basic question
I'm helping out a coworker who is overloaded by doing some research. This is not my area of expertise. We are government and looking to let a contract to (as he quickly explained it) maintain (yearly) our 6 or so UPS systems (from 30 kVA to 120) including providing status on the condition of batteries, ability to provide power for 5 minutes, and provide external maintenance bypasses for each UPS.
He did say that some of the UPS's have internal maintenance bypasses but my understanding is that he wants each one to have an external maintenance bypass (input 480 volts and output 208). My question really is that does make sense - if some already have internal bypasses why would we buy (or what is the advantage of adding) external bypasses for those? Was going to ask him that question but he is out of the office for a few days. Apologize for the ignorance but thought I'd throw this out just to see if anybody could help me get a better understanding.
Thanks!
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