Sort of OT: Grounded, current-carrying DC Conductor

brstilson · Oct 1, 2013

Have a job with a 40 Amp DC Power supply. I can find Blue #8 no problem, but I'm stuck when it comes to the common. The common will be grounded, and according to NFPA 79 14.2.3.2(1):

WHITE with BLUE stripe for grounded (current-carrying) dc circuit conductor.

The thing is, I can't find this color scheme in #8. I have to use that wire size, but I can't find anything in the code book that lists an alternative if that color isn't available.

iant · Oct 1, 2013

Are you allowed to use two or more cables in parallel - sorry I dont Know Gauge sizes

KB1GNI · Oct 1, 2013

Check this page - looks like they have some #8 stranded, white with a blue stripe, in the bargain bin:

http://www.awcwire.com/part.aspx?partname=m22759/41-8

TConnolly · Oct 1, 2013

How long?

If only a few feet then grab a permanent blue magic marker, put on a glove, pinch it against the wire and drag the wire over it. I've done that a few times for lengths of up to a couple of dozen feet for larger wires where its not practical to purchase a whole roll of striped wire.

jstolaruk · Oct 1, 2013

Or use white #8 and at the last 10-12" of each end, wrap a thin blue tape barber-pole style.

Timbert · Oct 1, 2013

I get white wire with blue stripe from WEICO. They will stripe any wire (up to three colors) that they make for $15 a spool (100' or 1000'). They have MTW all the way up to #4, THHN up to #2/0.

Timbert · Oct 1, 2013

Sorry, the correct URL for WEICO is http://www.weicowire.com/

Archie · Oct 1, 2013

www.awcwire.com has been a good source for me. They have found some really odd wire types and colors for me. If it wasn't stock, they made it with typically a one week turn around.

Sort of OT: Grounded, current-carrying DC Conductor

brstilson

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iant

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KB1GNI

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