In walls or ceilings of combustible material, the box set back from the finished surface must be ____ inch.

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Multiple Choice

In walls or ceilings of combustible material, the box set back from the finished surface must be ____ inch.

Explanation:
The important idea here is how the electrical box sits relative to the final wall surface when it’s installed in a wall or ceiling made of combustible material. In such cases, the box must be flush with the finished surface, meaning there is zero inch set-back. Why flush? If the box were recessed behind the finished surface, the faceplate and device would not sit neatly against the wall, which can create gaps, misalignment, and mounting problems. A zero set-back also helps ensure the wall finish (drywall, plaster, etc.) can be applied smoothly and the cover plate can be installed securely, meeting listing requirements for installations in combustible materials. The other options imply the box would sit farther back from the finished surface, which would complicate finishing the wall, may leave visible gaps around the device, and can lead to improper mounting or noncompliance with the specified installation in combustible walls.

The important idea here is how the electrical box sits relative to the final wall surface when it’s installed in a wall or ceiling made of combustible material. In such cases, the box must be flush with the finished surface, meaning there is zero inch set-back.

Why flush? If the box were recessed behind the finished surface, the faceplate and device would not sit neatly against the wall, which can create gaps, misalignment, and mounting problems. A zero set-back also helps ensure the wall finish (drywall, plaster, etc.) can be applied smoothly and the cover plate can be installed securely, meeting listing requirements for installations in combustible materials.

The other options imply the box would sit farther back from the finished surface, which would complicate finishing the wall, may leave visible gaps around the device, and can lead to improper mounting or noncompliance with the specified installation in combustible walls.

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