Electrician Red Seal · Question
Under the CEC, where must a metal water piping system be bonded to ground if it enters a building from an exterior source?
CEC Rule 10-406(1) requires that where a metal water piping system is connected to a non-electrical source, it must be bonded to the grounding conductor as clos
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Question: Under the CEC, where must a metal water piping system be bonded to ground if it enters a building from an exterior source?
Answer options:
- At the main water shutoff valve. ✅ As close as practicable to the point where it enters the building.
- At the hot water tank connection.
- It only needs to be bonded if used as a grounding electrode.
Correct answer: As close as practicable to the point where it enters the building.
Explanation: CEC Rule 10-406(1) requires that where a metal water piping system is connected to a non-electrical source, it must be bonded to the grounding conductor as close as practicable to the point of entry to the building. This prevents potential differences between the piping and the electrical system ground.
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