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Electrical books and guides

Electrical engineering is a field of engineering  that generally deals with the study and application of electricity, electronics  and electromagnetism. Many companies and industry experts has been releasing technical books and guides in order to spread their knowledge, so they are all here, presented for you.

Nikola Tesla - Serbian-American inventor, mechanical engineer, and electrical engineer
Nikola Tesla – Serbian-American inventor, mechanical engineer, and electrical engineer

Basic idea of energy generation

Prior to the discovery of Faraday’s Laws of electromagnetic discussion, electrical power was available from batteries with limited voltage and current levels. Although complicated in construction, D.C. generators were developed first to generate power in bulk.

However, due to limitation of the D.C. machine to generate voltage beyond few hundred volts, it was not economical to transmit large amount of power over a long distance. For a given amount of power, the current magnitude (I = P/V), hence section of the copper conductor will be large.

Thus generation, transmission and distribution of D.C. power were restricted to area of few kilometer radius with no interconnections between generating plants. Therefore, area specific generating stations along with its distribution networks had to be used.


Changeover from D.C. to A.C.

In later half of eighties, in nineteenth century, it was proposed to have a power system with 3-phase, 50 Hz A.C generation, transmission and distribution networks.

Once A.C. system was adopted, transmission of large power (MW) at higher transmission voltage become a reality by using transformers. Level of voltage could be changed virtually to any other desired level with transformers – which was hitherto impossible with D.C system.

Nikola Tesla suggested that constructionally simpler electrical motors (induction motors, without the complexity of commutator segments of D.C motors) operating from 3-phase a.c supply could be manufactured.

In fact, his arguments in favor of A.C supply system own the debate on switching over from D.C to A.C system.

Note that all documents in this section are free to download.
 

