T trip Member Mar 22, 2005 #1 Is it allowed to parallel conductors (500kcml) in a single mast thru roof, would 392.8(D), Or something similar require two masts.
Is it allowed to parallel conductors (500kcml) in a single mast thru roof, would 392.8(D), Or something similar require two masts.
tom baker First Chief Moderator & NEC Expert Staff member Location Bremerton, Washington Occupation Master Electrician Mar 22, 2005 #2 Re: Parrallel Conductors Yes you can use one mast, but you have 6 conductors not 3 and have to derate for fill.
Re: Parrallel Conductors Yes you can use one mast, but you have 6 conductors not 3 and have to derate for fill.
H highkvoltage Senior Member Mar 22, 2005 #3 Re: Parrallel Conductors If it's 3 phase 4 Wire you would have to use 5" conduit, 3 phase Delta you would have to use 4" conduit .I would install two conduits. You would also have to derate the conductors using table 310.15(2)(a). [ March 22, 2005, 11:07 PM: Message edited by: highkvoltage ]
Re: Parrallel Conductors If it's 3 phase 4 Wire you would have to use 5" conduit, 3 phase Delta you would have to use 4" conduit .I would install two conduits. You would also have to derate the conductors using table 310.15(2)(a). [ March 22, 2005, 11:07 PM: Message edited by: highkvoltage ]