Can 3 phase be 200 V not 380 V ?

[path2heaven]

Hi there ,

I'm working on a new project since 2 days , and in B.O.Q. I found items saying :

Disconnect switch fusable, 60A,220V, 3PH

Disconnect switch fusable, 100A,220V, 3PH

is this right ? can the three phase be 220V not 380V ?

 

[jraef]

Yes. All over the world.


"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington

 

[Mbrooke]

Phase to phase voltages tend to range anywhere from 208 to 1000 volts.

220/380, 230/400, 240/415Y are by far the most common in Europe and what you encounter 96% of the time.

400/690Y exists in some large industrial.

Some areas like Norway have unearthed (IT) 230 volts phase to phase with 400 and 690 IT for industrial.

Some parts of the world l like Brazil use 127/220Y instead of the more typical 220/380.

If you are in North America you will find a wide variety of 3 phase voltages:

120/208Y, 120/240 delta high leg, 240/416Y, 240/480 delta high leg, 277/480Y, 347/600Y along with 240,480 and 600 volts ungrounded delta.

In a nut shell phase to phase voltage vary with 220 volts being very normal in some places.

Although I do understand, the fist time you see something that you have not encountered before you step back scratching your head.

 

[path2heaven]

thanks guys

you made my day , really appreciated

and I'm working in Dubai , UAE .. but i'm fresh graduated so I've a lot to learn

 

[Mbrooke]

Welcome

 

[waross]

And in North America, you will find that equipment rating differs from nominal supply voltages.
Disconnect switches, cables, breakers and other equipment may be rated at 250 Volts, suitable for use on 120 Volts, 208 Volts, 240 Volts and any other voltage below 250 Volts.
There are also ratings of 500 Volts, 600 Volts and 1000 Volts.
Common utilization voltages in North America are multiples of 120 Volts, 120 Volts, 240 Volts, 480 Volts and 600 Volts.There are exceptions based on √3 for line to neutral voltages and 120:208 Volts.
Then there are motors:
Motor voltage ratings allow for voltage drop between the supply transformer and the motor of approximately 4%.
So, while nominal supply voltages are based on multiples of 120 Volts, Motor nominal voltage ratings are based on multiples of 115 Volts.
115 Volts, 230 Volts, 460 Volts and 575 Volts.
And finally, there are the motors for use on 120:208 Volt systems. You will see motors rated for 200 volts, 208 Volts, 208/230:460 Volts and 200:230/460 Volts.
347 Volts, 575 Volts and 600 volts are common in Canada but not in the US.

Bill
--------------------
"Why not the best?"
Jimmy Carter