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Old 09-25-2012, 01:47 PM   #16
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Wiring a generator from the garage


As for the CO concerns, I appreciate everyone's input. I actually have measured the CO and it's not a problem. It's a very weird setup, but with all doors open (there are 4 on three walls) and windows as well as a vent up top, it is essentially the same as being outside under a covering.

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Old 09-25-2012, 01:57 PM   #17
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Wiring a generator from the garage


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That is, use a male receptacle in an outlet box as the "plug", which is rigidly fastened to the garage wall instead of at the end of a loose cord.

Use an ordinary extension cord, probably not more than 15 feet, to get from the inlet box to the generator.

If the underground cable did not stick out enough to reach where it needed to reach, additional Romex can be spliced on with a junction box required at the splice point. Indoor rated Romex can be used for a run wholly in a stud bay or other fully dry indoor location.

The generator must have breaker protection limiting the output to 20 amps at 240 volts (or 20 amps at 120 volts) if either of the following conditions are true:

1. The wires to the house are 12 gauge. (Fourteen gauge wire has a 15 amp limit.)
2. The box with receptacles for generator power in the house does not have individual breakers of no more than 20 amps for each receptacle or group of receptacles (if the box is not a subpanel with breakers).
Yes, this all makes sense. Essentially once I am done i will have a circuit that consists of a male "outlet" hard mounted in the garage connected by grey 12/2 grounded wire to an outlet in the basement and nothing else. Should the power go out I will connect the genny to the male "outlet" and then have one powered dual outlet inside the house for power needs. This will not be connected into the house circuit in any way. The genny is a 14.2A max and has a built in breaker so that shouldn't be a problem either.
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Old 09-25-2012, 02:38 PM   #18
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Wiring a generator from the garage


I would try to separate this generator feed from the other line to the garage. Preferably by pulling one of them out of the existing basement box and into a separate box, before mounting the outlet. I would also mark the duplex receptacle as a generator feed. You don't want someone tying it to house power by accident.
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Old 09-25-2012, 02:54 PM   #19
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Wiring a generator from the garage


Hmm..If it was me and I was going to use a portable generator..I would install a simple transfer switch box with 6 to 12 breakers / transfer switches. It would have an outlet to accept the frmale end of a 10/3 cord and allow me the use of 6 to 12 circuits, depending on the size of my generator and amount of transfer switches. This is compliant with my local codes, and would satisfy the utility companies requirement for an interlock. That seems to me a simpler, safer approach which anyone would understand. And I am not foolish enough to run a generator in a building of any sort....carbon monoxide is just one of the issues.
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Old 09-25-2012, 02:56 PM   #20
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Wiring a generator from the garage


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I would try to separate this generator feed from the other line to the garage. Preferably by pulling one of them out of the existing basement box and into a separate box, before mounting the outlet. I would also mark the duplex receptacle as a generator feed. You don't want someone tying it to house power by accident.
Yes, should have made that more clear. The garage receptacle will be clearly marked but obviously dead unless the gennie is running and connected. The line comes into the house through the conduit in the basement wall and whereas it formerly went into the box mounted there it would now go straight to the receptacle box i am designating for it. That will have a red outlet cover with the words "Generator Only" printed on it. Actually in order to get across the basement I'll need to mount a box to connect the line to more romex, but this will be closed and I will also mark it as genny power so there is no confusion. Again, during normal times, this entire line will be dead and not connected to anything at all. So even if one were to connect to it nothing would happen.
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Old 09-25-2012, 03:42 PM   #21
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Wiring a generator from the garage


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Last edited by AllanJ; 09-25-2012 at 03:51 PM.
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