No. Description Download
1 Electrical power supply and distribution
Electrical power systems can be composed of the following: subtransmission lines to main substations; distribution lines to distribution substations; utilization lines to distribution transformers…
.
2 Energy-Efficient Electric Motor Selection Handbook
A motor’s rotor must turn slower than the rotating magnetic field in the stator to induce an electrical current in the rotor conductor bars and thus produce torque. When the load on…
.
3 Coordinated Power Systems Protection
This manual establishes the criteria for design, coordination, and construction of power systems for military projects. A secondary purpose is to acquaint designers with the general…
.
4 UPS selection, installation and maintenance
The purpose of this publication is to provide guidance for facilities engineers in selecting, installing, and maintaining an uninterruptible power supply (UPS) system after…
.
5 Engineering Symbology, prints and drawing
The Engineering Symbology, Prints, and Drawings Handbook was developed to assist nuclear facility operating contractors in providing operators, maintenance personnel, and…
.
6 Grounding and Bonding
The objective to this manual is to define the state of the art and most commonly accepted practices for an integrated set of grounding and bonding practices for design and installation…
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7 Handbook of electrical safety
The design of new facilities shall conform to relevant DOE Orders and should conform to industry recognized engineering design standards. Existing facilities should evaluate their…
.
8 Handbook of electrical science VOL. 1-4
The information in the handbook is presented to provide a foundation for applying engineering concepts to the job. This knowledge will help personnel more fully understand…
.
9 Personal Protective Grounding for Electric Power Facilities and Power Lines
This guide establishes clear and consistent instructions and procedures for temporary grounding of deenergized and isolated high-voltage equipment (over 600 volts)…
.
10 Electrical Installation Guide
The Electrical Installation Guide is a single document covering the techniques, regulations and standards related to electrical installations. It is intended for electrical professionals…
.
11 Harmonic detection and filtering
The frequency spectrum is a practical graphical means of representing the harmonics contained in a periodic signal. The graph indicates the amplitude of each harmonic order….
.
12 Introduction to Motor and Generator
Written by, and with the advice of, senior technicians in these ratings, this series provides beginners with fundamental electrical and electronic concepts through self-study…
.
13 Medium Voltage Cables – Construction Standard Specifications
This specification includes medium voltage cables, and accessories for systems rated above 2001 volts to 15,000 volts. All medium voltage cables installed and existing cables spliced…
.
14 Electrical Power Supply And Distribution
Electrical power supply and distribution features will be planned/delineated concurrently with planning stages of new installations and/or new facilities on existing installations…
.
15 Electrical Installation Handbook – PART I
The scope of this electrical installation handbook is to provide the designer and user of electrical plants with a quick reference, immediate-use working tool…
.
16 Electrical Installation Handbook – PART II
The international reference Standard ruling the installation and calculation of the current carrying capacity of cables in residential and industrial buildings is IEC 60364-5-52…
.
17 Instrument-Transformers – Part 1 of 3 Current Voltage Transformers
In any electrical system power system, instrument transformers forms part of main components in metering (reading instruments, recording instruments, tariff systems),…
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18 Instrument-Transformers – Part 2 of 3 Current Voltage Transformers
Voltage transformers (VTs) are also classified along with current transformers (CTs) as instrument iransformers. These are shunt connected devices intended to reproduce…
.
19 Instrument-Transformers – Part 3 of 3 Current Voltage Transformers
Current transformers (CTs) are used in all electrical power systems for metering and protection applications. These devices reproduce analog secondary current (Is)…
.
20 Electrical Engineering Formulas
The theoretical foundation for EE is electromagnetism. The theory of classical electromagnetism is based on Maxwell’s equations, which provide a unified description of…
.
21 How Power Factor Corection Works
As with any equipment, an electrical system handles its job to some degree of efficiency ranging from poor to excellent. The measure of electrical efficiency is known as Power Factor…
.
22 How To Apply Capacitors To Low Voltage Power Systems
In most modern electrical distribution systems, the predominant loads are resistive and inductive. Resistive loads are incandescent lighting and resistance heating…
.
23 Power Factor Correction And Harmonic Filtering In Electrical Plants
The power factor correction obtained by using capacitor banks to generate locally the reactive energy necessary for the transfer of electrical useful power, allows a better and…
.
24 Power Factor – The Basics
KVAR is Reactive Power. It is the power that magnetic equipment (transformer, motor and relay) needs to produce the magnetizing flux. KVA is Apparent Power…
.
25 Lighting Handbook
Colour is a subjective psycho physiologic interpretation of the visible electromagnetic spectrum. Luminous sensations or images, produced in our retina, are sent to the brain…
.
26 HV AC Circuit breakers – IEC 62271-100
The major changes introduced in the 2001 issue of IEC EC 62271-100.
.
27 A Simple Approach To Short Circuit Calculations
Several sections of the National Electrical Code relate to proper overcurrent protection. Safe and reliable application of overcurrent protective devices based on these sections…
.
28 Complete Patents Of Nikola Tesla
Nikola Tesla (1856-1943), was the discoverer of the alternating current light and power system in use all over the world today. His inventions should have made him a multimillionaire…
.
29 Electricity and Magnetism
“Charge” is the technical term used to indicate that an object has been prepared so as to participate in electrical forces. This is to be distinguished from the common usage…
.
30 The Wire and Cable Technical Information Handbook
Cables often need to be placed in areas where they are subjected to harsh mechanical stresses. These stresses could damage the insulated conductors or the optical fibers…
.
31 Understanding Arc Flash Hazards
This Spreadsheet uses the formulas stated in the Guide to automatically perform the calculations to obtain incident energy, and arc flash hazard distances…
.
32 De-icing EHV Overhead Transmission Lines by Short circuit Currents
De-icing methods using techniques such as conductor heating or mechanical de-icing using a roller are possible for overhead lines ranging from 25 to 245 kV…
.
33 Designing Low Voltage Non-Motor Industrial Feeder Circuits
The National Electric Code (NEC) defines the continuous current rating of a conductor as ampacity, which means “the current in amperes that a conductor can carry continuously…
.
34 Electrical network protection guide
Among their multiple purposes, protection devices: contribute to protecting people against electrical hazards, avoid damage to equipment (a three-phase short-circuit on medium-voltage busbars…
.
35 High Resistance Ground Application Guide
An ungrounded system is defined as a system of conductors with no intentional connection to ground except through potential indicating and/or measuring or other very high…
.
36 Faults on electrical system explained in details
In Electrical system there is an interrupted system called Fault, a connection or a situation that causes an unbalance among the three phases. That can be broken down into three…
.
37 Roadway Lighting Design Manual
This Roadway Lighting Design Manual has been developed to provide training on the design of roadway lighting systems. Participants will learn the fundamentals needed to design…
.
38 Arch Flash Hazards – LV Circuit Breakers
There are essential requirements for electrical safety. Both domestic and international standards refer to steps and procedures to be taken for protection against hazards from…
.
39 Arc-flash Application Guide (Arc-flash Energy Calculations for Circuit Breakers and Fuses)
The idea that short-circuits or faults in an electric power system are undesirable is certainly not a novel concept. Recently, however, arcing faults have begun to receive an…
.
40 Current Transformers Selection Guide
Insulation level continuity for the whole installation will be ensured if the rated voltage of the CT used is the rated voltage of the installation. The rated voltage determines the insulation…
.
41 Elements of Electrical Engineering – Intermediate Vocatioinal Course, 1st Year
Concept of transformation: By the application of Kirchoffs Laws some problems cannot be solved and finds great difficulty due to number of equations. Such problems can be…
.
42 Determining Correction Factor of Power Cable Sizing
The initial aim of the thesis is to provide new findings in term of power cable sizing adjustment which later is deemed right for normal operating purposes…
.
43 Protection and Control Guide
There are 2 types of system equipment, the type that intervenes and the type that does not intervene at the time of a fault. Passive equipment – This category comprises all equipment…
.
44 High power Electronics – HVDC and SVC
The general aspects, including application and build up, of High Voltage Direct Current (HVDC) power transmission systems and Static Var Compensators (SVC) will be described…
.
45 Transformers, Generators and Protection Theory
When we enter into the topic of generator loading we must consider whether or not the connected electrical system is very large and hence strong or smaller and weaker…
.
46 The Role of Infrared Testing at Data Centers
The economic impact of downtime at data centers is the highest in the commercial sector. Therefore, the return on investment of predictive maintenance activities, especially infrared…
.
47 High Voltage Engineering – Practice and Theory
In this book the term high voltage is used as a generic term to include all voltages higher than 1000 volts, although the emphasis is on the typical voltage levels used power systems…
.
48 Medium Voltage Design Guide
In order to design a medium-voltage cubicle, you need to know the following basic magnitudes: Voltage, Current, Frequency and Short-circuit power. The voltage, the rated…
.
49 Principles of Insulation Testing
Most electrical equipment in utility, industrial, and commercial power systems uses either 50 or 60 Hz alternating current. Because of this, the use of an alternating current source to test…
.
50 Earthing of MV and LV Distribution Lines: A multi-faceted problem
The paper discusses the specific issues Eskom has to take into consideration when making such design choices. Eskom’s uses 22kV system technology primarily for new networks…
.

