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.

10/07/2004


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. Dave Harrold says:

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 requirements.

Click here for ordering information and for special discounts for Control Engineering Online readers

—Mark T. Hoske, editor-in-chief, Control Engineering, MHoske@cfemedia.com





No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
This eGuide illustrates solutions, applications and benefits of machine vision systems.
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
Sensor-to-cloud interoperability; PID and digital control efficiency; Alarm management system design; Automotive industry advances
Make Big Data and Industrial Internet of Things work for you, 2017 Engineers' Choice Finalists, Avoid control design pitfalls, Managing IIoT processes
Engineering Leaders Under 40; System integration improving packaging operation; Process sensing; PID velocity; Cybersecurity and functional safety
This article collection contains several articles on the Industrial Internet of Things (IIoT) and how it is transforming manufacturing.

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

SCADA at the junction, Managing risk through maintenance, Moving at the speed of data
Flexible offshore fire protection; Big Data's impact on operations; Bridging the skills gap; Identifying security risks
The digital oilfield: Utilizing Big Data can yield big savings; Virtualization a real solution; Tracking SIS performance
click me