Dilemma

[Tesla65]

I have server racks that are supplied by 3 phase PDU,s (basically a sophisticated socket outlet strip) each socket will be connected to a different live phase but the same neutral and earth. iT servers are connected to these outlets. My problem is that i have several single phase retractable trailing leads that are used to connect my crash cart monitors to power, we then connect the monitor to the server via a VGA display cable. I have now been told by H&S that this cannot be so as there is a chance that I could get cross phasing. I do not believe this to be true. But would be grateful for any advice.

regards
tesla65

 

[Sintra]

If I'm reading this correctly then it does sound that you could easily have cross phasing between your monitor and the server.

 

[cossie400]

Are 100% sure you have 3 phase PDU's? Never seen one in any data center I have been in.
Just checking, you're not confusing your distribution system with your rack supply's? Usually you'd have single phase supply's in your rack fed from 3 phase distribution boards, and usually each row of racks would be on the same single phase, with each row of racks spread evenly over the 3 phases!

 

[SparkyJoe]

sometimes they they put backup psu's on a different phase?

But really you would need 2 faults at the same time?

Edit: Its my personal opinion that the H&S exec, should be put up against a wall and bloody shot.

 

[Knobhead]

A reversed polarity on one of the wander leads is the only thing I can think of that would cause problems when connecting the VGA lead. That would need two faults.
They are talking out of their nether regions as per usual.