What type of screws should removable covers of conduit boxes be secured with, according to UL 68(1)?

What type of screws should removable covers of conduit boxes be secured with, according to UL 68(1)?

• A. 2-way screws
• B. 1-way screws
• C. 3-way screws
• D. Standard screws

Answer: (B)

Removable covers of conduit boxes should be secured with one-way screws according to UL 68(1). One-way screws, often designed to be installed but not easily removed without a specific tool, provide an effective means of securing covers in a way that prevents unauthorized tampering or accidental disassembly. These screws typically feature a design that allows them to be driven in but makes it difficult for someone to remove them without the proper tools, enhancing the safety and integrity of electrical installations.

Using one-way screws helps maintain the necessary safety standards outlined by UL, which focus on preventing access to live electrical components and maintaining the overall safety of the installation. In contrast, the other types of screws mentioned do not provide the same level of security or are not specified by UL for this particular application, which is crucial for ensuring compliance with electrical safety standards.