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Green wire must be grounded for safety. The two white wires are phase and neutral.

You can discover which one is the hot wire by using a mulltimeter. But there is no needing to discover it. About the green wire only an electrician can install it properly.

It can be joined to the neutral wire, but it is not advisable for any electrical device. The correct procedure is to connect the ground wire on the recommended manner. Normally lamps do not need to be grounded.

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Q: Lamp that has 2 white wires and one green wire which one is the hot wire?
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