Installing a sub panel?

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Old 03-01-18, 07:45 PM
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Installing a sub panel?

I want to run a second breaker box in my house. I don't want to run 5/6 wires 60' so a second box seems like the easiest way to go. I will be running 5/6 circuits plus a circuit running to my garage. I have a spare 100 Amp box and breakers so that will not cost me anything. Question is, what size wire do I run from box to box? And what size underground cable to the garage (about 15') Garage will only have a few outlets, few lights and garage door openers. Maybe a small 120 air compressor. Is there something that has to be wired different on a sub panel, something about the neutral and ground can't go on the same bar? Thanks
 
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Old 03-01-18, 11:35 PM
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The panel feeder size will be determined by a demand load calculation m based off of the loads served.
 
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Old 03-02-18, 07:02 AM
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Neutral is isolated in any panel after the first main disconnect which is the main service panel. Most panels when used as subpanels require the purchase of a ground bar kit and the existing bar in the panel will be used only for the neutrals and the bonding screw/strap from that bar to the panel needs to be removed.
 
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Old 03-02-18, 10:03 AM
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There are some good diagrams on the site - https://www.doityourself.com/forum/e...-diagrams.html
 
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Old 03-03-18, 07:53 AM
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Thanks

Thank you for the replies. Those diagrams are very helpful.
 
 

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