1910ho0917.pdf
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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
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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.