Reviews (6)

Absolutely a Must Have for Anyone Involved with Electricity and Electrical Equipment

The Ultimate Reference in the Electrician's Trade
I can't say it better myself:"The purpose of this Code is the practical safeguarding of persons and property from hazards arising from the use of electricity" NEC 90.1(A)
Required reference for handymen and professional electricians
The National Electric Code, also knows as NFPA-70, is the standard that building officials use to define what is legal to use in electric services of all kinds.NFPA is the National Fire Protection Association.The Electric Code began almost as soon as Edison wired some of his new lights in New York, and the first electricity caused fire happened.Soon thereafter the National Fire Protection Association began writing safety codes aimed at preventing fires and promoting safe wiring techniques.Today, more than a century later, the Electric Code is republished every 3 years.As new inventions and new applications for electricity are ever expanding the code book expands and is revised to define the new applications. The 2005 edition has been updated to include recent developments in available materials and equipment.The code has 772 large pages detailing every electric installation from common house wiring to installation requirements for 35,000 volt transformers. The tables detailing how many conductors you can put in a conduit go on for 50 pages in the appendix.
Read more

Subjects:  1. Construction - Electrical    2. Electrical Safety Codes    3. Electricity    4. Engineering - Electrical & Electronic    5. Fire Safety And Prevention    6. Fire Science    7. Science/Mathematics    8. Technology    9. Technology & Industrial Arts    10. Electrical engineering    11. Electronics engineering    12. Explosives technology & pyrotechnics    13. Fire protection & safety    14. Occupational / industrial health & safety    15. Technology / Technical & Manufacturing Industries & Trades   

Reviews (3)

Absolutely a Must Have for Anyone Involved with Electricity and Electrical Equipment

Great quality book - oodles better than the paperback version
I bought this book because I am studying to be an electrician.I like it considerably more than the paperback version it is far easier to find section headings and sub-headings when you are looking for something.The paper is strong and glossy-white (as opposed to gray and flimsy in the paperback) and headings are in bold type and indented.
BUY THE HARDCOVER!!
What a waste of time, money and energy!!
Read more

Subjects:  1. Construction - Electrical    2. Electrical Safety Codes    3. Electricity    4. Engineering - Electrical & Electronic    5. Fire Safety And Prevention    6. Fire Science    7. Handbooks & Manuals    8. Science/Mathematics    9. Technology    10. Technology & Industrial Arts    11. Electrical engineering    12. Electronics engineering    13. Explosives technology & pyrotechnics    14. Fire protection & safety    15. Occupational / industrial health & safety    16. Reference works    17. Technology / Technical & Manufacturing Industries & Trades   

Reviews (9)

Excellent, full of examples, easy to follow
This book is one of the best, most thorough and well explained textbooks I have encountered in the past 5 years of school.The authors, one of whom is teaching my course, present their explanations in a way that is both thorough and accessible.This is not a cookbook by any means - it is a very solid, detailed foundation for power electronics, and doesn't gloss over the important concepts like other books in the field.If you're just looking for a reference book with equations, circuits, and tables, this isn't for you.However, if you're looking for a text to study and understand in detail, you'll be right at home.
Excellent, full of examples, easy to follow
This book is one of the best, most thorough and well explained textbooks I have encountered in the past 5 years of school.The authors, one of whom is teaching my course, present their explanations in a way that is both thorough and accessible.This is not a cookbook by any means - it is a very solid, detailed foundation for power electronics, and doesn't gloss over the important concepts like other books in the field.If you're just looking for a reference book with equations, circuits, and tables, this isn't for you.However, if you're looking for a text to study and understand in detail, you'll be right at home.
Lots of information with some open ended information
I would agree with the other reviewer that this is not a "how to" book. The book approaches the subject from an academic viewpoint. The reader is expected to fill in between the lines with previous experience. It appears that the authors, professors as U of C, supplement the text with worked out examples for their students. I would recomend it to people already versed in the subject and want more information.I found it for half price and this makes it worth buying as a reference. ... Read more

Subjects:  1. Electric Power Systems    2. Electronic Apparatus And Devices    3. Electronics - General    4. Engineering - Electrical & Electronic    5. Power electronics    6. Science/Mathematics    7. Technology    8. Technology & Industrial Arts    9. Electronics engineering    10. Energy Technology & Engineering    11. Technology / Electronics / Circuits / General   

