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Heat Tracing Questions

Nick Parker
1. Why the heat tracing cables draw more current during starting at start up temperature?

2. How self regulated tracing cables are inherently safe and can be used in hazardous area?

3. How the Maximum circuit length is determined according to the breaker type? What is the equation used here? (see the picture below)
e67a1e17174e1cfe703103d0d31160e2-huge-maximum-circuit-lenght.png
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    "Another advantage of PTC heaters in tape form or otherwise, is that they are not sensitive to voltage variations within reason. At a lower line voltage they will draw more current and maintain the same temperature."

    Surely the current will reduce at lower line voltage as per Ohms Law.
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    "Another advantage of PTC heaters in tape form or otherwise, is that they are not sensitive to voltage variations within reason. At a lower line voltage they will draw more current and maintain the same temperature."

    Surely the current will reduce at lower line voltage as per Ohms Law.
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