230v vs 240v pump voltage

[JasonBoyd]

We're based out of Florida and have always used Flygt or EMU pumps in our lift station designs. They are all 230v and this has never been an issue until recently. Now a local municipality is telling us they require 240v pumps and will not accept 230v pumps.

Electrical engineering is not my forte but it has always been my understanding that 230v and 240v may as well be equivalent. I have been told that the supplied voltage can fluctuate as much as 5% and that the pumps can handle the rated voltage +/- 10% so a 230v pump should have no problems with a 240v supply.

The lady I spoke with at the municipality is new and it seems to me like she is not applying any common sense to local code which does specify 240v. Am I way off base in thinking that this is ridiculous? Can anybody shed some light on this subject for me. Also, in case I'm wrong or they don't care can anybody recommend some pump manufacturers that make 240v pumps.

 

[dpc]

Check NEMA MG-1. The appropriate nameplate voltage for a motor applied on a nominal 240 V system is 230 V. This is to account for the voltage drop between the source bus and the motor terminals.

For 480 V systems, the motors are rated at 460 V.

This person does not know what she is talking about.

 

[JasonBoyd]

Thanks for your help. After speaking with her again she has dropped the issue.

 

[stevenal]

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