Practical Electrical Wiring Standards - National Rules for Electrical Installations - ET 101:2008

Practical Electrical Wiring Standards –
National Rules for Electrical Installations –
ET 101:2008
Technology www.idc-online.com/slideshare TTeecchhnnoollooggyy TTTrrraaaiiinnniiinnnggg ttthhhaaattt WWwooorrrkkksss

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

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

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

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

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

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

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

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

General Application Regulations of 1993
• Part I Interpretation and General
• Part II General Safety and Health Provisions
• Part III Workplace
• Part IV Use of Work Equipment
• Part V Provision of Personal Protective Equipment
• Part VI Manual Handling of Loads
• Part VII Work with Display Screen Equipment
• Part VIII Electricity
• Part IX First Aid
• Part X Notification of Accidents and Dangerous
Occurrences

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

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

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

Organization of ET 101
Part 1: Scope, Object and Fundamental Principles
Part 3: Part 4: Part 5: Part 6: Part 7:
Assessment of
Protection
Selection and
Inspection
General
for Safety
Erection of
and
Characteristics
Equipment
Testing
Special
installations
or locations
Part 2: Definitions

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)

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

DO YOU WANT TO KNOW MORE?
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please visit:
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Practical Electrical Wiring Standards - National Rules for Electrical Installations - ET 101:2008

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