Electrical Earthing and bonding system

2/2/2011

McML

Earthing & Bonding System

McML

Agenda A Warm Welcome to All Delegates

A Technical Presentation on

Earthing & Bonding System By

Mr T N Rao McML Protection Technologies Technologies Pvt Ltd Hyderabad

•

Intr In trod oduc ucti tion on

•

Code Co des s & St Stan anda dard rds s

•

Desi De sign gn Prin Princi cipl ples es

•

Soil Resist Resistivit ivity y , Measurem Measurement ent of soil resisti resistivity vity

• •

Treatment Trea tment of soil , Earth Earth Enhancing Enhancing Compound Compound ,

•

Deep Eart Earth h or Mult Multiple iple earth pits

•

Permanent Perma nent Conne Connections ctions – Exot Exothermi hermic c welding welding

•

Common Com mon Bon Bondin ding g Networ Network k (CBN) (CBN)

•

Case Cas e stu studie dies s – RDS RDSO O Spe Specif cifica icatio tion n

•

Pr ac ac titi ca ca l – Measurem Measurement ent of soil resistivity resistivity – Measurem Measurement ent of earth resistance resistance

1


McML

McML Protection Technologies Pvt Ltd

3


2‐Feb‐11

McML

Why failures are more now ?

A Technical Presentation on


• Modern Modern electro electronic nic equipm equipment ent is sensitive. • More More suscept susceptibl ible e to surges surges and and electromagnetic interferences. • Com Compone ponents nts size size is is reduce reduced. d.

®

• M or or e c om om o ne ne nt nt s e r c hi hi . Technologies Pvt Ltd McML Protection Technologies

• Poor Insul Insulati ation on resista resistance nce..

Plot No 42 , Vijaypuri Vijaypuri Colony Sainikpuri, HyderabadHyderabad- 62

• Mor More e number number of of applia appliance nces s

Mobile : +91-9704456808 Fax : +91-40-4012 0478 Email : [email protected] Web : www.mcmlptl.com

McML Protection Technologies Technologies Pvt Ltd

An eff effect ectiv ive e lo low w im impe peda danc nce e ear earthi thing ng is mand ma ndato atory ry fo forr an any y pr prote otecti ctive ve de devi vice ce to operat ope rate e and pro protectthe tectthe equ equipm ipment ent


44

2‐Feb‐11

1

2/2/2011


McML


McML

Design of Earthing System :

Introduction • Earthing is an integral part of of any any modern Electrical & Electronic equipment protection system design.

1. Ty Type pe of of Earthing Earthing 2. Elec Electro trode de Material

•

An effective, effective, low‐impedance ground system is a key element of power quality assurance.

•

It is crucial not only to ensure personnel safety but, to provide re a e pr pro o ec on or v a equ pmen :

4. Elec Electro trode de Types

• Reducing ambient noise levels

5. So Soil il Resistivity

• Improved system performance

6. So Soil il Treatment

•

To increase equipment life

•

To minimize interruptions of of service service and costly downtime.


3. Elec Electro trodes des Shape

7. Mult Multipl iple e Pits or Deep Electrode

5


2‐Feb‐11 2 ‐Feb‐11

McML

8. Bon Bondin ding g – Permanent Connections


7


2 Feb 11

‐ 2011 ‐ 2 February

McML

Codes & Standards: Classification of Earthing / Grounding

•

IS 3043 3043:198 :1987 7

- Cod Code e of Pra Practi ctice ce for Ear Earthin thing g

•

IEEE IEE E Stan Standar dard d 80

- IEE IEEE E Gui Guide de for Saf Safety ety in AC Subs Substat tation ion Gro Groundi unding ng

•

IEEE Standa Standard rd 1100 - IEEE IEEE Rec Recomme ommende nded d Pra Practi ctice ce for Pow Poweri ering ng and Gro Groundi unding ng Electronic Elect ronic Equipme Equipment nt ( IEE IEEE E Eme Emeral rald d book book))