Reviews (22)

New to Logic?You need this book.
My excitement at being the proud owner of Logic Pro 7 was quickly tempered by the sheer complexity of the software.I spent time with the included documentation and even bought another training book.But it was this book that unlocked Logic's power for me.
Tutorial for Beginners Only
I am new to Logic, but extremely well-versed in other DAW applications. I was looking for a book to cover hands-on issues not specified in the Logic manuals; what I found instead was a series of tutorials that mimic the information found in Logic. If the Logic Reference Manuals don't address a given topic - for example, dealing with latency issues or how to properly archive a project - don't expect it to be addressed here. You're paying for the same content covered again with better hands-on instruction, which may be of great benefit to beginners of the Digital Audio Workstation paradigm.
Recommended
Being a long time Logic user, i still like to study this book to see which areas of Logic I'm still a novice in. What I like about this book, is the Structure, with the chapters and the Tasks to fulfill. So it get's me closer to a streamlined workflow. ... Read more

Subjects:  1. Computer Books: General    2. Computer Graphics - General    3. Computers    4. Computers - General Information    5. Interactive & Multimedia    6. Stereo & Audio Equipment    7. Computer Software Packages    8. Computers / Interactive Media   

Reviews (19)

Very well written
I liked this book because it does a great job explaining the concepts and the reasoning behind the mathematical formulae. Other books such as "The Elements of Statistical Learning" toss the Math formulas at you and expect you to figure out the significance or the importance of 'em. The book does not shy away from Math - but does a great job presenting it.

Excellent introduction to top machine learning techniques
Duda's 'Pattern Classification' is an excellent book for an introduction to a range of the most powerful and popular machine learning methods. Obviously it doesn't go into very many details of each method - being just one book - but it covers the most important things to know imo. Not quite the 20% that covers 80% of the needs, but close. It is well written and the illustrations are generally of high quality. If you don't want to drown in a nightmare of details and exceptions, but rather get a good basic understanding of the various techniques, this book is an excellent buy.

A good introduction to pattern recognition, but not a bible.
[1] This book is good as an introduction to Pattern Recognition, at undergraduate level (compared with the level of Fukunaga's -Introduction to Statistical Pattern Recognition-).
Read more

Subjects:  1. Computers - General Information    2. Data Processing - Optical Data Processing    3. Electronics - Digital    4. Engineering - Electrical & Electronic    5. Pattern Recognition    6. Pattern recognition systems    7. Science/Mathematics    8. Statistical decision    9. Technology    10. Mathematics for scientists & engineers    11. Technology / Engineering / Electrical   

Reviews (92)

Thank you, David griffiths
This book is wonderful news to anyone who is frustrated with Jackson, or alternatively, is an excellent preface to it; Chapter 1 is particularly helpful as it presents all the necessary vector analysis, and is filled with illuminating geometrical interpretations to otherwise obscure mathematical creatures.
Worst book ever
A shining star in the quest for the most incomplete work ever published by credible institutions, David Griffiths triumphs over both the competition and his other works with his widely-distributed Third Edition of Introduction to Electrodynamics.
Book good, Amazon not
This book is a great introduction to electrodynamics and contains well worked out examples and good problems.
Read more

Subjects:  1. Electrodynamics    2. Electromagnetism    3. Physics    4. Science    5. Science/Mathematics    6. Communications engineering / telecommunications    7. Electricity, magnetism & electromagnetism    8. Science / Physics   

Reviews (4)

Superb instructional book for my needs
I bought this book for two reasons (a) I needed an overview of IP and (b) I wanted to examine different pattern analysis algorithms with a practical twist.On both counts, as an non-IP researcher, I was very satisfied.The book is very well laid out, so well in fact that it would put to shame many of its rivals.It served my needs.I can't comment on whether it will meet the needs of a broader community.I would certainly recommend it based on my experience.