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73 Comments


  1. Hein thu
    Nov 14, 2019

    I would like to know about low voltage distibution and protection system


  2. Godswill Essienta
    Aug 18, 2019

    thumbs up


  3. Bazeer Ali
    Aug 01, 2019

    Thanks a lot for your free service(providing free download).

    God bless you.

    Your website helping me/non electrical background persons lot.


  4. Leslie
    Jun 03, 2019

    Hello to everybody. I want to find a good textbook in English on Power Elecrical Systems for industrial enterprises, the design of power supply systems of industrial enterprises like Boeing, General Motors, Ford, VW, etc. I found some textbooks in Russian (Dr. Konyukhova, Moscow Power Energetic University) but I wish to have textbooks on the same topic by American authors. Who can be recommended?


  5. abhishek chandel
    May 31, 2019

    seriously you are a great man .
    , thank you very much.


  6. abhishek chandel
    May 31, 2019

    great work seriously , thank you very much.


  7. Sonny Abbie
    Jan 29, 2019

    Hi Edvard,

    In street lighting design /or installation? Is the STREET LIGHTING POLE need to be bonded direct to earth for each Pole? is there any specific reference standard?

    please.. provide if there is


  8. Josam Daka
    Nov 29, 2018

    I am looking for sample drawings for Power & Control circuits for a 75kW Soft Starter including PLCs, HMI, Utrasonic level sensors, Utrasonic flow sensors, drive-end and non-drive-end bearing sensors, termistors and associated relays suitable for a Water Pumping Solution


  9. M Iqbal Khan
    Sep 27, 2018

    Dear All,

    I am facing a problem, we have a single 9R32 Wartsila engine and loeri somer alternator. ABB Unitrol 1000-15 A AVR. the generator produces 5.5 kV and then a step up transformer make this 11kv and then step down transformer. the generator trips at overvoltage first stage at 112% at any load during operation.

