NEC Commercial Electrical Practice Test

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Prepare for the NEC Commercial Electrical Test with multiple choice questions each with detailed explanations. Study efficiently to excel in your exam!

Practice this question and more.

What must be done if a luminaire weighs more than the specified limit for outlet boxes?

It can be supported by more than one box
It must be removed and not used
It must be independently supported
It can be supported with additional cables

The correct answer is: It must be independently supported

When a luminaire exceeds the specified weight limit for outlet boxes, it is crucial that the fixture is independently supported. This requirement ensures that the weight of the luminaire does not rely on the outlet box, which is not designed to bear heavy loads beyond its specified limit. Independent support typically involves using brackets, chains, or other hardware that anchors directly to a structural element of the building, such as a ceiling joist or beam. This approach prevents potential failures that could arise from placing too much stress on the outlet box, which might lead to electrical hazards or damage to the fixture itself. Proper independent support also complies with safety regulations to ensure that the installation is secure and minimizes risks associated with heavy fittings.