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Maximum operation temperatures for Heating Cables


Cable Sheath Temperature °C - Heating Cable 400 Volt

Follow Ratings A, B and C below to obtain sheath temperature guidelines from the graph, for ordinary area applications.

Cable Sheath Temperature °C - Heating Cable 400 Volt

Watts / Metre


Cable reference Rating Factor

Rating A
By design, identify cable reference to be used and calculate watts/metre rating of cable/element e.g. 0,40CN2A40; 80 W/m.

Rating B
Refer to rating factor table and multiply watts/metre rating of cable/element by rating factor to obtain adjusted watts/metre value. (80 W/m x 0.800 = 64.00 W/m)

Rating C
Using adjusted value, enter graph on watts/metre axis and obtain cable sheath temperature for application maintain temperature. Cable sheath temperature = 350°C for 100°C maintain – see graph.

1,6CN2A32 1.000
1,0CN2A34 0.941
0,63CN2A37 0.865
0,40CN2A40 0.800
0,25CN2A44 0.727
0,16CN2A49 0.653
0,063C2A32 1.000
0,040C2A34 0.941
0,025C2A37 0.865
0,017C2A46 0.696
0,011C2A49 0.653
0,007C2A49 0.653
0,007C2A53 0.604
0,004C2A59 0.542


Cable Sheath Temperature °C - Heating Cable 800 Volt

Follow Ratings A, B and C below to obtain sheath temperature guidelines from the graph, for ordinary area applications.

Cable Sheath Temperature °C - Heating Cable 800 Volt

Watts / Metre


Cable reference Rating Factor

Rating A
By design, identify cable reference to be used and calculate watts/metre rating of cable/element e.g. 2,5V2A36; 100 W/m.

Rating B
Refer to rating factor table and multiply watts/metre rating of cable/element by rating factor to obtain adjusted watts/metre value. (100 W/m x 0.889 = 88.9 W/m)

Rating C
Using adjusted value, enter graph on watts/metre axis and obtain cable sheath temperature for application maintain temperature. Cable sheath temperature = 500°C for 300°C maintain – see graph.

10V2A32 1.000
6,3V2A32 1.000
4,0V2A32 1.000
2,5V2A36 0.889
1,6V2A38 0.842
1,0V2A41 0.780
0,63V2A45 0.711
0,40V2A50 0.640
0,25V2A56 0.571
0,16V2A65 0.492
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