National Electrical Installation Standards

Standards as High as Your Own

?
Wednesday, June 22, 2022

Question:

Hello Code Friends!

Regarding CQD of Monday, May 23, 2022, about pan-head screws: There are two types of screws that look alike - pan-head and binder-head. For a long time, I wondered what was the difference. Binder-head screws are designed for electrical wiring. They have a ridge under the head, to keep wire from being squeezed out when the screw is tightened. The bottom of the head on pan-head screws is flat, so they are not good for electrical wiring. Whether they are code-compliant is a different matter.

See you at the NFPA conference.

Jeff Goldsmith, P.E.

A

Answer:

Hi Jeff,

Always good to hear from you. We appreciate the follow-up information about screws with wire-binding capabilities. It's helpful for the CQD readers. Sheet metal screws are generally not compliant. Section 250.8(5) and (6) do specifically address thread forming machine screws and what is acceptable for connections of grounding and bonding conductors. Thanks again for the follow-up.

ABOUT CQD: The Code Question of the Day (CQD) is NECA and ELECTRICAL CONTRACTOR Magazine’s flagship National Electrical Code (NEC®) public forum for the industry, sponsored by EATON. The daily distribution of Q&A generates a lively dialogue and shares relative Code-based practical responses.

SUBMIT YOUR CODE QUESTION: Click here to submit a question to for inclusion in an upcoming edition of the Code Question of the Day, or email codequestion@necanet.org

CHARLIE TROUT: Charles M. Trout, better known as Charlie, was a nationally known NEC® expert and author. He served on several NEC® technical committees and is past chairman of CMP-12. In 2006 Charlie was awarded the prestigious Coggeshall Award for outstanding contributions to the electrical contracting industry, codes and standards development, and technical training. Even though Charlie passed away in October of 2015, his work continues in spirit. NECA continues to maintain this question forum for its many subscribers in memory and recognition of all his significant contributions to making the NEC what it is today.

NECA STANDARDS: NECA publishes the National Electrical Installation Standards™ (NEIS™), a series of ANSI-approved performance and quality standards for electrical construction. NEIS can be purchased in the NECA Store in three formats: a printed or PDF download of a standard or, as an annual subscription service.

NECA SAFETY PRODUCTS & PUBLICATIONS: NECA produces electrical safety publications and products for the industry including jobsite safety guides, handbooks and resource kits. View a full listing of available resources and products »

IMPORTANT NOTICE: Unless the question requests a response based on a specific edition, all answers are based on the latest edition of NFPA 70® National Electrical Code®.

This correspondence is not a formal interpretation of the NEC® and any responses expressed to the questions are opinions and do not necessarily represent the official position of NECA, NFPA, the NEC Correlating Committee any Code-making panel or other electrical technical committee. In addition, this correspondence is neither intended, nor should it be relied upon, to provide professional consultation or services. 

UPDATE YOUR SUBSCRIPTION PREFERENCES: Subscribe or Unsubscribe from this list.