Comments by "ke6gwf - Ben Blackburn" (@ke6gwf) on "Perhaps the weakest link in the US electrical system" video.

  1. Time for more corrections. Too much wrong information in this video. THHN is a specific grade of insulation in single conductor wires, specifying the temperature rating, cut protection etc. Romex is not nor does it contain THHN wire. THHN is the type of wire that will often be used to connect the meter to the main panel, or inside equipment, and is only used in conduit or inside equipment enclosures. It's what you will find on spools as individual conductors. THHN has a 90 c temperature rating, while NM/B such as Romex (which is the trade name for NM/B cable sold by Southwire) is rated at 60 C. Secondly, while Romex is often color coded THESE DAYS, the color code didn't come about until not that long ago, and even now it's a voluntary standard, so while most use it, it's not reliable, you have to read the marking on the cables. If you have an older house, chances are that all the Romex type cable will have a white sheeth. The reason a coiled up cable can overheat isn't just because of possible but unlikely lack of air flow, but, wait for it, induction and basically acting like a transformer coil.
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