Practical and Useful
This book educates the reader in image processing and MATLAB.While I am experienced in both, I found the book to be an extrememly useful reference book for projects involving image compression and image representation.The book offered practical descriptions and useful code for computing the fast wavelet transform.It was especially useful in describing how the edges should treated.This is a big issue that other textbooks gloss over.I had never seen it described in a textbook, and it was described so well.
The best of its kind.
If you want to get up to speed on Matlab and plan to use it for image processing, this book is a must.
Read more

Subjects:  1. Computer Books: Operating Systems    2. Computer Graphics - General    3. Computers    4. Computers - Other Applications    5. Digital Image Processing    6. Interactive & Multimedia    7. Matlab    8. Techniques - Digital    9. Applied optics    10. Computer Software Packages    11. Computers / Computer Graphics / General    12. Image processing   

Reviews (21)

There are better options
I own several books on Control Systems (including this one), but if you have to buy just one and you are in the process of choosing it, I would recommend Katsuhiko Ogata's Modern Control Engineering.
Sucks
Well first off the book does not do a good job of providing sufficient examples on how to do things. On top of that the solution manual you can get online through those 2 ppl that are selling it is useless. It has all the problems worked out wrong...just my luck!

Good Sections on PID and Multivariable
As a practicing engineer, I found the book's sections on PID controllers and Multivariable control to be more informative than my other references, including the venerable Ogata.
Read more

Subjects:  1. Automation    2. Engineering - Electrical & Electronic    3. Engineering - General    4. Engineering - Mechanical    5. Feedback Control Systems (Engineering)    6. Feedback control systems    7. Science/Mathematics    8. Technology    9. Technology & Industrial Arts    10. Automatic control engineering    11. Electrical engineering    12. Electronics & Communications Engineering    13. Technology / Engineering / Electrical   

Reviews (21)

Simply Excellent! Fully Justifies Its Price!
The preface of this book starts with a quote:
Excellent book for Image Processing
This book feeds the readers all the basic concepts of Image Processing. Very easily understandable and lucid in explanations. I would rate it one among the best EE books published so far.

OK book for 1st or 2nd year undergrads
I am giving this book 4 stars because it's quite descriptive and easy to follow.It covers some of the basic concepts behind digital image analysis and touches on the more general signal processing concepts, but it doesn't go very deep into the actual math.This may be what you want, but for me it was an assigned text for a 4th year undergrad course I took in college, and I found it inadequate.I felt like I could have written this book before I even started the class.At the same time, though, I think it would have been a great text for a more entry-level course.
Read more

Subjects:  1. Computer Graphics - General    2. Digital Image Processing    3. Digital techniques    4. Engineering - Electrical & Electronic    5. Image processing    6. Imaging Systems    7. Science/Mathematics    8. Technology    9. Technology & Industrial Arts    10. Technology / Engineering / Electrical   

Reviews (3)

Not Good Introductory Textbook Material
This is a required book for an introductory lighting class I'm taking.Since we are solely relying on this book and it isn't supplemented with lecture material, I find that, without familiarity with lighting terminology and concepts, it is very difficult to understand -- very cryptic with the seemingly overused language of the field.While the author may be very knowledgeable, I feel the book is not very well written and the target audience is, perhaps, not intended to be, essentially, the layman.I don't find the organization of ideas and concepts to be clearly laid out or communicated well and, as they unfold, and I come to understand what the author is trying to say,wonder why it was made so difficult -- is that all he means, geesh and why didn't he tell me that earlier.It would be easier to understand the general concept of things first, even in plain English perhaps, and then go on to a more technical description to learn the language of the field and get the details.Just seems to make simple things very complicated, especially with the language, flow of ideas, and phrasing.
Great teacher
While I was studying Interior Design at Parsons a number of years ago, I had Gary Gordon as a Lighting Design Instructor.He was by far one the best teachers that I had.He is very knowledgeable and has the unique ability to easily communicate the many aspects of both design and lighting. I highly recommend any publication he has authored.

Very good book for novices.
The book begins with an inspirational and somewhat simplistic insight into lighting design.Simply as a study of lighting contrasts.While this is a very important aspect of LD,it is by far one of many concepts a professional must use.The book refers to many technical aspects of lighting without giving any "meat" or more in depth information,which I would have enjoyed.If you are new to LD or are an architect or engineer who has little experience with lighting,it is a very good lauching point.If you are technically knowledgable about lighting and want some inspiration,read chapter 1 and the last chapter on Design for concepts ... Read more

Subjects:  1. Architectural Detail    2. Architectural Lighting    3. Architecture    4. Electric lighting    5. Engineering - Mechanical    6. Interior Design - General    7. Interior Design - Lighting    8. Lighting, Architectural and de    9. Lighting, Architectural and decorative    10. Architecture / Interior Design    11. Interior design   

