January 7, 2013 - On December 21, UL officially notified us (Pentair/Tyco) that our system 1850 MI cable would be re-classified as a UL/ULc fire rated cable. Our FHIT (UL on line fire resistive directory is now called FHIT - System 1850).
This listing comes after an exhaustive testing procedure to confirm that MI cables do not exhibit the failure characteristics that we discovered with cable and conduit systems. The new information is available online from UL's website... See link below. We have a full UL and ULc approval for all MI cables and all MI configurations.