7 Routing Cables
RTN(black)
•
Shut off the DC input, and attach labels on the switches that will be set during the cabling work.
•
Insulate the DC terminals and all unnecessary bare parts.
• Connect the PGND cable properly to ensure that the service subrack is protected from the
lightning and other interferences.
• Before routing the power cable, turn off the output switch of the DC power system.
7.3 Routing the PGND Cable and the Power Cables
Connect the PGND cable
Connect the power cables
NEG(blue)
RTN(black)
NEG (blue)
PGND cable
Power cable
To the DC PDU / AC ETP4890 LOAD3&LOAD4 ports
Phillips screwdriver
If the subrack is installed in a Huawei cabinet, it does not need to be separately grounded
because the Huawei cabinet has been ground through mounting ears. However, it needs to
be separately grounded if being installed in a third-party cabinet or rack that cannot be
grounded through mounting ears. The ground point can be either of the following points.
• The two power inputs need to be controlled by
independent circuit breakers when being connected to
the DC PDU.
• The PDU requires two -48 V/-60 V power inputs and the
rated current of one break circuit is at least 40 A.
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