Interlock Kits, Explained - A Plain-English Guide
Last verified: September 2026
How an interlock kit actually works, what it needs, and how you'll use it during an outage — the deep dive on a simpler, more affordable panel hookup. Rather talk it through? My number is (330) 200-8042.
Interlock Kits, at a Glance
An interlock kit is a simpler, more affordable way to get generator power into your home's whole panel — a small sliding plate that mechanically prevents your main breaker and a generator breaker from ever being on together. This guide walks through what it is, how it's installed, and exactly how you'll use it during an outage. There's a printable 29-page version up top.
Common Questions
1 What does an interlock kit actually do?
It's a sliding plate at your breaker panel that mechanically prevents your main breaker and a dedicated generator breaker from ever being switched on together, so generator power can never flow backward onto the utility lines.
2 Is an interlock kit as safe as a transfer switch?
Yes — both prevent generator and utility power from ever meeting, which is the core safety job. A transfer switch adds labeled, dedicated switches on top of that same safety idea, for more convenience at a higher typical cost.
3 What does my panel need for an interlock kit?
A compatible panel brand and layout, room for a dedicated generator breaker, and an outdoor power inlet. A licensed electrician evaluates your specific panel before the job begins.
4 Do I need a permit to install one?
In most areas, yes — adding a breaker and wiring an outdoor inlet is panel work, and it typically needs a permit and inspection to confirm it was installed correctly.
5 How do I use it during an outage?
Start the generator outside, plug in the one heavy cord, turn off the main breaker, slide the plate and switch the generator breaker on, then turn on your chosen circuit breakers one at a time. Reverse the steps once utility power returns.
6 Can I upgrade to a transfer switch later?
Often, yes, though it's typically its own installation rather than a simple swap. Ask an electrician about your specific panel if that's a road you might want to go down someday.
Would You Rather I Just Help?
Deciding on an interlock kit, planning your breaker order, and lining up the electrician is exactly what I help with. I'll look at your home and your must-run list, with nothing to sell you. $99 flat for a visit, 30-day come-back-free.
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).