H3C Technologies H3C MSR 20-2X[40] - Manual (Page 25)

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Figure 11 Grounding terminal of the router
Use a PGND wire to connect the screw to the earth ground, and the grounding resistance should not be
greater than 5-ohm. Likewise, if the router is installed in a 19-inch standard rack, this rack is required to
be grounded too.
WARNING!
When the router is in normal operation, it is required to be well grounded. Otherwise, the router cannot
reliably avoid lightning, which may damage the router itself and even the peer device.
Connecting the Power Cord
The MSR 20-20/20-21/20-40 router is available with AC-powered units.
Power Input and PGND
Table 13 Power input and PGND of the MSR 20-20/20-21/20-40 router
Item Description
Power input 100 VAC to 240 VAC power input socket
PGND Connected to the earth ground with ground cable
Connecting the AC-input Power Cord
AC power supply
Rated voltage range: 100 VAC to 240 VAC, 50 Hz/60 Hz
The following figure illustrates the partial external appearance of the power socket for an AC-powered
router: