I'm running a new sub-panel to my basement (the main panel is in the garage). I bought a 500' spool of 6 AWG THHN. The distance to the sub-panel is about 110' so I cut the spool into 4 x 125' lengths. I was planning on using one of the THHN cables as the ground. I just wanted to confirm that it would not be an issue running an insulated wire as the ground. I don't see why it would be a problem but just wanted to double check.
And as a follow-up, I saw one place that if you are using 6 AWG or larger you must use different colored cables. The spool I purchased is all black and I color coded each cable every couple of feet with colored tape. Is that going to be a problem or is that more of a inspector-by-inspector issue?
Best Answer
You have it backwards the larger sizes are allowed to be re identified not the smaller sizes. 6awg and smaller need to have the proper color insulation 250.119.A . The ground is allowed to be solid, stranded insulated or bare. But if insulated 4 and above can be reidentified at the terminations and splices.