In the U.S., electric signs must meet two key standards:
- Installation: Covered by Article 600 of the NFPA 70, National Electrical Code (NEC)
- Product Safety: Covered by UL 48, published by UL Standards & Engagement
What is UL 48?
UL 48 sets safety requirements for electric signs, outline lighting, and neon tubing. Now in its 15th edition, it’s been continuously updated to reflect new technologies and industry practices.
ISA’s Role
ISA has helped shape UL 48 for decades, ensuring the standards support safe and innovative sign design. Consider serving on a UL committee.
Related Standards
- UL 879: Covers sign components
- UL 2161: Covers neon transformers and power supplies
Accessing UL Standards
UL now offers free online viewing of its standards through the UL Shop. Note: Downloads and printing are restricted to page-by-page viewing with free registration.
Need Help?
ISA provides guidance to sign companies on UL compliance. Contact Kenny Peskin, Director of Industry Programs, for support.
MORE INFORMATION
ISA helps develop these standards and can provide sign companies with guidance on how to comply. For more information on UL electric sign issues, contact Kenny Peskin , Director of Industry Programs.