Instruments in Zone 1: Hot Work Permit Required, Device Coupler in Zone 2

1. Trunk: protected installation according to IEC 60079-14
2. Spurs: protected installation according to IEC 60079-14
3. Instruments: flameproof Ex d, protected installation
    

Where classifications for both—Zone 2 and Zone 1—exist, this installation method is suitable. The entire installation requires a means of mechanical protection: “increased safety” Ex ec and Ex eb. The Segment Protector always resides in Zone 2.