Peak Cables - CURRENT RATINGS FOR NICKEL PLATED COPPER WIRES
Unit 5, Gisborne Close, Ireland Business Park, Staveley, Chesterfield, S43 3JT
Tel: 01246 470737  Fax: 01246 280613

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CURRENT RATINGS FOR NICKEL PLATED COPPER WIRES

 

Nominal
conductor
area
mm²
Conductor
Resistance
At 20°C
Ohms per km
Maximum current rating
For one cable in free air
(ambient temperature up to 80°C)
amp
1.0 20.0 25
1.5 13.7 40
2.5 8.21 54
4.0 5.09 74
6.0 3.39 98
10.0 1.95 135

 

RATING FACTORS

For higher ambient temperature the following factors must be applied:

Ambient
Temperature °C
100 120 140 160 180 200 220 240
Factor 0.94 0.87 0.80 0.73 0.64 0.54 0.42 0.24

 

When cables are enclosed a further de-rating of 0.8 must be applied.  When cables are grouped together and touching, the following factors apply:

No. of cables
in group
2 3 4 5 10 15 20 24
Factor 0.8 0.7 0.65 0.6 0.45 0.4 0.36 0.33