240/415 Vac Distribution System

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kwhitehead

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Anyone,

In a typical 415V power distribution system is the supply feeder 415/240V Wye? Or, do I need to request this type of feeder from my customer? I have several 415V motors and several 240V motors I need to control. I would like to power the 240V motors directly from my 415V supply (Phase to Neutral) - is this an acceptable method for 240V motor power or do I need to install a 415V/240V step-down transformer? If acceptable to power the 240V motors directly, do I need a 2P breaker (HOT and Neutral), or just a 1P breaker on the HOT side?

Kevin
 
Re: 240/415 Vac Distribution System

I can?t imagine how a 415/240Y system could be described as ?typical.? I?ve never encountered such an animal. I concede that dividing 415 by 240 gives the proper 3-phase ratio of 1.73 (i.e., the square root of three). Your use of the word ?customer? tells me that you install your system in facilities owned by others. Do you often find customers that have 415V available? I think that it is far more likely that your customer would have a 480/277Y configuration, meaning that your motors will be getting more voltage than you are expecting.

To answer part of your question, if you need 240V single phase, and if you do indeed have a panel with a 415/240Y configuration, then a single pole breaker on the hot would be appropriate. But you are far more likely to find that the available 240 volt source is a 240/120V single phase configuration. To get 240V from this configuration, you need a 2-pole breaker.
 
Re: 240/415 Vac Distribution System

this voltage is very common in european areas like U.K. and France both use 415/230 volts system and it run at diffrent frecenty too in north american area run at 60 hz and european and few other country do run at 50 hz so the voltage will be diffrent with this hz

merci marc
 
Re: 240/415 Vac Distribution System

Thanks to all who replied. Sorry for not providing more information. Customer is in Europe and has stated the feeder is 415V 50Hz. I believe the feeder is actually 415Y/240V 50Hz. I guess I will create my drawings assumming I can power the 240V motors directly from the 415V source and I will use 2P breakers for the 240V motors (Phase to Neutral). If my assumption about the power is incorrect, then I am sure my customer will correct me.

If anyone has anything more to add, please do so now. Thanks.

Kevin
 
Re: 240/415 Vac Distribution System

We had to do a resistive load test at the Japanese embassy on a Toshiba ups 415/240, Course our load banks are 208 and/or 480. I did not want to rewire the controls (the resistive elements would not care but the motor and contactor coils might not like it) so we used step down step up transformers changing the taps till we got to 480 VAC. The witnessing engineer was a little unsure of the arrangement, BUT all went well.
 
Re: 240/415 Vac Distribution System

i will like to add a note here some area have some kind of power restiction to motor slection but for small ones 240 volts will be fine but when get bigger one better off to run on three phase 415 volts or get motor set up on 415 volts single phase ( that is kinda of rare but check the motor manufacters sometime can make a comustom made voltage connetion for you ) but best guideline is check that area where you will send the machery to them and check their regulations what need to meet iec codes and note it is not the same as NEC codes are so check it ahead and make sure all the overcurrent devices are marked for " EC" label or "IEC" one of two i am not sure


merci marc
 
Re: 240/415 Vac Distribution System

Kevin,
Feeder is almost certainly 400V, not 415V, unless the costumer has his own transformer. The voltages used to be 380V and 415V. People still use these terms, just like a lot of people incorrectly use 110/220/440V for the American voltages. Nitpicking, I know, but sometimes it can make a difference.

In a typical 415V power distribution system is the supply feeder 415/240V Wye?
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Yes. It is common to refer to the 230/400V wye system as 400V or 0.4kV. 3-phase 400V only is possible, but I'd expect it to be about as common as 208V or 240V only in the US.

I would like to power the 240V motors directly from my 415V supply (Phase to Neutral) - is this an acceptable method for 240V motor power?
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Definitely. Allmost all single phase loads in Europe including motors are connected like this.

(Just like Marc point out, there are some 400V single phase loads.)

If acceptable to power the 240V motors directly, do I need a 2P breaker (HOT and Neutral), or just a 1P breaker on the HOT side?
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Depends on country and/or earthing (grounding) arrangements. 415V hints that the country is Great Britain. It accepts 1P breakers but there is nothing wrong with using 2P breakers.

Marc,
you mean "EN or IEC".
 
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