Question

A person is connecting heat trace cable on pipe at the jobsite. The cable he or she is using is rated 2.5 watts/foot. How many feet of this cable can be installed on a 120-volt/15-amp circuit?

Answer 1

The length of the cable will be 6 feet which can be installed  120-volt/15-amp circuit.

What is an ampere circuit?

Ampere's circuital law states that “the line integral of the magnetic field surrounding closed-loop equals to the number of times the algebraic sum of currents passing through the loop.”

Here we have a cable rating of 120-volt/15-amp so if the 1-ampere circuit means 1 watt per foot cable will be used for the 1-ampere circuit.

A Total of the 15-ampere circuit means 15 watts needed so we are using 2.5 watts per foot.

$\rm Length \ of\ Cable =\dfrac{15}{2.5}=6 \ \ foot$

Hence the length of the cable will be 6 feet which can be installed  120-volt/15-amp circuit.

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