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-   -   Is this correct and in compliance with NEC? (http://www.diychatroom.com/f18/correct-compliance-nec-57369/)

siearly 11-17-2009 05:52 AM

Is this correct and in compliance with NEC?
 
Hi all,

I'm new and looking for advice on something I want to do. Sorry for the long post but I'll try to explain it clearly.

I have now:
  • Main panel, 200A service on meter
  • Sub panel, 100A service
  • Generator panel for feeding some circuits
  • Separate off peak meter presently not used

The off peak meter goes to a single 220V 30amp breaker in its own box. It used to feed the water heater but was disconnected when the generator panel was installed. Now, the water heater is fed by the generator panel which is fed by the 100A feed from the main panel to the sub panel. The generator panel has an 'either or' (I don't know the correct term) main switch to feed it from either the generator or the 100A feed from the main panel.

I want to hook my dryer and water heater up to the off-peak meter.

I was planning to accomplish this by doing the following:
  • Change the breaker in the off-peak meter box from the existing 220V 30A to a 220V 70A (the box is rated for up to 70A)
  • Install a sub-panel that is fed from the off-peak meter box with #8 wire, the distance will be under 2 feet
  • Install 2 220V 30A breakers in the new sub-panel, one to feed the dryer and one to feed the water heater
  • Install an 'either or' switch at the water heater that allows me to feed the water heater from either my new sub-panel or my generator panel. The switch would have to be a break before make switch.

So, my questions are:
  • Is this to code?
  • What's the 'either or' switch I described called?
  • Do you have any suggestions for my installation?

Thanks in advance,

========
Steve

joed 11-17-2009 07:57 AM

You may not be able to simply change the breaker to 70 amp. It depends on the size of the wires feeding the panel.

siearly 11-17-2009 08:11 AM

Quote:

Originally Posted by joed (Post 354195)
You may not be able to simply change the breaker to 70 amp. It depends on the size of the wires feeding the panel.

Good point. The feed from the off-peak meter to the panel is 10 feet long and has the following markings:

XHHW CDRS 3000 VOLTS TO GROUND 2 CDRS 2 AL 1 CDR 4 AL

Physically, it contains two jacketed hot wires and one unjacketed twisted strand ground. All are aluminum.

Will this wire support a 70 main? If not what maximum load will it support?

Thanks,

========
Steve

Scuba_Dave 11-17-2009 09:15 AM

You say the off-meter is currently not in use ? Turned off ?
Usually these are for very specific uses
Pretty sure the water heater qualifies, I'm not sure on the dryer
Have you contected the POCO to run the change by them ?

siearly 11-17-2009 10:13 AM

Quote:

Originally Posted by Scuba_Dave (Post 354227)
You say the off-meter is currently not in use ? Turned off ?
Usually these are for very specific uses
Pretty sure the water heater qualifies, I'm not sure on the dryer
Have you contected the POCO to run the change by them ?

Not in use but not turned off. I've verified with the POCO and put a meter to it. They say I can connect anything I want to to it, as long as I'm okay with those devices being 'blacked out' during peak periods. For the HWH and dryer, I'm fine with that.


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