Instruments in Divison 2: Live Maintenance on Spurs, Non-Incendive Field Wiring

1. Trunk: Division 2 wiring methods as defined in NEC501, which relates to mechanical protections
2. Spurs: wiring in accordance withNEC501.10(3), which relates to standard wiring practices
3. Instruments: manufacturer control drawing defines the installation
    

This application is a typical installation for fieldbus in Division 2. It is suitable for live maintenance of spur connections and instruments utilizing the non-incendive Entity concept as defined by the NEC500. Devices may be intrinsically safe devices or non-incendive field wiring devices with published Entity parameters. The fieldbus junction box is the associated non-incendive field wiring apparatus.