Illustration: Ian Warpole
Undergrounded (2-pronged) receptacles means your home has no way to safely conduct stray current
9. Ungrounded (2-prong) Receptacles

What it means: Your house's wiring has no way to safely conduct any stray current that escapes the confines of the wires.

Code violation? No; grandfathered in. (Today's code requires grounded circuits and receptacles.)

Danger level: Minimal, as long as you don't use an adapter to fit a three-prong plug into a two-prong receptacle. Doing so could destroy the device you're plugging in, and increase the chance of electrocution.

Solution: Replace two-prong receptacles with properly grounded three-prong ones, if wiring allows it (see . Also, test all existing three-prong receptacles with a GFCI circuit tester to make sure they're grounded. Rewire any that aren't.

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