Map the panel yourself on a quiet afternoon with a lamp and a helper. It costs nothing, it is the first thing any electrician will need, and in an emergency knowing which breaker kills which room matters.

This is most common in homes built before about 1940. Pre-war construction — galvanized supply, cast iron drains, cloth-wrapped wiring, ungrounded circuits.

You can handle this one yourself. No call needed.

Related

• Federal Pacific or Zinsco panel
• Two-prong outlets throughout the house
• Cloth-covered cable visible in the attic or basement
• Fuse panel, or a 60 amp service
• Fuse larger than the wire it protects
• Ceiling fan mounted to a standard light box
• Knob-and-tube still energised
• No GFCI protection anywhere in the house

Back to Electrical.

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Written by Jaylan Jones. I Like To Fix earns a referral fee when a call connects to a contractor. See our business-model disclosure.