J joe k. Member Oct 31, 2005 #1 Does the NEC address the insulation level required for cable? Per NEMA the level is based on time required to address ground condition. 100% under 1 minute 133% for time from 1 minute to 1 hour 173% for time greater than 1 hour.
Does the NEC address the insulation level required for cable? Per NEMA the level is based on time required to address ground condition. 100% under 1 minute 133% for time from 1 minute to 1 hour 173% for time greater than 1 hour.
B bphgravity Senior Member Location Florida Oct 31, 2005 #2 Re: 480 V un ground delta system No, the NEC is an installation standard not a product standard.
