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Joined: Apr 2002
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aldav53,
There is no distance limitation between the 200 amp breaker and your sub panel.
Curt
Curt Swartz
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Adlav53,
Caselec, said that the 4/0 aluminum is only for 200-amp services. The 400-amp service will need 350 MCM aluminum. This will cause you to run bigger PVC conduit from the transformer.
The POCO architect should of realized that. Are you sure that he understands clearly that you are planning on upgrading from 200-amp service to 400-amp service?
You can put the remote 200-amp panel on the other side of the house or lot for that matter. It does not matter, just more 2/0 / 3 romex for you to buy.
[img]http://www.dale-electric.com/images/4%2D0%20ser%2D4wre%2Dal%2Ejpg[/img]
Tev
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In the code book 4/0 is rated a lot less than 400 amps. Maybe the power co has different standards?
The Golden Rule - "The man with the gold makes the rule"
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I will need 3 or 4/0 just for the 200 amp panel. Will check with Po Co again on that.
The Golden Rule - "The man with the gold makes the rule"
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Checked with the Power Co on the 4/0 and they say it is good for a 400a service, they have their own standards. Not sure how the Power Co rates their wire?
I will need at least 3/0 (good for 214 amps) or 4/0 (253 amps) for the 200 amp sub panel.
Looks like a 2" emt run through the garage to the back of the house.
The Golden Rule - "The man with the gold makes the rule"
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In Phoenix at least 1/0 AL for 200A and 4/0 AL for 400A from the POCO is normal. We also can't use EUSERC in Phoenix for one reason or another. Seems APS and SRP like to do things differently here. Make sure you get a 400A service specifically for your utility company. They both use different style meter sockets on there 400A services. Wonder how Tucson is since they have a different POCO?
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Well the 400 amp panel passed inspec and is up and running. Although I did have to add another 8 circuit subpanel because there are only 30 spaces in the main 400 amp (40 in the original 200a). So I have a 400a with a 200a sub on the other side of the house, then a 100a right next to the 400a.
The Golden Rule - "The man with the gold makes the rule"
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Aldav,
Hey, good job!!
I have a question. Did SRP have to pull in bigger feeder wires? If so, did they use the same conduit?
Thanks,
Tev
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No, SRP did not have to pull in bigger feeders, they said 4/0 was big enough for 400 amps.
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US utilities typically apply demand/diversity factors for single services, where that is a little unusual in NEC-land. Part of their rationale is that they use a shorter list of standardized ‘cookie-cutter’ construction materials, and can replace something of theirs that’s broken at 3AM if they ”need” to.
Some ‘engineering justification’ by utilities for small service-lateral conductors is not NEC 310-16 cable-insulation thermal problems contactors allow for, but 1.) Calculations are made so the customer won’t have a voltage-drop problem, and 2.) Conductor size is assigned by us to limit fault current at customer equipment.
Over time, if you get to know their estimators, you can deal with them a little. An argument I got into with a large utility a couple of decades ago was over their insistance on me installing 2-bolt ½-inch compression lugs in a 400-amp CT section…for 1/0 AWG AL. Their attitude can be: “Do it our way or no electric service. Case Closed—End Of Discussion.”
[This message has been edited by Bjarney (edited 10-05-2003).]
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