150amp residential sub panel

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AedinP

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Electrician
Hi all,
I'm putting in a subpanel at someone's shop and I have a quandry. Customer has a 400 amp service with two 200amp panels in his house. He purchased a 150amp panel to put in his shop to be fed from the second 200a panel which currently is only feeding a couple small loads. My question is how is the best way to feed that sub panel since I can't get a 150amp breaker in that small form size? Or do they make small 150amp breakers that I just can't seem to find? Is there a way to add feed-through lugs to the bottom of the bussing to have it feed from the 200a main breaker?
Appreciate any insight.
 
If the 200 amp panel has provisions for feed-through lugs (i.e., you don't have to drill new holes), then use conductors rated for 200 amps (or take advantage of a tap rule, if one applies) and provide a 150 amp main breaker in the 150 amp panel. That should do the job for you.

If you would have to drill holes, then someone other than me would have to address the legality of that installation.
 
augie47 said:
Is the shop detached from the house ?
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Yes, it's detached. About 40 ft away.
tom baker said:
How much power do you need at the shop? Can you get a 100 amp breaker?
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He has a small living quarters and he'll have provisions for some equipment: a welder plug, table saw, etc. Just hobby stuff. It might just make more sense to go down to a 100a sub to save headache.. I was just hoping there's a solution for what he already bought.
infinity said:
What is the make and model number of the panel?
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It's an Eaton resi panel (w/ concentric kos)... have to follow up on the model number. Biggest breaker I could find was 100a.
jaggedben said:
Tap the feeder to the lightly used panel.
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I was wondering if I could do that.. I'll check the main breaker and see if it's rated for extra wires.
charlie b said:
If the 200 amp panel has provisions for feed-through lugs (i.e., you don't have to drill new holes), then use conductors rated for 200 amps (or take advantage of a tap rule, if one applies) and provide a 150 amp main breaker in the 150 amp panel. That should do the job for you.

If you would have to drill holes, then someone other than me would have to address the legality of that installation.
Click to expand...
It has some holes along the bussing all the way down, I might be able to tap and use those. I'll look into it further when I get back there.
 
Plug on subfeed kit (looks like a double pole or 4 pole breaker without a handle). You would have to use the feeder tap rules though so that can limit the feeder pathway. Use 200A conductors and you may have more options.
 
Somewhat depends on the panel manufacturer.

I know Eaton makes 225 amp rated lug kit for the BR panels. Good luck finding them. It can be tricky.

One of the tap rules may work for you.

Remember, if the shop is detached, you’ll need a disco there.
 
You might look at the possibility o0f applying 230.40 Exception 3.
If the layout allows you can come straight from the meter to the detached shed without disturbing the existing panels.
A great number of the detached buildings are supplied that way here.
(Verify the loads and make sure POCO has no problem with this arrangement)
 
augie47 said:
You might look at the possibility o0f applying 230.40 Exception 3.
If the layout allows you can come straight from the meter to the detached shed without disturbing the existing panels.
A great number of the detached buildings are supplied that way here.
(Verify the loads and make sure POCO has no problem with this arrangement)
Click to expand...
I 💜 230.40 ex#3! 😻
 
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