•

IEEE IEE E Stan Standar dard d 142

•

•

Safety or Protective Earth - For safety of personnel Main Earth, General Electrical Earth, Equipment Grounding, Body Earthing

- IEE IEEE E Rec Recomme ommendedPract ndedPractice ice for Gro Groundi unding n g of Industrial Indust rial and Commer CommercialApplication cialApplications s( IE IEEE EE Gr Gree een n bo book ok))

Associated with Non current carrying body/ body/ conductor

Resist Res istanceand anceand Pot Potent ential ial Gra Gradie dients nts in the Ear Earth th

•

System or Technical Earth -

For stable earth reference or noise

suppression

•

IEEE Standard 837

- IEEE Standard for Qualifying Permanent Connections Used in Substation Grounding

•

IEC 60364-5-2002

- Electrical installations of buildings

Functional, Clean Earth

•

ANSI AN SI UL467

- Gro Groundi unding n g and Bon BondingEquipm dingEquipment ent

Associated with current carrying current conductor

•

BS 743 7430: 0: 199 1998 8

- Cod Code e of Pra Practi ctice ce for Ear Earthi thing ng

•

BS EN 5016 50164-7: 4-7:2008 2008 - Req Requir uiremen ements ts for Ear Earthi thing ng Enh Enhanci ancing n g Com Compoun pounds ds


6

2‐Feb‐11

DC Earth, System Neutral, Telecom Earth, Instrumentation Earth


88

2‐Feb‐11

2

2/2/2011


McML


McML

Technical Reports : Review Electrode Material

National Electrical Grounding Research Project – Pawnee Site Excavation

1. Protection against Corrosion

Corrosion Resistance of different metals • Copper ( 0.2 % ) • Cast Iron / MS (2.2 %) 2.

Protective Coating Copper bonded electrodes ‐ 0.2 % per year ( Recommended min 250 microns) • Hot dip Galvanization (GI ) ‐ 0.5% per year •

3.

High tensile low carbon steel • Material grade BS 4360 grade 43A • Tensile strength of min 600 N/mm2


9


¾” x 10’ galvanized rod removed after 10 years (Pawnee Site). ‐ 2011 ‐ 2 February


McML


2 Feb 11

Technical Reports : Review

5/8” x 8’ Copper Bonded ground rod removed after 10 years (Pawnee Site).

2 February

11 11

McML

Technical Reports : Review

1. Underground Corrosion” –National Bureau of Standards Circular 579 From 1 91 0 t o 1 95 5, the National Bureau of Standards conducted an extensive underground corrosion study in which 36,500 specimens, representing 333 varieties of ferrous, nonferrous, and protective coating materials were exposed in 128 test locations throughout the United States.

National Electrical Grounding Research Project – Pawnee Site Excavation

2. Field Testing of Electrical Grounding Rods” – Naval Civil Engineering Laboratory (NCEL) In cooperationwith theNational Association of CorrosionEngineers, theNCEL conducteda 7-year program of testing metal rods for electricalgrounding. Copperbonded, stainless clad, an ga van ze s e e ro s were nc u e among o er ma e r a s. 3.National Electrical Grounding Research Project (NEGRP)– Pawnee Site Excavation

• The NEGRP was started in 1992 to compare the long-term performance of different types of grounding electrodes.

3/4” x 10’ galvanized rod removed after 10 years

• In 2003, one of the original sites (Pawnee) was excavated and the electrodes removed • 5/8” copper bonded and ¾” galvanized rod samples were exhumed. • The results were definitive : • The 5/8” copper bonded rod was virtually free of corrosion while the ¾” galvanized rod showed significant deterioration (see the pictures on next slide).

Recommendations :


10 10

2‐Feb‐11

5/8” x 8’ Copper Bonded ground rod removed after 10 years

10 mil copper coating: Service life - up to 40 years.