    Checked following;
    IR for alternator { main stator, main rotor, exciter stator, exciter rotor}
    Diode testing cold and with 24 VDC
    PT IR testing secondary circuit
    resistance with ground
    MCBs replaced
    The star point of the secondary circuit and its grounding.
    the resistance of earting pits
    verified full excitation circuit.
    Everything found normal

    Could anybody help or give an idea or they faced this problem, please respond.
    Regards


    • Shahrier kabir
      Oct 03, 2018

      please check the varistor if its found okay then tightening the diode and other equipment…..Good Luck


  10. C.SUBRAMANIAN NAMBISAN
    Sep 11, 2018

    EEP website is doing a wonderful job of providing informative articles to practicing engineers.It is a great effort to keep it going.
    Many Many thanks ,CS Nambisan


  11. NEEMA SILAU
    Jun 25, 2018

    This is really useful, thank you team.


  12. HUMAYUN AKHTAR
    May 22, 2018

    I NEED A LITERATURE HOW TO FIND FAULTS AND TROUBLE SHOOTING IN MEDIUM VOLTAGE CABLES.THERE IS A VAN TESTED WITH INSTRUMENTS TO CHECK AND LOCATE THE FAULTS IN MEDIUM VOLTAGE CABLES.WHAT IS HOT POT TESTS.


  13. moham
    May 09, 2018

    Hello ,
    I already had a request to choose a cylindrical insulator, with the help of your website I made the choice.
    Thank you.


  14. moham
    Apr 24, 2018

    Hello
    I need guidance to select the cylindrical insulator for the switchgear.
    (Selection with the formula and IEC standard)

    can you help my?
    Thank you
    korojdehime@gmail.com


  15. kamal naser
    Apr 09, 2018

    first of all i want to say thanks for such a nice site
    after that I need an excel calculation sheet for street lighting and park lighting
    thanks


  16. Zar Ni Thein
    Jul 12, 2017

    Dear Sir/Madam

    Please kindly help me to get IEC standard for my reference. I am looking long time to download for this , but till now i can’t get it.


  17. Paddy Keys
    Jun 28, 2017

    Has anyone have excel software to determine Earth Fault on the network , how different is it to Fault level calc’s


  18. Yogin Rawal
    Jun 12, 2017

    Hello every one,

    Q-1: (a) Can some one provide an example of a “T-Connection” from 220 kV to 220 kV transmission line without any normal/required protection equipment and controls?
    (b) What danger this type of connection poses to the TL and all connected the Substations?
    Q-2: Is there a British Electrical Code gives examption from installing Automatic Fire Protection System? Reference please.

    Thank you,

    Yogin


  19. SABER
    May 04, 2017

    Dear Sir
    i need to know if there are any international stander for the % of spare line “fully equiped with CB” should be kept inside each switchgear ,switchboard and distribution board?
    also the % of space line ” free of devices” should be kept inside each switchgear ,switchboard and distribution board?


  20. Rajesh Kumar
    Apr 29, 2017

    Good post. I am very interested in electrical repairing work and that is why I like to read blogs about electrical work. Keep updating more and also write more on other topics. Because I love this field I do ac servicing work.


  21. Jose Antonio Cayón
    Apr 18, 2017

    I would like to know about the Direct Current Motor Starter Design. How do you design the start resistance and the number of them?

    Thank you very much in advance.

    Congratulations for your portal (EEP)


  22. abhijit
    Mar 05, 2017

    Dear sir,

    we have to make contact of switch upto 150A how to select the cross section area for rated current 150A


  23. Chandran C
    Feb 27, 2017

    Thanks for the wonderful tips. We are into home appliance service and blogs like these are very helpful to us. Keep writing more.


  24. Bazic
    Feb 22, 2017

    Thank you so much for your efforts, this website is very useful
    Is it possible to download all documents at once ?

    Regards


  25. Tran Nguyen Chau
    Feb 15, 2017

    This is the best web site ever for basics of electrical engineering!!


  26. Dharmendra
    Feb 07, 2017

    I have a 150 KVA generator. It suddenly developed a malfunction recently. When it is switched on, it runs for about 30 seconds and then goes off. It is electronically switched on or off.


  27. Muhammad Abbasi
    Jan 09, 2017

    Dear EE Portal,

    Thanks for having such informative website.I am looking for quite long about Electricity metering sp[specifically define kwh meter, var and var hour meter and smart meter.

