Nortel Networks 411-2021-111 manual Cable Identification

Power and Grounding Requirements 5-9

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.

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	dc power return,	L-	(typically black with a
the +24 Vdc power	battery return,		tag)
supply)	BR conductor
-48 Vdc /-60 Vdc	dc power	L-	(typically black with a
			tag)
0 V (grounded side of	dc power return,	L+	(typically black with a
the -48/-60 Vdc power	battery return, BR		tag)
supply)	conductor
grounded (or bonded	framework ground,	FG	green (50%) yellow
to ground)	framework bonding		(50%)
	conductor
grounded (or bonded	ac equipment	none	green (N. America)
to ground)	grounding conductor		green + yellow
			(Europe)

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.

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