UL 467 recommends 10 mils (0.25mm) of copper coating McML Protection Technologies Pvt Ltd

12 12

2 February 2011

3

2/2/2011


McML

Earthing & Bonding System Types of Earth Electrodes

UL 467 – Grounding & Bonding Equipment

• R

Vertically Electrodes •

E322481

•


2‐Feb‐11

McML

Integral chemical treatment

Ufer Earth •

13

Earthing conductor buried around building perimeter

Chemical Earth Rods •

•

A strip is buried in a trench in rocky area

Ring Earth •

•

2ft x 2ft x 6 mm copper plate is used.

Horizontal Strip Electrodes •

•

Pipe or copper clad steel

Plate Electrodes •

•


McML

Metallic conductor embedded in structural concrete


15


2‐Feb‐11

McML

Earthing Conductor Sizing

Electrode Shape

IEC 60364 ‐5 : Electrical installations of buildings •

Vertical Electrodes

Electrodes :

•

Plate Electrodes

• Copper bonded rod dia = 14 mm coating 90 microns minimum.

•

Horizontal Strip Electrodes

• Copper strip 50 sq mm ( 25 x 2 mm). • GI strip = 90 sq mm ( 30 x 3 mm) ( 60‐70microns) • GI Pipe = 25 sq mm ( 2 mm thickness)

The low current density can be achieved by designing the electrode in such a way that the dimensions in one direction is large compared to the other two, thus a pipe/rod has a much lower resistance than a plate of equal surface area. Plate Electrodes are not very common as they are not as effective as vertical electrode and also expensive. McML Protection Technologies Pvt Ltd

14

2 February 2011

Earthing Conductor: Min cross sectional area ( Cl 542.3) • Protected against corrosion

– 16 sq mm copper

• Not protected against corrosion – 25 sq mm. copper, 50 sq mm. Fe Equipotential bonding according to 413.1.2.1 of IEC 60364‐4‐41 ‐ 6 mm² copper; or – 16 mm² aluminium; or – 50 mm² steel


16

2

4

2/2/2011


McML


McML

Earth Resistance Testers

Earthing Conductor Sizing

• Ground Resistance Tester

IEEE 837

• 3 or 4-wire Tester • Types : • Analogue

Megger

Fluke

• Digital • Clam on

Digital McML Protection Technologies Pvt Ltd

17


2‐Feb‐11

McML

Soil Resistivity

Analogue


Clamp On 19


GEOHM

2‐Feb‐11

McML

Soil Resistivity Measurement – Wenner Method

Soil Resistivity (ρ)=2 ∏ a R McML Protection Technologies Pvt Ltd

18

2‐Feb‐11


20

2‐Feb‐11

5

2/2/2011


McML


McML

Typical Soil Resistivity


Soil Resistivity (ρ)=2 ∏ a R


21


2‐Feb‐11

McML



23


2‐Feb‐11

McML

Soil Resistivity - Effect of Salt, Moisture and Temperature

el 97-2003 Works


22

2‐Feb‐11


24

2‐Feb‐11

6

2/2/2011


McML


McML

Earthing Enhancing Compound

Soil Treatment to lower the resistivity

• Highly conductive cementious compound • Increases the contact surface area

Conventional Methods

• Homogeneous and stable

Use of sodium chloride, magnesium, and copper sulfates,or calcium chloride, to inc rease the conduc tivity of the soil immediatel y surrounding an electrode.

• Doesn't leach into the ground

•

State or federal authorities may not permit using this method because of possible leaching to surrounding areas.

• Environmentally Friendly

•

The salt treatment must be renewed periodically.

•

Corrode and damagethe earth electrode

•

• Doesn’t corrode the electrode • Enhances the life of earth electrode. • Low Resistivity • Suitable for all terrain • Can be used in dry or slurry form • Permanent and Maintenance Free •


25


2‐Feb‐11

McML

Soil Treatment to lower the resistivity

Comply BS EN/IEC 50164-7


(

27 27


McML

Graphite based Earth Enhancing Materials

Earth Enhancing Compounds •

BS EN /IEC 50164-7 : the European (CENELEC ) standard specifies the requirements for earthing enhancing compounds.