    If their is any book regarding metering please send me on engrmhabbasi@gmail.com


  28. Ashok
    Dec 13, 2016

    hello sir,

    Please clear my confusion. While calculating load currents for sizing the cables, which P.F.should be used?? Old or new after compensation..? and also i heard that reduced cable size depends on the type of compensation.i.e. global, sector or individual…please explain.


    • Abhiram
      Dec 21, 2016

      Hello,

      If you are talking about XLPE cables, then the power factor to be selected as per the load type. If it is residential, then you can go to 0.8 or below ; if it is commercial/ industrial you have to go to 0.9 or unity (If full motor/ pump loads).
      You can select/ alter the PF as per the local authority approvals only.

      For Fire pumps, large motors & AC units(with motor) always consider starting current as 1.5 times the normal load as standard to size the MCCB/ Isolator rating & then select the cable size accordingly.

      regards,
      Abhiram Ajay
      Dubai


  29. Sanket Saxena
    Nov 12, 2016

    plz upload any book for practical thinghs mean to say book only linked how to use thinghs pratically which enhance our innovation skills


  30. Krishnan C
    Nov 08, 2016

    I like working on electronics very much. And that is why I have chosen the field of computers and printers. Good post. Keep updating more.


  31. Bipin nena
    Nov 05, 2016

    Dear sir,

    I always learning with EEP, the best site for electrical,
    Sir I want to DOE fundamental of electrical science vol. 2 of 4, hear in site I just see vol. 1 of 4,
    So please can you add in hear. ?


  32. Rizwan Ahmed Rafiq
    Sep 29, 2016

    Can you please explain the function of Load Bank?
    How can we size the Load Bank?


  33. Krunal Shah
    Sep 28, 2016

    How can we upload a video on your this site?


  34. Md. Ashraful Alom
    Sep 05, 2016

    hi,
    thank you very much


  35. Md. Ashraful Alom
    Sep 05, 2016

    hi,
    can i get help you for the procedure.


  36. LOGANATHAN
    Aug 19, 2016

    Dear sir, I AM A REGULAR READER FOR THIS SITE. I AM A RETIRED ELEC ENGINEERING FROM .DEPt OF SPACE, ISRO IN INDIA.I AM SHARING THIS SITE CONTENT WITH MY FRIENDS IN ISRO.
    IT IS WELL RECEIVED BY THEM & APPRECIATED BY THEM. AS SUCH I DO NOT HAVE A PAYPAL ACCOUNT. I AM INITIATING ONE &SHORTLY I WOULD LIKE TO MAKE A DONATION TO THE GOOD CAUSE FOR THE ELECTRICAL ENGINEERS (AND FOR THE SUBJECT) BY YOUR INITIATIVE . REGARDS.


  37. Marchester Real Bakah
    Jun 22, 2016

    Can i get help for the procedure for Calculating Three-phase fault current for symmetrical/unsymmetrical systems


  38. PAULOSE V P
    Oct 29, 2015

    I am very pleased to know the difference between symmetrical three phase system and balanced three phase system. Please let me know symmetrical systems and balanced systems.

    Rgds
    Thank you


  39. Javier Mitchell
    Aug 09, 2015

    Hello Engineering Portal Team.
    Congratulations for this wonderful site.
    I have found exactly what I needed.
    Sory I can not donate at this moment, But this
    Engineering portal really deserve a donation just
    as many other wonderful sites on the WEB.
    please dont give up our portal. Keep on.
    Great Thanks to you all.


  40. Anwar Ali
    Aug 08, 2015

    I want to know about the current and voltage role in human body killing (death and electric shuck). I studied many articless/books about it but some are saying current kill people while some are stating voltage. In my opinion it is frequency as in our country frequency is 50Hz and voltage is 220 P-P. It usually kill people while electrocuted. In the country I am working the frequency is 60Hz and the voltage is same 220 P-P and I did not hear that some one electrocuted and died.

    As we go down in reducing frequency the system is going to DC nature which is more danger than AC.

    Please explain so that I can make clear my concept.


  41. Ernest
    May 26, 2015

    Good work


  42. Ernest
    May 26, 2015

    I am electrical engineering student , and i want to know more about power transformers.Thank you for the good job.


  43. Luis Lemus
    Mar 04, 2015

    Good day, first of all i would like to congratulate all of you for such an amazing portal. Contributions are great and i feel like i can keep learning each day a little bit more. I do have one request to make, if possible. I am currently working my thesis and i am interested in power quality for a call center building; specifically i am looking for information about the IEEE.Std. 1100. If you could share something it would be great. Greetings and keep up the great job!!!


