An AC general use snap switch used to control a motor load shall not exceed what percentage of the amp being read of the switch's rated voltage?

A general use snap switch controlling a motor load must adhere to specific safety guidelines to prevent overheating and ensure reliability. The correct answer indicates that a motor load must not exceed 80% of the switch's rated voltage for safe operation. This limit is significant because motors typically experience inrush currents that can be several times higher than their normal running current when starting. By setting the threshold at 80%, it allows for a margin of safety, ensuring that the snap switch can handle the temporary high load without overheating or failing.

This percentage is derived from the National Electrical Code (NEC), which promotes safe electrical practices. Hence, using a switch within this rating helps to avoid failure modes that could lead to electrical fires or equipment damage.

In contrast, lower percentages would not provide sufficient capacity to account for motor startup conditions, while a higher threshold could place undue stress on the switch, leading to potential hazards. Therefore, maintaining the operating load at 80% or less of the switch's capacity is standard practice in ensuring safe operation in motor applications.