H3C S7500E Series

25
CAUTION:
Make sure that the AC power supply uses a three-wire cable with a protection wire, and the PE wire of the
AC power supply is well
g
rounded at the power distribution room or AC power supply transformer side.
In addition, make sure that the PE connector on the switch is well connected to the PE wire of the AC power
supply.
Figure 19 Ground the switch through the PE wire of the AC power supply
Grounding the switch through the RTN wire of a DC power
supply
If the switch is powered by a –48 VDC power supply and no grounding strip is available at the
installation site, you can ground the switch through the return (RTN) wire of the DC power supply, as
shown in Figure 20.
CAUTION:
Make sure the RTN wire is well grounded from the DC egress of the DC power cabinet.