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 is the maximum weight for luminaries that can be supported by the screw shell of a lamp-holder?

4 pounds
6 pounds
8 pounds
10 pounds

The correct answer is: 6 pounds

The maximum weight that can be supported by the screw shell of a lamp-holder is six pounds. This limit is established by the National Electrical Code (NEC) to ensure safety and reliability in electrical installations. When hanging or mounting luminaires, it is essential to consider the load-bearing capacity of the lamp-holder to prevent accidental failure or damage. If luminaires exceed this weight limit, they should be supported by an independent structure rather than solely relying on the lamp-holder. Understanding this regulation helps electricians and builders make informed decisions about fixture installation and promotes safe electrical practices in commercial environments.