Room for sub panel

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Alwayslearningelec

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NJ
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Someone wants to put subpanel in basement that would need to feed 4-20 amp circuits That would be lighting and receptacles and a another circuit for a electric dryer. And maybe another one or two spare 1 pole 20 amp circuit.
How do They determine if We have the capacity in main panel here to run to feed to the sub panel and what size feed or main breaker what I need in the subpanel? Ok photos too large to upload. MCB in main panel is 200A.right now there are 20- 1p-20a breakers active for receptacles and lighting and 2-2p 30a for condensor units and 2-2p 20 for air handlers.
 
horsegoer said:
Someone wants to put subpanel in basement that would need to feed 4-20 amp circuits That would be lighting and receptacles and a another circuit for a electric dryer. And maybe another one or two spare 1 pole 20 amp circuit.
How do They determine if We have the capacity in main panel here to run to feed to the sub panel and what size feed or main breaker what I need in the subpanel? Ok photos too large to upload. MCB in main panel is 200A.right now there are 20- 1p-20a breakers active for receptacles and lighting and 2-2p 30a for condensor units and 2-2p 20 for air handlers.
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Get the Mike Holt electrical tool box app and preform a load calculation. Saves a lot of time.

Without doing that we would still need to know if there is gas appliances or all electric. That can make a big difference. Also there are no big loads outdoors such as pools/spas or EV?
 
Agree, an Art 220 load calculation is the "correct" method but it's done every day based on a competent electricians knowledge and experience.
In your case there does not appear to be any significant loads to prevent the installation of a 60 amp subpanel.
 
If those circuits already exist and are fed from the main panel, then nothing changes --you're just rearranging the loads. If these are new circuits/loads, then you need to do a complete load calculation for the service to make sure it is large enough. Then, you do another load calculation for just the feeder using only the circuits or floor area being supplied by the subpanel. That will tell you the minimum size the feeder must be.
 
horsegoer said:
Someone wants to put subpanel in basement that would need to feed 4-20 amp circuits That would be lighting and receptacles and a another circuit for a electric dryer. And maybe another one or two spare 1 pole 20 amp circuit.
How do They determine if We have the capacity in main panel here to run to feed to the sub panel and what size feed or main breaker what I need in the subpanel? Ok photos too large to upload. MCB in main panel is 200A.right now there are 20- 1p-20a breakers active for receptacles and lighting and 2-2p 30a for condensor units and 2-2p 20 for air handlers.
Click to expand...
This sounds exactly like a "Do It Yourself" thread. What's up Horsegoer, has someone hijacked your network?
 
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