Sub tapping

[loganhorse]

I have the attached panel feeding a 1 pole 30 and 2 pole 100 amp. Is there any code saying i cant tap the bottom to feed a 200 amp house panel?
The main on this is 200 amps so basically i would have 100 amp, 30 amp. Then come out of the bottom lugs with appropriate sized wire and feed a 200 amp house panel.

Thanks

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[charlie b]

This thread was temporarily closed because I could not determine, from the user's profile, whether this was a DIY situation. I have since learned that it is not. I am reopening the thread, with apologies to the OP for the delay and inconvenience.

 

[loganhorse]

I've went and read ever section I could think it would be covered under and I can't find anything that prohibits it. I'm under the impression that it would still be considered a sub panel and would just be wired just as that with ground and neutral being separate and running a 4 wire feeder.



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[Craigv]

I've went and read ever section I could think it would be covered under and I can't find anything that prohibits it. I'm under the impression that it would still be considered a sub panel and would just be wired just as that with ground and neutral being separate and running a 4 wire feeder.



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Yes, you'll run feeder conductors. Just be careful with load calculations, as you've possibly got enough panels to seriously overload a 200a service. What's the 100 amp breaker feeding?

If this load center is physically separate like on a pedestal/post, you should treat the 200a house panel as a separate structure supplied by a feeder. Install a grounding electrode, but keep the grounded and grounding buses unbounded. Assuming the displayed loadcenter is the service disconnect, it's the only place to bond grounded and grounding.

 

[Adamjamma]

My biggest worry is the panel itself. If it is only a 100 or 125 bus then you could not run it with a 100 amp main breaker and then tap the bottom for a 200 amp panel elsewhere... you are limited by the breaker and the bus feeding it.

You could feed a 200 amp panel with it, but the main breaker feed to that panel would be no more than the outgoing breaker... from the first panels... I am probably explaining it wrong, but, I have a few panels as sub panels, two hundred amp lugs... but only fed by 100 or 90 amp main breakers... which makes them 100 or 90 amp panels technically... as far as my usage goes. That is fine for what I am doing, and in my mind is simply a safety factor for the panel itself... as money wise the lug panels were not that much different at the time between 100 and 200 amp

 

[Little Bill]

My biggest worry is the panel itself. If it is only a 100 or 125 bus then you could not run it with a 100 amp main breaker and then tap the bottom for a 200 amp panel elsewhere... you are limited by the breaker and the bus feeding it.

You could feed a 200 amp panel with it, but the main breaker feed to that panel would be no more than the outgoing breaker... from the first panels... I am probably explaining it wrong, but, I have a few panels as sub panels, two hundred amp lugs... but only fed by 100 or 90 amp main breakers... which makes them 100 or 90 amp panels technically... as far as my usage goes. That is fine for what I am doing, and in my mind is simply a safety factor for the panel itself... as money wise the lug panels were not that much different at the time between 100 and 200 amp

First, the OP said the panel/disconnect is a 200A panel. 2nd, you're not really tapping the bus/panel as it is a feed through panel. The lugs at the bottom are feed through lugs. You can feed any panel 200A or greater. What you can't do is feed a panel with a lower than 200A rating from those lugs.

 

[loganhorse]

This panel is set right under the meter base on a post. I did not set this to begin with so my design would have been totally different.

But they have a 100 amp panel in a garage that was just built which is actually fed from a 30 amp 1 pole that the previous guy didn't do like he was asked so I'll have to fix.

And then 100amp feeding a camper on the back size of the property which is what they are temporarily living in until the house gets built.

So once its built they have asked me to finish it so I am going to change the camper to 50 amp and feed the garage with 100 amp then lug out the bottom to feed the house. Personally I would have rather ran 400 amp and fed 200, 100, and 100 but this is what is there so I'm trying to make use of what's there.

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[kwired]

I have the attached panel feeding a 1 pole 30 and 2 pole 100 amp. Is there any code saying i cant tap the bottom to feed a 200 amp house panel?
The main on this is 200 amps so basically i would have 100 amp, 30 amp. Then come out of the bottom lugs with appropriate sized wire and feed a 200 amp house panel.

Thanks

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Kind of one of the main reasons they make such a panel. Anything you connect to the subfeed lugs is a 200 amp feeder, presuming you size conductor properly.

You mention it is on post with a meter - there are versions of this with meter, main, small loadcenter, and subfeed lugs all in one also. I would have likely used one in your situation.

First, the OP said the panel/disconnect is a 200A panel. 2nd, you're not really tapping the bus/panel as it is a feed through panel. The lugs at the bottom are feed through lugs. You can feed any panel 200A or greater. What you can't do is feed a panel with a lower than 200A rating from those lugs.

You can attach feeder taps to these lugs also, there will need to be an overcurrrent device at the other end of the tap. Outside feeder taps aren't limited in length.