GeddyT
New member
- Location
- Bellingham, WA, USA
I'm preparing to wire my detached garage, all surface mount wiring in EMT from a surface mount breaker panel. A friend of mine is a 20+ year journeyman electrician, and he offered to help me out. His suggestion to clean up the install was to mount a NEMA pull box close to the ceiling above the breaker panel and then branch off all of the individual circuits in 3/4" EMT from this pull box, along the ceiling to keep it out of the way. He suggested a pair of 1-1/2" conduit runs from the breaker panel to the pull box would be more than sufficient for all of my wiring needs, and every conduit fill calculator seems to agree.
What I don't understand is how this doesn't run afoul of conductor derating rules. Each of these 1-1/2" conduits (about 6' long) will have about 20 #12 and 9 #6 in it, so wouldn't these wires be derated to oblivion by the time they got to the pull box?
I've been reading up here (waaay too much...), and it sounds like exception 310.15 (A) (2) has me covered. Am I right?
I don't doubt my electrician's expertise, but I'm a "trust but verify" kind of guy, particularly after how every single other job I've subbed out has gone. Thanks in advance for any advice you all can give me.
What I don't understand is how this doesn't run afoul of conductor derating rules. Each of these 1-1/2" conduits (about 6' long) will have about 20 #12 and 9 #6 in it, so wouldn't these wires be derated to oblivion by the time they got to the pull box?
I've been reading up here (waaay too much...), and it sounds like exception 310.15 (A) (2) has me covered. Am I right?
I don't doubt my electrician's expertise, but I'm a "trust but verify" kind of guy, particularly after how every single other job I've subbed out has gone. Thanks in advance for any advice you all can give me.