How often should an electrical panel be inspected?

Short answer

Have the electrical panel inspected every 3 to 10 years, and whenever something seems wrong. A home older than 40 years, or one with a Federal Pacific, Zinsco or Sylvania panel, should have it looked at now rather than waiting for the schedule, because those brands have a documented record of breakers that fail to trip. The inspection is an electrician's job: they open the panel, check every connection, and look for the heat damage and corrosion that come before a fire. It takes 60 to 120 minutes and costs $150 to $350.

Why it matters

The panel is where every circuit in the house connects to the power coming in, and it's a box full of screw terminals that have been carrying current, heating and cooling, for decades. Terminals loosen. A loose terminal makes heat, the heat loosens it more, and the end of that road is scorched insulation and a fire inside the panel. Breakers wear out too, and a breaker that won't trip when it should leaves a wire to overheat behind the wall.

None of this shows from outside the cover. An electrician takes the cover off and sees the discolored wire, the corroded bus bar, the breaker that's been doubled up with a second wire it wasn't rated for. They also recognize the panel brands with a documented history of breakers failing to trip. Federal Pacific Stab-Lok, Zinsco and some Sylvania panels are the well-known ones, and the label inside the panel door says which you have. An inspection on a healthy panel is quick reassurance. An inspection on a bad one is the cheapest fire prevention there is.

When to do it more often

The range is wide, and the house tells you where in it to land:

A home older than 40 years, or a Federal Pacific, Zinsco or Sylvania panel: have it looked at now. The brand is on the label inside the panel door, and an electrician will recognize these on sight.
A panel that's been added to over the years, with new circuits for a kitchen, an addition or a car charger: lean toward the short end.
Any of the signs below, at any time.

What you need

Nothing. The electrician brings the instruments. Clear the space in front of the panel so the cover can come off, and make a note of anything you've noticed, such as which breaker trips or which lights flicker.

Steps at a glance

Book an electrician, and clear the area in front of the panel.
The electrician removes the cover and inspects every wire termination for looseness and heat damage.
They check the breakers for the right rating on each wire, for doubled-up wires, and for signs of failure.
They look at the bus bars and the main lugs for corrosion and arcing.
They test grounding and bonding, and check the service entrance where the power comes in.
They put the cover back and give you a written list of anything that needs fixing, with the urgent items marked.

You're done when the cover is back on and you have the electrician's findings in writing.

Signs it's overdue

Breakers that trip often, or one breaker that trips on the same circuit again and again.
A panel that feels warm to the touch.
Buzzing or crackling from inside the panel.
Scorch marks or a burnt smell at the panel.
Lights that flicker or dim when an appliance starts.
Rust on the panel, which means water has been getting in.

DIY or pro

This is a pro-only job. The inside of a panel carries the full service voltage on bare metal, the main lugs stay live even with the main breaker off, and knowing what a bad termination looks like takes training. What you can do is keep the area in front of the panel clear, label the breakers so you can shut off the right one in a hurry, and watch for the signs above.

The inspection costs $150 to $350. If it turns up a panel that should be replaced, that's a larger job and a separate quote, and an electrician who inspects panels for a living will tell you honestly whether yours is one of them.

Safety

Electricity: don't remove the panel cover yourself. The screws that hold it on are near live parts, and the lugs where the service enters stay energized even when every breaker, including the main, is off. If the panel is warm, buzzing or smells burnt, switch off the main breaker if you can do it safely and call an electrician the same day.

FAQ

How often should an electrical panel be replaced?

There's no fixed age. A panel is replaced when an inspection finds damage, when its breakers are no longer made, when it's a Federal Pacific, Zinsco or Sylvania panel, or when the house needs more power than it can supply.

What are the signs of a bad electrical panel?

Breakers that trip often, a warm panel, buzzing, scorch marks, flickering lights and rust. Any one of them is reason to call an electrician.

Can I inspect my own electrical panel?

Only from the outside. Removing the cover exposes live parts, and the connections an electrician checks need tools and experience. Leave the cover on.

Does an older home need an electrical inspection?

A home older than 40 years should have its panel inspected now if it hasn't been. Panels from that era include Federal Pacific, Zinsco and Sylvania, brands with a known failure record.