Electrician Red Seal · Question
A separately derived AC system, such as the secondary of a 600V to 120/208V transformer, must be grounded if the system can supply:
CEC Rule 10-204(1)(a) mandates that a separately derived AC system must be grounded if the system can be so connected that the circuit conductors can supply a l
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Question: A separately derived AC system, such as the secondary of a 600V to 120/208V transformer, must be grounded if the system can supply:
Answer options:
- any load greater than 1000 VA. ✅ a circuit at 150 volts-to-ground or less.
- a load to a building or structure.
- any 3-phase load.
Correct answer: a circuit at 150 volts-to-ground or less.
Explanation: CEC Rule 10-204(1)(a) mandates that a separately derived AC system must be grounded if the system can be so connected that the circuit conductors can supply a load at 150 volts-to-ground or less. This is a key rule for establishing a new grounded reference for safety and system operation.
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