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Old 12-01-2009, 09:48 AM   #1
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What type wire to use from transfer switch to outdoor outlet


I have installed a Connecticut Electric transfer switch for my generator (7500 watt) to my breaker panel and now I want to run wire from the switch 60 feet inside the house and hook up to an outlet (30 amp) that will be attached to an exterier wall of the house. I have purchase a rain tight outlet box, the only thing I need to do is run the wire into the back of it from the basement.
The question is, I purchased 10/3 NM-B with ground wire, the wire has a white, black, red, and un-cased ground. Would this be the correct wire to use? I had the impression that I needed 10/4 wire, with the ground wire cased,(green) but the Home Depot person stated that since this is an interior installation, that the 10/3 is what I need. Is the 10/3 wire correct? The transfer swich has a red, black, white and green wire to hook to.

Thanks for any help.

Brian

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Old 12-01-2009, 12:53 PM   #2
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What type wire to use from transfer switch to outdoor outlet


Check with your local authority. It is always cheaper to only have to do a job once.


Last edited by MI-Roger; 12-02-2009 at 11:57 AM.
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Old 12-01-2009, 07:01 PM   #3
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What type wire to use from transfer switch to outdoor outlet


I would hope that you are considering installing an inlet for your transfer switch feed.
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Old 12-01-2009, 07:22 PM   #4
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What type wire to use from transfer switch to outdoor outlet


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Originally Posted by MI-Roger View Post
It sounds as if this run of wire will be the power feed into the home when no utility power is available and you are running off the generator. If so, the local code authority may consider this to be an alternate "Service Entrance" which will require all wires to be protected by conduit for a run of this length. You are prohibited from installing NM cable in conduit.

Check with your local authority. It is always cheaper to only have to do a job once.
This would not be classified as an alternate service entrance (a term I have never heard in my career) as the generator will have a main breaker on it, making the wiring feeding into the building a feeder cable not a service cable.

Secondly, service entrance cables are not required by the NEC to be protected by conduit for the entire run. It is not uncommon to do the entire service in SEU cable.

Thirdly, there is no prohibition in the NEC from running NM-B cable in conduit, with the exception of conduit outdoors. This has to do with the conduit installed outdoors being classified as a wet location and NM cable can not be installed in a wet location. Running NM-B in conduit indoors (dry location) is perfectly acceptable to the NEC, unnecessary unless it's for protection from physical damage, but code legal.

However, I too would suggest checking with the local inspector before starting the project if there are any questions.

Also, to echo what kbsparky said, make sure you use an inlet not an outlet. There is a big difference.
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Old 12-02-2009, 06:46 AM   #5
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What type wire to use from transfer switch to outdoor outlet


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This would not be classified as an alternate service entrance (a term I have never heard in my career) as the generator will have a main breaker on it, making the wiring feeding into the building a feeder cable not a service cable.

Secondly, service entrance cables are not required by the NEC to be protected by conduit for the entire run. It is not uncommon to do the entire service in SEU cable.

Thirdly, there is no prohibition in the NEC from running NM-B cable in conduit, with the exception of conduit outdoors. This has to do with the conduit installed outdoors being classified as a wet location and NM cable can not be installed in a wet location. Running NM-B in conduit indoors (dry location) is perfectly acceptable to the NEC, unnecessary unless it's for protection from physical damage, but code legal.

However, I too would suggest checking with the local inspector before starting the project if there are any questions.

Also, to echo what kbsparky said, make sure you use an inlet not an outlet. There is a big difference.


When you say inlet, I am going to assume that you mean the box on the house will have the male end, and the cord have a female end, right?
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Old 12-02-2009, 09:02 AM   #6
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What type wire to use from transfer switch to outdoor outlet


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When you say inlet, I am going to assume that you mean the box on the house will have the male end, and the cord have a female end, right?

Oh, never mind, the box that is being shipped is an inlet.

Thanks for the help, I feel much more comfortable.

