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Eagle Research Corporation

REV 11.1.11 Page | 26

GROUNDING

Because of the potential for equipment damage and injury to personnel, certain

practices should, and often must, be observed when installing RTU systems. Of these

practices, proper grounding is possibly the single most important. This section was

included to point out general rules and practices, and

NOT

to supersede those defined

in the National Electrical Code (NEC) published by the National Fire Protection

Association (NFPA), nor the Classification of Gas Utility Areas for Electrical

Installations booklet published by the American Gas Association (AGA). A sound

understanding of Federal, State, and Local laws is fundamental to proper and legal

installation work. Eagle Research Corporation makes no warranties or guarantees on

the effectiveness or safety of any technique or suggestion here described.

All RTU, electronic utility interface, and gas meter equipment should be kept at the

same ground potential so that unexpected voltages anywhere on the system are quickly

shunted away to earth. This calls for a common ground rod (or "bed" of grounding

materials) to which is securely tied all equipment chassis, metal cabinets, and intrinsic

safety ground brackets. For equipment chassis and metal cabinets, a solid copper

ground wire or ground strapping of an approved size and type is recommended to tie

this equipment to the rod(s). For Intrinsic Safety systems, it is recommended that two

#12 AWG wires be run in parallel from individual ground terminals on each I.S. ground

frame. Where more than one rod is used, as when equipment is separated by some

distance, all rods should be bonded together with copper in an approved manner.

REFERENCES

* National Electrical Code

Article 250 - Grounding

Articles 500 & 501 - Hazardous (Classified) Locations

Article 504 - Intrinsically Safe Systems

* The IAEI Soares' Book on Grounding

* PolyPhaser Corp.'98 catalog of Lightning/EMP & Grounding Solution

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