Non-incendive and non-incendive field wiring apparatus are terms commonly used in hazardous locations to denote equipment and wiring methods that are designed to minimize the risk of igniting flammable gases, vapors, or dusts.

1. Non-Incendive: Non-incendive equipment or wiring is designed in such a way that it does not produce sparks or temperatures high enough to ignite a hazardous atmosphere under normal operating conditions. This type of equipment is typically used in Class I, Division 2 locations where flammable gases or vapors are present, but not likely to be present in ignitable concentrations under normal operating conditions. Non-incendive wiring methods may include using properly rated cables, enclosures, and devices that prevent arcing or sparking.

2. Field Wiring Apparatus: Field wiring apparatus refers to the electrical equipment and components used for wiring connections in hazardous locations. This includes wiring junction boxes, terminal blocks, connectors, cable glands, conduit fittings, and other components that are specifically designed and rated for use in hazardous environments. Field wiring apparatus must be selected and installed in accordance with the requirements of the National Electrical Code (NEC) and any applicable local regulations or standards for hazardous locations.

In hazardous locations, it is crucial to use non-incendive equipment and wiring methods to prevent the risk of ignition and potential catastrophic events. Non-incendive field wiring apparatus ensures that electrical connections are made safely and securely without introducing sources of ignition that could ignite flammable atmospheres. Proper selection, installation, and maintenance of non-incendive equipment and wiring are essential for ensuring the safety of personnel and facilities in hazardous environments.