Service Load

[ceb58]

Looking at plans for an addition to a church with an existing CT can feeding 2- 200 amp 240v single phase panels . The only thing the engineer has on the plans is the load calculation for a new 200 amp 240v single phase panel that is to be added. His load calc. is 41.6 Kw for this new panel alone ( will never see 100amps let alone 173 amps but what ever ). I called the POCO and got the max demand load on this church for the last year per 220.87 (1). It was a whopping 6.5 Kw. So with these numbers it works out at 200.08 amps demand. Any reason I cannot just up it to 320 amp service and call it a day. I have to replace the CT can any way due to having to relocate it and it did receive some damage from the hurricane last year.

 

[Cow]

Looking at plans for an addition to a church with an existing CT can feeding 2- 200 amp 240v single phase panels . The only thing the engineer has on the plans is the load calculation for a new 200 amp 240v single phase panel that is to be added. His load calc. is 41.6 Kw for this new panel alone ( will never see 100amps let alone 173 amps but what ever ). I called the POCO and got the max demand load on this church for the last year per 220.87 (1). It was a whopping 6.5 Kw. So with these numbers it works out at 200.08 amps demand. Any reason I cannot just up it to 320 amp service and call it a day. I have to replace the CT can any way due to having to relocate it and it did receive some damage from the hurricane last year.

If we were using a CT can, the smallest perch we'd get for it would be a 400 amp. Realistically, we buy 800 amp perches for everything because the price is similar and I like the lug layout better.

If I had (3) 200 amp panels fed from this CT can, I'd call it a 600 amp service for permit and inspection purposes.

I'm not sure where you come up with a 320 amp service? I've only heard that in regards to the ratings of meter bases, but not CT metering the way you're doing it.

 

[electrofelon]

If we were using a CT can, the smallest perch we'd get for it would be a 400 amp. Realistically, we buy 800 amp perches for everything because the price is similar and I like the lug layout better.

If I had (3) 200 amp panels fed from this CT can, I'd call it a 600 amp service for permit and inspection purposes.

I'm not sure where you come up with a 320 amp service? I've only heard that in regards to the ratings of meter bases, but not CT metering the way you're doing it.

I think he is saying to nix the CT and just use a class 320 socket. Sounds good to me.

 

[roger]

Hey Curtis, I would go with the 320 too. Seems the best in my mind.

Roger

 

[ceb58]

Hey Curtis, I would go with the 320 too. Seems the best in my mind.

Roger

Hey, Roger
Inspector has thrown a wrench in the situation. Because the engineer who did the drawings for the addition did not include the load calculation for the existing panels he will not go with the 1 year max. demand load from the POCO plus the calculation for the 1 new panel. So now the drawings have to go back to the engineer for calculations to size the service.

 

[electrofelon]

Hey, Roger
Inspector has thrown a wrench in the situation. Because the engineer who did the drawings for the addition did not include the load calculation for the existing panels he will not go with the 1 year max. demand load from the POCO plus the calculation for the 1 new panel. So now the drawings have to go back to the engineer for calculations to size the service.

Why not? That's what the code says you (can) do :?:

 

[ceb58]

Why not? That's what the code says you (can) do :?:

Because the engineer doesn't have them on the plans that will be submitted for approval.

 

[electrofelon]

Because the engineer doesn't have them on the plans that will be submitted for approval.

So the engineer can submit "220.87 load plus new load = 201 amps"?