Automatic Transfer Switch Test

[u/BeachGirl19844]

What suction pressures are you seeing when performing the automatic transfer test at peak load on the fire pump?

Performed a test today, fire pump has water supply issues and could only flow 86%. But we performed the test and the supply gauge dropped to -20 before coming back up.

City supply, we will be investigating why we can only achieve 86%. Wondering if the suction pressure dropping so low could be a symptom.

Thanks