Figuring out System Voltage

[baserunner4]

Hello,

I’m a new student in engineering. We were given different scenarios and asked to figure out the system voltage from real life pictures and voltage/current readings. I’m stuck on one of them. For the voltage readings I got:
A to B: 215.4
A to C: 215.1
B to C: 215.3

A to GND: 124.3
B to GND: 124.6
C to GND: 123.9

Also I realized that there was only 1 transformer can coming in from the pole so I assumed it was a 240V spilt phase system.

This would indicate a 240Y/120V spilt phase system. Just making sure I have enough evidence to prove my answer. Would there be anything else I would have to consider?

 

[chris kennedy]

Looks like 208y/120

 

[infinity]

Looks like 208y/120

I agree the ratio is the same:

215.4/124.3=1.73
208/120=1.73

 

[chris kennedy]

Like no load on the tranny.

 

[kwired]

I agree the ratio is the same:

215.4/124.3=1.73
208/120=1.73

I agree also. Typical 208 volt system around these parts does tend to measure about 215, unloaded anyway, and line to neutral accordingly.

 

[Ingenieur]

you know the nominal utilization v is 120

120/124.3 (avg of the 3) x 215.3 (avg of the 3) =207.9

208/120 is a standard nominal system voltage

 

[electrofelon]

I agree also. Typical 208 volt system around these parts does tend to measure about 215, unloaded anyway, and line to neutral accordingly.

I concur. 215 is very typical for a 208 nominal system around here. Utilities generally keep their voltage on the "healthy" side.