Grouping Air

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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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