Reviews (24)

A Must Have Step-by-Step Guide on Professional Techniques and "tricks of the trade

So far so good - Updated
After buying the Black and Decker Home Wiring guide and finding conflicting information, I decided I needed a more thorough reference (but didn't want to have to decipher the NEC).After a bit of research, I decided to buy "Electrical Wiring Residential".Within the first hour of reading it, I had two major questions answered that the B&D book didn't even attempt to address.While I've only had it for a day, I'm already 100% more satisfied with it than I was with the B&D book.My advice: buy this book instead of the less expensive ones if you paln on doing your own wiring and want it to be to code.
Best reference for teaching I've ever used
I teach NEC articles dealing with low-voltage issues and grounding to custom electronics installers.This is by far the best book I have ever used as a reference and I've seen a lot! The text is very clear, the illustrations are amazingly good.I have spoken with Ray Mullin the auther on many occassions and am always impressed with not only his knowledge but on the TLC (tender loving care) he puts into each edition. You can't go wrong with this reference. ... Read more

Subjects:  1. Construction - Electrical    2. Electric Wiring & Currents    3. Electric wiring, Interior    4. Engineering - Electrical & Electronic    5. Reference    6. Residential Construction    7. Science/Mathematics    8. Technology    9. Technology & Industrial Arts    10. Electrician skills    11. Technology / Technical & Manufacturing Industries & Trades   

Reviews (8)

I'm not a radar expert, but with this book I COULD BE!!!
Mr. Stimson's book, "Introduction to Airborne Radar (2nd Edition)," has been one of my most treasured purchases from my graduate school education. I expected a book filled with equations and bad graphs and tables - I was wonderfully surprised by the high quality graphics, easy to follow mathematical treatment, and historical views into past and present radar systems.
No other introduction needed
Stimson's second edition is a slight improvement over his first. "Slight" because improving near perfection remains a difficult task. Nowhere else is such clarity apparent in the complex field of radars. Thanks to Stimson this subject could be understood by my grandmother. If only Stimson would carry edition three to the next echelon, extending depth and detail to levels required to actually build and make a working, modern radar. Like applying his talent to the intricacies of adaptive processing, a completion of SAR computational demands and processes (vs. stopping at the digital filter FFT), nuances of ever more important phase noise, test, measurement and producibility of radar systems that shouldn't cost a million dollars per copy, but a fraction of this with proper processes and synergistic integration vs. the "Mister Potato Head" approach of slapping together the latest-greatest-of-every-subsystem-technology still practiced by engineers in just about everything. Unfortunately this may be our last version from Stimson as he's no longer a young man and such efforts are monumental. Even so, he's made himself a national asset creating this magnificent edition, probably lasting longer than any of us in the field today.

Not easy reading
I bought this book because I work with radar and would like to improve my understanding of it. This book is a good middle ground, but for a dummy like me, several chapters require re-reads.One of the most annoying things is that when the author describes related material, he doesn't compare and contrast as much as write one paragraph on the attributes of thing A and then another paragraph on thing B using all but two words that were used in the first paragraph. The reader must wade through this writing and then compare and contrast themself.Read more

Subjects:  1. Aeronautical Engineering (Specific Aspects)    2. Aeronautics & Astronautics    3. Airplanes    4. Aviation - General    5. Radar    6. Radar Technology    7. Radar equipment    8. Science/Mathematics    9. Technology    10. Technology & Industrial Arts    11. Aerospace & aviation technology    12. Technology / Radar   

Reviews (5)

Excellent
This edition is as useful as the earlier editions. Besides providing insight on almost all the topics of VLSI, the third edition also addresses several issues related to the sub-micron technology.

