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ET 101: National Rules for Electrical Installations
These Rules lay down the requirements for the design and erection of electrical installations so as to ensure safety and proper functioning for the use intended.

These Rules apply to electrical installations such as those of: - residential premises - commercial premises - public premises - industrial premises - agricultural and horticultural premises - prefabricated buildings - caravans and caravan sites and similar sites - construction sites, exhibitions, fairs and other temporary installations (future) - docks and marinas (future)

These Rules apply to the following: - circuits supplied at nominal voltages up to and including 1000V a.c. or 1500 V d.c. - circuits, other than the internal wiring of apparatus, operating at voltages exceeding 1000 V and derived from an installation having a voltage not exceeding 100 V a.c., e.g., discharge lighting, electrostatic precipitators - any wiring for telecommunication, signalling, control and the like (excluding internal wiring of apparatus)

These rules do not apply to: - electrical traction equipment - electrical equipment of automobiles - electrical equipment on board ships - electrical equipment in aircraft - installations in mines and quarries - radio interference suppression equipment, except in so far as it affects the safety of the installation - systems for distribution of energy to the public, or power generation and transmission for such systems - lighting protection of buildings

Note: Atmospheric phenomena are covered, in so far as effects on the electrical installations are concerned (e.g. with respect to selection of lighting arresters).

ET 105: National Rules for Electrical Installations in Potentially Explosive Atmospheres
These Rules apply to the design of electrical installations, the selection of apparatus and the installation of apparatus and conductors (live, protective and bonding), and the inspection and testing of these installations in areas where potentially explosive atmospheres may exist due to flammable gases, vapours, mists, fibres or dusts.
These Rules shall be observed in addition to the National Rules for Electrical Installations, Third Edition, ET101:2000. They apply to all electrical installations in potentially explosive atmospheres whether permanent, temporary or transportable. They apply to installations at Low Voltage and Extra Low Voltage.

These Rules do not apply to the following:
- electrical installations in mines susceptible to firedamp;
- inherently explosive situations, for example explosives manufacturing and processing;
- rooms used for medical purposes;
- installations such as those found in railway trains, aircraft, road transport vehicles, boats or ships;
- domestic installations;
- normal use of appliances burning gaseous fuels as defined in Directive 90/396/EEC.

ET 106: National Rules for Electrical Installations in Medically Used Rooms
These Rules specify the minimum requirements for the design and construction of electrical installations in medical diagnostic and treatment area, including dental and veterinary, of public and private establishments where medical electrical equipment is used, so as to maximise the safety of patients, medical personnel and the environment.

The Rules apply to electrical installations in Medically Used Rooms where Body-type procedures and Cardiac-type procedures are undertaken.

These Rules apply to installations supplied at low-voltage, that is, up to 1000 V a.c. (r.m.s.).

These Rules do not apply to reticulated supplies of low-voltage d.c. nor to safety extra-low voltage.

ET 107: National Rules for Inspection and Certification of Existing Electrical Installations for Reconnection to the Distribution System.
These Rules are intended for the following purposes:
- As a means for inspecting and testing an existing installation in order to identify danger, damage and defects in an existing installation.
- To specify the necessary remedial measures that must be taken to ensure an acceptable level of protection against electric shock and burns and against fire or excessive heat that could be caused by a defect in the installation.
These Rules apply to existing installations in domestic and small commercial premises where the Distribution System Operator (DSO) requires certification of an installation before reconnecting the supply. It does not apply to new installations, which must comply with the current National Rules for Electrical Installations (ET101 Current Edition).

ET 201: Code of Practice for the Design, Selection and Erection of Low Voltage Switchgear Assemblies
This Code of Practice applies to assemblies of low-voltage switchgear and control gear having rated voltage not exceeding 1000 V a.c. and 1200 d.c. and a rated current greater than 100 A. Two categories of assemblies are recognised:

a. "Factory-built assemblies" (FBA's) manufactured in accordance with IEC Publication 439, and tested by an independent authority. b. "Custom-built assemblies", which include, in general, assemblies not tested by an independent authority, or not built to a certified design.

This Code of Practice is intended to give guidance on the design and selection of switchgear assemblies for Irish conditions. Special attention is given to custom-built assemblies manufactured locally which are not tested for short circuit strength by a recognised test house.

This code does not apply to equipment intended for use in hazardous atmospheres, where special equipment must be used. (See "Guide to the Selection of Electrical Equipment for use in Potentially Explosive Atmospheres", published by the Electro-Technical Council of Ireland).

ET 202 Guide to the Selection of Electrical Apparatus for use in Potentially Explosive Atmospheres
This guide deals with electrical apparatus for use in areas where there is a risk of explosion due to the presence or possible presence of flammable gas, vapour or dust.
It is intended as a Guide to the National Rules for Electrical Installations in Potentially Explosive Atmospheres, ET105:2001 and it gives the technical criteria that must be taken into account when selecting the apparatus.

ET 204: Code of Practice for Control Systems involving Programmable Electronic Products & Systems
This Code of Practice applies to Control Systems involving programmable electronic equipment. It does not cover the use of programmable electronic systems (PES) for specific safety related applications, where the safety integrity of the plant is to be assured by the PES. E.g. burner system, High Tension Switching/Interlock Systems.

This Code of Practice is intended to give guidance on the design, programming, installation, commissioning and maintenance of Control Systems involving Programmable Electronic Systems for the automation of machines or processes. It is intended to cover the interaction of hardware and software in order to ensure the correct and safe operation of the system as a whole.

