What two factors most commonly determine limitations at terminations?

The limitations at terminations in electrical installations are primarily determined by temperature rating and ampacity. Temperature rating refers to the maximum temperature that the conductors and terminations can withstand without risking damage or failure. Exceeding this temperature can lead to insulation breakdown, reduced performance, or even fire hazards.

Ampacity, on the other hand, is the maximum amount of current that a conductor can carry before it reaches a temperature that could cause overheating. This is crucial in ensuring that the electrical system operates safely and efficiently, as exceeding ampacity can damage the conductor, its insulation, and connected equipment.

Together, these factors play a pivotal role in ensuring the reliability and safety of electrical terminations, making them foundational components in adhering to electrical codes and safety standards. Understanding these limitations helps electricians and contractors ensure that installations are compliant and function as intended under varying conditions.