Electrical Wiring in the Home/Generator Cable


I have a 5,000, 20A, Generac Portable Generator. The Generac User Manual indicates that I need plug 14-30P.
I have a 30A inlet at the outside of the house,which accommodates recepticle 14-30R.
Plug 14-30P is for a 30A generator. It does not fit into my 20A 5,000W Generac outlet.
I suspect the Generac manual is incorrect.
What is the correct spec for the Generac plug.
In summary, I'm looking for a cable with a 20A plug at one end and a 30A receptical at the other end.
Where can I find a ready made cable with that setup.
(I have a 30A Power Transfer Unit installed)
Thanks for volunteering.


The 14-30P is typically used for clothes dryers and I know some bigger generators use that configuration among others and thats how you ended up with that inlet config on your house.

You have an L14-20R twist locking receptacle on your generator. Verify that by looking closely at the receptacle. It should say it and display 125/250 volts

There is no one I know of who has this type of cable premade. Thats not to say it doesn't exist however. But you can easily make up your own using one L14-20P and one 14-30R (for cord)
and what ever length of 12-4 SJ cord you might need. Terminations are easy, green screw to green wire, silver screw to white wire, brass screws for the red and black. It does not matter which wire goes to which brass screw.

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Licensed Master Electrician (32 years) 6165B Contractor in Closter New Jersey with 40 years total experience in Residential - Commercial - Industrial work. Emergency Service - General trouble shooting and repair work - ONAN & GENERAC generator installation - Paddle fans - Kitchen & Bath exhaust fans - AC lines - Smoke detectors - Telephone lines - Cable TV lines - Computer network cabling - Exterior lighting - Recessed lighting - Security lighting - (200 - 150 - 100 amp service up grades) - Electric Heat - New circuits - New appliance hook ups - and more ! FREE ESTIMATES 201-358-1552 Fully Insured


Licensed contractor in Closter New Jersey.

"The Frank Williams School of Electrical Construction". My dear old boss is 100 ! and still going God Bless him. I started working for "Tenafly Electric" right out of high school at 19. He was tough but I learned more working for him in 8 and half years than most guys. We did mostly industrial work while doing some commercial and residential so I was fortunate to be exposed to all 3 areas of electrical construction. The guys I worked with were all good guys and I stay in touch with some of them still. Most of us went into our own buisness's which says something about the caliber of the guys I worked with. We had some interesting clients : Wella Corp. of shampoo fame, Farah Fawcett etc, I didn't buy shampoo for 10 years. It was a great place to work. Pan Am the former airline just before they went under, another great place to work, nice clean environment. C&C Metals, the largest button manufacturer in the US at that time, a not so clean environment but a very interesting place to work, lots of machine's cranking out buttons of all kinds but you had to be on your toes, it was a potentially dangerous place to be . All kinds of action going on around you.

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