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4.3 Grounding and Potential Equalization
The EE300Ex shall be integrated into the potential equalization to avoid hazards from electrostatic
charges. The grounding shall comply with EN60079-14, EN60079-25 or IEC60079-14, IEC60079-25. A
remote probe shall also be grounded using a screw connection with a maximum of 1 MΩ in the potential
equalization.
The ground conductor or the potential equalization connection must have a cross-section of 4 mm²
(0.06 in²) for the external grounding. Stranded wires shall be fitted with suitable wire-end sleeves.
The resistance of the ground connection of the intrinsically safe barrier shall be max. 1 Ohm.
For installation in the U.S. use internal ground connection. The wire cross-sectional must comply with
NEC Section 250.122.
External grounding:
Internal grounding:
User Manual EE300Ex Humidity / Temperature Sensor
Cable cross-section
maximum 4mm² (0.06in²)
Grounding connection channel 1
Grounding connection channel 2
Grounding connection occupied
Cable cross-section
maximum 10 mm²
(0.2 in
)
2
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