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Thread: LED: wire colors?

  1. #1
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    LED: wire colors?

    Friend of mine receives light fixture with yellow/green stripe wire,(earth gnd), then a blue and a brown lead? Being in the industrial construction field mostly, I am not familiar with these colors and am hoping for guidance from the experts on here. Thanks and merry Christmas, Paul.

  2. #2
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    IEC standard:
    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

  3. #3
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    I agree IEC colors - might want to make sure the thing is listed in the US. If so, probably doesn't matter which conductor connects to what other then the EGC.

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    I used to maintain equipment/machinery from Europe and in all cases the brown was line (hot) and blue was neutral. Now some it didn't matter if they were reversed but for consistency I kept them wired the same.
    If you aim at nothing, you will hit it every time!

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    very helpful, thanks!

    the members, contributors on this forum make it great, thanks fellas!

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    Quote Originally Posted by Little Bill View Post
    I used to maintain equipment/machinery from Europe and in all cases the brown was line (hot) and blue was neutral. Now some it didn't matter if they were reversed but for consistency I kept them wired the same.
    Keep in mind in European installation it will be 240 volts line (hot) to neutral. A typical 240 volt two wire circuit in the US will be using two ungrounded lines, unless you used a transformer to derive 240 volts that is grounded at one end instead of at the center of the winding.

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    Quote Originally Posted by kwired View Post
    Keep in mind in European installation it will be 240 volts line (hot) to neutral. A typical 240 volt two wire circuit in the US will be using two ungrounded lines, unless you used a transformer to derive 240 volts that is grounded at one end instead of at the center of the winding.
    No, these machines either were totally 120V line to neutral or a mixture of line-line 208V-240V or line to neutral 120V.

    But I am aware of Europe's 240V line to neutral voltage.
    If you aim at nothing, you will hit it every time!

  8. #8
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    Quote Originally Posted by Little Bill View Post
    No, these machines either were totally 120V line to neutral or a mixture of line-line 208V-240V or line to neutral 120V.

    But I am aware of Europe's 240V line to neutral voltage.
    My point was more that if installed in Europe they would connect the blue to neutral, but typical 208-240 volt install here doesn't utilize the neutral conductor and really is no correct polarity, unless the machine for some reason requires one conductor to be grounded - then you about have to have an isolation transformer to derive 240 with a grounded lead.

  9. #9
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    Quote Originally Posted by infinity View Post
    IEC standard:
    I see this color scheme on a lot of 24V photo eyes and proxes as well. So is the voltage not relevant on the IEC chart?

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    Quote Originally Posted by kwired View Post
    ... unless the machine for some reason requires one conductor to be grounded - then you about have to have an isolation transformer to derive 240 with a grounded lead.
    Would this have to be an isolation xformer? Couldn't this application also be done with an autotransformer?

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