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Tool Talk Discussion Forum

Re: 480V 3 phase to 240V single phase

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David G

07-18-2013 19:45:52

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You would use one of the phases on 480V to get 240V single phase.

How many watts do you need?

480V is VERY dangerous, it will cause 3rd degree burns if arc flashed. It is NOT recommended that any NOT trained person touch it.

The primary and secondaries should be fused. The primary fuse protects the wiring and primary side of transformer, the secondary fuse protects the secondary side of the transformer and the wiring out.

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John T

07-19-2013 15:51:38

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 Re: 480V 3 phase to 240V single phase in reply to David G, 07-18-2013 19:45:52  
"480V is VERY dangerous," I have to agree with that. If its straight three phase three wire floating UnGrounDED DELTA, coming in contact with two legs at the same time IS SURE DANGEROUS and 480 volts worth.

If its a GrounDED 480Y 277 V Three Phase Four Wire system, coming in contact with one hot phase and ground (fairly easy to do if inexperienced or wreckless) yields 277 volts STILL DANGEROUS while coming in contact with two hot phase legs would be needed to get the full 480 MORE DANGEROUS Yikes


John T

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Billy Shafer

07-20-2013 05:04:34

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 Re: 480V 3 phase to 240V single phase in reply to John T, 07-19-2013 15:51:38  
It can also make you talk funny.

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dr sportster

07-19-2013 09:47:40

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 Re: 480V 3 phase to 240V single phase in reply to David G, 07-18-2013 19:45:52  
David , It is also recommended that trained persons don't touch it either, lol. Most people are suffering a 277 volt shock as unless you fell inside a panel or welder its hard to touch 480[ both phases] by mistake.

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07-19-2013 09:32:59

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 Re: 480V 3 phase to 240V single phase in reply to David G, 07-18-2013 19:45:52  
There is lots of 347/600V around too. Then again in Europe there is no 120. It"s 110/380 to 240-416.

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