Under what circumstances can nonincendive field wiring be used?

Nonincendive field wiring is specifically designed for use in hazardous locations where volatile substances may be present. It allows for the connection of devices in a manner that prevents arcing or sparking that could ignite flammable gases or vapors under normal operational conditions.

The correct circumstances for using nonincendive field wiring pertain to its ability to ensure safe operation even under abnormal conditions, provided that it does not ignite any hazardous mixtures that may coexist in the environment. This means that as long as the systems are designed to prevent any ignition sources during possible fault conditions, nonincendive wiring can be implemented safely.

In contrast, other scenarios like general equipment being turned off or the occurrence of arcing do not align with the intended safety applications of nonincendive wiring. Special training, while important for understanding safety protocols, does not specifically dictate when nonincendive wiring is applicable. The focus of nonincendive design is the operational safety it provides, especially addressing abnormal conditions without causing ignition.