three phase ?

[mickeyrench]

Can someone tell me about a electric panel i came incontact with , the readings i got were , from L1 - GROUND 0 VOLTS . FROM L2 to GROUND- 480 , FROM L3 to GROUND- 480. and from any two legs you get 480. what type of service is this.

 

[infinity]

Sounds like a 480 volt, 3 phase, 3 wire, corner grounded Delta system.

 

[mickeyrench]

can 3 phase 480 volt motors be used with a corner grounded system?
because on that system one phase is 0 volts and a 3phase has 3 legs with voltage. thanks

 

[jeremysterling]

can 3 phase 480 volt motors be used with a corner grounded system?

Yes, motors are designed to run on this type of voltage (corner grounded delta)

because on that system one phase is 0 volts and a 3phase has 3 legs with voltage. thanks

A Volt meter may tell you there is 0 volts from the grounded conductor to "ground"( an arbitrary reference that the motor never sees). The motor only sees line to line voltage, and if you check, you will likely find:

VL1-L2 = 480V
VL2-L3 = 480V
VL3-L1 = 480V

Therefore all three phases are "hot".

 

[cadpoint]

Here's a link to some various diagrams to ponder. various diagrams

Try the 3 phase A/C, enjoy...

These was found using google, image using: 3 phase 3 wire corner grounded Delta system.