I inspected a UPS installation yesterday we and filled up 2 sheets of violations. One of which had to do with the conduit; the electrician had installed the UPS rectifier input, bypass input and output cabling in a single 4" piece of rigid conduit. They had also run the UPS alarm cabling through the same conduit. My colleage and I are both certain it's illegal, but couldn't recall exactly WHY- the two inputs (rectifier and bypass) are fed from different transformers, but coming from a common bus. Is it legal to put both of those in a single raceway? Is it legal to put the UPS output cabling in the same raceway as that?
And finally, the data cable they used has no markings on it to indicate voltage rating or that it's class 2 so it's illegal in this case- if it WAS 600V class 2, would it be legal to run it in the same conduit? It's not controlling the UPS, but is taking alarm signals from the UPS ("on bypass") to the wraparound maintenance bypass switch.
