, batteries (various technologies)
• energy storage system components include: transfer switches, inverters, isolation disconnects, controls, battery chargers

Range of variables

• information includes where and when problem occurred, has problem happened before, is it intermittent or consistent in nature, have any changes recently been made to the system, associated systems or building, latest inspection report, log books, manufacturers’ manuals, standard operating procedures
• renewable energy systems and components include: fuel cells, wind turbines, photovoltaic panels, hydrokinetic, geothermal, hydraulic turbine, tidal
• field assessments include sensory inspections, technical inspections
• diagnostic and test equipment includes: multimeters, voltmeters, ammeters, thermographic imaging devices, irradiation meters, tachometers, oscilloscopes, insulation resistance testers
• lubrication, cleaning and adjusting procedures include: cleaning fans and filters, adjusting cabinets and door seals, cleaning photovoltaic modules, recalibrating tracking system
• control system components include transfer switches, sun-tracking systems, batteries, charge controller, load bank, inverters with anti-islanding capability
• energy storage system includes: pumped hydro, compressed air energy storage, batteries (various technologies)
• energy storage system components include: transfer switches, inverters, isolation disconnects, controls, battery chargers

Range of variables

• renewable energy systems and components include: fuel cells, wind turbines, photovoltaic modules, hydrokinetic, geothermal, hydraulic turbine, tidal
• control system components include transfer switches, sun-tracking systems, batteries, charge controller, load bank, inverters with anti-islanding capability
• energy storage system includes: pumped hydro, compressed air energy storage, batteries (various technologies)
• energy storage system components include: transfer switches, inverters, isolation disconnects, controls, battery chargers

Task B-14 Installs, services and maintains high-voltage systems

Task descriptor

Construction electricians assemble, install, erect and connect equipment, conductors and cables for high-voltage applications (1 000 V AC or 1 060 V DC) such as switchyards, sub-stations, electrical vaults, solar photovoltaic systems, chillers, MCC’s and station ground grids. They use specific equipment, tests and procedures to ensure the work is performed safely due to the inherent hazards regarding high-voltage systems that can cause property damage, serious injury or death.

For the purpose of this standard, installation includes both new installations and upgrading of systems by removing and replacing components.

Construction electricians service high-voltage systems by troubleshooting, diagnosing faults, and repairing them. They also perform maintenance to ensure these systems are in good operating condition.

Range of variables

• high-voltage equipment includes distribution equipment, contactors, motor starters, transformers, MCC, capacitors, reactors, switches, disconnects, rectifiers, reclosers, VTs, CTs, isolating and load breaking switches
• non-current carrying metallic components include: fences, towers, doors, enclosures
• testing equipment includes ground loop impedance tester, insulation resistance tester
• acceptance tests include polarization, station ground grid resistance, high pot, phasing, functionality, timing, current injection
• testing standards include manufacturer, Institute of Electrical and Electronics Engineers (IEEE), North American Electrical Testing Association (NETA), AHJ
• documentation includes as-builts, schematics (AC, DC), drive drawings, shop drawings, single-line drawings

Range of variables

• high-voltage equipment includes distribution equipment, contactors, motor starters, transformers, MCC, capacitors, reactors, switches, disconnects, rectifiers, reclosers, VTs, CTs, isolating and load breaking switches
• documentation includes as-builts, schematics (AC, DC), shop drawings, single-line drawings
• acceptance tests include polarization, ground grid resistance, high pot, phasing, functionality, timing, current injection

Range of variables

• high-voltage cables include armoured cables (with or without shielded conductor), trailing cables, shielded cables, unshielded cables, bus ducts, conduit
• high-voltage cable components include: potheads, stress relief terminations, strapping, bracing, trays, splice kits
• fasteners include screws, straps, inserts, anchors, wedge clamps, seismic restraints

Range of variables

• high-voltage cables include armoured cables (with or without shielded conductor), trailing cables, shielded cables, unshielded cables, bus ducts, conduit
• high-voltage cable components include: potheads, stress relief terminations, strapping, bracing, trays, splice kits

Range of variables

• information includes where and when problem occurred, has problem happened before, is it intermittent or consistent in nature, have any changes recently been made to the system, associated systems or building, latest inspection report, log books, manufacturers’ manuals, standard operating procedures
• field assessments include sensory inspections, technical inspections
• diagnostic and test equipment includes: multimeters, voltage testers, ammeters, power quality analyzers, high pot testers, thermographic imaging devices, phase rotation meters, insulation resistance testers, ground loop impedance tester, arc flash protection equipment, ground straps
• required documentation includes schematic diagrams and drawings, maintenance schedules, single-line diagrams

