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Brown = live (hot) - (equivalent to Red wire)

Blue = neutral - (equivalent to the Black wire)

Yellow and green = earth.

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However never rely on the wire colors - you should test the wires with a meter to be sure that the person before you has not made a mistake further back in the wiring.

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Q: Which is the Hot wire and which is the Ground wire if the wires you see are a Brown and a Blue wire?
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