Breakermaster
Member
- Location
- Reisterstown Maryland
I had a CEU student, who happens to be in management of a private electrical contracting firm call me with a question regarding low temperature limitations for the interlocking everyday MC Cable. He works on extremely low temperature freezers. The temperature is usually between 0 and -50 degrees F. When he does lighting in these freezers he uses conduit and XHHW single stranded conductors because of the low temperatures. He has some competition bidding on a project that they are using standard interlocking MC cable for this extremely low temperatures. He wanted to know if there were any NEC issues with this application. I looked and found nothing for low temperature (all I found was high temperature). I told him to check with manufacturers of the cable and see what (if any) are their low temperature ratings are and if it violated the manufacturers listing requirements you could use 2008 NEC 110.2 for the violation and make the other contractor use the method that is approved and be on the same page for pricing as being fair. My question is to any of you other instructors is: Is there anywhere in the NEC where there are low temperature limitations for conductors or insulation on conductors (other than cords)?
