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In the US, Blue wires are most commonly used for 24VDC control circuits and 208/277VAC lighting applications.

BE CAREFUL - Blue wires are not common within residential construction.

If you run across a single Blue wire at a residential location you may have discovered a "custom" installation. Blue (24VDC) wires may be included in a color coded set of wires used to connect low voltage devices such as thermostats, security alarms, cameras, telephones, computers, etc.

BE CAREFUL AGAIN - Blue wires at a commercial / industrial site could be anything. There's a big difference between 24VDC and 277VAC.

You probably shouldn't touch the wire. Even if its safe you could mess up some expensive equipment. But if you were me, you could trace the wire to its source / destination and put a meter on it.

Answer 2In Europe, a blue wire is used in mains wiring and means that it is neutral.

European standard -

Blue = Neutral

Black = Live (230v)

Brown = Earth

UK domestic wiring -

Blue = Neutral

Brown = Live (230-240v)

Yellow/green stripe = Earth

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12y ago
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Wiki User

10y ago

Assunimg you're talking about the UK domestic wiring system...

Brown = Live

Blue = Neutral

Green/Yellow = Earth

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3y ago

yellow

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