ET 205: Guide to the Installation of Extra-Low Voltage Lighting Systems
Extra-low voltage (ELV) lighting causes problems that are not normally found in low voltage (230V) installations. Whilst the risk of electric shock is virtually non-existent, there is a substantial fire risk due to high temperatures that can be caused by the high current values produced by ELV.

This Guide is mainly concerned with the means for preventing fires that may be caused by incorrect installation or misuse of ELV equipment for lighting.

The Guide applies to ELV lighting installations supplied from sources with a maximum rated voltage of 50V a.c. In practice the voltages are usually 12V a.c. (d.c is not normally used in ELV installations).

ET 206: Good Practice Guide on the Management of Electrical Safety at Work.
This Good Practice Guide is targeted primarily at the Employer and the Line Manager responsible for safety, health and welfare at work. The Guide is intended as a working handbook for such persons to show the scope of their responsibilities for enforcing safe practices in the management of electricity in the workplace. The Guide also includes a compendium of appendices which spell out "good practice" guidelines for the "authorised person" responsible for electrical safety.

ET206A: Procedural Guidelines for Working on Electrical Installations.
This publication is available free of charge from ETCI Offices as an A3 wall chart. It can be downed by clicking here and included in your organisation's safety file. The chart is an extract from the ETCI Good Practice Guide on the Management of Electrical Safety at Work and is intended to assist the electrical expert in drawing up a job description to safely carry out live or dead working on an electrical installation or electrical apparatus in accordance with the Safety, Health and Welfare at Work (General Application Regulations) 1993, S.I. 44, 1993 (Part VIII - Electricity).

ET 207: Guide to the National Rules for Electrical Installations As Applicable To Domestic & Similar Installations.
This Guide deals with domestic and similar electrical installations e.g. small commercial types with a supply rating not exceeding 120A. It covers small shops and small commercial premises. It does not cover larger commercial premises, laboratories, workshops or other locations where specialized activities are undertaken (except for "hobby" workshops) or the main services to apartments or office blocks. The Guide describes acceptable methods of compliance with the Rules for domestic and similar installations, with illustrations and examples. Domestic and small commercial installations are deemed to be those metered using a "whole current" metering system and normally do not include installation methods using current transformers. However, this Guide may also be suitable for such installations.
The National Rules for Electrical Installations, ET101, deal only with new installations, which may be complete installations or extensions or alterations to part of an installation.

ET 208: Code of Practice for the Design, Selection and Erection of LV Swithchboards for Residential Applications.
The scope of this Code of Practice applies to low voltage switchgear assemblies having a rated voltage not exceeding 300v a.c.(Phase to Neutral) and a rated current less than or equal to 250 amps with outgoing circuits not exceeding 125 amps. These are for use in residential type applications. Small commercial type applications may be considered to be within this scope. The Irish Standard I.S. EN60439-3 covers equipment for such applications, however this Code of Practice deals with additional aspects not specifically dealt with within the standard.

ET 209: A Recommended Maintenance & Inspection Routine for Electrical Installations in Potentially Explosive Atmospheres
Electrical installations in hazardous areas possess features specially designed to render them suitable for operations in such atmospheres. It is essential for reasons of safety in those areas that, throughout the life of such installations, the integrity of those special features is preserved. They therefore require initial inspection and verification followed by periodic inspections thereafter. This routine is intended for the inspection and maintenance of electrical installations within hazardous areas only. It does not include conventional requirements for electrical installations, nor testing and certification of electrical apparatus. It is not intended to be applied to installations in mines. This document should be read in conjunction with ET101, ET105 and ET202.

ET 210: Code of Practice for the Installation of Low Voltage Generators
This Code of Practice gives details for the installation of low voltage generator sets which include protection for safety, earthing and bonding, operation, maintenance and verification. It includes typical diagrams of connections for portable, embedded, synchronous and asynchronous and mobile low voltage generators. This Code of Practice must be read in conjunction with the National Rules for Electrical Installations, Third Edition ET101:2002 (incorporating Amendment No.1 2001).

ET 211: Code of Practice for Public Lighting Installations in Residential Areas
This Code of Practice applies to the installation of electrical equipment for public lighting installations in residential areas and their connection to the electrical supply. It does not apply to other forms of public lighting installations such as those designed for highways and motorways. It is based on Section 714 of the National Rules for Electrical Installations, ET101 and should be read in conjunction with it. It gives the details for public lighting installations in residential areas - for example it deals with supply connections, cable types, sizes and installation methods.

ET 212: Guidelines for Extensions, Additions and Alterations to Existing Electrical Installations
New electrical installations must comply with the current National Rules for Electrical Installations. These Rules also cover "the extension or alteration of an installation and parts of the existing installation affected by the extension or alteration" (Rule 11.2). An extension, addition or alteration must not impair the safety of an existing installation, and the existing installation must not impair the safety of the new work. These Guidelines are intended to explain the procedures that should be followed by the installer in the case of extensions, additions and alterations.

ET 214: Guide to the Selection and Use of Residual Current Devices.
This Guide is intended to provide specifiers, installers and users of RCDs with a better understanding of the application, selection and use of such products. This publication is intended for use as a guide only, and has no regulatory or statutory status and should therefore be used in conjunction with the current issue of the National Rules for Electrical Installations (ET101), relevant product standards, and I.S. EN60439 - Low Voltage Switchgear and Control Gear Assemblies, where applicable. The Guide is limited to RCDs intended for domestic and similar use, having a rated voltage not exceeding 400V AC and a rated current not exceeding 125A.

 

 


 
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