Projects with Heating Cables

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)