Sizing the Inlet, Breaker, and Cord to Your Generator
Last verified: September 2026
How the outdoor inlet, the generator breaker, and the heavy cord are all matched to your generator — the difference between sizing the generator and sizing the hookup, explained without any guessed numbers. Questions? (330) 200-8042.
Sizing the Hookup, at a Glance
There are really two 'sizing' questions. One is how big a generator you need, which comes from what you want to run. The other — the subject of this guide — is the hookup: the generator breaker, the outdoor inlet, and the heavy cord, all matched to your generator so each can safely carry its power. You pick the generator; a licensed electrician sizes the hookup to it and confirms it at inspection. There's a printable 29-page version up top.
Common Questions
1 What does sizing the inlet and breaker mean?
It means matching the generator breaker, the outdoor inlet, and the cord to your generator's output and outlet, so each safely carries its power. Your licensed electrician does this.
2 Do I have to calculate any of this?
No. You choose a generator based on what you want to run; the electrician sizes the breaker, inlet, and cord to match it. There's no math on your end.
3 Does a bigger breaker or inlet let me run more?
No. Your generator's capacity sets how much you can run. The breaker and inlet just have to match the generator — they don't add power.
4 What's the difference between sizing the generator and the hookup?
Sizing the generator is about what you want to run (see our load-management and cost-and-quotes guides). Sizing the hookup is matching the breaker, inlet, and cord to whatever generator you choose.
5 Is the sizing part of the quote?
Yes. A good electrician includes the right breaker, inlet, and cord in the quote, and confirms it all at install and inspection.
6 I'm on a well — does that change things?
A well pump is a big 240-volt load that often pushes you toward a larger generator. The hookup is then matched to that generator. See our well-pump guide — in general terms, no numbers.
Would You Rather I Just Help?
Keeping the two sizing questions straight, gathering your generator's details, and making sure the quote includes the right breaker, inlet, and cord — that's exactly the kind of help I enjoy, with no commission on anything. Then I hand it to a licensed electrician to size and wire. $99 flat for a visit.
Would you rather I just do this for you?
No shame in it — plenty of folks would rather hand it off, and that's what I'm here for. I'll come to your home, set it up right, and make sure it's working before I leave. Flat $99 per visit — no jargon, no upsell, and every visit is 30-day come-back-free.
Not a hardware job? I can often fix it remotely for $49 — a secure screen-share, up to 2 hours, that you watch the whole time and can end whenever (included free for $39/mo Support Plan members, and it counts toward the $99 if it turns out I need to come out).