Can't you just insist that you be afforded the opportunity to tone out the affected cables, disconnect them and not run the risk?
Yes you do run a risk of damaging things if the existing switch (hub) is equipped for POE.
Rest assured that if you don't, when the IT guy's car won't start a month from now, it will be your fault.
Now this is OT:
My friend who owns a gas station.
Did a state inspection on a vehicle (passed),they came back a week later claiming their rear power window was damaged (not working)due to something they did during the inspection. (people are 'funny')
Back on topic: Trust no one. It will most assuredly take longer to be careful, then to just have them (IT) give the green light. Let them know of the potential,they will respond.
