Podcast
Questions and Answers
During the process of cutting metal supports to length, what constitutes the most immediate physical hazard?
During the process of cutting metal supports to length, what constitutes the most immediate physical hazard?
- Presence of sharp, unfinished edges (correct)
- Release of harmful ozone gases
- Exposure to arc flash radiation
- Potential contact with unseen surface contaminations
What is the maximum allowable distance between supports for a trade size 103mm PVC conduit installation?
What is the maximum allowable distance between supports for a trade size 103mm PVC conduit installation?
- 2.1 m
- 1.5 m
- 1.8 m (correct)
- 1.2 m
Which circuit diagram exemplifies a Class B fire alarm circuit configuration?
Which circuit diagram exemplifies a Class B fire alarm circuit configuration?
- Diagram B (correct)
- Diagram A
- Diagram D
- Diagram C
In a vehicular traffic area, what is the minimum depth of cover required for direct burial of a high-voltage conductor?
In a vehicular traffic area, what is the minimum depth of cover required for direct burial of a high-voltage conductor?
What is the prescribed minimum clearance between the unguarded live parts of a 14.4 KV transformer and the surrounding fence?
What is the prescribed minimum clearance between the unguarded live parts of a 14.4 KV transformer and the surrounding fence?
What initial checks should be performed immediately after installing a new motor?
What initial checks should be performed immediately after installing a new motor?
Within a fire alarm system, what is the smallest conductor size permitted for use in the integral assembly of four or more conductors?
Within a fire alarm system, what is the smallest conductor size permitted for use in the integral assembly of four or more conductors?
What minimum horsepower (HP) rating is generally required for a Variable Frequency Drive (VFD) connected to a 3-phase motor operating at 575-600V with a Full Load Current (FLC) of 9.0A?
What minimum horsepower (HP) rating is generally required for a Variable Frequency Drive (VFD) connected to a 3-phase motor operating at 575-600V with a Full Load Current (FLC) of 9.0A?
What is the minimum burial depth required for a cable with a metallic sheath, operating at less than 750V, when installed under a driveway?
What is the minimum burial depth required for a cable with a metallic sheath, operating at less than 750V, when installed under a driveway?
What is the smallest conductor size permitted for instrumentation purposes within a cathodic protection system?
What is the smallest conductor size permitted for instrumentation purposes within a cathodic protection system?
When terminating a 250 kcmil aluminum ground conductor to a copper water pipe, what is the correct order of steps?
When terminating a 250 kcmil aluminum ground conductor to a copper water pipe, what is the correct order of steps?
What is the appropriate tightening torque for a 600 kcmil lug and split bolt with a hexagonal head, when using an external drive wrench?
What is the appropriate tightening torque for a 600 kcmil lug and split bolt with a hexagonal head, when using an external drive wrench?
What is the correct burial depth for a grounding plate in a 120/240V system?
What is the correct burial depth for a grounding plate in a 120/240V system?
After a tree of three transformers, each rated at 125 KVA, has one transformer removed due to failure, what is the total remaining KVA?
After a tree of three transformers, each rated at 125 KVA, has one transformer removed due to failure, what is the total remaining KVA?
A three-phase, 50 HP, 575 VAC motor is being installed. What is the approximate ampacity required for the conductors feeding this motor?
A three-phase, 50 HP, 575 VAC motor is being installed. What is the approximate ampacity required for the conductors feeding this motor?
A refrigerator is plugged into a dedicated circuit, but the power fails immediately upon plugging it in. Which of the following is the MOST likely cause of this issue?
A refrigerator is plugged into a dedicated circuit, but the power fails immediately upon plugging it in. Which of the following is the MOST likely cause of this issue?
What is the power density in watts per square meter for a storage warehouse, according to standard electrical guidelines?
What is the power density in watts per square meter for a storage warehouse, according to standard electrical guidelines?
In a balanced 600 V 3-phase system, if the ground fault indicator illuminates for Phase B, what voltage would you expect to measure between Phase A and Phase C?
