Feed to customers building - Comed supplied 6 wires tie to 3 wires?

[Air Kev]

Have a customer who is set up for 208v 400a service panel. Having service calls being placed for the AC units shutting off. Getting varying low voltage to the units 191/193/190 on average. Called COMED and was told the wiring and the xformer were bad then now good. Pics show the feed from the pole xformer to the building going from a 3 wire splice to wires paired up making 6 about 300' to the building and back to 3 for the last 100'. Pissed customer and Comed no help. Any thoughts?

New item by Kevin Kelly

photos.app.goo.gl

 

[Air Kev]

At the xformer

New item by Kevin Kelly

photos.app.goo.gl

 

[retirede]

If that’s the no load voltage, transformer taps are set wrong.

 

[Air Kev]

This feeds the 3 wires at the pole on the
customers property. About 1000 feet next door is where the 3 wire feed comes from.

New item by Kevin Kelly

photos.app.goo.gl

 

[don_resqcapt19]

Those voltages are outside the permitted voltages for a 120 volt to ground service per the Illinois Commerce Commission. Those line to line voltages mean that the line to neutral voltages are in the 109-110 volt range.

Illinois Commerce Commission JCAR rules
Section 410.300 Voltage Regulation

a) Standard voltage. Each entity supplying electrical energy for general use shall adopt a standard service voltage of 120 volts (when measured phase to neutral) and shall maintain the service voltage within the allowable variations from that value at all times.

b) Allowable voltage variations. For service rendered at the standard service voltage, voltage variations as measured at any customer's point of delivery shall not exceed a maximum of 127 volts nor fall below a minimum of 113 volts for periods longer than two minutes in each instance. For service rendered at voltages other than the standard voltage value, voltage variations as measured at any customer's point of delivery shall not exceed 10% above or below the service voltage for a longer period than two minutes in each instance.

c) Variations of voltage in excess of those specified above shall not be considered a violation of this Section if caused:

1) by operations of a retail customer in violation of an agreement with or the rules of the entity;

2) by the operation of apparatus on a retail customer's premises that results in large inrush currents;

3) by infrequent and unavoidable fluctuations of short duration due to system operation; or

4) by acts of nature or other situations beyond the entity's control.

 

[Air Kev]

Thanks, getting no where with these guys. Been since early July.

 

[retirede]

Thanks, getting no where with these guys. Been since early July.

And you probably won’t. Ford had to make a software change to their electric vehicles because they wouldn’t charge on on Com-Ed’s out of spec voltage.