Journeyman Electrician Practice Exam

Which of the following is true about the installation of a closure plate in panelboards?

1. A closure plate must be listed for the specific purpose by the manufacturer.

2. A closure plate can be any material as long as it securely fits.

3. Closure plates do not need to be listed as long as they cover the opening.

4. A closure plate can be made from wood or plastic materials.

The correct answer is: A closure plate must be listed for the specific purpose by the manufacturer.

A closure plate must be listed for the specific purpose by the manufacturer to ensure that it meets safety and performance standards. This requirement is in place because closure plates are critical components in electrical panelboards, designed to maintain the integrity and safety of the electrical enclosure. A listed closure plate has been tested and certified to ensure it can effectively prevent accidental contact with live components and can withstand the conditions it will face in the panelboard environment. Using a closure plate that is specifically listed by the manufacturer helps guarantee it will properly fit and secure the opening as intended. This regulation is a part of broader safety practices that are enforced in electrical installations to reduce risks, including fire hazards, electric shocks, and other potential safety issues. Other materials or unlisted solutions might not provide the same level of safety or might fail under certain conditions, highlighting the importance of using manufacturer-recommended, listed products in all electrical installations.