400 amp service

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sportzcoach

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Denver
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Electrical Contractor
I have a meter stack with 8 320 amp 3 phase meters It has fuse blocks and says 320 amp max.
Engineer has 400 amp JJN fuses listed for feeders Is this legal to do?
 
electrofelon said:
Class 320 meters are rated 320 continuous, 400 non continuous so up to 400A should be fine - unless for some reason the manufacturer rates these lower🤔
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Yes, because your continuous load calculation should be no higher than 80% of 400 amp. Coincidentally that is 320 amp, hence the 320 amp continuous meter in a 400amp meterbase.
Unless your calculation puts you over 320 amp you will need to go to a full 400 amp service that utilizes CT metering.
 
mopowr steve said:
Yes, because your continuous load calculation should be no higher than 80% of 400 amp. Coincidentally that is 320 amp, hence the 320 amp continuous meter in a 400amp meterbase.
Unless your calculation puts you over 320 amp you will need to go to a full 400 amp service that utilizes CT metering.
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I "320 amp continuous" does not mean "320A max fuses"
 
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