"Use insulation to cover burrs:"
When dragging out holes for feed through panels, try using the insulatuion off a #6 THHN or larger to cover up the sharp edges on the holes. Take a #6 (or whatever size would be adequate, usually #6 or whatever you used for a ground) and skin the insulation off the wire, where it will be split down the middle. Cut off desire length (this would be the length that would cover the drugged out hole) and start on inside of the hole with the split of the insulation to the hole and fit the insulation around the hole until the entire hole is protected. If you use the right size insulation, it should fit like a glove.
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Tricks of the trade
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