3Com 5500-EI Getting Started Guide - Page 40
Connecting the Earthing Cable,
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40 CHAPTER 2: INSTALLING THE SWITCH Figure 17 RPS Connection to the Switch + - NULL ~100-240V;50/60Hz;1.0A -48 -60V;2.0A NULL -48 -60V;2 0A Null Pinout - + Cable Tie When the RPS is connected to the switch, you can move the circuit breaker in the RPS to the closed (on) position and the switch will be powered by the -48V DC power. The -48V DC power takes priority over the AC mains and powers the switch if it is connected. Connecting the Use the earthing cable that accompanies your switch if the length is Earthing Cable suitable. Alternatively use the earthing cable specification as defined in Appendix C on page 127. The earthing cable is only required if the switch is powered by the RPS only. The recommended cable length should not exceed three metres (9.84 feet).