In a balanced 600 V 3-phase system, if the ground fault indicator illuminates for Phase B, what voltage would you expect to measure between Phase A and Phase C?
What is the minimum size aluminum grounding conductor required for a system with a fault current of 0.02 amps (2/100007)?
What is the minimum size aluminum grounding conductor required for a system with a fault current of 0.02 amps (2/100007)?
A 600V cable with a metal sheath is exposed to vehicular traffic. What is the minimum burial depth required?
A 600V cable with a metal sheath is exposed to vehicular traffic. What is the minimum burial depth required?
What minimum conductor size (AWG) is required to limit the voltage drop to 2% when supplying a 240 V, 25 A load at a distance of 31 meters?
What minimum conductor size (AWG) is required to limit the voltage drop to 2% when supplying a 240 V, 25 A load at a distance of 31 meters?
When determining the service conductor size for a 12-unit apartment building, what demand factor should be applied to loads not located within the individual dwelling units?
When determining the service conductor size for a 12-unit apartment building, what demand factor should be applied to loads not located within the individual dwelling units?
An outdoor damper is at 85% open position based on a 4mA to 20mA control signal. What is the approximate signal reading?
An outdoor damper is at 85% open position based on a 4mA to 20mA control signal. What is the approximate signal reading?
What is the maximum permissible distance between vertical supports for a #3/0 AWG copper wire?
What is the maximum permissible distance between vertical supports for a #3/0 AWG copper wire?
What is the minimum ampacity required for an emergency power supply circuit that serves a 30 A fire pump and a 15 A jockey pump?
What is the minimum ampacity required for an emergency power supply circuit that serves a 30 A fire pump and a 15 A jockey pump?
In a fire alarm system, what condition is indicated when an initiating device (such as a smoke detector) is shorted?
In a fire alarm system, what condition is indicated when an initiating device (such as a smoke detector) is shorted?
What is the maximum allowable distance between supports for a 21mm EMT (Electrical Metallic Tubing) conduit run?
What is the maximum allowable distance between supports for a 21mm EMT (Electrical Metallic Tubing) conduit run?
How many supports are minimally required when both trade size 16mm and trade size 27mm EMT conduits are supported together over a 15-meter distance on the same rack?
How many supports are minimally required when both trade size 16mm and trade size 27mm EMT conduits are supported together over a 15-meter distance on the same rack?
How is an oil-to-air (OAT) switch typically connected in a motor control circuit with a contactor?
How is an oil-to-air (OAT) switch typically connected in a motor control circuit with a contactor?
To what type of AC power source should emergency power be connected?
To what type of AC power source should emergency power be connected?
Which type of low-voltage communication cable is suitable for installation in a plenum space?
Which type of low-voltage communication cable is suitable for installation in a plenum space?
What is the standard CSA configuration type of receptacle typically used for a rooftop maintenance service plug?
What is the standard CSA configuration type of receptacle typically used for a rooftop maintenance service plug?
Under what condition will a motor continuously run in the forward direction?
Under what condition will a motor continuously run in the forward direction?
Which of the following is a primary hazard associated with cutting metal using a grinder?
Which of the following is a primary hazard associated with cutting metal using a grinder?
What is the most appropriate method for enlarging an existing 1-inch hole in a box to a 3-inch hole?
What is the most appropriate method for enlarging an existing 1-inch hole in a box to a 3-inch hole?
An outdoor light remains ON during the daytime. Which of the following is most likely the cause?
An outdoor light remains ON during the daytime. Which of the following is most likely the cause?
What is the minimum disconnect switch size required for a 600 V, 50 HP, 3-phase motor protected by non-time delay (NTD) fuses?
What is the minimum disconnect switch size required for a 600 V, 50 HP, 3-phase motor protected by non-time delay (NTD) fuses?
What is the standard load calculation for an 85 square meter dwelling unit, excluding the basement area?
What is the standard load calculation for an 85 square meter dwelling unit, excluding the basement area?
