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today's safety video




 
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Patrick J. / KD5OEI
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« on: April 05, 2022, 02:54:34 AM »

most restaurants are 277V? ouch

https://www.reddit.com/r/WinStupidPrizes/comments/tw15p8/cutting_a_live_wire/
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Radio Candelstein - Flagship Station of the NRK Radio Network.
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« Reply #1 on: April 05, 2022, 08:25:02 AM »

definitely 2xx something.  Quite the flash and the 2 pops could be indicative of 2 hot conductors.
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Bob
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« Reply #2 on: April 05, 2022, 12:55:42 PM »

Well, 277v is one leg of 480v 3phase.  At least in the US.

In most of Europe, it is 380/220.

Not sure where this happened.

73DG
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« Reply #3 on: April 05, 2022, 01:03:30 PM »

I had an electrician (supposedly....  Idiot couldn't even run a screw gun) blow himself off a ladder by being hit with 277.

Hes lucky the meth kept his heart going.

Idiots.

--Shane
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Tom W2ILA
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« Reply #4 on: April 10, 2022, 07:36:25 PM »

Is that the same guy that got double dog dared into licking the metal phone pole during that icy winter  of 52?
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flintstone mop
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« Reply #5 on: April 18, 2022, 05:55:44 PM »

you could see that he was preparing for a large flash.
I worked in a building where they shipped 277 around. Advantage??? You can use smaller gauge wire around the building?
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Fred KC4MOP
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« Reply #6 on: April 18, 2022, 08:04:14 PM »

The advantage with 277 is in simplified lighting circuits.

If the facility has 480V 3Ph, you take each leg and neutral and split up the load among L1 L2 L3  to balance the lighting fixtures.

It makes a difference in things like schools, factories, and large stores.

Beats using iron to get it down to 120V.

73DG
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« Reply #7 on: April 20, 2022, 06:35:32 AM »

The advantage with 277 is in simplified lighting circuits.

If the facility has 480V 3Ph, you take each leg and neutral and split up the load among L1 L2 L3  to balance the lighting fixtures.

It makes a difference in things like schools, factories, and large stores.

Beats using iron to get it down to 120V.

73DG

This, right here.

You design a 20 amp circuit to be loaded to 16 amps.

You get LOTS more lights on a 277 16A circuit than you will on a 120 16A circuit.

Which translates into a lot less wire, a lot less conduit, a smaller panel with less breakers, less time paying me to land all that additional wire in a panel.

277 is just a lot more economical when you have it.


--Shane
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« Reply #8 on: April 20, 2022, 10:53:46 AM »



And fewer light bulbs get stolen.


Oh, sorry, I mean. 'lamps'.

klc
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« Reply #9 on: April 20, 2022, 05:44:00 PM »

That, will leave a mark. ⚡💥😲
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