Dell Force10 S50N Series Installing Manual page 28

front left of the switch (see
You must provide your own cables to connect to the power source. Cables must be sized for 11.5 A
service at no more than -48VDC input (per NEC in the United States; internationally, follow local safety
codes.). Before you make the cable connections, apply a coat of antioxidant paste to unplated metal
contact surfaces. File unplated connectors, braided straps, and bus bars to a shiny finish.
Make sure that the remote power source (the circuit breaker panel) is in the OFF position.
1
Remove the safety cover from the DC terminal block.
2
Connect the grounding cable to the FG terminal first, then connect the opposite end to the
3
appropriate grounding point at your site to ensure an adequate chassis ground.
Connect the -48 V and -48 V RTN (Return) cables to the switch terminals and then to the remote
4
power sources, ideally on separate circuit breakers.
Replace the safety covers on the DC terminal blocks.
5
If you are connecting both terminal blocks, do not supply power until both terminal blocks are
6
connected. You can supply power to either one or both. The S50N-DC does not set a precedence for
either power source.
28 | Installing the Switch
Figure 2-2 on page 9); the left block is matched to the DC2 status LED.