HOLT Electricians Practice Exam

What is the required recess depth for metal plugs or plates used with nonmetallic boxes?

1. ¼ inch

2. ½ inch

3. ⅛ inch

4. 3/8 inch

The correct answer is: ¼ inch

The correct recess depth for metal plugs or plates used with nonmetallic boxes is ¼ inch. This standard ensures that the plugs or plates fit properly without risking any damage to the nonmetallic box or creating potential safety hazards. A recess depth of ¼ inch provides sufficient space for the metal fittings, allowing for a secure installation while maintaining proper electrical clearances. If the depth were to be greater than this, it might compromise the integrity of the box or interfere with the electrical connections, leading to functionality issues or increased safety risks. Similarly, a lesser depth would not accommodate the metal plugs or plates adequately, potentially resulting in improper fit or voids that could cause electrical failures. Understanding these dimensions is crucial for compliance with safety standards when installing electrical components.