Rich engineering information from practice in VLSI
I have more than 15 integrated circuit design text book, this new edition is one of the best. It bridges academy with industry for VLSI, I like the part about "pitfalls" very much, it provides real lessons what industry has experienced. I like the way this book surveys related topics, for example, sequential circuits topics. It has a brief and good coverage on low power topic(covered in sections in differenct chapters). It also introduces Hspice with useful commands not seen in other text books.
Fantastic Text
The best book on VLSI out there!A must for all designers and professionals.This book gives insight that very few books on VLSI give.Its a treasure and a book to remain in one's collection well after that first, difficult yet exciting, semester in VLSI.A superlative book and read! ... Read more

Subjects:  1. Computers - General Information    2. Electronics - General    3. Integrated circuits    4. Logic Design    5. Metal oxide semiconductors, Co    6. Metal oxide semiconductors, Complementary    7. Science/Mathematics    8. Technology    9. Very large scale integration    10. design and construction    11. Electrical engineering    12. Technology / Electronics / General   

Reviews (36)

Digging for Gems
This is such a fabulous book taking a coffee break with the who's who of big producers.If you do music, you'll know there isn't really a shortcut to everything.That is why GREAT production work is such an art and everyone's got their way to make it sound..sound off effortlessly...if they're good.
The Lightbulb Came On
I've been recording at home for 20 years.For much of that time, I relied on Recording Magazine, tips from friends, and my ears to get by.My system was fairly simple - cassette-based multi-track, simple dbx compressor, and a few mics and digital effects.Then, it was time to move up.
A Must Have Book
This book is a definite must have if you are getting started in audio recording. I produce hip-hop & R&B beats on a Protools set up. This book has helped me turn hollow sounding music into a full sounding production. The question and answer section of the book gets some of todays best mixing engineers thoughts behind mixing. If your mixes dont sound the way they should and your seriously interested in making professional sounding music then read this book. ... Read more

Subjects:  1. Music    2. Music/Songbooks    3. Recording & Reproduction    4. Songbooks - General    5. Stereo & Audio Equipment    6. Computers / General    7. Music / Reference    8. Music recording & reproduction   

Reviews (4)

Absolutely a Must Have for Anyone Involved with Electricity and Electrical Equipment

Excellent Reference
Of the many reference and educational books I have read, this is one of the best. This book, the NEC Code and Practical Electrical Wiring by Herbert P. Richter and Frederic P. Hartwell have given me a thorough understanding of the NEC and the essential things I wanted to know before wiring a new residence.Highly recommended.

Nec Ilustrated book
It's a very important and easy book for all the people which have to work with the NEC. I liked it a lot. ... Read more

Subjects:  1. Construction - Electrical    2. Electric engineering    3. Electric wiring    4. Electrical Safety Codes    5. Fire Safety And Prevention    6. Insurance requirements    7. National Fire Protection Assoc    8. Reference    9. Science/Mathematics    10. Technology    11. Technology & Industrial Arts    12. United States    13. Electrician skills    14. Technology / Technical & Manufacturing Industries & Trades   

Editorial Review

This is the standard text for introductory advanced undergraduate and first-year graduate level courses in signal processing. The text gives a coherent and exhaustive treatment of discrete-time linear systems, sampling, filtering and filter design, reconstruction, the discrete-time Fourier and z-transforms, Fourier analysis of signals, the fast Fourier transform, and spectral estimation. The author develops the basic theory independently for each of the transform domains and provides illustrative examples throughout to aid the reader. Discussions of applications in the areas of speech processing, consumer electronics, acoustics, radar, geophysical signal processing, and remote sensing help to place the theory in context. The text assumes a background in advanced calculus, including an introduction to complex variables and a basic familiarity with signals and linear systems theory. If you have this background, the book forms an up-to-date and self-contained introduction to discrete-time signal processing that is appropriate for students and researchers. Read more

Reviews (23)

Destined for a standard?
It is my pleasure to comment on this book which I recently purchased. I have two of Dr. Oppenheim's previous books. This book is a core integration of a topic with too many diverse starting points (mine was digital filters derived from Prony's method, not in the book by name). Dr. Bose was my first EE Professor. Alan Oppenheim was my second EE instructor. Alan (just finished MSEE at the time) had not published a book yet, but his focus was always on your questions. His product was your understanding. If this book is for your shelf, it will not harm it. If this topic is for your mind, this book was meticulously written for you.Lance Webb, PhDEE

