Grounding The Switch Through The Pe Wire Of An Ac Power Supply; Grounding The Switch Through The Rtn Wire Of A Dc Power Supply - HP 7500 Series Installation Manual

Grounding the switch through the PE wire of an AC power
supply
If the installation site has no available grounding strips, you ground an AC-powered switch through the
PE wire of the AC power supply.
CAUTION:
Make sure the AC power supply uses a three-wire cable with a protection wire, and the PE wire of the AC
power supply is well grounded at the power distribution room or AC power supply transformer side. In
addition, make sure the PE connector on the switch is well connected to the PE wire of the AC power
supply.
Figure 15 Grounding through an AC power PE wire
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
CAUTION:
Make sure the RTN wire is well grounded from the DC egress of the DC power cabinet.
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