28 | Installing the Switch
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front left of the switch (see
Figure 2-2 on page 9
); the left block is matched to the DC2 status LED.
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.
1 Make sure that the remote power source (the circuit breaker panel) is in the OFF position.
2 Remove the safety cover from the DC terminal block.
3 Connect the grounding cable to the FG terminal first, then connect the opposite end to the
appropriate grounding point at your site to ensure an adequate chassis ground.
4 Connect the -48 V and -48 V RTN (Return) cables to the switch terminals and then to the remote
power sources, ideally on separate circuit breakers.
5 Replace the safety covers on the DC terminal blocks.
6 If you are connecting both terminal blocks, do not supply power until both terminal blocks are
connected. You can supply power to either one or both. The S50N-DC does not set a precedence for
either power source.
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