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Medium Voltage Cables/Group Rating Factors/Group Rating Factors single core cables

Group Rating Factors single core cables

Group rating factors for circuits of three single core cables in Trefoil and laid flat touching, horizontal formation (average value)

	Number Of Circuits
		Spacing of Circuits
		Touching
		Trefoil	Laid flat	0.15m*	0.30m	0.45m	0.60m
	2	0.78	0.81	0.81	0.85	0.88	0.90
	3	0.66	0.68	0.71	0.76	0.80	0.83
12/20kV	4	0.59	0.62	0.65	0.72	0.76	0.80
	5	0.55	0.58	0.61	0.68	0.73	0.77
	6	0.52	0.55	0.58	0.66	0.72	0.76

	2	0.79	0.81	0.81	0.85	0.88	0.90
18/30kV	3	0.67	0.70	0.71	0.76	0.80	0.83
	4	0.62	0.65	0.65	0.72	0.76	0.80
	5	0.57	0.60	0.60	0.68	0.73	0.77
	6	0.54	0.57	0.57	0.66	0.72	0.76

*This configuration, at 0.15m spacing, may not be practical for the larger size cables

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