Plain-English electrical guides

Your home’s wiring, explained in plain English.

Electrician Help Now is a library of 73 guides on panels, wiring, repairs, and installations. Each one explains what is happening behind the wall, what you can safely check yourself, and which jobs belong with a licensed electrician.

Before you open the panel

  1. Kill the power at the main breaker

    Switch off the main breaker before you open a cover or touch a circuit, then confirm the power is dead at the outlet or fixture.

  2. Treat every wire as live

    Check outlets, switches, and bare wires with a non-contact voltage tester. A dead-looking circuit can still be fed from somewhere else.

  3. Keep yourself out of the circuit

    Stand on a dry surface, use insulated-handle tools, and keep one hand free instead of gripping metal or a water pipe.

  4. Match the job to your skill

    Swapping a like-for-like outlet or switch is homeowner work. Anything inside the panel or behind the wall usually is not.

The service wires feeding the main breaker stay live even with the main switched off. If a job means removing the panel’s inner cover, stop and call a licensed electrician.

When to stop and call an electrician

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Questions we hear most

How can I tell if my thermostat is bad instead of just wired wrong?

With power on, briefly jump a wire between R and W at the wall plate or control board. If the furnace fires immediately, the thermostat is the likely failure point. If nothing happens, the fault is upstream in the wiring or transformer.

Do electric fireplaces need special wiring?

The wire itself is ordinary. What they need is capacity. A 1,500 watt unit draws about 12.5 amps, past the 12 amp continuous limit of a 15 amp circuit, so it usually needs its own 20 amp circuit. Hardwired and 240V models always need new wiring run by an electrician.

How much does it cost to rewire a 1,500 square foot house?

Roughly $8,000 to $15,000 for a full rewire, more if the panel also needs replacing or walls are hard to access.

Can I still use other outlets on the same circuit if one smells like burning?

No. The overheating connection is usually inside a box you can't see, and the other outlets on that run may be fed straight through it. Loading them pushes more current into a spot that is already too hot. Leave the breaker off until an electrician inspects the circuit.

How often should I get an electrical inspection?

Every three to five years for most homes. Homes 40 years old or older should be checked every one to two years. Schedule one after any major renovation before the walls close.