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disconnect box when adding subpanel
On May 16, 1:28 pm, "RBM" rbm2(remove wrote:
As the others have indicated, you need to rethink this. 125 amp sub panel in the same building as the main panel doesn't require a disconnect in it or at it. If you need a 125 amp feeder, I believe it's 1/0 copper, which you can't pull three plus ground through a 1 inch conduit "tr" wrote in message oups.com... I am adding a 125 amp subpanel to the far side of my house. I need to add a disconnect breaker near the new subpanel...but...I can not find anything rated at 125 amps at either Home Deport or Lowes. The largest they have for disconnect is 70 amps for a spa setup.? Do I need to find a electrical supply house for this...or is there something I am missing at Home Depot ? Also...I am running a feeder line from the main panel to this subpanel...the run is about 100 ft...can someone tell me what the code is regarding the size of wire needed for this run. The retired electrician at Home Depot says a 4awg three connector cable will be fine...it is being run through 1" EMT across a flat roof with rain tight compression connectors ? Thanks, Tim Tim- 4 Gage is fine IF you're running in air......... in conduit you need to bump up to at least 2 gage & you're allowed three of them in a 1" conduit but you need a ground as well.....you "might" be able to sneak a smaller ground conductor in there (if allowable) but you'll have to do the fill calc Double check your ampacity (in a conduit) & make sure you spec the correct wire .......to get the highest ampacity you'll need THHN rated conductor do you really need 125 amps? 95 amps could be done with 4 gage THHN in a 1" conduit but than would be a tough pull. if the 1" conduit is already in, sounds like you're going to be conduit limited on your ampacity For a sub panel like you're talking about......I'd use 1.25 or 1.5" conduit to make my life easier double check my info before cutting any cable cheers Bob |
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