•

EEC effectively increase the diameter of the electrode by modifying the soil .

•

EEC increasesthe contact surface area of the earth electrodes.

•

Cathodic Protection – does not damage the earth electrode.

•

The EEC doesnot polluting the environment.

•

Note: Refill productsarenot inthescopeof the standard


26

2‐Feb‐11


28

2‐Feb‐11

7

2/2/2011


McML


McML

Earth Resistance

Earth Enhancing Compound- Application

Earth enhancement materials are typically placed around the rod in an augured hole or around grounding conductors in a trench, in either a dry form or premixed in a slurry.

Factors affecting Earth Resistance

1. Resistance of the electrode . 2. Contact Resistance between the electrode and the soil 3. Resistance of the soil from the electrode surface outward

• The first two are negligible part of total resistance • The resistance of an ‘earth’ is primarily determined by the soil resistivity


29


2‐Feb‐11

McML

Electrode Resistance Development


30


31


2‐Feb‐11

McML

Earth Resistance

2‐Feb‐11


32

2‐Feb‐11

8

2/2/2011


McML

Earth Resistance Calculation


McML

Earth Resistance of Vertical Electrode

The most commonly used formula for single ground electrode syste ms Developed by Prof. H B Dwight of the MIT. McML Protection Technologies Pvt Ltd

33


2‐Feb‐11

McML

Earth Resistance Calculation


35


2‐Feb‐11

McML

Earth Resistance of Vertical Electrode

el 97-2003 Works


34

2‐Feb‐11


36

2‐Feb‐11

9

2/2/2011


McML


McML

Deep Earth Electrode System

How to reduce earth resistance ?

McML ProtectionTechnologies Project :Deep Earth Electrode System

• Increase the length of the electrode?

Customer : Location : Design Engineer T NRao

Time :

Lengthand Dia of Electrode

• Increase the dia of the electrode ?

12 mm

(Ω-m)

50

Soil Resistivity

Rod Dia

17 mm

Rr={ ρ /2*π*lr}*{ln(4*lr /D)-1}, when

19mm

25 mm

Length (m)

0.012

0.017

0.019

0.025

1 2 3 4 5 6

38.27 21.89 15.67 12.33 10.22 8.75

35.50 20.51 14.75 11.63 9.66 8.29

34.61 20.06 14.45 11.41 9.48 8.15

32.43 18.97 13.72 10.87 9.05 7.78

• Use multiple earth pit ?

EarthResistance ‐H omogeneous soil 50

s 45 m h 40 O n 35 i e c 30 n 25 a t s 20 i s e 15 R

• Improve the soil resistivity ?

35.50

32.43 12 mm 17 mm

20.51

18.97

19 mm

14.75

25 mm

11.63

h t 10 r a 5 E

9.48

13.72

8.15

10.87 9.05

7.78

0

1

2

3

4

37


2 February 2011

McML

Deep Earth Electrode System

ApprovedBy

Mr.Sasirekha

Mr.T.N.Rao


39

2 February 2011

LORESS McML

Shallow / Deep Earth Grounding

Electrode Dia

Electrode length in m

38

Rev.No.:0

Earthing & Bonding System Shallow Earthing


6

Checked By

Mr.Sumadeep Form.No.:TEC-SFS-04


5

Prepared By

2 February 2011

Deep Earthing

Limited Electrode Length- 6 to 8 feet

Deep Driven Electrode > 12 feet

Doesn’t touch natural soil

Greater contact with low resistant natural soil Maintains consistent resistance over time

Earth enriching agents - salt, charcoal, are used

No such chemical agents are used.

Has environmental concerns

No environmental concerns.

