New meter banks

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kmadson

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Location
chico ca
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electrician
Stumped and looking for an answer: There is an existing 400 amp utility service 120/240v single phase (PG&E) feeding a apartment building meter bank that holds 8 separate meters. Each meter has a 100 amp main breaker that feeds a sub panel for its own apartment unit. I aim to replace these meter stacks with new but my question is: Is a 400 amp service enough for 8 100 amp meters?? Seems as though 50 amps per apartment unit just isn't enough power.
Any advise on how to go about this??
 
Why are you changing it? Is it because of load issues or because of age/deterioration?
you get load data for each apartment?
You could run a calculation to see what each apartment needs.

You don’t divide 400 amps by 8 to get 50 amps per apartment. Diversity comes into play with apartments.
Adding up 8-100 amp breakers doesn’t mean 800 amp service. I’ve seen 200 amp panel boards loaded up with 400 amps worth of breakers.
 
kmadson said:
Stumped and looking for an answer: There is an existing 400 amp utility service 120/240v single phase (PG&E) feeding a apartment building meter bank that holds 8 separate meters. Each meter has a 100 amp main breaker that feeds a sub panel for its own apartment unit. I aim to replace these meter stacks with new but my question is: Is a 400 amp service enough for 8 100 amp meters?? Seems as though 50 amps per apartment unit just isn't enough power.
Any advise on how to go about this??
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you will need to do a load calculation per article 220 or determine the maximum load per 220.87.
 
Note that if you are on the 2020 code there are no meter stacks with disconnects on the market that comply with 230.71(B)
 
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