Practice Quiz

Red Seal Construction Electrician - Question List

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26.
A consumer’s service conductors are to be routed inside the building for the final portion of the run. Which of the following is acceptable?
  1. The conductors are routed through a crawlspace less than 1.8 m high, built of wood framing.
  2. The conductors are direct buried below a 25mm concrete slab.
  3. The conductors are installed in rigid PVC conduit.
  4. The conductors are directly encased by 50mm of concrete.
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27.
When terminating the service conductor neutral wire from a three phase 120/208 service, when is the neutral wire grounded?
  1. At the utility transformer only.
  2. At the consumer’s service equipment only.
  3. At every utilization point in the system.
  4. The neutral wire must be isolated from ground.
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28.
What is the primary benefit of an impedance grounded service?
  1. It reduces the potential for ground faults.
  2. It reduces touch potential in the area around the service equipment.
  3. It provides single phase power in a 3-phase delta system.
  4. It reduces the maximum available ground fault current.
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29.
What is not a feature of the Edison 3-wire system?
  1. The consumer has access to 120V and 240V circuits.
  2. The neutral wire automatically balances the phase voltages.
  3. The system uses less wire and thus is more cost-effective.
  4. The system only requires one phase of the utility supply.
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30.
What is the primary purpose of an overcurrent device?
  1. To limit the flow of current in a circuit.
  2. To interrupt the flow of current during an overload condition.
  3. To act as a control device for a circuit.
  4. To interrupt the flow of current in the event of a short circuit.
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