fairchid45
Member
can panel feeder conductors be mix as in copper and aluminum if proper sizing is used for the load or can the ground wire be aluminum if the feeder wires are copper
conductors
- Thread starter fairchid45
- Start date
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charlie
Senior Member
- Location
- Indianapolis
Yes, the NEC has no prohibition on mixing conductor types except for 310.4 where the conductors are installed in parallel. :smile:
William1978
Senior Member
- Location
- N.C.
You could pull phase A in copper and phase B in aluminum in a parallel why any one would want to do it that way I don't know, but I've seen it done once.
dana1028
Senior Member
- Location
- San Francisco Bay area
Parallel - mixed conductors
Parallel - mixed conductors
I once saw an old 3-phase, 600A service with phase C being (2) RHW, 350kcm; phase B was (2) TW, nickel-clad 350 kcm; and phase A was one of each.
Nice mix and match arrangement; I have some nice close up photos of the arrangement but never have bothered to learn how to post them here.
Parallel - mixed conductors
I once saw an old 3-phase, 600A service with phase C being (2) RHW, 350kcm; phase B was (2) TW, nickel-clad 350 kcm; and phase A was one of each.
Nice mix and match arrangement; I have some nice close up photos of the arrangement but never have bothered to learn how to post them here.
chris kennedy
Senior Member
- Location
- Miami Fla.
- Occupation
- 60 yr old tool twisting electrician
charlie
Senior Member
- Location
- Indianapolis
That is a violation of 310.4(B). :roll:dana1028 said:
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
That's an issue. Paralleled conductors are supposed to have the same characteristics, including insulation type.dana1028 said:
76nemo
Senior Member
- Location
- Ogdensburg, NY
It's hard to believe this is allowed, especially comparing one phase to the next. I have never seen a mismatch like that.
Can you please fill me in some more?????????
I am totally dumbfounded!
Can you please fill me in some more?????????
I am totally dumbfounded!
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Each phase's paralleled conductors must be identical to assure equal current distribution. One phase's characteristics need not match that of another phase, though.76nemo said:
charlie
Senior Member
- Location
- Indianapolis
310.4(C) Separate Cables or Raceways. Where run in separate cables or raceways, the cables or raceways with conductors shall have the same number of conductors and shall have the same electrical characteristics. Conductors of one phase, polarity, neutral, grounded circuit conductor, or equipment grounding conductor shall not be required to have the same physical characteristics as those of another phase, polarity, neutral, grounded circuit conductor, or equipment grounding conductor to achieve balance. :smile:76nemo said:
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