Code Q&A: Conductor Size for Class 1 Circuits

Your most pressing National Electrical Code (NEC) questions answered

Q. What is the smallest conductor allowed by the NEC for Class 1 control and signal circuits?

A. Conductors of sizes 18 AWG and 16 AWG installed in a raceway, enclosure, or listed cable are permitted for Class 1 circuit conductors if they don’t supply a load that exceeds the ampacities specified in Table 402.5. Conductors of 14 AWG and larger must not supply loads greater than the ampacities given in 310.15 [725.49(A)]. In additio

Register to view the full article

Register on EC&M and gain access to premium content, including this article and much more.

Hide comments

Comments

  • Allowed HTML tags: <em> <strong> <blockquote> <br> <p>

Plain text

  • No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.
Publish