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a led light box should be with 3 lines wire or 2 lines wire?

Discussion in 'LEDs and Optoelectronics' started by SusieU, Apr 13, 2017.

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  1. SusieU


    Apr 13, 2017
    Hello all,

    A led light box like below picture, it is good or not if the wire inside only has neutral wire and live wire? what's the difference from the wire inside with neutral wire, live wire and grounding wire?
    led light box.jpg

    2 lines wire.png

    3 lines wire.jpg

    Thank you.
  2. Minder


    Apr 24, 2015
    Not sure of the regulations in China, but in most parts of the world that have a grounded neutral, any metallic case or enclosure that is AC supplied should be earth grounded.
    The exception for a 2 wire AC power supply is if the device is double insulated type.
    The neutral and earth ground should not come into contact other than the service entry or source.
  3. SusieU


    Apr 13, 2017
    Yes, i mean for other countries, like Europe or America or others.
    3 wires seems more safe.

    Minder, thank you for your reply.
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