Maintenance required

Maintenance free

Short term solution

Permanent & Economical solution


40 40

2 February 2011

10

2/2/2011


McML

Electrodes in Parallel


McML

Sphere of Influence – Spacing between electrodes

A useful rule is that grounding systems of 2–24 rods placed one rod length apart in a line, hollow triangle, circle, or square will provide a grounding resistance divided by the number of rods and multiplied by the factor F taken from Table


41


2 February

McML


43


2‐Feb‐11

McML

Sphere of Influence


42

2‐Feb‐11


44

2‐Feb‐11

11

2/2/2011


McML

Measurement of Earth Resistance


McML

Measurement of Earth Resistance - Fall of Potential Method

Fall of Potential Method


45


2‐Feb‐11

McML

Measurement of Earth Resistance


46


47


2‐Feb‐11

McML

Measurement of Earth Resistance - Fall of Potential Method

2 February 2011


48

2‐Feb‐11

12

2/2/2011


McML


Permanent Connections

LORESS

Mandatory acc. to the following Standards:

Exothermic Weld Connections • Permanent Joint

• ANSI IEEE Standard 80 “IEEE Guide for Safety in AC Substation Grounding”

• Durable and Reliable • Corrosion Free

• IEEE Standard 837 IEEE “Standard for Qualifying Permanent Connections Used in Substation Grounding”

• Offer no contact resistance • High Current Capacity • CPRI Testing

• ANSI UL 467 Equipment”

. The best choice w here safety, reliability, current carrying capacity and longevity are critical.


McML

Exothermic Welding Process

49 49

Earthing & Bonding System Exothermic Welding Process

“Grounding and

Bonding

• ANSI-J-STD-607-A “Commercial Building Grounding (Earthing) and Bonding Requirements for Telecommunications” ‐ 2011 ‐ 2 February


McML


2 Feb 11

LORESS

51 51

2 Feb 11


McML

Common Bonding Network (CBN) Earthing as a system The earth system has to be considered as an integrated system, telecommunications earth cannot be considered independently of power e ar th o r l i h tni n e ar th.. More than one earth systems will be connected to some equipment thereby c re ati ng c ur re nt p ath s th at mi gh t n ot h av e b ee n p la nn ed , m ig ht n ot b e adequate,or might not remain continuous. Circulating currents and potential differences between the earth systems can damage the equipment.


50

2 Feb 11



52

2 February 2011

13

2/2/2011


McML

Equipotential Bonding - Use of Isolation Spark Gaps

Non Conducting Parts of Installation


Conducting Parts of Installation

53


2 February 2011

McML


McML

Characteristics of an effective / good Earthing :

• Low in resistance and impedance. • Adequate current carrying capacity • Durable and reliable • Good corrosion resistance • Consistency in low resistance • A reliable life of 25 ‐30 years • Maintenance Free • Comply with national and international codes


55


2 Feb 11


McML

Common Bonding Network (CBN) •

Bond all ground points to eliminate ground loops and create an equipotential plane

•

Regulation requires that everything that is conductive is to be connected to the network of protective conductors to create building CBN

•

ear p s, wa er p pe ne, gas p pe ne an me a wor s caseetc )to be bonded together in an installation.

•

Use Isolation Spark Gap devices for equipotential bonding of Conducting and non conducting parts of the electrical installations.


54 54

me a s a r

2 February 2011

How effective is your Earthing System? • 90‐95% of all facilities inspected lack an effective Earthing system .


56

2‐Feb‐11

14

2/2/2011


McML


McML

Conventional / Traditional Earthing

LORESS

Here is the solution from McML…

TM

A Complete Maintenance Free Earthing Solution

Approved and Tested by International / National certifying bodies

R

E322481 McML Protection Technologies Pvt Ltd

57 57


CPRI



McML


2 Feb 11

Conventional Earthing

59 59

McML

Unique features of the solution … • Is bolt nut mechanism a permanent solution ?

• Is it touching the natural soil ? • Can it offer consistent resistance ?

LORESS

R

• Copper bonded Rods

• Is it non corrosive ?