What is the maximum allowable voltage drop for a 48 VDC photovoltaic system?
What is the maximum allowable voltage drop for a 48 VDC photovoltaic system?
During a routine inspection of a live electrical system, which method is most suitable for detecting potential overheating?
During a routine inspection of a live electrical system, which method is most suitable for detecting potential overheating?
What type of protection is provided by a magnetic across-the-line starter with a holding contact connected in parallel with the start button contacts?
What type of protection is provided by a magnetic across-the-line starter with a holding contact connected in parallel with the start button contacts?
What is the maximum-sized circuit breaker permitted for a 120V mogul-based lighting branch circuit in a commercial mall?
What is the maximum-sized circuit breaker permitted for a 120V mogul-based lighting branch circuit in a commercial mall?
Consider a three-phase grounded system with indicator lamps. If lamp 'B' is out, indicating a ground fault, what is the approximate voltage between phase B and ground?
Consider a three-phase grounded system with indicator lamps. If lamp 'B' is out, indicating a ground fault, what is the approximate voltage between phase B and ground?
What is the FIRST step to undertake during a standard Lockout/Tagout (LOTO) procedure?
What is the FIRST step to undertake during a standard Lockout/Tagout (LOTO) procedure?
In the given circuit, if transistor Q1 fails in the open position, what is the resulting effect on the light?
In the given circuit, if transistor Q1 fails in the open position, what is the resulting effect on the light?
Flashcards
Cable Depth Under Driveway (Metal Sheath, <750V)
Cable Depth Under Driveway (Metal Sheath, <750V)
450mm is the minimum depth.
Minimum Conductor Size for Cathodic Instrumentation
Minimum Conductor Size for Cathodic Instrumentation
14 AWG is the minimum size.
Terminating Al Ground Conductor to Copper Pipe
Terminating Al Ground Conductor to Copper Pipe
Clean, sand down, install clamp, apply compound, then terminate.
WHMIS Symbol for Battery Acid
WHMIS Symbol for Battery Acid
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Minimum Wire Size in Raceway
Minimum Wire Size in Raceway
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Minimum Wire Size Pulled into Raceway
Minimum Wire Size Pulled into Raceway
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Temporary Wiring Changeover
Temporary Wiring Changeover
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Elevated Platform Protection
Elevated Platform Protection
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Warehouse Wattage
Warehouse Wattage
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Phase-to-Phase Voltage
Phase-to-Phase Voltage
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SDS Meaning
SDS Meaning
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Enclosure Type 3
Enclosure Type 3
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Enclosure Type 4
Enclosure Type 4
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A/C Disconnect Distance
A/C Disconnect Distance
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Heater Disconnect Distance
Heater Disconnect Distance
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EXIT Sign Authority
EXIT Sign Authority
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Cutting metal supports hazard
Cutting metal supports hazard
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PVC conduit support spacing
PVC conduit support spacing
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Minimum conductor size in fire alarm systems
Minimum conductor size in fire alarm systems
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Class A GFCI trip current
Class A GFCI trip current
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Reducing harmonics
Reducing harmonics
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Extension cord inspection frequency
Extension cord inspection frequency
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Transformer bonding point
Transformer bonding point
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When to apply Lock-Out procedure
When to apply Lock-Out procedure
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Grinder cutting hazard
Grinder cutting hazard
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Increasing hole size in a box
Increasing hole size in a box
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Outdoor light stays ON
Outdoor light stays ON
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Load for 85m² floor area
Load for 85m² floor area
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Max voltage drop for 48VDC PV system
Max voltage drop for 48VDC PV system
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Overheating detection
Overheating detection
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Bright 'Y' on thermographic image
Bright 'Y' on thermographic image
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Correction factor for 15 conductors
Correction factor for 15 conductors
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Low Voltage Protection
Low Voltage Protection
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Max Breaker for 120V Lighting
Max Breaker for 120V Lighting
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Dielectric Fluid Containment
Dielectric Fluid Containment
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Ground Fault Voltage
Ground Fault Voltage
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Lock Out Tag Out (LOTO)
Lock Out Tag Out (LOTO)
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Minimum Size of Aluminum Ground
Minimum Size of Aluminum Ground
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Minimum Burial Depth for 600V Cable
Minimum Burial Depth for 600V Cable
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4mA to 20mA signal for 85% open
4mA to 20mA signal for 85% open
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Max support distance for #3/0 AWG
Max support distance for #3/0 AWG
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Max support distance for 21mm EMT
Max support distance for 21mm EMT
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Number of EMT conduit supports
Number of EMT conduit supports
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Low voltage communication cable in plenum
Low voltage communication cable in plenum
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Receptacle for rooftop maintenance
Receptacle for rooftop maintenance
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Study Notes
- The minimum insulated temperature of a branch circuit insulated conductor located within 75 mm of a ballast within a ballast compartment is 90c.
