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sutha.karan80
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Join Date: Nov 2010
Posts: 2

480 VAC 3Ph 3W 60Hz System

06/14/2011 11:22 AM

Dear Sir,

I am going to provide incoming indication 220 VAC pilot light in my panel.But the system is 480 VAC delta connected system.I do not want to provide transformer type pilot light or separate 3 phase step down transformer.we are planning to connect R phase - pilot light 1 live wire, Y phase-pilot light 2 live wire, B phase-pilot light 3 live wire and all the neutral line(pilot light another line) short circuited.That is STAR CONNECTED LOAD.Can you please advise about voltage across the load.is this possible way to get indication?
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wareagle
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#1

Re: 480 VAC 3Ph 3W 60Hz System

06/14/2011 12:51 PM

You can not use a 220 volt light without a 480 volt to 220 volt transformer. If the system is delta you do not have a neutral.
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JRaef
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#2
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Re: 480 VAC 3Ph 3W 60Hz System

06/14/2011 1:11 PM

Even if you do have a Neutral (Star system), the voltage will be 277V, not 240 and the lamps will burn out.

Why not use a "transformer type" pilot light where there is a very small transformer on the back of the device? Those are available for 480V and are very common. That's the way it has been done since the dawn of electricity. You can even get those now that have LED bulbs so they last virtually forever.

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KJK/USA
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#3

Re: 480 VAC 3Ph 3W 60Hz System

06/14/2011 2:29 PM

I agree with wareagle and JRaef.

Link

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cuba_pete
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#5
In reply to #3

Re: 480 VAC 3Ph 3W 60Hz System

06/14/2011 6:18 PM

Have fun looking in the catalogs? Did you get paid?
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SimpleMind
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#4

Re: 480 VAC 3Ph 3W 60Hz System

06/14/2011 2:35 PM

At 3W you don't need to worry about any of that. (lol) S.M.

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harry potter
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#6

Re: 480 VAC 3Ph 3W 60Hz System

06/15/2011 6:12 AM

All true.

But you may use suitable resistor for current limiting. Old method. Not an efficient way for bulk use. But in emergency, typical case, you may do. Best is use transformer.

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