Grouping Air

Grouping in Air

Arrangement (installation method)	Number of multi-core cables or single-core circuits
	1	2	3	4	5	6	7	8	9	12	16	20
Bunched in air, on a surface, embedded or enclosed (A-F)	1.00	0.80	0.70	0.65	0.60	0.57	0.54	0.52	0.50	0.45	0.41	0.38
Single layer on floor or wall (C)	1.00	0.85	0.79	0.75	0.73	0.72	0.72	0.71	0.70	0.70	0.70	0.70
Single layer multicore on a perforated horizontal or vertical cable tray system (E-F)	1.00	0.88	0.82	0.77	0.75	0.73	0.73	0.72	0.72	0.72	0.72	0.72
Single layer multicore on a cable ladder system or cleats etc. (E-F)	1.00	0.87	0.82	0.80	0.80	0.79	0.79	0.78	0.78	0.78	0.78	0.78

Grouping in Ground

For cables laid in ducts:

Number of cbles or circuits	Multi-core cables				Single-core cables
	Clearance between ducts				Clearance between ducts
	Touching	0.25 m	0.5 m	1 m	Touching	0.25 m	0.5 m	1 m
2	0.85	0.90	0.95	0.95	0.80	0.90	0.90	0.95
3	0.75	0.85	0.90	0.95	0.70	0.80	0.85	0.90
4	0.70	0.80	0.85	0.90	0.65	0.75	0.80	0.90
5	0.65	0.80	0.85	0.90	0.60	0.70	0.80	0.90
6	0.60	0.80	0.80	0.90	0.60	0.70	0.80	0.90

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