I am inspecting a 480VAC pump station that appears to be at the end of the utility feed. The system voltage measured (unloaded) is 500VAC. When I run a single 250HP pump, the voltage sags to 480VAC. When multiple pumps are running it sags to as low as 455VAC. This is causing a problem with the solid state drives. The pumps are having a problem reaching full speed with this voltage sag. I need to find some standards to compare these findings with.
Does the NEC address power quality?
The 120VAC power derived from this source varies from 123VAC to 116VAC. Are there any standards for how much this voltage may vary?
Does the NEC address power quality?
The 120VAC power derived from this source varies from 123VAC to 116VAC. Are there any standards for how much this voltage may vary?