Range of variables

• high-voltage equipment includes distribution equipment, contactors, motor starters, transformers, MCC, capacitors, reactors, switches, disconnects, rectifiers, reclosers, VTs, CTs
• high-voltage cable components include: potheads, stress relief terminations, strapping, bracing, trays, splice kits
• high-voltage cables include armoured cables (with or without shielded conductor), trailing cables, shielded cables, bus ducts, conduit

Task B-15 Installs, services and maintains transformers

Task descriptor

Construction electricians install extra-low, low and high-voltage transformers to condition or alter voltage and current. Common uses of transformers include signal control, isolation, distribution and transmission.

Transformers are part of the distribution system, not the load. 

For the purpose of this standard, installation includes both new installations and upgrading of systems by removing and replacing components.

Construction electricians service transformers by troubleshooting, diagnosing faults and repairing them. They also perform maintenance to ensure transformers are in good operating condition.

Range of variables

• extra-low voltage transformers include: Class 1 and Class 2 circuits according to the CEC

Range of variables

• extra-low voltage transformers include: Class 1 and Class 2 circuits according to the CEC
• extra-low-voltage transformer components include: casing, core, primary and secondary windings

Range of variables

• low-voltage single-phase transformers include: dry-type, dielectric liquid-filled
• system requirements include input/output voltage, polarities, kVA ratings, conductor size, overcurrent protection, disconnecting means
• tests include insulation test, voltage test, polarity test, turn ratio test

Range of variables

• low-voltage single-phase transformers include: dry-type, dielectric liquid-filled
• low-voltage single-phase transformer components include: oil pumps, ventilation fans, casing, core, primary and secondary windings, bushings, on-line and off-line tap changers, insulating oil/dielectric liquid

Range of variables

• low-voltage three-phase transformers include: dry-type, dielectric liquid-filled
• system requirements include input/output voltage, polarities, kVA ratings, conductor size, overcurrent protection, disconnecting means
• tests include: insulation test, voltage test, polarity test, turn ratio test, thermographic test

Range of variables

• low-voltage three-phase transformers include: dry-type, dielectric liquid-filled
• low-voltage three-phase transformer components include: oil pumps, ventilation fans, casing, core, primary and secondary windings, bushings, on-line/off-line manual and automatic tap changers, insulated oil/dielectric liquid
• winding configurations include wye-wye, open-wye, wye-delta, delta-wye, open-delta, delta-delta, zig‑zag

Range of variables

• high-voltage transformers include dry-type, dielectric liquid-filled
• system requirements include input/output voltage, polarities, kVA ratings, conductor size, overcurrent protection
• tests include insulation test, voltage test, high-pot test, oil analysis test, turn ratio test, thermographic test

Range of variables

• high-voltage transformers include dry-type, dielectric liquid-filled
• high-voltage transformer components include: oil pumps, ventilation fans, casing, core, primary and secondary windings, desiccant breather, buchholz relay, bushings, dielectric liquid, on-line/off-line manual and automatic tap changers, oil temperature/pressure/ level gauges, phase indicators
• winding configurations include wye-wye, open-wye, wye-delta, delta-wye, open-delta, delta-delta, zig-zag

Range of variables

• information includes where and when problem occurred, has problem happened before, is it intermittent or consistent in nature, have any changes recently been made to the system, associated systems or building, latest inspection report, log books, manufacturers’ manuals, standard operating procedures
• field assessments include sensory inspections, technical inspections
• diagnostic and test equipment includes: multimeters, megohmmeters, dielectric oil testing equipment, voltage testers, thermographic imaging devices, power quality analyzers, turn ratio meters, arc flash protective equipment, temporary protective ground
• cleaning and adjustment procedures include: adjusting/changing taps, inspecting of terminations, cleaning/replacing filters, cleaning cooling fans, checking external metal case (including external latching system) to prevent contamination and access, cleaning insulators, vacuuming and cleaning windings

Range of variables

• transformers include extra-low-voltage, dry-type, dielectric liquid-filled
• transformer components include: oil pumps, ventilation fans, casing, core, primary and secondary windings, desiccant breather, buchholz relay, bushings, dielectric liquid, on-line/off-line manual and automatic tap changers, oil temperature/pressure/ level gauges, phase indicators

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