About Underwriters Laboratories

Underwriters laboratories Inc., (UL) is the trusted source for product compliance across the globe. Jurisdictional authorities, government agencies, insurance representatives and consumers alike rely on the UL mark on products and systems to indicate a compliance with internationally recognized Standards for Safety.

UL's role in Lightning Protection

UL has a large number of trained lightning protection field representatives across the United States. Their Master Label Program for lightning protection requires periodic factory testing and inspection of system components, along with field inspection counterchecks of completed installations. The program requires an installer to comply with their internationally recognized Standards for lightning protection components and systems. UL's field representatives countercheck compliance with these Standards.

How to Make Sure your Lightning Protection System Complies with the UL

• Make certain that your installer is Listed by the Underwriters Laboratories and that a Master Label application is submitted to UL for your installation.
  
  
• When you request a Master Label for your system, your installer will ask you to sign the owner's statement on the Master Label application form. This should be done before the installer submits the Master Label application to Underwriters Laboratories for issuance of the Label. Make sure you receive the Master Label from the installer and then place it on the protected structure as requested.
  

Buildings that are changed structurally or provided with additions can be reexamined under UL's Reconditioned Lightning Protection Program. Under this program, the entire system must comply with the current UL Standards.