in fairness their voltage classifications are fairly odd, and it's hard to find solid motivation to use them unless you're filling in relevant paperwork etc.
NT
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3 years ago
Energy savings, do you care?
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3 years ago
On Saturday, August 8, 2020 at 3:40:12 PM UTC-4, snipped-for-privacy@downunder.com wro te:
able#
hes.
Have you seen the damage when a nearby lightning strike induces voltage int o a paralel wire run? I had a strike on a metal barn. It tripped the main c ircuit breakers for the property. It was parallel to the coax for a satelli te dish, and they were over three feet apart. It fried the Sat receiver. It then jumped into the telephone line. It fried the SLIC, and the five+ mile s of copper to the Central Office. Everything met code, but the induced cur rents did thousands of dollars of damage. It even fried a new SVGA monitor that wasn't connected to anything. The video cable was wrapped around the b ase, and there was no power cord. It fried the video input circuits. It als o caused a battery powered digital thermometer to explode, and it was over
100 feet from that barn.- Vote on answer
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3 years ago
A non-arbitrary number that stickes in my mind is that arcs above about 300 Vac will not self extinguish.. This is part of the reason that arc flash is a big deal at 470 Vac, but not so much at 240 Vac.
I don't know thw corresponding voltage for DC, but assume that it's lower, for lack of zero crossings.
Joe Gwinn