Which component is not intended to exclude the flammable atmosphere or contain an explosion?

The nonincendive component is designed to operate in hazardous locations without initiating ignition in the surrounding flammable atmosphere under normal operating conditions. It achieves safety by limiting energy and maintaining a temperature that cannot ignite the surrounding materials. However, it does not actively exclude a flammable atmosphere or contain an explosion; rather, it is intended for use in environments where hazardous conditions exist, as long as the equipment is used according to its safety design.

In contrast, the explosion-proof component, sealed component, and explosion-rated component are specifically designed to either prevent flammable materials from entering the component or to contain any potential explosions that might occur, protecting the surrounding flammable atmosphere. Therefore, the intent behind these other components is to either keep hazardous materials out or to protect the environment from the effects of an explosion, which is not the primary function of a nonincendive component.