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mike.shultz46 11-08-2013 02:09 PM

generator inlet box
4 Attachment(s)
My house had an existing genrator transfer switch and subpanel. The power inlet box wat a 4 prong/20 amp. I have a genereator that has a 3 prong/30 amp outlet. I bought a 3 prong/30 amp inlet box and a 3 prong/20 amp cable. I'm now researching and i'm not sure this is going to work. It looks like the 4 prong is for 240v and the 3 prong is for 120v. In the second picture you can see the black and red connecting. The black connects to the top left of the white wire. The 3rd picture shows the existing inlet box. the 4th picture is the new inlet box 30amp/ 3 prong..

dmxtothemax 11-09-2013 01:34 AM

Is the new genny 240v ? Or 120v ? What does the manual say ?

mike.shultz46 11-09-2013 07:34 AM

The manual says 120v 30amp

k_buz 11-09-2013 07:49 AM

The panel and inlet are wired for 120/240V. You generator is not. You will either need a different generator or rewire the panel and inlet. It should also be noted that you cannot run any multi wire branch circuits off of a 120V panel.

mike.shultz46 11-09-2013 08:02 AM

What is a multi wire branch circuit?

k_buz 11-09-2013 08:11 AM

2 hots that share a neutral.

mike.shultz46 11-09-2013 08:28 AM

my subpanel has 4 circuits currently connected. one powers my boiler cirulation pump,one runs my kitchen outlets,one is for basement circuit and one is for living room circuit. can i install the 3 prong inlet box and power my 4 circuits? none of the items being powered is 240v as far as i know, which is not much.

k_buz 11-09-2013 10:17 AM

You will be very limited. 30a @120V isn't much...especially when the fridge kicks on.

Just because you don't have any 240V appliances running from the genny, doesn't necessarily mean you won't have some rewiring to do. The current set up is for 120/240.

Is that an auto or manual transfer switch?

mike.shultz46 11-09-2013 12:56 PM

Manual xfer switc h

dmxtothemax 11-09-2013 11:16 PM

If you are quite sure that there are NO 240v loads,
Then it's possible, but you will need a proper transfer switch,
I'am not sure whaat code allows for your area thou !
Best to consult an electrician, as this is NOT straight forward,
And must be done right to ensure maximum safety.

mike.shultz46 11-10-2013 06:52 AM

What is wrong with the current transfer switch? I guess I really have 2 questions. How would i wire the 30A/120V generator into my current system. Would I be better off buying a new 30V/240A generator and would that work with my current setup, although i will still need a new 30 amp inlet box. The current cable running from the inlet box to the transfer switch is 10 gauge and about 25' long. Is that OK for 30Amps ?

Philly Master 11-10-2013 07:33 AM

ok .. i am CORNfused ....

is see from the pictures

1 4 prong 30 amp installed ...

1 manual transfer switch

1 sub panel used as a "generator Panel"

all within about 6 feet of each other ??

where does the 30' of # 10 come into play .... the cord from the GEN ?? to the outlet/inlet ??

Philly Master 11-10-2013 07:35 AM

ok looked again .. so the outlet is 30' away from the transfer switch correct

k_buz 11-10-2013 07:40 AM

There is no issue with the transfer switch, there may have been if it had been a automatic one.

dmxtothemax 11-10-2013 05:36 PM

Can the transfer switch be re configured to feed both legs from one 120v
source ?
Does code allow ?

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