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Power and Grounding Requirements
5-9
DMS-MTX DualMode Metrocell Cell Site Description
Cable Identification
It is a current practice to label or color-code insulated conductors. The
following table shows the labeling and colors of insulated wires used in North
America.
Framework Ground or Framework Bonding conductors are also known as
"Protective Earth" as per IEC-950. The 50/50 green yellow ratio must be no
less than 30% and no more than 70% for either color.
Note:
Countries outside North America may have different labeling and
color coding of cables. Follow the safety standards for installation and
maintenance of electrical equipment in your country accordingly.
Table 5-2
Cable identification - North America
Conductor Potential Function Label Color Code (if used)
+24 Vdc dc power L+ (typically black with a
tag)
0 V (grounded side of
the +24 Vdc power
supply)
dc power return,
battery return,
BR conductor
L- (typically black with a
tag)
-48 Vdc /-60 Vdc dc power L- (typically black with a
tag)
0 V (grounded side of
the -48/-60 Vdc power
supply)
dc power return,
battery return, BR
conductor
L+ (typically black with a
tag)
grounded (or bonded
to ground)
framework ground,
framework bonding
conductor
FG green (50%) yellow
(50%)
grounded (or bonded
to ground)
ac equipment
grounding conductor
none green (N. America)
green + yellow
(Europe)