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Author Topic: This Box Could Kill You  (Read 770 times)

Kevin Graf

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This Box Could Kill You
« on: May 29, 2014, 11:54:20 am »

A new article in Radio World

"This Box Could Kill You"
by John Bisset
on 05.28.2014
- See more at: http://www.radioworld.com/article/this-box-could-kill-you/270613#sthash.vFUmtTQX.dpuf
http://www.radioworld.com/article/this-box-could-kill-you/270613

The conversation during a spring NAB Show workshop turned to tightening fuses and disconnect box connections.

.........this picture of a three-phase electrical service, fed underground via the PVC conduit at the bottom of the panel. Cabling runs up to the knife switches at the top of the panel, then down to the fuses and finally into the building through the lower conduit exiting the rear of the panel.
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Mike Sokol

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Re: This Box Could Kill You
« Reply #1 on: May 29, 2014, 01:13:24 pm »

"This Box Could Kill You"
by John Bisset
on 05.28.2014
- See more at: http://www.radioworld.com/article/this-box-could-kill-you/270613#sthash.vFUmtTQX.dpuf
http://www.radioworld.com/article/this-box-could-kill-you/270613

Thanks for posting the link. Remember that anyone connecting into Cam-Locks is potentially at that kind of energy level. I once had a 3-p/480-v/4-0 feeder line with 200 amp breaker get pinched in a conduit pull (yes, it was live at the time) which blew open a big section of conduit and vaporized much of a big cast "elbow". One chunk of metal from the explosion flew about 100 yards through the air and punched a hole in the metal wall. Lucky for me it was 100 yards away from my crew pulling the new wires, but it sounded like a bomb going off in the warehouse. I've learned a lot since then about arc-flash explosions. You don't want to be anywhere near one when it goes off.

Jeff Bankston

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Re: This Box Could Kill You
« Reply #2 on: May 29, 2014, 01:33:49 pm »

around 1980 we were wiring a j.c. penny store. the switch gear was PFE and i was told it was not legal to sell in the US at the time and j.c. penny had supplied it. i was hired on after the gear had ben installed. i was a helper at the time. we had 2 melt downs on that job. the first was after the ......... i have to go i will finsih this later
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David Elsbury

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Re: This Box Could Kill You
« Reply #3 on: June 08, 2014, 02:37:35 am »

around 1980 we were wiring a j.c. penny store. the switch gear was PFE and i was told it was not legal to sell in the US at the time and j.c. penny had supplied it. i was hired on after the gear had ben installed. i was a helper at the time. we had 2 melt downs on that job. the first was after the ......... i have to go i will finsih this later
Have to say I'm a bit confused as to why you'd make half-a-post... planning on getting around to finishing it? I'd like to hear what happened :)
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