ECN Forum Forums General Topics of the Trade General Discussion Area Listed Hardware for Landing Lugs as GND?

Attic Rat ... caught the 1/4-20 part of the response, ignore the 10-32 portion of the post above. Great Suggestion!

I don't know about the specific UL standard covering the device you are wiring up, but one standard (UL 60950) requires "at least two complete threads into a metal plate, a metal nut or a metal insert" for "screws for electrical contact pressure". Going by that, a 20 thread per inch screw could only be used on minimum .100" metal enclosure. .1 inch is pretty thick - you may not have that much. (I measure .090" on a GE panel in the room I am sitting in right now - that includes the paint) Maybe a finer pitch screw would be in order here.

Although maybe not worth the trouble for fast-track construction work, these are a cool way to bond without tedious paint scraping… Internal-External Tooth Washers — Teeth on both sides let you use washer... for electrical bonding. www.mcmaster.com/param/asp/psearch....,104=4054;138=63200;1515=63023;931=39319

Sez who? Where is the UL bug?