Practical Electrical Equipment and Installations in Hazardous Areas

Front Cover
This book provides the reader with an understanding of the hazards involved in using electrical equipment in Potentially Explosive Atmospheres. It is based on the newly adopted international IEC79 Series of Standards that are now harmonizing and replacing older national Standards. Explosion-proof installations can be expensive to design, install and operate. The strategies and techniques described in this book can significantly reduce costs whilst maintaining plant safety. The book explains the associated terminology and its correct use - from Area Classification through to the selection of explosion-protected electrical apparatus, describing how protection is achieved and maintained in line with these international requirements. The IEC standards require that engineering staff and their management are trained effectively and safely in Hazardous Areas, and this book is designed to help fulfill that need. A basic understanding of instrumentation and electrical theory would be of benefit to the reader, but no previous knowledge of hazardous area installation is required.

* An engineer's guide to the hazards and best practice for using electrical equipment in Potentially Explosive Atmospheres.
* Fully in line with the newly adopted international standards, the IEC79 series.
* Clear explanations of terminology and background information make this the most accessible book on this subject.

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1 Introduction
2 Electrical energy ignition and flammability
3 Area classification
4 Design philosophy and selection of equipmentapparatus
5 Protection concept d
6 Protection concept e
7 Protection concept n
8 Protection concept i principles
16 ATEX Directive
IEC series standard titles for explosive atmospheres
Listing of IS standards and codes of practice by country
IEC 7917 Ex i inspection schedule
CENELEC members
IP code
Standards reference
Familiarization with electricity

9 Protection concept p
10 Other concepts
11 Earthing and bonding
12 Installations
13 Inspection and maintenance
14 Safe working practices
15 Faultfinding and testing
ATEX Directive
Properties of combustible compounds
Important changes to ASNZS 23811
Practical exercises for hazardous area course

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Page 15 - At first the valve is closed and all the water is in tank A. Thus, the water pressure across the valve is at maximum. When the valve is opened, the water flows through the pipe from A to B until the water level becomes the same in both tanks. The water then stops flowing in the pipe, because there is no longer a difference in water pressure between the two tanks.
Page 7 - Regulation 27. All conductors and apparatus exposed to the weather, wet, corrosion, inflammable surroundings or explosive atmosphere, or used in any process or for any special purpose other than for lighting or power, shall be so constructed or protected, and such special precautions shall be taken as may he necessary adequately to prevent danger in view of such exposure or use.
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Page 34 - In which an explosive gas-air mixture is not likely to occur in normal operation, and if it occurs it will exist only for a short time.
Page 15 - Difference in potential. When a difference in potential exists between two charged bodies that are connected by a conductor, electrons will flow along the conductor. This flow is from the negatively charged body to the positively charged body until the two charges are equalized and the potential difference no longer exists. An analogy of this action is shown in the two water tanks connected by a pipe and valve in figure 2-19.