Electrical Wiring in the Home/generator power to house

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Question
My old generator had a 20 amp outlet and the electrician who wired my house wired the cord for 20 amp.

My question is, my new generator only has a 30 amp outlet. Can I make or buy a cord that plugs into the 30 amp outlet on the generator and into the 20 amp (male) connector on the house?

Or do I need an electrician to completely re-wire the connection to my house for 30 amp?

Thanks!

Answer
Mark,

Sorry for the slow response but very busy with storm damage and generators here in Jersey.

The best thing to do is upgrade the line going into the house to match the 30 amp output of the generator. I don't know how your electrician wired the 20 amp line going into the house there fore I can't say if it would be OK to do a simple 30 amp to 20 amp plug conversion. The problem being the 30 amp line can put more current on the 20 amp line than it can handle unless the 20 amp line is protected by a 20 amp fuse or circuit breaker before it enters the panel. This is the correct way to do it in that scenario but it also limits the maximum amount of current your generator is capable of delivering to your house panel. Depending upon the size of your generator and your power needs it may or may not be a factor for you. In other words a 5500 watt generator puts out a little over 20 amps but its enough that the generator has a 30 amp plug on it. Do you need to upgrade the line for an exra 2 amps ? or you could have a 7000 watt generator that puts out 29 amps. Is it worth it to upgrade the line for the extra 9 amps ? Again it depends upon your load needs. Obviously more is better. So if you need it or just want the extra capability then upgrade the line.

Bob  
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PASCACK VALLEY ELECTRIC Bob Mossman

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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

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Licensed contractor in Closter New Jersey.

Education/Credentials
"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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