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Thanks for your help!

If the AHJ has an issue with me modifying the listed assembly what would be a good option? The customer wants a soft-starter on the existing pump.

I understand what you are saying, what if it is a thermal magnetic type? Trying to cover all bases since I am bidding a project this week with this combination.

Does anyone know if an existing across-the-line motor starter inside a motor control center bucket can be changed to a 'soft-starter' without having any issues with NEC? Only wanting to change the starter, not the breaker, control transformer, etc. thanks

Yes, they are charging...thanks

When the electric service was replaced, a backup generator and automatic transfer switch were also installed for the pump station. It looks like the generator would be constantly running if the incoming power was excessively unbalanced. But I didn't setup the transfer switch either.

I'm still trying to find out if the utility changed-out the metering, I really believe they have something wrong on their side!

The power factor correction capacitors were removed when the VFD's were installed. Thanks..

Each pump will run approx. 3 to 4 hrs a day. The pumps are set-up to only run at 55 Hz to keep the filter tanks from over-flowing. Thanks.

When the drives were installed, at the same time the electric utility upgraded the service from a 480v corner grounded delta to a 277/480v wye. Line and load reactors were installed with the drive also. Thanks for all the help!

Very good point, I'll check the 'power factor' information on the drive(s), I'm sure its there somewhere!

What kind of issues 'could' we have with the VFD's? (Adding the capacitors)

This installation has been in service for a year now, and every month the 'electric bill' indicates a 10% loss, now it has leveled out to around 20%. This is a rural electric utility.

Hello, Recently a pumping station was upgraded and the 'part-wind' starters and power factor correction capacitors for three 60hp 480 pumps were replaced with ABB ACQ580 variable frequency drives. Ever since this upgrade, the power factor has dropped every month, dropping from 90% PF (with the...