B-13
z
In the power distribution box (or the first power cabinet of a row in the transmission machine room),
every terminal block on the -48V connector bar has a numeric identification. For example, in the
above label of “A01/B08--48V2”, “08” (or sometimes “8”) is the numeric identification of the terminal
block.
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PGND and BGND are two copper bars, on which the terminal blocks are short-circuited, therefore
which terminal is connected makes no difference. It is only necessary to give the row and column of
the power distribution box, instead of giving the specific serial number of the terminal block on the
copper bar. For example, if the label on the loaded cabinet side is “A01-BGND”, it means that the
power cable is a BGND that connects BGND copper bar in the power distribution box on Row A,
Column 01 in the machine room. Information on the labels for PGND cables should be given in the
similar way.
Labels for AC Power Cables
The labels are affixed to the AC cables that provide power for the cabinets, and the protection grounding
cables, including the POWER, PGND, and BGND cables. The 220V AC cables and related PGND and
BGND cables are covered with insulating sheath, so the labels only need to contain the words of “AC"
and the cabinet number. The labels for AC power cables are affixed to one side of the identification
plates on cable ties.
Meaning of the label
Table B-6 shows the information carried on the labels for the AC power cables.
Table B-6
Information on labels affixed to the AC power cables
Content
Meaning
MN-AC
MN: serial number of the cabinet or the socket where the power is led in
The location of the socket is marked out according to onsite situation. If the
sockets can be identified by row number and column number, they can be
numbered following the same rule for the cabinets. If the sockets cannot be
identified by rows and columns, specify the detailed locations to avoid confusing
with other sockets.
The label only carries location information about the opposite equipment and the power socket, while
information of the local end is not necessary.
Example of the label
Make sure that labels are affixed in correction direction. That is, after the cable ties are bundled onto the
cable, the identification plates with the labels should face up, and the text on the labels in the same
cabinet should be in the same direction, as shown in Figure B-14:
