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Power cord wiring, what is each color?

I need to know which color is live, neutral and ground. Ive got a black with a yellow stripe, a blue, and a black.

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Your asking about the end that goes into the wall correct?

99% of the line cords I have seen (in the US) Have a green, white, and black wire where:

Black = Hot
White = Neutral
Green =Ground

I would suggest you use a multimeter to find which wire does what without checking it directly I would need More specifics about the laptop/power supply

Posted on Feb 20, 2009

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I think you should check the real power supply ... 120 V in and what comes out ... volts (ac - dc) and amps or what fraction of an amp.

Please compare the old with the new power supply. The new power supply should be the same volts - same kind (AC or DC) and at least the same amp rating. You can use higher amp rating but not lower - lower will burn up - literally)

Volt meter ... always set it above the suspected voltage. Batteries are always DC. Houses, buildings, etc always AC. Power supplies - could be mixed - ac in and dc out.

So if you were measuring in your home, you set the meter to 130 or higher on the AC scale. If you were doing your auto, 24 volts DC (or so).

House current, probe color doesnt make any difference. Should read about 120 Volts between the narrower (or right side/ground down orientation) or the two slots and the wider of the two shots (wide should be the neutral side - ground on the bottom). You can prove the hot side by measuring to the ground. White wire to ground = no reading. Black wire to ground = 120 volts. (The black and white are INSIDE the electric outlet. You can use either probe to do the measurement.

I hope this helps you.

If you have more question, please let me know.

Thanks for using


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