2 Feb 11


E322481

• Compression Couplers • Earth Enhancing Compound • Connections using Exothermic Welding

• Can it carry the required current safely to ground ? • Is it Maintenance Free ? McML Protection Technologies Pvt Ltd

58 58

2 Feb 11



60 60

2

15

2/2/2011


McML

Copper Bonded Rods


McML

Compression Couplers

LORESS

R

• Used for joining two rods

E322481

• High tensile low carbon steel

• Deep earth electrode system

R

• Complies BS 4360 grade 43A

E322481

• Good rod to rod contact (tight fit)

• 6’ – 10’ long X ½” - ¾” dia • Molecularly bonded with 99.9% copper • Coatin thickness - 10mil 254 microns

• Preferred to Threaded ones •

• UL listed Rods

eg g

e

es s ance

• Higher Current carrying capacity

• Tensile strength of min 600 N/mm 2 • Bending strength of min 12.12 KN

• Durable and reliable

• CPRI + tested – 23 kA for 1 second

• Percussion strength of min 200N .

• Meets IS:3043 , UL 467, EN 50164-2standards

• CPRI + tested – 23 kA for 1 second

• Service Life - up tyo 40 years


61 61


2 February 2011

McML


63 63


2 Feb 11


McML

Earthing Enhancing Compound Test Reports R

E322481

Test Reports & Approval: Complies BS EN/IEC 50164 ‐7

•

UL Conformance Certificate

•

Tensile Strength test report

•

Stripping Test report

• Compression Test Report

•

Bending Strength Test report

• pH Measurement Test report

•

Coating Thickness test report

• Solubility in acidic environment Test report

•

Current Carrying capacity test report

• Resistivity Test Report

• Leaching of Fe Cu Zn Ni Cd Co Pb Test Report • Sulphur Determination Test Report. • Environmental Safety (RoHS) Test Report. • Pollution Control Board Certificate


62 62

2 February 2011


64

16

2/2/2011


McML

Earthing Enhancing Compound

LORESS


McML

Horizontal Earthing or Ring Earthing

LORESS

High Voltage/Current Test


65 65

Earthing & Bonding System Electrode Surrounded by Earth Enhancing Compound



McML


2 Feb 11

LORESS

67 67

2 Feb 11


McML

Exothermic Weld Connections

LORESS

• Permanent Joint • Durable and Reliable • Corrosion Free • Offer no resistance • High Current Capacity • Tested at CPRI

. The best choice where safety, reliability, current carrying capacity and longevity are critical. McML Protection Technologies Pvt Ltd

66 66

2‐Feb‐11


68 68

2 Feb 11


17

2/2/2011

Earthing & Bonding System Earth Chamber

McML LORESS

Earthing & Bonding System 300x25x6 mm Cu Bus Bar mounted on wall with insulated studs 50

McML

Inspection chamber 200

Handle for lid 50

Stainless steel Bolt and nut

Insulated 10 sq mm copper cable

Concrete Cover 250x250x25mm 0 0 1

EBB

0 0 2

Cement concrete Chamber 300x300x300 mm

Exothermic Weld “Conducrete” EE

m u m i n i m M 8 . 1

Compression Coupler Augured Hole length 6 to 8 feet with 4 to 6” Dia

Natural Soil

6’(1800 mm) x ¾” (17.2 mm) Copper bonded MS Rod

A 300X300X300 mm Prefabricated concrete box


69 69

RDSO/SPN/197 : 2008 50

Inspection chamber 200


McML


2 Feb 11

Earthing & Bonding System 300x25x6 mm Cu Bus Bar mounted on wall with insulated studs


LORESS

71 71

m u m i n i m M 8 . 1

2 2 February 20

McML

Ring Earth or Earth Grid

LORESS

Handle for lid 50

Concrete Cover 250x250x25mm 0 0 1

EBB

Stainless steel Bolt and nut

0 0 2

Insulated twin 35 sq mm Exothermic copper cable Weld

Cement concrete Chamber 300x300x300 mm

“Conducrete” EEC

Augured Hole length 6 to 8 feet with 4 to 6” Dia 10(3000 mm) x ¾” (17.2 mm) Copper bonded MS Rod

