What are the essential steps for installing a SIEMENS ZS-30 Intrinsically Safe Module in a hazardous environment?

[VonElijah]

Installing the SIEMENS ZS-30 Intrinsically Safe Module in a hazardous location requires careful adherence to safety guidelines. Here's a breakdown of the key steps for a compliant installation:

1. Grounding: It is crucial to remove the System 3 chassis ground. Connect each duplicate grounding conductor directly to the grounding connections on the barrier device. Run these conductors directly to the ground electrode, ensuring they do not pass through any other paths. Use ground wires of 14 or 18 AWG, and ensure their impedance does not exceed 1 ohm. All ground wires should connect separately to the same grounding location.

2. Wiring: All wiring connected to the barrier output (terminals 1 and 5) must be grouped exclusively with intrinsically safe circuits. Avoid running these wires in conduits that contain non-intrinsically safe circuits. Use rigid conduit for wiring from the control unit enclosure to the intrinsically safe zone. Seal off the hazardous area using standard EY conduit seals filled with Chico X fiber and Chico A sealing compound.

3. Devices: You can include non-energy storing devices, like manual stations, in the detector loop. Ensure they connect in parallel with the barrier output and do not contain any energy-storing components. These devices must also be Factory Mutual approved. The maximum detector loop resistance should not exceed 50 ohms.

4. Maximum Inductance and Capacitance: Cables and wires connected to the barrier output must adhere to specific maximum inductance and capacitance values, which depend on the group classification (A, B, C, D, E, F, G).

5. Additional Notes: Always ensure the maximum loop resistance does not exceed 50 ohms. The maximum safe system voltage is 250 VAC. Only use mechanical (non-energy storing) shorting devices. Avoid making any connections to terminal 6 of the DI-31S BA SU NNECTION, as this will void the module's suitability for intrinsically safe applications.

Following these guidelines will help ensure a safe and compliant installation of your SIEMENS ZS-30 Intrinsically Safe Module.