On Mon, Mar 31, 2008 at 01:39:31PM +0200, William Jackson wrote: > The 6000W-DC power supply takes four pairs of 4AWG PWR cables, my > question is the following. > > Which way is this setup cabled? > > 1. all 4 pairs of cables going back to a single circuit breaker of > ( 6000/48 = 125Amp ) > 2. each pair of cables going back to a separate circuit breaker of > ( 6000/4 = 1500/48 = 31.25 Amp )
Each pair would go back to a seperate breaker. If you are expecting a max draw of 31.25A, you'll need a 40A breaker on each. You'd be able to get away with 5AWG, but 4AWG is probably more commonly found. Typically, you are feeding the rack with an A and B power feed anyway, but in this case, the tech note in the installation manual says you need to feed all 4 pairs for each from the same feed, so one PEM from A feed, and the other PEM from the B feed. I guess Cisco just didn't feel like requiring 00AWG cable from its customers or whatever is needed to handle it in one shot for this beast. _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
