What should nonmetallic boxes be suitable for concerning the lowest conductor?

Nonmetallic boxes should be suitable for the temperature rating in relation to the lowest conductor. This is important because conductors are rated for specific temperature limits based on their insulation type and the current they carry. The nonmetallic box must be able to withstand the heat generated by the conductors within without degrading or compromising the safety and performance of the electrical system.

Considering the functionality of nonmetallic boxes, it is vital that they match or exceed the temperature ratings of the conductors they contain. If a nonmetallic box is used in a situation where the temperature rating of its materials is lower than that of the conductors, it can lead to failure, which may result in hazardous conditions such as insulation damage, electrical shorts, or even fires. Proper selection ensures that the box can handle the thermal load produced by the conductors safely over time.