three phase

[d1reyad]

can three phase equipment work on a service with a high leg which is 240v to neutral from the the B phase

 

[StephenSDH]

Yes, that is the only purpose of having the high leg. It is only useful for three phase loads. It is 208v to neutral.

 

[brian john]

can three phase equipment work on a service with a high leg which is 240v to neutral from the the B phase

What is the voltage rating of the equipment? And as noted it is 208 VAC not 240 VAC.

 

[ceb58]

Yes, that is the only purpose of having the high leg. It is only useful for three phase loads. It is 208v to neutral.

It will read 240v ph to ph. doesn't matter if its 240v 1ph or 3ph. Its the 120v circ. you have to be careful where you land them

 

[d1reyad]

is the first time i am doing a service like this i just wanted to know if 3 phase equipment would work with out any problem also you guys said is 208 not 240 ?

 

[kbsparky]

It is 240 V 3 phase. Measuring voltage across any 2 lines = 240 Volts.

The high-leg is 208 to neutral.

 

[RETRAINDAILY]

What a pain those are I'm currently upgrading a factory from the 40s they have 480v with 240v transformers everywhere it's the 1 phase equipment you have to be careful of.
We are changing them out to 208/120v.

 

[d1reyad]

so i wont have any problem if i have a 208V AC 3-phase equipment on this panel or a 240v 3phase equipment it should work fine ?

 

[kbsparky]

Not sure if you will have any problems or not using 208 Volt 3 phase equipment. If it is only rated at 208 Volts, you could possibly have an issue. Depends on the equipment, and its tolerance for different supply voltages.

 

[RETRAINDAILY]

so i wont have any problem if i have a 208V AC 3-phase equipment on this panel or a 240v 3phase equipment it should work fine ?

Better then 208 IMO just watch your stinger don't hook up to something 120v in the panel.
slim possibility But I always look.

 

[augie47]

is the first time i am doing a service like this i just wanted to know if 3 phase equipment would work with out any problem also you guys said is 208 not 240 ?

If it's a 240 volt 3 phase delta with a high-leg, the voltage between any of the phases (phase to phase) will be 240 volt. The voltage to neutral (ground) on the high-leg (B Phase) will be 208.
As mentioned, you need to be careful that no 120 volt equipmemt is being connected to B phase.

so i wont have any problem if i have a 208V AC 3-phase equipment on this panel or a 240v 3phase equipment it should work fine ?

If the equipment is rated 208 volt (only) then it is a violation of 110.4 to operate it on a 240 volt system. The higher voltage could cause damage.

 

[RETRAINDAILY]

You have to check your drive parameters you may have to change them depending on manufacture and transformer taps.