After doing some research and thanks to Don we have the CPSC suggestion, I find that based on 426.28 the mandatory word "shall" pops up and it looks like we will need GFPE for snow melting equipment. And back to heat tracing, I'll allow GFCI protection for heat tapes as used on mobile homes but that's it. I mean, where's the CPSC when you are in court defending the NEC?
