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How many ohms required for proper instrument earthing ?

Electrical Calibration Instrument Control Instrument Development Instrument Design
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Question ajoutée par Faseem Abdulla Kattil Veedu , Lead Instrumentation Engineer/Procurement Engineer , Sinopec Branch Of International Petroleum Coorporation
Date de publication: 2016/03/02
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Faseem Abdulla Kattil Veedu
par Faseem Abdulla Kattil Veedu , Lead Instrumentation Engineer/Procurement Engineer , Sinopec Branch Of International Petroleum Coorporation

5 ohms or less some instruments like loadcell required 1 ohm or less

Muhammad Saad Zafar
par Muhammad Saad Zafar , Project Controller - Substations & Industrial Projects , Al Kawaser United Company for Trading & Contracting

As per IEEE, NEC and NFPA standards, the grounding resistance for sensitive equipment should be 5 ohms or less. 

Hasan Zainy
par Hasan Zainy , Control / Instrumentation Filed Service Engineer , GE

there are a lot of details for this subject of path for grounding: the type of instrument , location and the zone where the instrument is located

 

as perANSI/ISA-RP12.06.01-2003 Formerly ANSI/ISA-RP12.06.01-1995 (R2002) Recommended Practice for Wiring Methods for Hazardous (Classified) Locations Instrumentation Part 1: Intrinsic Safety

 

"All grounding path connections should be secure, permanent, visible, and accessible. The groundingpath resistance from the farthest barrier to the grounding electrode should not exceed 1 ohm.  "

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