Residential Construction Academy: House Wiring (MindTap Course List)
Residential Construction Academy: House Wiring (MindTap Course List)
4th Edition
ISBN: 9781285852225
Author: Gregory W Fletcher
Publisher: Cengage Learning
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Chapter 2, Problem 1RQ

Name the size of machine screw that is used to secure switches and receptacles to device boxes. (Objective 2-8)

Expert Solution & Answer
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To determine

The size of the machine screw that is used to secure switches and receptacles to device boxes.

Explanation of Solution

Introduction:

Metal device boxes are widely used in residential wiring, even though non-metallic device boxes have become the best choice across the country. The standard metal device box has a 3×2 -inch opening and can vary in depth from 1½ to 3½ inches. The most common metal device box used is the 3×2×3½ -inch box because it can contain several wires and devices.

The holes are designed to mount the device and accommodate screws of a switch or receptacle andlock the device to the box. The holes are tapped for a 632 screw size. At the bottom of the box, there is a tapped hole that accommodates a 1032 grounding screw. This screw's shapeis hex headed and green in color, and its function is to attach the circuit's equipment grounding conductor to the metal box.

Conclusion:

Thus, the size of the machine screw that is used to secure switches and receptacles to the device boxes is 632 screw size.

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