Which of the following disconnecting means is permitted for a 240-volt, single-phase water heater?

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Multiple Choice

Which of the following disconnecting means is permitted for a 240-volt, single-phase water heater?

Explanation:
The main idea is that the disconnecting means for a 240 V single‑phase water heater must be readily accessible and capable of interrupting both hot conductors at the same time. A water heater is a fixed appliance, so the disconnecting means can be a listed disconnect switch located at or near the heater, or a listed circuit breaker in the panel (or a separately mounted listed disconnect) serving the heater. As long as the device is two‑pole (or tied to simultaneously disconnect both hots), properly rated for the current, and within sight and accessible, either option is permitted. This is why both I and II are acceptable.

The main idea is that the disconnecting means for a 240 V single‑phase water heater must be readily accessible and capable of interrupting both hot conductors at the same time. A water heater is a fixed appliance, so the disconnecting means can be a listed disconnect switch located at or near the heater, or a listed circuit breaker in the panel (or a separately mounted listed disconnect) serving the heater. As long as the device is two‑pole (or tied to simultaneously disconnect both hots), properly rated for the current, and within sight and accessible, either option is permitted. This is why both I and II are acceptable.

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