- Maximum overcurrent protection for a 12 AWG conductor in a commercial lighting system is 20 amps.
- If a sling is damaged, report it to your supervisor so it can be replaced.
- The maximum ampacity allowed for a bud iuninary is 40 amps.
- The maximum distance for support of a non-metallic sheathed cable is 1.5 m.
- Removing the ELR in a fire alarm system will cause a trouble light to appear.
- If something cannot be found in the electrical code book, the general contractor will make the decision.
- In the kitchen, the minimum distance between the sink and a GFI protected receptacle is 1.5 m.
- In kitchens, the minimum distance between a plug and bathtub or shower is 500 mm.
- Threaded rods support ladder able trays.
- The minimum distance between communication conductor and electric lighting circuit operators at 300 volts is 50 m.
- The minimum distance between communication conductor and electric lighting circuit operators at 347 volts is 600 mm.
- The minimum separation distance between a class 2 circuit contractor and insulated contractor of electric light power operator at 300 V is 50 mm.
- The filling for wire way containing only signal and control conductors is 40%.
- For two EMT conduits (21mm and 27mm) running on common supports, 30 supports are required for a 45m run.
- A 3S enclosure is used in a blast meet freezer.
- CMP communication cable shall be permitted to be run in a plenum air return duct.
- A 3X box enclosure use when corrosive gas is presented.
- Diagram A is correct for a 48 V batteries connection.
- A 4X enclosure is appropriate when installing a photo cell in a car wash.
- There are 38 receptacals in the plan.
- If the voltage is less than 750V, the depth for a cable running under a driveway and having a metal sheath is 600mm.
- 14AWG is the minimum size of conductor in a cathodic system permitted for instrumentation needs.
- The procedure when terminating a 250 kcmil AL ground conductor to a copper water pipe: Clean, apply compound, install clamp and do termination.
- The tightening torque for a 600 kcmil lug and split bolts hexagonal head using an external drive wrench is 113.0 Nm.
- The burial depth for a grounding plate in a 120/240 V system is 600mm.
- B is the correct WHMIS symbol for battery acid.
- The voltmeter reading is 0v.
- The wire size at the point “B” is 14AWG.
- The minimum wire size laid in a raceway 19AWG.
- The minimum wire size that can be pulled into a raceway is 16AWG.
- The size of conductor in an integral assembly of HVAC system is 22AWG.
- There are 3 conductors in PVC conduit at point X.
- Diagram C is correct for transformers.
- With tree transformers in service, and each transformer is 125KVA, after one broken is taken away, the new KVA is 216 KVA.
- NMWU cable can be used with uninsulated bonding wire in a basic care area.
- Temporary wiring can be changed over interconnection to the permanent wiring by special permission.
- For a three phase 50 HP 575 VAC motor, the ampacity for the conductor is 65A.
- If a refrigerator plugs into a dedicated circuit, and when plugged in the receptacle power fails, the cause is likely an AFCI.
- A four meters elevated platform requires an orange pylon for worker protection.
- The appropriate conductor height for a parking lot is 4.0m.
- The box size for straight run 41mm, 53mm and 78 mm conduits is 624mm
- In the motor junction box if one phase conductor is discolored, the termination was not torque properly.
- If a generator hasn't been used in several months and fails after start upon being used again, the cause is lost excitation.
- Holding contact in start/stop control circuit must be in parallel with the start button.
- For a 200HP 3 phase induction motor with SF 1.2, the overload protection setting 240 A.
- For a 200 HP 3 phase induction motor, the NTD fuse should be 500 A.
- The percentage for overload rating if service factor is 1.15 or higher is 125%.
- A1-A2 reverses a motor.
- If fuse 2 is blown, voltmeters will read: V1=0V, V2= 208V, V3=0V, V4=208V.
- The minimum number of stair way risers in dwelling unit to use three-way switch is 4.
- An outdoor dumper with 75% open command from 4mA to 20mA signal reads 16.0 mA.
- A lighting circuit must be used to supply a smoke alarm in a single-family dwelling unit.
- The maximum distance between supports required for trade size 16mm EMT conduit is 1.5m.
- A core drill is used to drill an 8" hole in a concrete slab.
- Reverse armature reverses a compound motor.
- The temperature rating of the cable used in a fire alarm system is 90 C.
- Symbol B represent a limit switch
- An exit sign permits AC and DC power to be installed in the same unit.
- If each battery is 3 V and 30 Ah, the voltage and capacity of the connection is 9 V 60 Ah.
- When cutting metal supports components to length one hazard is sharp edges.
- The maximum distance between supports for trade size 103mm PVC conduit is 2.1m.
- Diagram B represent Class B fire alarm circuit.
- The minimum cover required for a direct burial high voltage conductor in a vehicular area is 1000mm.
- The minimum clearance between unguarded life parts 14.4 KV transformer and the fence near surrounded it is 3.0m.
- On a newly installed motor one should start momentary and check the direction of rotation.
- In a fire alarm system the size of conductor permitted to use for the integral assembly of four or more conductors is 22AWG.
- The minimum horse power (HP) for the VFD if motor has 3 phase, 575(600) V and FLC9.0A is 7.5 HP.
- A600 V 3 Phase transformer 4 wires 120 V secondary winding the bonding attaches to XO.
- An extension cord should inspected before each use.
- A Class A GFCI interrupts circuit at 6 mA.
- The minimum clearance between heated ceiling and any additional wiring located above it is 50 mm.
- The minimum distance of point X, when installing a run of cable tray is 150 mm.
- If in a megger test on wire insulation, the phase that fails to ground will read 0.9 MO
- The maximum setting time for a timer in a sauna is 60 min.
- A reactor is used to reduce harmonics.
- Symbol D is a temperature switch (thermostat).
- The horn will sound 10 second after the motor stop.
- The residuum voltage permitted photovoltaic system is 30 V.
- A Lock-Out procedure must be applied when repairs are being made to the equipment.
- The wattage per square meter for a storage warehouse is 5.
- In 600 V 3 Phase system if the ground fault light for the Phase B came out, the voltage reading between phase A and phase C will be 600.
- 10 AWG conductor is required to limit voltage drop to 2% when feeding 240v 25a load at distance 31m.
- When determine the size of the service conductor in the 12 units apartment, the demand factor for the load not located in the dwelling units is 75%.
- The minimum conductor ampacity for emergency power supply with a fire pump rated 30A and a jokey pump rated at 15 A is 56.25 A.
- Initiating device indicated at 2 closes (shorted) means an alarm condition.
- A float switch control connected to a contactor is in series with a coil.
- Signal A indicate rase load (hoist) slowly.
- Emergency power to 347 V AC power source is connected via a permanent connection.
- The minimum working space required when installing a low voltage MCC is 1.0 M.
- Information for the storage of a hazardous material and chemicals is found on a Safety data sheet.
- Enclosure 3 would be used outside, when exposed to rain and snow?
