Tapping off of service entrance (load side)


Old 12-23-14, 03:17 AM
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Tapping off of service entrance (load side)

Hello. My existing service entrance comes into my attached garage to a panel that contains only an OCPD/"master switch" (please excuse my terminology - I'm not an electrician but I think I have the right terms here). From there, service goes into the basement to what is the main panel.

I'm interested in putting a panel in the garage essentially right next to this service entrance panel/master switch. I am putting in a 240v heater and a table saw and will be running a small workshop from time to time in the garage. I want to run 100 amp service to a panel there in the garage and then provide a dedicated circuit for the heater (a King Electric unit) and then probably two outlet circuits (120v, 20 amp) for machines like the table saw.

My question is how do I go about tapping off of the panel that's in the garage rather then running all the way back to the garage from the current main panel. And, related, can I just tap off the existing garage panel (and leave the current wiring completely alone), or do I have to put this new panel "inline"?

I'm attaching a photo of the service disconnect panel that is in the garage. Any advice on how best to get a run off of what's here to a new panel I'll install like 2 feet away (say on the side of the same stud) would be most appreciated.

NOTE: there is definitely not any cable slack with what's already there, so if there is going to be any splicing required, please provide details on how I do that and with what devices.

Thanks in advance!

Photos: one is the top half of the existing service entrance panel/master switch and the other is the bottom half of the same panel. The service enters from the street into the bottom of the box and wraps around to connect to the OCPD on the top of it. Then it continues out the bottom of the OCPD and wraps around and goes out the top of the panel and on to the basement where it ties in to the main panel.

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Old 12-23-14, 08:01 AM
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You might be able to add the other panel off the meter if it accepts double lugs. You might be able to use the tap rules if the garage panel will have over current protection.
Old 12-23-14, 08:28 AM
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I think I'd just replace the 200 amp breaker disconnect panel with a 200 amp loadcenter with feed-thru lugs. This would provide you with all the breaker spaces you need and also allow the neutral to be properly grounded.

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