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IEC YEAR 4 FINAL EXAM STUDY WITH CORRECT
ANSWERS 2024 LATEST UPDATE.
A branch circuit is supplying a single hermetic refrigerant motor-compressor for an air conditioning unit. The hermetic refrigerant motor-compressor rated-load current is 18 amperes. If a 30-ampere fuse will not start the motor-compressor, the maximum rating of the branch-circuit short-circuit and ground-fault protective device may be increased to ___.
Select one:
- 45 amps
- 35 amps
- 50 amps
- 40 amps - ANSWER✅✅d. 40 amps
Determine the minimum copper THHN conductor size required to connect a 15 KVAR, 480-volt, three-phase capacitor bank to a 50 hp, three-phase motor.
Select one:
- 10 AWG
- 14 AWG
- 12 AWG
- 8 AWG
- 6 AWG - ANSWER✅✅a. 10 AWG
The wiring of an outdoor sign that is portable or mobile and is in a wet location shall be ___.
Select one:
- protected by a 20-ampere overcurrent protective device
- provided with ground-fault circuit-interrupter protection for personnel
- provided with factory-installed ground-fault circuit-interrupter protection for personnel
- none of the these - ANSWER✅✅c. provided with factory-installed ground-fault circuit-
interrupter protection for personnel The maximum number of 15-amp receptacles permitted on a freestanding office partition is
___. 1 / 3
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Select one:
- 6
- 13
- 2
- 10 - ANSWER✅✅b. 13
Conductors that supply one or more arc welders shall be protected by an overcurrent device rated or set at not more than ___% of the conductor ampacity.
Select one:
- 70
- 200
- 125
- 50
- 80 - ANSWER✅✅b. 200
For PV systems, conductor ampacities must be correct if installed in ambient temperatures exceeding ___°F.
Select one:
- 83
- 78
- 71
- 86 - ANSWER✅✅d. 86
A disconnecting means shall be provided for all ungrounded conductors derived from a stationary battery system with a voltage over ___ volts dc.
Select one:
- 100
- 60
- 50
- 30 - ANSWER✅✅b. 60 2 / 3
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Automatic transfer switches (ATS) for emergency systems shall be electrically operated and ___ held.
Select one:
- mechanically
- manually
- automatically
- pneumatically
- electrically - ANSWER✅✅a. mechanically
The optional standby system wiring ___ be permitted to occupy the same raceways, cables, boxes, and cabinets with other general wiring.
Select one:
- shall
- shall not - ANSWER✅✅a. shall
When emergency system power generators are out of service for major maintenance or repair, ___ shall be available.
Select one:
- utility power
- a temporary or portable alternate source
- a wind powered source
- a solar powered source
- any of these - ANSWER✅✅b. a temporary or portable alternate source
A typical standby system ATS ___.
Select one:
- transfers the electrical load to the generator when the normal source fails
- disconnects the normal power source connections when the normal power source fails
- signals the generator to stop when the normal power source is restored
- transfers the load back to the normal power source when the normal source is restored
- all of these - ANSWER✅✅e. all of these
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