H3C MSR Series, Руководство по устранению неисправностей, Страница: 16 / 28

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Figure 3 Grounding when grounding strips are provided
When the device is installed in a 19-inch cabinet, you can connect the yellow-green grounding cable
to the grounding terminal of the cabinet, and make sure the grounding terminal of the 19-inch cabinet
is well connected to the grounding strips of the equipment room.
Grounding strips are not provided and the grounding conductor cannot be buried in the earth in the
installation environment
When grounding strips are not provided and the grounding conductor cannot be buried in the earth
the installation environment, follow these guidelines.
•
When the device uses a 220V AC power supply, you can use the PE wire of the AC power
supply for grounding, as shown in
Figure 4 . Make sure the PE wire of the AC power supply is
well grounded in the electric distribution room or the AC power transformer. Additionally, make
sure the PE terminal of the device is well connected to the PE wire of the AC power supply. The
power cable of the device must be a three-core cable with a grounding cable. If the PE wire of
the AC power supply is not grounded in the electric distribution room or the AC power
transformer, submit the rectification requirements to the customer as soon as possible.
Figure 4 Grounding using the PE wire of the AC power supply
•
When the device uses a -48V (or +24V) DC power supply, you can use the RTN or PGND cable
of the DC power supply for grounding, as shown in
Figure 5 . Make sure the RTN or PGND wire