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In Reply to: RE: Two-Wire Cord is Extremely Hazardous posted by Triode_Kingdom on July 10, 2021 at 20:42:23
We were rewiring the utility and other switched outlets (all 110) on an ION IMPLANTER. The IDIOT that did the work managed a hot / neutral swap and the ENTIRE CHASSIS was HOT. Of course, he worked nites and was GONE for the next 2 weeks on vacation.
I've been around a LOT of high voltage. In E-Beam metals evaporation, the voltage is around `13kv.
I'm linking the manual. You'll see a FULL POWER Triode in the circuit. This was a WATER COOLED device and required a certain water purity since it was part of the circuit. A lot of current, too.
Ion implaneters have a 20kv Extraction PS which gets the ball rolling and the ions into the acceleration tube. Which is up to 200kv. The Glassman Power Supplies were mostly AIR as an insulator.
Wafer Fab, where I worked as a process and maintenance technician (2 differetn 'careers') was a dangerous place to work. All sorts of nasty chemistry.
So you don't have to convince TOO hard for me to go 3-wire to an amp.
I have MANY horror stories. How about a wrench dropped on the inputs of a trasnformer the size of a coffee table? Wrench simply vaporized with a VERY loud noise. Or the guy who was reaching Uder the base plate of an evaporator and got ZAPPED by the power supply? Or the METER we turned to charcoal whey measuring high voltage......I think it ARCED arounnd the HV probe shield and that was IT.
Lot smore funs stuff.
So In short? I REALLY appreciate your safety bias. Only thing? I have small bits for a DREMEL and may be able to get that hole right. I need to get a cord / relief 'set' so the cord workss with the relief.
Too much is never enough
Follow Ups:
Here's a 16-3 strain relief. 0.55 ROUND hole.
I could drill to 1/2" and GENTLY expand to correct size.......
I'd have to check out cordage, first, though.....
Too much is never enough
It's not round. The hole is either a D shape or an oval with two flat sides. That's what keeps the cord and relief from rotating in the hole. Check the data sheet for Heyco strain reliefs, you'll see what I mean. Also, there's a special tool to install these that prevents damaging the plastic. It compresses the relief into the cord while you push everything into the panel. I think you can find the tool on eBay, made by Philmore.
Coincidentally, I just ordered reliefs and 16-3 cords from Antique Electronic Supply. The part numbers are below, in case you want to look at the full descriptions. These are going into the amps I'm currently building.
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Buy Chinese. Bury freedom.
Other styles exist.......at least one for a round hole.
But I agree.. INSTALL is important and hole size critical. The one I just did on my ancient Kenwood is IN THERE for good....Well, I could get it out, but it is a real press-fit.
As the amp is issued? I'm not really in love with the simple Grommet used. That can be improved for minimal effort.
Too much is never enough
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