sparky 134
Senior Member
- Location
- Joliet, IL
A customer is having issues with the power arriving at the meter socket from the POCO transformer. At first the voltages were 120, 120, 314 and this is on a 120/240volt 3phase 4wire system. POCO is called back to the site and the crew discovers the transformer is wired incorrectly. After rewiring the voltages were 120, 120, 208. I informed the customer the third phase should be 240volt.
Fast forward a week and I received a call saying the compressor that is fed from this service will not start. The voltages recorded by the service guy are 120, 95, 208. POCO says the problem lies with the customer owned underground cable which was installed +/- 14 years ago.
I'm thinking there is a fault in the cable and the B phase is leaking to ground. Is there a tool I can use to determine the location of the fault ?
The service was existing. The extent of my work is limited to the raceway/wire from the meter socket to the equipment.
Fast forward a week and I received a call saying the compressor that is fed from this service will not start. The voltages recorded by the service guy are 120, 95, 208. POCO says the problem lies with the customer owned underground cable which was installed +/- 14 years ago.
I'm thinking there is a fault in the cable and the B phase is leaking to ground. Is there a tool I can use to determine the location of the fault ?
The service was existing. The extent of my work is limited to the raceway/wire from the meter socket to the equipment.