
To determine the correct heating cable:
- Calculate the required thermal power P0
- Evaluate cable resistance by formula (1)
- By the length L of the cable, it’s easy to select (2) the cable specific resistance
- Choose the heating cable with specific resistance just lower than selected one
- Calculate thermal stress of cable outer sheath by formula (3)
- If the sheath temperature exceeds maximum permissible temperature (see chart below), re-calculate specific resistance modifying cable length L (longer), cable diameter (larger) or supply voltage (lower)
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