I read several color coding guides but I am not sure which wire goes where... My guess is that the black is the L wire, which stands for Live, and the white wire is the N, which stands for Neutral, and that I should ignore the blue wire:

enter image description here

So Black on L, White on N, blue stays disconnected.

Is that correct?

Thank you!

  • \$\begingroup\$ looks more like aqua green (blue-green) ( = earth ground) otherwise ok. ,....Solder dipped to prevent oxidation. Actually Live is ok but Line 1 is L1 or simply Line. also called Hot (black) \$\endgroup\$ Commented Oct 17, 2017 at 17:10
  • 3
    \$\begingroup\$ What is on the other end of those wires? \$\endgroup\$ Commented Oct 17, 2017 at 17:11
  • \$\begingroup\$ @AndrewMorton Oh, I'm sorry I actually left that out! It's a regular 3 pin plug, NEMA 15-5P \$\endgroup\$
    – Edy Bourne
    Commented Oct 18, 2017 at 0:34

1 Answer 1


Typically the ground is green, not blue, but you do have the colors correct in the general sense (L black and N white). If the transformer doesn't have an input for the ground that will likely need to go somewhere else for safety so although the hook up is neglected for the transformer it is very likely still required elsewhere.

As for the voltage of the wire. If you are in the USA and that wire is in a standard plug, you should go to the 110V setting

If you are not sure of the voltage, you will want to use a multimeter to check the value of the voltage, and that will give you confidence in the value. You can stick the leads directly into the socket or on the wires themselves, just be sure to be safe.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.