Greetings everyone,
1st post for me here. I am installing a arc welder which calls for in it's litature using art. NEC 630-11 a OCPD @ 150 amps and conductor @ #4 (95 amps @ 90c table 310.16). The welder is single phase with a # 6 cord and a 50 amp plug. I ran the #4, but put in only a 50 amp OCPD backing up the 50 amp cord non fused disc. Duty cycle is 60%
My questions;
Why do they use 90 c column, most OCPD's and devices are 75c?
Should I have replaced the factory cord with 100 amp and direct wire with a disconnect or sell the cust a 100 amp cord, plug and recept.? OR just slap in a 150 amp backing the 50 amp recept! What if a different piece of equip is plugged in that location.
Many thanks guys!
