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Tips for Better Electrical Grounding Cheat Sheet (DRAFT) by [deleted]

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Introd­uction

Proper grounding keeps the gremlins out of automation and controls, when approp­riate instal­lation practices are followed. Here are 10 tips for better grounding.

Proper grounding keeps the gremlins out of automation and controls, when approp­riate instal­lation practices are followed. Here are 10 tips for better grounding, summarized from "­Control System Power and Grounding Better Practi­ce,­" a book published by Control Engine­ering , Elsevi­er/­Newnes, and Reed Business Inform­ation, and written by David Brown, David Harrold, and Roger Hope.

Tips

1) Control system ac power should be supplied from a distri­bution system that’s separate from other equipment and uses.

2) The power source should be designed to accomm­odate initial inrush currents that can last up to 10 cycles.

3) Control system ac power should be supplied through an isolation transf­ormer or uninte­rru­ptible power supply (UPS).

4) Control system ac ground should be establ­ished at or near the isolation transf­ormer or UPS.

5) Control system workst­ation ac power should be routed to a dedicated recept­acle.

6) When connecting field device power to several I/O interface carriers, barrier strips should be used.

7) When ac and dc input are connected to the same terminal block, the block must be marked with approp­riate warning labels.

8) The ac ground wire should be the same or one size larger then the curren­t-c­arrying conduc­tors.

9) Leaving a little extra exposed wire or using a terminal lug are ways to provide test points.

10) Electrical resistance of an earth ground system must be tested to ensure the ground meets control system manufa­cturer requir­ement
 

Electrical Grounding