TABLE - 64
( FOR INSTALLATION IN AIR ONLY) GROUP RATING FACTORS FOR GROUPS OF MORE THAN ONE MULTI-CORE CABLE IN AIR - TO BE APPLIED TO THE CURRENT-CARRYING CAPACITY FOR ONE MULTI-CORE CABLE IN FREE AIR Number Number of cables of trays 1 2 3 4 6 9 1 1.00 0.88 0.82 0.79 0.76 0.73 Method of Installation
Touching
2
1.00
0.87
0.80
0.77
0.73
0.68
3
1.00
0.86
0.79
0.76
0.71
0.66
Cables on perforated trays
Spaced
1.00
1
1.00
0.98
0.95
0.91
-
2
1.00
0.99
0.96
0.92
0.87
-
3
1.00
0.98
0.95
0.91
0.85
-
Touching
0.72
1
1.00
0.88
0.82
0.78
0.73
2
1.00
0.88
0.81
0.76
0.71
0.70
Cables on vertical perforated trays
0.91
1
1.00
0.89
0.88
0.87
-
Spaced
2
1.00
0.91
0.88
0.87
0.85
-
0.78
1
1.00
0.87
0.82
0.80
0.79
Touching
2
1.00
0.86
0.80
0.78 0.76
0.73
3
1.00
0.85
0.79
0.76 0.73
0.70
Cables on ladder supports, cleats, etc
1
1.00
1.00
1.00
1.00 1.00
-
Spaced
2
1.00
0.99
0.98
0.97 0.96
-
3
1.00
0.98
0.97
0.96 0.93
-
Note 1: Values are given for vertical spacings between trays of 300 mm and at least 20 mm between trays and wall. For closer spacing, the factors should be reduced.
Note 2: Values are given for horizontal spacing between trays of 225 mm with trays mounted back to back. For closer spacing, the factors should be reduced.
50 MKK XXS002-02/01-12-2014
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