The Inlet Box and the Generator Cord
Last verified: September 2026
The inlet box and generator cord are the weatherproof link between the generator in your yard and the panel inside — so you never run a cord through a window or open the panel yourself. Here is how the pieces fit, in plain English. Rather talk it through? My number is (330) 200-8042.
The Inlet Box and Generator Cord, at a Glance
A power inlet box is a weatherproof outdoor outlet on your house wall that a heavy generator cord plugs into, feeding your interlock or transfer switch inside. It means you never run a cord through a window or open the panel yourself — the connection stays outdoors and dry. The cord should be long enough to keep the generator a full 20-plus feet away with its exhaust pointed off, and a licensed electrician wires the inlet as a permit job. There's a printable page-by-page version up top.
Common Questions
1 What is a generator inlet box?
It's a weatherproof outdoor outlet mounted on your house wall. A heavy cord from the generator plugs into it, and inside the wall it connects to your interlock or transfer switch — so power crosses into the house in one safe, dry, sealed spot instead of through a window or an open panel.
2 What kind of cord do I need?
A heavy, outdoor-rated locking cord matched to your generator's outlet on one end and your inlet on the other. The exact type depends on your equipment, so ask the electrician who installs the inlet or check your generator's manual rather than guessing at a part number.
3 How long should the generator cord be?
Long enough to reach the generator in its safe spot — at least 20 feet from the house, exhaust pointed away — with a little slack. Not so long that it becomes a trip hazard or drops voltage on a heavy load. The safe distance sets the length; never move the generator closer to fit a short cord.
4 Can I install the inlet box myself?
No. The inlet wires into your panel through an interlock or transfer switch, which is a licensed electrician's job and, in almost every area, a permit job with an inspection. It's how you know the connection is safe and your insurance stays valid.
5 Where should the inlet box go?
On an exterior wall near the panel, up off the ground, reachable from the generator's safe spot, and somewhere it stays dry and easy to get to. A short, direct path to the panel keeps the wiring simple. Your electrician will confirm the exact spot.
6 Do I need an inlet box if I already use extension cords?
Not necessarily. If you only run a few things, outdoor-rated cords straight to appliances can be enough. An inlet becomes worth it when you want one clean, permanent connection to your panel instead of several cords — see our extension-cords, interlock-kit, and transfer-switch guides.
Would You Rather I Just Help?
Planning where the inlet goes, picking a cord that matches, and lining up a licensed electrician to wire it — that's exactly the kind of thing I help with, then I show you the simple routine for storm nights. $99 flat, 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).