156Labels for DC power cablesThe labels are affixed to the DC cables that provide power for the cabinets, and the protection groundingcables, including the –48V, PGND, and BGND cables. The labels for DC power cables are affixed toone side of the identification plates on cable ties.Meaning of the labelTable 71 shows the information carried on the labels for the DC power cables:Table 71 Information on labels affixed to the DC power cablesContent MeaningMN(BC)--48V1MN(BC)--48V2MN(BC)-BGNDMN(BC)-PGNDMN(BC): BC is written right under MN.On the loaded cabinet side, only MN is used to identify the cabinet.On the power cabinet side, MN identifies the row and column number of thepower distribution equipment like the control cabinet and distribution box, BCidentifies the row and column number of the -48V connecter (if there is no rownumber or column number, or the connecter can be identified without them, BCcan be omitted). BGND and PGND have no row and column number foridentification.The label only carries location information about the opposite equipment, the control cabinet or thedistribution box, while information of the local end is not necessary. Table 71 lists the information of two-48V power supplies on the label. The information for other DC voltages (such as 24V, 60V) should begiven in similar methods.Example of the labelMake sure that labels are affixed in correction direction. That is, after the cable ties are bundled onto thecable, the identification plates with the labels should face up, and the text on the labels in the samecabinet should be in the same direction, as shown in Figure 91.Figure 91 Example of the labels on the DC power cableIn Figure 91, (1) indicates the label on the loaded cabinet side, which carries the information about theposition of the cable on the power distribution box. (2) indicates the label on the distribution box side,which carries the information about the position of the cable on the loaded cabinet side.On the loaded cabinet side, the label marked with “A01/B08--48V2” on the cable indicates that thecable is -48V2 DC supply, which is from the 8 th connecter on the second row of -48V bus bar in thecabinet on Row A, and Column 1 in the equipment room.On the distribution box side, the label marked with “B03--48V2” indicates that the cable is -48V2 DCsupply, which is from the loaded cabinet on Row B, Column 03 in the equipment room.
