Final answer:
A single-throw knife switch shall not be installed in a manner that will cause a short circuit. When a short circuit occurs, its resistance may actually be decreased due to the increase in temperature. This can happen if the short creates ionization, which lowers the resistance.
Step-by-step explanation:
A single-throw knife switch shall not be installed in a manner that will cause a short circuit. A short circuit is an undesired low-resistance path across a voltage source. When a short circuit occurs, its resistance may actually be decreased due to the increase in temperature. This can happen if the short creates ionization, which lowers the resistance.
A single-throw knife switch shall not be installed in a manner that will cause a short circuit. When a short circuit occurs, its resistance may actually be decreased due to the increase in temperature. This can happen if the short creates ionization, which lowers the resistance. Since power is equal to voltage squared divided by resistance, the power dissipated in the short increases, which can lead to further problems.