Six star book on Digital Signal Processing
This is the outstanding 2nd edition of Oppenheim's classic DSP book, which for over two decades was the only real choice for a textbook on the subject. That was too bad, since the first edition was probably the worst thing I have ever seen in print - terse, incomprehensible, and with only a few awful and poorly illustrated examples. When I decided to take a refresher course in DSP, I was horrified to see our class would be using the second edition of that horrendous text. What I found instead was a completely rehabilitated textbook! This is not a beginner's DSP textbook by any stretch of the imagination, but absolutely everything is explained and there are plenty of well worked out examples. The end-of-chapter problems are broken down into simple, intermediate, and advanced problems with quite a few mind-puzzlers in the advanced section. Plus, the answers to the first 20 problems in every chapter are in the back of the book.
Good book from initial reading
I haven't gone through this book all the way yet since classes haven't started; however, it seems to be a very well written book that is easy to get the necessary concepts out of easily.Once the class is done I will try to add a further review. ... Read more

Subjects:  1. Discrete Mathematics (Computer Science)    2. Discrete-time systems    3. Engineering - Electrical & Electronic    4. General    5. Mathematics    6. Science/Mathematics    7. Signal Processing    8. Technology    9. Technology & Industrial Arts    10. Telecommunications    11. Electrical engineering    12. Electronics engineering    13. Mathematical theory of computation    14. Technology / Engineering / Electrical   

Reviews (8)

Great resource for the working analog layout and design engineer.
I read the pre-print while still in college and continued to use it as i've progressed in my career. This book is a great collection of analog layout techniques for the real world, no analog IC designer should be without it. I continue to refer to it as i design different kinds of circuits that require alternative layout techniques. Great book overall!

Highly recommended for all levels of analog IC designers
The most detailed book that I have come across, addressing issues and design practices in analog layout (CMOS and bipolar). It is a combination of extensive layout experience (reflected in easy-to-use thumb rules) and the technical reasoning/nuances leading up to layout decisions. Strongly recommended not only for those starting out with their first design, but also for those who think they have a "feel" of layout practices without really knowing why.
Highly Recommended Book On Bipolar & CMOS
I own this book, as do several of my co-workers.At the time I purchased it, just after it became available, late 2002 if memory serves, I could find only a few books on the subject, including Dan Clein's 'CMOS IC Layout'.I was most happy with this book to teach analog layout techniques.I judged this book as the best, as it is more detailed, deeper, more technical, broader.(See my review of CMOS IC Layout for more comparisons.)There is a lot of bipolar, but even analog CMOS layout makes use of parasitic bipolar junction tranistors and parasitic field FETs that all high voltage analog mask designers need to deal with.Yes, it is arguably lite on ESD, and, as an experienced analog chip designer, I was sad that I could not find mention that CMOS FET and poly resistor matching is generally scaled by the square root of the area, and alot more engineering level detail could be included in that section.Still, this book is the best for analog layout techniques. ... Read more

Subjects:  1. Design and construction    2. Electronics - Circuits - Integrated    3. Electronics - General    4. Engineering - Electrical & Electronic    5. Integrated Circuits    6. Layout (Printing)    7. Science/Mathematics    8. Technology    9. Technology & Industrial Arts    10. Circuits & components    11. Technology / Electronics / General   

Reviews (53)

Good book
As I was told by my instructor about this book, and it is true, this is a very good book about DSP.I actually bought a lot of DSP books before, but this one is the best, I strongly recommend it.

The book is fantastic
I wish I had this book when I took my discrete systems class in college.Maybe then I would have understood what the professor was trying, but failed, to teach us.Thanks to Lyon's book, I now am beginning to understand how to use the FFT to actually analyze a real signal.I understood FIR filters pretty well but the book's helping me a lot to understand how to use the Z transform to analyze IIR filters.The book doesn't just give you the equations, he explains what they mean and that's what I like about the book.I am even beginning to grasp some of the DSP Tricks in Chapter 13.I highly recommend this book to anyone trying to learn digital signal processing.

needs problems to be a useful textbook
Lyons presents a solid treatment of DSP, from first principles. Many important concepts are clearly explained, like IIR and FIR filters. Plus transforms like Hilbert. And the many moves back and forth between the time and frequency domains. You need to get comfortable with these ideas, and the text does not skimp on offering comprehensive details.
Read more

Subjects:  1. Digital Communication Engineering    2. Digital techniques    3. Engineering - Electrical & Electronic    4. Science/Mathematics    5. Signal Processing (Communication Engineering)    6. Signal processing    7. Technology    8. Technology & Industrial Arts    9. Telecommunications    10. Communications engineering / telecommunications    11. Technology / Engineering / Electrical