Medium Voltage Power Cables Catalogue - AEC Online

Annex E: Derating Factors
Cables on vertical perforated trays (touching)
Laying form
Clearance betw. trays ≥ 225 mm
Number of trays
Number of cables (three-phase circuits)
1 2 3 4 6 9
225 mm
1
1.00
0.88
0.82
0.78
0.73
0.72
2
1.00
0.88
0.81
0.76
0.71
0.70
3
-
-
-
-
-
-
Cables on vertical perforated trays (spaced)
Laying form
Clearance = cable diameter (D e )
Clearance betw. trays ≥ 225 mm
Number of cables (three-phase circuits)
Number of trays
1
1 2 3 4 6 9
1.00 0.91 0.89 0.88 0.87 -
225 mm
2
1.00
0.91
0.88
0.87
0.85
-
D e
3
-
-
-
-
-
-
Cables on ladder supported, cleats, etc. (touching)
Clearance from the wall ≥ 20 mm
Number of trays
Number of cables (three-phase circuits)
1 2 3 4 6 9
Laying form
1
1.00
0.87
0.82
0.80
0.79
0.78
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
20 mm
Cables on ladder supported, cleats, etc. (spaced)
Clearance = cable diameter (D e )
Clearance from the wall ≥ 20 mm
Number of trays
Number of cables (three-phase circuits)
1 2 3 4 6 9
Laying form
1
2
1.00
1.00
1.00
0.99
1.00
0.98
1.00
0.97
1.00
0.96
-
-
-
D e
3
1.00
0.98
0.97
0.96
0.93
20 mm
151