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generator transfer switch #203327 09/21/11 08:18 PM
Joined: Aug 2006
Posts: 356
Niko Offline OP
Member
I am planning on installing a manual transfer switch (200A) for a standby residential generator. The transfer switch will be immediately after the main 200Amp disconnect. My question is do i need to have a fused or non-fused transfer switch. Please provide NEC reference so i will learn and know for future.

Thanks for the replies


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Re: generator transfer switch [Re: Niko] #203329 09/22/11 09:58 AM
Joined: Jul 2007
Posts: 1,335
S
sparkyinak Offline
Member
It will have alot to do with which code revision you are under and local code. I'm out of the office and way from me code books as long as you wire the switch as a 200 and switch all the way through you generator panel then I don't see a need for additional OCPD's. It's protected.

A little side note with my inspector cap on, its my humble opinion even though it sounds like you are just doing an add on, it has to meet current code. I do belive in the 2008 cycle requires an automatic switch, not manual


"Live Awesome!" - Kevin Carosa
Re: generator transfer switch [Re: Niko] #203330 09/22/11 10:24 AM
Joined: Aug 2006
Posts: 356
Niko Offline OP
Member
We are under the 2008 NEC and it seems Manual switch is allowed. The main service is 200Amps but the portable generator is rated at 50Amps. I am installing 200Amp switch for future capability.


Be kind to your neighbor, he knows where you live

Re: generator transfer switch [Re: Niko] #203334 09/22/11 04:46 PM
Joined: Nov 2007
Posts: 763
K
KJay Offline
Member
If itís a 200A transfer switch on the load side of the 200A service disconnecting means, I donít see why it would need to be fused, especially if its service rated and sized for the full load.
I donít see anything the NEC that would require it either and I have never been required to install a fused transfer switch on a residence before. The generators Iíve installed all had their own built in OCP, which was rated lower than the maximum rating of the transfer switch.

Re: generator transfer switch [Re: Niko] #203335 09/22/11 04:48 PM
Joined: Apr 2002
Posts: 7,235
HotLine1 Offline
Member
Niko:

Ditto to what Kjay said above. OCP before xfr switch & full rated & service rated...no issues.



John
Re: generator transfer switch [Re: Niko] #203338 09/22/11 06:25 PM
Joined: Aug 2006
Posts: 356
Niko Offline OP
Member
I appreciate your replies.

Learning never exhausts the mind.


Be kind to your neighbor, he knows where you live


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