Natural Soil


70 70

2 Feb 11



72

2 Feb 11


18

2/2/2011


McML


LORESS LORES S

McML

™ E azy azy E a ™ Earth rth ™

BS /EN

An InnovativeMaintenanceFree Earthing System from McML

50164-7

LORESS

Conventional

Maintenance Free Earthing

Earthing

concrete Chamber 300x300x300 mm

E azy Earth rth ™ Appl icati ons : azy E a

GI / CI Pipes –Corrosion

Copper Bonded Steel Rods

Inadequate Galvanization ( 60-80 microns)

Adequate copper bonding 254 Microns

Shallow Earth Electrode – 8-10 feet

Deep Earth Electrode – upto 40 feet

Doesn'ttouch thenaturalsoil

Greater contact with natural soil & moisture

Inconsistentresistance

Consistent resistance

• Telecom Towers & Microwave antennas

Corrosive agents - salt, charcoal are used

No corrosive agents are used.

• Transmission & Distribution Systems,

Nut & Bolts –loose or corroded

Exothermic Welding - Permanent

Installation requires more space

Installation requires less space

Maintenancerequired

Maintenance free

Short life 2 to 4 years

Long life 25 – 30 years


• Computer & Data Processing Centers, • Bank ATMs

73


EazyEarth Electrode

• Lightning Protection Systems

•

Oil Refineries & Pumping Stations.

•

All Factories

LORESS RFC 25

• Equipment Body Earthings. • Residential & Commercial Buildings

2 February 2011

McML

™ LORES S ™ E azy LORES Earth rth ™ azy E a


75

2‐Feb‐11


McML

McML

Protection Technologies

BS /EN 50164-7

An InnovativeMaintenanceFree EarthingSystem from McML

azy E a E azy Earth rth ™

•

• Railway Communication & Signalling Equipment

TM

Salient Features :

LORESS

highly conductive offer larger conductive surface area lower the earth resistance by 30‐40%

A complete Maintenance Free Earthing System

GROUNDING AND BONDING EQUIPMENT (KDER)

offer less seasonal variations in Ohmic value offer lower surge impedance corros on roo

pprove

y

Theft Proof homogeneous and Stable hygroscopic

R

maintenance Free environmentally Safe

E322481

suitable for all terrain

Underwriters Laboratories Inc

last long ‐ 25 years easy to install McML Protection Technologies Pvt Ltd

FILE NO. E322481 74

2‐Feb‐11


76

2‐Feb‐11

19

2/2/2011


McML

McML


McML

Protection Technologies

Professional & Skilled Staff TM

LORESS A complete Maintenance Free Earthing System

Tested by

Central Power Research Institute, Bangalore

Short Time Current Capacity 23.25 kA RMS 1.05 sec & 44.90kA peak Report No. SC 07424A McML Protection Technologies Pvt Ltd

77


2‐Feb‐11

McML


79 79


2‐Feb‐11

McML

MAJOR CUSTOMERS

McML Strengths • Design Expertise • Well Trained Professionals • Superior in Quality ….as per UL / IEEE / BS /IS • Strong in Sourcing • Timely Delivery • Execution: Skilled Man Power


78 78

2 Feb 11



80 80

2‐Feb‐11

20

2/2/2011


McML

LORESS McML


Beware ! • Spurious and substandard products in the market

An ?

eg. Pipe in Pipe or Flat in Pipe or any other Chemical earthing Maintenance Free Earthing have no relevance to any national or international standards.


81


2‐Feb‐11

McML


83 83


2‐Feb‐11

McML

Substandard products in the market

Thank You For further information please contact: Mr T N Rao Vice President –Technical Mob : +91-9704456808

Pipe in Pipe Electrode after Two Years Copper Bonded Rod after 10 years

McML Protection Technologies Pvt Ltd 42, Vijaypuri Colony, Sainikpuri, Hyderabad Tel : +91-40 -4002 1604 Fax : +91-40-4012 0478


82

2‐Feb‐11

[email protected] McML Protection Technologies Pvt Ltd

21

Electrical Earthing and bonding system

Recommend Documents