NCCER Wireways, Raceways & Fittings Practice Test

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Question: 1 / 20

What is the acceptable screw grip depth in relation to the screw's length?

1/8 to 1/4

1/4 to 1/3

The correct choice indicates that the acceptable screw grip depth should fall within the range of 1/4 to 1/3 of the screw's total length. This range is important because it ensures adequate engagement of the screw with the materials being fastened, providing sufficient holding power while preventing material damage.

A grip depth that is too shallow may lead to a weak connection, increasing the likelihood of joint failure or loosening over time. Conversely, a grip depth that is too deep can risk damaging the material or affect the screw's performance. The specified range allows for optimal balance and effectiveness, aligning with industry standards for securing electrical equipment or components within wireways, raceways, and fittings. In practical applications, following this guideline helps maintain the integrity of installations and enhances safety.

1/3 to 1/2

1/2 to 2/3

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