7/27/2019 1910HO0917.pdf

http://slidepdf.com/reader/full/1910ho0917pdf 1/2

Power System GroundingEvaluation from Square D Services 

Increase Your System’s Reliability and Reduce DowntimeSquare D Services oers ground system testing and analysis both inside

and outside o your acility’s walls. Our engineers will also evaluate the

lightning protection system and the application o surge protection devices.

We provide a baseline o the condition o your grounding and surge protection

systems and recommendations or corrective actions, i needed.

Why is proper grounding important?Lack o proper grounding translates into an increased chance o re, data

and equipment losses, process anomalies, plant shutdowns and workplace

saety hazards to personnel. Facilities that have sensitive electronic equipmen

are particularly vulnerable to disruptions. Failing to have a properly designedand operating grounding system can cause damage to electrical devices

and equipment, resulting in nancial and unctional losses. Components o a

grounding system are subject to corrosion due to electrochemical, electrolytic

or chemical reactions. In act, i the system has been in place long enough,

a ground grid can be completely consumed.

UPGRADE BENEFITS

•VeriescompliancewithNFPA(National

FireProtectionAssociation)standardsfor

the type o acility under investigation

•Enhancesworkersafetywhenthe

recommendations o the study are

implemented

•Meetstherequirementsofunderwriting

agencies and insurance companies

•Improvesreliabilityandreducesdowntime

7/27/2019 1910HO0917.pdf

http://slidepdf.com/reader/full/1910ho0917pdf 2/2

Schneider Electric USA, Inc.

9870 Crescent Park Drive

West Chester, OH 45069

Phone: 513-777-4445

Fax: 513-755-5028

www.schneider-electric.us

This document has been printed on recycled paper 

DocumentNumber1910HO0917 January2010cw

Power System Ground Evaluation

from Square D Services (continued)

Square D Services U.S. NetworkComponents o the Grounding EvaluationOur power system engineers will develop a

customer-specic scope o work to address your

areasofconcern.Afullscopeofworkwilltypically

include the evaluation o:

1. Grounding system and the ground grid at the

main switchyard including the switchgear

room. Grid resistance measurement and

resistance between specic points in the grid

(IEEEstandards80and81).Groundcurrent

fow and potential dierences across the

ground grid.

2. Grounding system at the service entrance

equipment, the generators and generatorpanels and automatic transer switches

(whereused).

3. Grounding electrode system and bonding

methods including the structural metal used in

the grounding system.

4. Ground ault protection equipment.

5.Lightningprotectionsystem(NFPA780)and surge protection application.

6. Sensitive equipment grounding requirements (IEEE1100,TheEmeraldBook).

Our customer-specifc report provides:

1. Risk assessment o potential ground ault

conditions, surge events, voltage rises and

circulating currents along with recommendations

to lower the risk o potential damage.

2. Corrective action recommendations to improve

the existing grounding systems to comply withcurrent electrical codes and standards as well

as best practices applicable to the acility.

 

Why Choose Square D ServicesOur registered proessional engineers, saety trained and equipped, will

design, speciy, install and commission your upgrade project. We have

over100professionalengineersinvariousgeographiclocationswhoare

collectively registered in all the states o the U.S. Recognized as industry

experts in power system analysis, design and codes and standards, manyofourengineersareleadersinIEEE,NFPAandotherpowersystem

standard-making organizations.

For more information, call 1-888-SQUARED or visit

us at www.SquareD-Services.com.

An example of improper grounding is shown above.