Garage Sub-panel Wiring Confusion - Please Help?
5 years ago
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- 5 years ago
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Sizing wire to sub=panel in detached building
Comments (13)I talked to more electricians than I can shake a stick at about this issue, because I basically needed to do the same type of thing. We added an addition onto our house, and the main panel is a good 60 feet from the new subpanel. I wasn't sure what wire to use, but I gathered from numerous electricians that if I wanted 100 amp service drawn into that subpanel (I have 200 amps at the main), then just get the aluminum AWG2 wire, run a ground along with it, stick it in some pvc conduit, conduit it straight into the sub panel, and you're good to go. I used 1 1/2" conduit (I know, overkill, but it sure was nice to not have to actually pull the cable -- it just slithered right through). So anyway, I hope all those electricians weren't jerking my chain....See Moresub-panel grounding rod in same structure as service panel?
Comments (3)He is 100% INCORRECT. NO grounding electrode and NO water bond! A 4-wire feeder is all that is required or wanted. A 3-wire feeder in a complete metallic conduit system works as well, but the fittings must be made up tight and the bonding on both ends must be correct....See MoreService Wiring to Sub Panel
Comments (7)Just bought 3/3 cable, so will go with 4 wire option. I do want to run a 2 way light switch into the house to run o/s lights @ garage when expected or unexpected guests arrive. My big problem is I don't have good access to house panel as the existing conduit is full. I'll get creative & find a way to the neutral, but for the ground- I'll connect to factory ground lug @ steel frame. It is a drop of 4' from house box. I'll bring the Hilti hammer drill home to drive the ground rods at the garage. Thanks for help-all of you. I'll try to return help at plumbing & gas fitting board....See MoreWiring a sub-panel for Aux. generator
Comments (6)I was looking at wiring diagrams for prewired transfer switches and they do exactly what I want to do. Take the hot wire off the breaker and connect it to the transfer switch which contains a breaker but they leave the neutrals and grounds where they were. So are they also wrong? I am not aware of the derating current when using a conduit but I suppose it has to do with "back emf" or eddy currents. I will have less than 15 feet of conduit and thought it easier & neater than running 12 NM cables. However I can just run 12 black(hot), 12 white(neutral) & 12 green (ground) in my 1 1/4 conduit. Or are you suggesting 3 separate conduits for each type of run?...See More- 5 years agolast modified: 5 years ago
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