I Have Two Black Wires Which One Is Hot

The switch just open the circuit to turn off the light or closes the circuit to turn it on.

I have two black wires which one is hot. However the nec has only one requirement and that is that the neutral wire must be white or gray. The black wire is the hot wire and comes in to one side if the switch and goes out the other side. Ok a light switch is different then a outlet plug. On this multimeter you use the setting in the lower right to measure ac voltage.

Mapping out mystery wires is different depending on whether you re dealing with 110 or 220. To find the right wires on a speaker check to see which colors you have. Light fixtures manufactured in the united states must follow the color coding rules established by the nec. I have two black wires running to a light switch that i need to extend about a foot.

The united states has strict codes relating to home wiring including clearly defined colors on the outer casing of the wires. However if you need to rewire a light switch or a plug socket you may occasionally come across two black wires. Black means hot white signifies neutral and green indicates ground. Tour start here for a quick overview of the site help center detailed answers to any questions you might have meta discuss the workings and policies of this site.

The hot wire in a 120 volt residential ac circuit usually is coated with black insulation while the return or neutral wire is white.