For old work (finished) installations, boxes used for wiring devices such as switches and receptacles must provide ? support.

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Multiple Choice

For old work (finished) installations, boxes used for wiring devices such as switches and receptacles must provide ? support.

Explanation:
In old-work installations, the box that holds a switch or receptacle must be securely anchored to the surrounding structure so the device can withstand the use and weight of the wiring without moving or pulling out. The term substantial here means the box is firmly attached and able to support the device and its stress during plugging, unplugging, and normal operation, which is essential for safety and durability. Temporary or decorative support wouldn’t keep the box stable, and no support at all would be unsafe, so the correct choice is substantial.

In old-work installations, the box that holds a switch or receptacle must be securely anchored to the surrounding structure so the device can withstand the use and weight of the wiring without moving or pulling out. The term substantial here means the box is firmly attached and able to support the device and its stress during plugging, unplugging, and normal operation, which is essential for safety and durability. Temporary or decorative support wouldn’t keep the box stable, and no support at all would be unsafe, so the correct choice is substantial.

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