200A panel on a 100A meter main

Status
Not open for further replies.
M

michael mckague

Member
Location
connectitcut
Everything about this service(residential) is 100A, including the main breaker, the seu and ser wires ect.. But it feeds 200A main lug panel. Is this an acceptable installation per the NEC.? I am thinking it is at least safe since the main breaker is still the weakest link. Nothing else is out of the ordinary about this dwelling and it was sized for 100A back in the 70's when the house was constructed.
 
michael mckague said:
Everything about this service(residential) is 100A, including the main breaker, the seu and ser wires ect.. But it feeds 200A main lug panel. Is this an acceptable installation per the NEC.? I am thinking it is at least safe since the main breaker is still the weakest link. Nothing else is out of the ordinary about this dwelling and it was sized for 100A back in the 70's when the house was constructed.
Click to expand...

You could feed 2000 amp gear if you wanted, if the load calc was over 100 amps you would have the main trip a lot.

This sometimes happens because the 100 -125 amp main lug panels are not made in large enough frame sizes to accomodate the number of branch circuits needed or desired.
 
I have been replacing a bunch of old 125 amp federal pacific panels in an apartment complex. The main breakers are in the meter rooms of these 6 plexes.I am using a 200 amp siemans 20/40 panel and they are way less expensive than the 125 equivalent 20 space with a main breaker. The 200 amp breaker only acts as a disconnect not an overcurrent device which is back in the meter room.
 
Status
Not open for further replies.
Top