  44. Zreik
    Feb 17, 2015

    can u Upload some article about Selectivity for DC Auxiliare low voltage?


  45. Sayed Yusuf Ali
    Dec 25, 2014

    Excellent. Keep it up.


  46. prem
    Dec 06, 2014

    Good


  47. SUNIL
    Sep 19, 2014

    Can you upload some article with respect haradous area classification as per IEC 60079. Easy to understand.


  48. Sabariprakash
    Sep 05, 2014

    Hi sir..
    I am having confusion in selection of alternate motor against the installed one.Here i will give the details of installed & alternate motor which i decided for procurement.

    Installed 3 phase Squirrel cage IM:
    Supply Voltage=415v; P=22Kw; Rated Torque=131.7Nm; speed=1468rpm; Frame Size=180L; Rated Current=37.2A(VFD duty Motor); NDE bearings=6210 ZC3 ;DE bearings=6210 ZC3; Cooling Method=IC416 ;

    Proposed 3 phase Squirrel cage IM:

    Supply Voltage=415v; P=22Kw; Rated Torque=143Nm; speed=1473rpm; Frame Size=180L; Rated Current=38A; NDE bearings=6310 ZC3 ;DE bearings=6310 ZC3; Cooling Method=IC411 ;
    Kindly suggest me to procure the proposed one or not and request you to give the detailed articles regarding selection of different motors with known motor.


  49. cameron
    Jun 22, 2014

    Hey guys. I need help on developing a distance relay in Matlab/Simulink. Can anyone perhaps assist me?


  50. Vele
    Jun 19, 2014

    Hi Sir,
    I’d like to know more about earthing transformers and neutral grounding resistors, their applications and why they are required. You have any information on this that can be useful for my project?


    • nbn
      Aug 28, 2015

      Any of the trafo needs to be grounded that is 2 earth pit of neutral earthing & 2 earth pit of body earthing.

      & neutral grounding resistor(NGR) panels are provided in HT DG panels


  51. Chanh
    Jun 01, 2014

    Hi Sir,

    i would like to know how to choose correct capacitor for run or start motor and can i use large or small capacitor than the existing one for motor


  52. vaishnavi
    Feb 14, 2014

    hi
    its really very useful
    can u help me in my project tat is gsm based power sharing of transformer with automatic load shedding system. can u give me detailed information about this.


  53. duru jonathan
    Feb 14, 2014

    I want to know more about how to read and solve a fault on electrical diagram.


  54. Leinad
    Oct 13, 2013

    Thank you for the very useful information.


  55. Hariprakash
    Aug 17, 2013

    Hello sir! i feel difficult to understand some concepts of Elec.engg like vector fields in electroagnetic theory,and finding hard to apply in problems,so my request is please make arrangements as these concepts are very important for an Elec.engg students.and also it will be useful for other students.
    I am waiting for your answer


  56. Badam
    Jan 30, 2013

    i am actually working on my project titled electrical design for an office building. I would like to know the recent technology available for cable laying and other safety equipments,


  57. I.P.
    Jan 14, 2013

    Thank You Very Much for this vast collection of resources.
    It’s Very helpful to EE students and licensure exam takers.


  58. ajit.atp
    Jan 13, 2013

    Hello Sir
    I am very much thank ful to you for your information.I hope others also gain knowledge from this.Thank u sir.


  59. ESSA
    Jan 05, 2013

    You are the best Edvard!


  60. ABD ELWAHID ELTAHIR
    Dec 25, 2012

    THANKS VERY MUCH, YOUR WEBSITE WILL BE MY HOME PAGE

    • Edvard
      Edvard
      Dec 25, 2012

      Thank you! Very kind of you!


      • MACAPADO MOTEN
        Jan 23, 2017

        I want to know how the master switch wired, hoping your response …


  61. cisnatel
    Jun 19, 2012

    Thank you very much.

  62. Edvard
    Edvard
    May 13, 2012

    Thank you all!!


  63. hamed
    May 12, 2012

    Your great and hard efforts too much appreciated .


  64. Ralvarez
    May 11, 2012

    I would like to thank you all for all this serious and helpful information


  65. lehuan
    May 01, 2012

    Thank you very much.


  66. prodaja
    Apr 26, 2012

    Great work, thank you very much!

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