@dclauria - our contractor has recommended an interlock kit like you mentioned too. Says he's done many, both 30 and 50 amp.What brand of electrical panel do you have? I'm an electrical contractor and have installed many 30amp and 50amp generator inlet boxes with an appropriate "interlock kit" for a portable generator.
Sqd Homeline and Qo for newer panels can be found easily and cheaply online.
Older sqd panels and other brands can be found at interlockkit.com
Use #10 copper for a 30amp inlet box and #6 copper for a 50 amp.
You have to feed at the main panel if you want to be able to provide generator power to all your various circuits. An interlock kit on the sub panel is legit as far as code and would have some applications , however it would only power the circuits on the subpanel.@dclauria - our contractor has recommended an interlock kit like you mentioned too. Says he's done many, both 30 and 50 amp.
Certainly appears to be appropriate for our circumstances.
I have a 200A Square D Homeline panel, and a Sq. D Homeline subpanel in the garage.
Can that subpanel be used to feed the generator breaker with a dedicated generator 50A circuit and breaker in the subpanel, with a twist-lock plug?
Or does it need to be a separate feed to the generator breaker directly to the main panel?
I have #6 copper feeding the subpanel from the main on a 40A breaker. The twist-lock plug would be #6 THHN to the subpanel, if feasible.
If I'm reading it right, if you use the sub panel to backfeed the main, then the interlock on the main will make the sub panel useless unless the main is off.Guys - - appreciate all the advice.
Think I'm heading in a direction - right or not TBD.....
I (think) I'm going with an interlock on the main panel as @dclauria and @P0234 recommended.
Genny can't feed the panel lest the Main Breaker is off and Genny Feed Breaker is turned on. Appears legal far as I can tell.
Possibly looking to feed the Main via a subpanel in my garage. It's connected to the Main panel via 6/3 Romex.
No main breaker on the subpanel, as it's an attached garage connected to the house system, ground, etc.
Subpanel was put in for my welder, a future 240v air compressor, and some 120v outlets. (Also thought of generator backfeeding without protection).
Put a 50A Genny breaker in the subpanel, and another 50A in the Main panel, interlocked with the 200A Main Breaker....
Subpanel is right at my garage overhead door - -where I always run my current generator - - which I run120v extension cords to.
I can put a simple 14-50 plug off the subpanel via #6 THHN right next to my welder plug......
I will resurrect my older Thread about Generators - I think (??) a Floating Neutral Generator makes sense in this application?
If a Genny were Bonded Neutral, 2 bonding locations could actually be a hazard?
That I believe is how they work when ever you use one. I have one in my main panel I put in before the auto transfer and back up generator.If I'm reading it right, if you use the sub panel to backfeed the main, then the interlock on the main will make the sub panel useless unless the main is off.
Duh….my idiot was obviously showing…If I'm reading it right, if you use the sub panel to backfeed the main, then the interlock on the main will make the sub panel useless unless the main is off.
I have a lot of those days myself, glad to be able to help along with P0234. His post made me see the misunderstanding.
It happens to all of us. Just run a wire from your main panel to where you want your generator and use an interlock. Or if your utility supports it, a more expensive option but one that works really well is a Generlink. That's the option I would have gone with if my utility supported it, its the most flexible, probably the safest, easiest install and it doesn't eat up two slots in your panel. Bonus if you have multiple panels on one meter, it supports that too.