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Real good tjc.. 8-AWG would be sufficient..  i use an 8 where I inly need a 10-AWG.. Even in the panel.  My cord length from Genny to breaker is 6'... That keeps Gennys exh. off the side of the house.

dad was fire inspector for town for 25 years, fire marshal for 15 years.. and fire chief for 4 years. besides being a cop, and mail man.

i was fireman and cop for 8 years before my accident. 

i always go one gauge larger than needed. all my 15 amp circuits in the house are 12 gauge wire (25 amp rating) plus only 5 outlets per circuit where town says 8 per circuit. 
25 amp circuits are 10 gauge. 

when the town electrical inspector came for write off on my rebuild of the house back in 95, he could not understand why i did what i did and was going to fail me... until dad walked in the house. then it clicked as to last name, and he said oh ok. 

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when you are up to your armpits in alligators,

it is hard to remember you only came in to drain the swamp..

I can tell many people here are just using rule of thumb type of electrical design 

But it doesn't always work that way, while most times it does 

To make sure that a circuit breaker will trip as designed and do it's job of protecting the wire a few things have to be taken into consideration 

A few more than are mentioned here

I guess been a electrician for nearly four decades gives me a different view than most

Stay safe out there everyone, don't let the smoke out and remember there's a lot more to propper circuit design than just going up a gauge in wire and chucking a breaker on 

Generators are only as safe as the installation 

Some of the answers here aren't exactly safe and people can get hurt in a split second and it is for easy to change your life direction and the lifes of those near and dear to us

I could write on and on, but this is one of those things were a little bit of knowledge is very dangerous 

 

Paul

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Well Paul, i appreciate your knowledge. I would like to think that my electrician did a proper job installing my plug in and breakers.  However, i cant judge the work due to my limited knowledge. I lose power about 6 times a year, for over 12 years now, and i havent had any problems. I did ground my new generator to earth with a rod. That is the only other addition i made.  Thanks again Paul..  

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Paul, my reasoning for oversizing the wire is it will never get hot. 

yes i use 25 amp wire, but it is connected to a 15 amp breaker in the panel, and 15 amp outlets in the wall. 

i saw WAY TOO MANY fires caused by overloaded circuits causing the wire to overheat setting the studs afire INSIDE the walls. 

another big no no is ungrounded wire, or aluminum wire. 

when i bought this place, it had a mix of knob and tube, ungrounded cotton jacket, and aluminum wire. with screw in fuses in three different panels. i ripped everything out and replaced it all with one 150 amp service panel. on a 200 amp input line.  but the main is only a 150 amp breaker.

50 amps to the garage, and 100 amps for the house.

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when you are up to your armpits in alligators,

it is hard to remember you only came in to drain the swamp..

There is a lot more to propper electrical design than most people think

As I said, the rule of thumb works most times but some times it doesn't and them as we can see by photos shared on this thread, the results can be deadly

Just everyone be careful, electricity is pretty unforgiving 

 

Paul

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Really an interlock is cheap. I spend that much on a white pizza with spinach and ricotta. The worst case when installing one is you have to move a breaker to a lower spot to make room for your generator breaker. Like an hour of work tops

Screenshot 2025-01-12 214328.png

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JH2.jpg

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