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Why do 320a meter bases only have accommodations for 600kcmil al? I understand that it is continuous current but a 400 amp main would have a potential of 320 amps of continuous current but requires a conductor/conductors that total 400 amps.
 

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Why do 320a meter bases only have accommodations for 600kcmil al? I understand that it is continuous current but a 400 amp main would have a potential of 320 amps of continuous current but requires a conductor/conductors that total 400 amps.
What size would you like it to have?
 

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Why do 320a meter bases only have accommodations for 600kcmil al? I understand that it is continuous current but a 400 amp main would have a potential of 320 amps of continuous current but requires a conductor/conductors that total 400 amps.
Copper?
 

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Discussion Starter #4
Maybe this is the source of my confusion, why would the meter base manufacturer not make provisions for an aluminum conductor with an ampacity of 400 amps? I was looking at a Milbank 320 amp meter base and the lugs available only go up to 600 kcmil.
 

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Discussion Starter #6
Is a 320 amp meter base with 600 al riser conductors feeding a 400 amp main fed by paralleled 250 al or two 200 amp panels fed by 250 al conductors code compliant?
 

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Nobody runs a single conductor for 400 amps. When we use a 400 amp meter base ( 320 continuous) then we run 2 sets of 3/0 copper - one for each 200 amp panel. That is why they have 2 lugs. -- is your meter base different
 

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Nobody runs a single conductor for 400 amps. When we use a 400 amp meter base ( 320 continuous) then we run 2 sets of 3/0 copper - one for each 200 amp panel. That is why they have 2 lugs. -- is your meter base different
I wouldn't say nobody, I've seen it plenty. When I get 320's I have my choice of single lugs or double
 

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I wouldn't say nobody, I've seen it plenty. When I get 320's I have my choice of single lugs or double
Okay no body around here. Ours come with double lugs. So if this is a 400 amp meter base then the lugs should be bigger than what they are supplying?
 

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I also have never seen a 320 amp base used for commercial so why would anyone use it for resi work and use a 400 amp panel. That's expensive
 

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I also have never seen a 320 amp base used for commercial so why would anyone use it for resi work and use a 400 amp panel. That's expensive
Our meter enclosures are issued by the POCO. Milbank. S8 is the standard 200 amp socket for resi. Then we have the S52 320 amp for resi with option for single or double lugs and the S56 or 58 (i forget) which is just a 3 phase version of the S52.
 

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I also have never seen a 320 amp base used for commercial so why would anyone use it for resi work and use a 400 amp panel. That's expensive
The few times I've seen it, was for farm work, 400 amp load center , and a few times I've seen 400 amp transfer switch, with double lugs, feeding two panels as you mentioned.
 
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