Identifying hot wires without markings

[Augus7us]

As I was hooking up my new electric to a disconnect box, I realized there are no distinct markings on each wire. So I have essentially 3 black wires and one smaller gauge with a green stripe.

My question is what is the best and safest way to tell which wires are which at my sub panel?

I tried wiring two of them together and doing a continuity test with my volt meter but I think the wire is just too long (about 60ft). I couldn't get a beep.

Wire is 2-2-2-4 AL URD (underground wire from the electric supply house). Wire is going to a 100amp disconnect (they didn't have a 90amp box) to the house. The wire on the other side of the disconnect going to my main panel is SER 2-2-2-4 - this wire is color coded underneath the jacket.

Only tools I have now are a voltmeter.

Thanks

-Clint

 

[Bert_]

Clip lead one wire to the ground. Test continuity at the other end, one lead to ground the other to each of the remaining wires. Label with white tape when done. 60' is no problem, I have done the same thing with wire 200' long when paralleling.

As a bit of a side note, my preference is to use normal 2-2-4 urd and then toss an extra #4 or #6 USE in the trench for the ground. The 2-2-2-4 URD is really intended for 3 phase with the yellow stripe being neutral. That's why the remaining 3 wires are all black.