A multipole, general-use snap switch should not be fed from more than how many circuits unless marked as a multi-circuit switch?

A multipole, general-use snap switch is designed to control multiple circuits simultaneously but typically is not intended to handle more than a single circuit unless it is explicitly marked for multi-circuit use. The rationale behind this is primarily grounded in safety and electrical code practices. Using a switch designed for a single circuit to control multiple circuits without proper marking can lead to overloads, increased risk of fire, and potential circuit failures due to improper handling of the electrical load.

If a switch is marked as a multi-circuit switch, it means the manufacturer has designed and tested it to safely manage the voltage and load requirements of more than one circuit. The absence of such a marking indicates that the switch's performance and safety have only been validated for single circuit use. Thus, the correct answer is that a multipole general use snap switch should not be fed from more than a single circuit unless marked otherwise.