Brian
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Old 12-02-2009, 10:42 AM   #7
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What type wire to use from transfer switch to outdoor outlet


However, I too would suggest checking with the local inspector before starting the project if there are any questions.
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Old 12-02-2009, 03:35 PM   #8
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What type wire to use from transfer switch to outdoor outlet


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When you say inlet, I am going to assume that you mean the box on the house will have the male end, and the cord have a female end, right?
exactly!
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Old 11-13-2013, 08:45 PM   #9
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What type wire to use from transfer switch to outdoor outlet


I read this post. My question is similar. I had to run a 68 ft length of 10/3 plus ground romex from the transfer switch to the inlet box in my garage. From there I have to use a 20 ft length of 30 amp, 10/3 cable to the generator. My generator is rated 7500Watts. Can I safely power my 10 circuits from my generator power switch, with this run and thickness of wire? I would only be powering 15 and 20 amp single pole circuits, like furnace, lights, frig, etc. I know about the 3 volts max voltage drop. I am confused when reading the voltage, watts, on line calculators. Thanks for any help.
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Old 11-13-2013, 10:10 PM   #10
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What type wire to use from transfer switch to outdoor outlet


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... I know about the 3 volts max voltage drop. ...
Not volts, percent. It's max 3% VD on the feeder and max 2% VD on the branch. Total 5% VD max, source to equipment.

3% is about 96 feet of 10/3 w/g cable (240V, 30A). 68+20=88' is still less than 96'. So it's fine. If you're done don't worry about it.

If you have doubts, upping the wire size on the romex only, would be a cost effective way to improve VD.
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Old 11-14-2013, 03:15 AM   #11
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What type wire to use from transfer switch to outdoor outlet


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Originally Posted by brjl View Post
I have installed a Connecticut Electric transfer switch for my generator (7500 watt) to my breaker panel and now I want to run wire from the switch 60 feet inside the house and hook up to an outlet (30 amp) that will be attached to an exterier wall of the house. I have purchase a rain tight outlet box, the only thing I need to do is run the wire into the back of it from the basement.
The question is, I purchased 10/3 NM-B with ground wire, the wire has a white, black, red, and un-cased ground. Would this be the correct wire to use? I had the impression that I needed 10/4 wire, with the ground wire cased,(green) but the Home Depot person stated that since this is an interior installation, that the 10/3 is what I need. Is the 10/3 wire correct? The transfer swich has a red, black, white and green wire to hook to.

Thanks for any help.

Brian
Yes your fine ... ( but with this ... i have heard .. never happened to me .. that there are some inspectors get a bug up thier butt and want the 6 inches of wire that goes outside to be water tight ...)
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Old 11-14-2013, 03:17 AM   #12
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What type wire to use from transfer switch to outdoor outlet


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Originally Posted by coldfrigman View Post
I read this post. My question is similar. I had to run a 68 ft length of 10/3 plus ground romex from the transfer switch to the inlet box in my garage. From there I have to use a 20 ft length of 30 amp, 10/3 cable to the generator. My generator is rated 7500Watts. Can I safely power my 10 circuits from my generator power switch, with this run and thickness of wire? I would only be powering 15 and 20 amp single pole circuits, like furnace, lights, frig, etc. I know about the 3 volts max voltage drop. I am confused when reading the voltage, watts, on line calculators. Thanks for any help.

I would never install an "inlet" inside a garage ..


besides that you should be fine ...
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Old 11-14-2013, 05:29 AM   #13
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What type wire to use from transfer switch to outdoor outlet


I installed the inlet box, in a recessed way "tunnel" between two bump outs boxed with sheet rock. That way it can not be bumped or hit. It is about 10 ft from my garage door. Now I can attach a 20 ft 30 amp cord to connect to the generator outside. I was told in our town, we can do our own wiring, but have to obtain a permit, and get an inspection. So it seems, all are on board with me already using my 10/3 wire, and not to worry about voltage drop? does anyone think the inspector won't go for it, if they go by NEC as I am told? I really don't want to go through the added expense of using 8/3 wire, if I don't have to. The house is natural gas heat and gas stove, sewer, no well pump. Like I said frig, lights , furnace, microwave. Does the inspector take into consideration, what I am trying to power up? Thanks for all the help.

Last edited by coldfrigman; 11-14-2013 at 05:33 AM.
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Old 11-14-2013, 05:50 AM   #14
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What type wire to use from transfer switch to outdoor outlet


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Originally Posted by coldfrigman View Post
From there I have to use a 20 ft length of 30 amp, 10/3 cable to the generator.
I hope you mean 10/4...3 conductors + ground.
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Old 11-14-2013, 07:31 PM   #15
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What type wire to use from transfer switch to outdoor outlet


I used Romex brand NM-B 10/3 plus copper ground wire. I have a red, black, white insulated leads, and 1 uninsulated ground wire.

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