- Enclosure 3 would be used in an area where it would be hosed down.
- The maximum distance for a disconnecting means for the A/C unit is 3 M.
- The maximum distance for disconnecting means for a central electric heater is 9m within sight.
- A lockable receptacle used for 3 phase 600 V 20 A 3 wires application: L17-30R.
- The National Building Code of Canada presides over the requirements of EXIT signs.
- For 100 A 3 copper conductors used for a service, the minimum size 016 2/100007 of aluminum ground required is #6 AWG.
- A 600 V cable having a metal sheath is exposed to a vehicular traffic, the minimum burial depth required is 600mm.
- An outdoor dumper with 85% open command from 4mA to 20mA signal reads 17.6 mA.
- The maximum distance for vertical supports for #3/0 AWG copper wire is 24.
- The maximum distance for supports for 21mm EMT conduit is 1.50m.
- 10 supports are required when trade size 16mm and trade size 27mm EMT conduits are supported for the distance of 15 M on the same rack.
- FT6 is a low voltage communication cable that would be run in a plenum?
- The CSA configuration type of receptacle is used for a roof top maintenance service plug is 5-20R.
- The minimum temperature rating for a cable that run in an air handling plenum is 60 C.
- The wire rating for the conductors for a 12A fire pump is 15A.
- The maximum size of circuit breaker that maybe used on a HID (120V) lighting system in a commercial building is 40A.
- Bonded metal pool fence at 1.50M
- The ampacity for the thermostat wire is 100%.
- The minimum size of five conductors using for fire alarm system that will be pulled into raceway integral assembly is 22AWG.
- Deviation to the CEC is permitted when special permission is obtained before proceeding with the work.
- The maximum spacing for a warning notice on a cable tray containing high-voltage insulating conductors is10M.
- The maximum weight of a heater that can be hanging from a ceiling mounted box is 23Kg.
- There are 27 switches shown in the plan.
- For a figure where (normally open) NO F is fused, the motor will not run in the reverse direction.
- When cutting metal using a grinder one hazard is sparks.
- Proper torque when terminating two #2/0 wires for lug and split bolt is 43.5 Nm.
- Increasing a 1" hole to 3" requires a hole punch.
- The neutral current is 4A.
- If an outdoor light is not OFF during day time, it is may be the photocell.
- Use a 200A disconnect switch for a 600 V 50 HP 3 phase motor protected by NTD fuse.
- The load for 85m² floor area exclusive is 24,000W for the basement.
- The maximum voltage drop for 48 VDC photovoltaic system is 2.4V.
- For a 120 V, 5 HP DC motor, the circuit breaker size is 60A.
- The minimum wire size RW75 required to feel50 HP, 575 V, squirrel cage motor is 3/0 AWG.
- The maximum size for the time delay fuse feeder protection of 5 HP and 10 HP induction motors 25 A.
- The correction factor for 15 conductors in a raceway using for a nurse call system is 0.7.
- Overheating in a life electrical system is determined by a check for infrared heat with a scanner.
- Overcurrent protection can be rated higher than the panel board rating if more than 90% of the panel board loads is the motor load.
- Thermographic picture of the lighting contactor displays brighter "Y" is because the Contacts of the lighting Contactor are pitted.
- Magnetic across-set-line starter with holding contact connected in parallel with start button contacts is is low voltage protection.
- Largest circuit breaker permitted for 129 V mogul based lighting branch circuit used in a commercial mall is 40A.
- Diagram C represent 24 V battery connection?
- Dielectric liquid-filled electrical equipment containing 23 L of liquid or less in one tank, or 69 L or less in a group of tanks, a metal pan or concrete curbing capable, of collecting and retaining all the liquid of the tank or tanks is required.
- If in a three-phase ground fault indication system lamp "B" is out, the Voltage between phase b and ground is 0V.
- The initial procedure for lock out tag out is is disconnect all energy sources.
- Refer to Figure, if Q1 fails in open position the the Light does not come ON
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