How to Shut Off Power to Your House

Two things worth doing before you need this: find your main disconnect, and understand what turning it off doesn't do.

Which switch shuts off power to a house?

The one row people get wrong is fire: do not open a burning or smoking panel. Opening the door feeds it air and puts you in front of it. Leave the building.

Find it now

Do this while nothing is wrong.

Your main disconnect is usually the largest breaker at the top of the panel, often labelled MAIN and rated for the service — 100, 150, 200 amps. Some installations instead have a separate disconnect outside at or near the meter, and recent code editions require an outdoor emergency disconnect for one- and two-family dwellings. See what is a service disconnect.

Check now:

• Where the panel is, and whether there's an outdoor disconnect too
• That you can reach it without moving anything — clearance is a code requirement and the most commonly violated one. See electrical panel working clearance requirements
• That it's labelled
• Whether there's more than one disconnect — some older installations have several and no single "off"
• That everyone in the household knows where it is
• That there's a torch nearby that works

Some panels — particularly older split-bus designs — have no single main breaker at all, and require switching off several. Worth establishing before an emergency rather than during one.

How do you shut off power to the whole house?

1. Make sure you're dry and not standing in water
2. Have a torch — the lights go out
3. Stand to the side of the panel, not square in front of it
4. Use one hand, keeping the other away from anything grounded
5. Switch the main firmly to OFF
6. Verify — check a light or an outlet with a tester

Turning it back on: switch individual branch breakers off first, turn the main on, then bring branch circuits back one at a time. This avoids every load in the house starting simultaneously, and if there's a fault it identifies which circuit has it.

What stays live after the main breaker is off?

The main breaker does not de-energize everything. Still live afterwards:

• The service entrance conductors from the utility
• The meter socket and the meter
• The main lugs feeding the main breaker, inside the panel

These come from the utility ahead of any overcurrent device you control. Switching off the main and removing the deadfront does not make the panel enclosure safe.

That single fact is the main reason panel work is electrician work — see electrical work homeowners can legally do and meter socket and service entrance explained.

Also worth knowing: if you have solar, a battery or a generator, the main breaker doesn't necessarily de-energize everything downstream either. Those systems have their own disconnects, and the panel should carry labelling identifying all power sources. Locate and understand those disconnects too — see backfed breakers and the 120% rule and transfer switch explained.

How do you shut off a single circuit?

For work on a specific circuit:

1. Identify the breaker. The directory should tell you — if it doesn't, see how to find which breaker controls an outlet
2. Switch it off
3. Verify with a non-contact voltage tester at every outlet, switch and fixture you'll be working on
4. Verify again after removing a cover plate, because a box can contain conductors from more than one circuit
5. Tape the breaker off or put a note on the panel so nobody restores it

Test, don't trust the label. Directories are often wrong, rooms rarely map to single circuits, and a single box can hold conductors from several. Multi-wire branch circuits are a specific trap — the neutral can stay energized with one breaker off. See what is a multi-wire branch circuit.

While you're at it: how to label an electrical panel.

When should you not touch the panel?

Call the utility or emergency services instead if:

• The panel or meter is wet, or there's standing water near it — see water and rust in an electrical panel
• There's smoke, fire, sparking or arcing
• The panel is hot, or you can smell burning — see burning smell from an outlet
• The service drop is down or damaged — stay well clear and call the utility
• The panel is visibly damaged
• You'd have to reach across or through water to get to it
• Someone has been shocked — see water and electricity safety

In an electrical fire: get everyone out and call emergency services. Don't use water on an energized electrical fire. Only attempt a fire yourself if it's small, contained, you have the right extinguisher, and you have a clear exit.

The utility can disconnect service at their end. That's the correct route when approaching the panel isn't safe.

Situations where this comes up

Planned work — an electrician working on a circuit, or you replacing a light fixture. Circuit off, verified with a tester.

Flooding. If water is rising toward electrical equipment and you can shut off the main safely and while dry, do it. If water has already reached it, don't — call the utility.

Storm damage. A damaged drop or mast is a utility call. Stay clear.

Before evacuating, for wildfire or flood — shutting off the main is often recommended, if it's safe to reach.

A burning smell or hot outlet. Switch off that circuit if you can identify it, and call an electrician. See warm outlets and switches.

Generator use. Never connect a generator without a listed interlock or transfer switch — see backfeeding dangers and generator interlock kit vs transfer switch.

What breaks when power goes off

Worth a moment's thought before switching off for an extended period:

• Refrigerators and freezers — keep them closed
• Sump pumps — a concern if it's raining. See generator for a sump pump
• Medical equipment — plan ahead. See CPAP and medical device backup
• Well pumps — no water. See generator for a well pump
• Heating — in cold weather, freezing pipes become a risk. See battery backup for a furnace
• Alarm and security systems — battery backup is finite
• Clocks and settings on appliances

The bottom line

Locate your main disconnect and confirm you can reach it before you ever need to. Stand to the side, use one hand, and switch it firmly off — then remember that the service conductors, the meter socket and the main lugs stay live regardless, which is why an open panel is never safe just because the main is off. For a single circuit, verify with a tester at every point rather than trusting the directory. And if the panel is wet, hot, smoking or damaged, don't approach it at all — that's a utility call.

Related: what is a service disconnect.

Where to go next

• Run the numbers: home electrical load calculator