practical electrical wiring standards - national rules for electrical installations - et 101:2008
DESCRIPTION
Internationally there has been steady progress towards the harmonisation of electrical wiring standards. European standards are based on the international IEC 364 under the umbrella of Harmonisation Document HD 384. The format of these is reflected in the ETCI national rules ET 101: 2008 and the UK IEE wiring regulations BS 7671:2008. This workshop is designed to provide up to date information and training on the current edition of National Rules ET 101: 2008. It will consist of in-depth teaching on all aspects of the national rules and their application with many practical examples and sample design calculations. The workshop includes references to safety, maintenance, inspection and testing. In addition, it provides a summary of some of the basic principles necessary for a good understanding of electrical installation technology. MORE INFORMATION: http://www.idc-online.com/content/practical-electrical-wiring-standards-national-rules-electrical-installations-et-1012008-2TRANSCRIPT
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Practical Electrical Wiring Standards – National Rules for Electrical Installations –
ET 101:2008
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Course Contents
• Overview of the Rules• Evolution of electrical distribution systems• System earthing and protective earthing basics• Planning of electrical systems• Electrical safety• Selection and erection of electrical equipment• Installations in special locations• Inspection and testing of installations
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Need for Standards
To ensure proper interfacing between equipment and systems designed/ manufactured/installed by different agencies. Standards contain stipulations on:
• Sockets, connectors and other connection interfaces used in equipment's to ensure proper matching
• Voltage and Frequency parameters and permissible variations
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Need for Standards
To ensure manufacturing/Installation quality by defining :
• Functionality
• Safety
• Maintainability
• Ratings and applicable conditions
• Tests to be done to verify the above
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Installations Covered
The Rules cover installations in:
Industrial, commercial, residential, agricultural/horticultural premises
Prefabricated buildings and caravans
Temporary installations such as those encountered in construction sites, exhibitions, fairs etc.
Outdoor installations
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Scope of the Rules
The Rules cover the following:
Circuits supplied at nominal voltage up to and including 1000 V AC or 1500 V DC
Circuits of over 1000 V AC when derived from an installation of less than 1000 V AC
Wiring and cabling systems
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Scope of the Rules
All consumer installations external to the building
All fixed and External wiring requirements for communication and information technology systems
Additions and alterations to existing installations
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Exclusions
The Rules exclude: Public or private supply systems for the distribution of
electricity to consumers Railway traction, rolling stock and signaling systems Motor vehicles and equipment on board ships, off shore
installations and aircraft Mines and Quarry equipment covered by other
statutory regulations Lightning protection installations on buildings
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Legal Framework
• All work activity is governed in law by The Safety Health and Welfare Act 1989
• Specific requirements under General Application Regulations of 1993 (Next slide)
• Part VIII of the Regulations deals with Electricity
• ETCI National Rules elaborate the requirements for complying with the Regulations
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General Application Regulations of 1993
• Part I Interpretation and General• Part II General Safety and Health Provisions• Part III Workplace• Part IVUse of Work Equipment• Part V Provision of Personal Protective Equipment• Part VIManual Handling of Loads• Part VII Work with Display Screen Equipment• Part VIII Electricity• Part IXFirst Aid• Part X Notification of Accidents and Dangerous
Occurrences
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Important Regulations in Part VIII
• Reg. 35: Duty of Employers to comply with Part VIII and any relevant code of practice
• Reg. 36: Prevention of danger in electrical installations
• Reg. 41: RCD protection for portable equipment and socket outlets
• Reg. 45: Precautions against danger arising from electrical equipment,
• Reg. 46: Work activity on or near any live part • Reg. 48: Persons to be competent to prevent
danger
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Fundamental Principles• Ensuring safety against direct and indirect shocks, thermal effects,
over current, fault current and over voltage
• Aspects that need to be considered in the design
• Selection of electrical equipment in order to suit the supply parameters
• Erection of equipment so as to ensure safety in operation and maintenance
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Contents of ET-101
Part 1: Scope, Object and Fundamental Principles
Part 2: Definitions
Part 3: Assessment of General characteristics
Part 4: Protection for Safety
Part 5: Selection and Erection of Equipment
Part 6: Inspection and Testing
Part 7: Special installations or locations
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Organization of ET 101
Part 3: Part 4: Part 5: Part 6: Part 7:
Assessment of General
Characteristics
Protection for Safety
Selection and Erection of Equipment
Inspection and
Testing
Special installations or locations
Part 1: Scope, Object and Fundamental Principles
Part 2: Definitions
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Other relevant materials
• There are Annexes to ET 101 Rules• Annex names include the chapter numbers of the Rules to
which they pertain• There are also other related National Rules (Ex: ET 105
and ET 106) applicable for specific installations• ET Codes of practices and guides also provide useful
guidelines– (For details refer to manual)
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Harmonised Standard
A Harmonised Standard is one which has been drawn up by common agreement between national standards bodies notified to the European Commission by all member states and published under national procedures
– ET 101 Rules are based on IEC 60364 and Cenelec 60364.
– There is no intention at this time of harmonising Cenelec 60364
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