practical electrical wiring standards - as 3000:2007

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Practical Electrical Wiring Standards- AS 3000:2007


What is in the course?• Course contents• Background and importance of the standards and

regulations• AS/NZS 3000 preface• Objectives of AS/NZS 3000• Contents of AS/NZS 3000 and main features


Total workshop outline• Fundamentals of electrical distribution systems

• Common risks and hazards associated with Electricity use

• Safety norms and considerations to prevent and avoid such common hazards

• Basic requirements of AS/NZS:3000-2007 Wiring Rules

• Contents and stipulations of AS/NZS 3000 to ensure safe and reliable electrical installations

• Simple procedures / calculations as per AS/NZS 3000 related to main and earthing conductor sizes, maximum demand, voltage drops, etc.

• Mandatory checks and tests on an installation prior to energisation as per the standard.


Need for the regulations• Homogeneous regulations ensure availability of consumer items

and their easy replacements or interchanges as and when needed, with minimum constraints.

• Helps in selection of correct and matching devices satisfying the expected performance needs.

• Ensure consistent quality and performance reliability for the equipments and installations.


Main objective of AS/NZS 3000• To define minimum requirements to be

followed for the design, construction and testing of electrical equipment and installation in a safe manner so as to protect persons, livestock and property from electric shock, fire and physical injury hazards that may arise from the installation.

• Above objective is valid for new installations as well as for modifications/ additions to the existing ones


How AS/NZS 3000 ensures safety?

By providing:• Stipulations and practices to be followed for protection against risks

and consequent hazards

• Requirements to be met by the system, equipments, accessories and installation to meet these stipulations and practices

• Mandatory verification and testing to ensure installation and equipments comply with the stipulated safety norms


Application areas• Electrical installations in all types of premises and land used by

electricity consumers.

• Reference for requirements relating to electrical installations in matters such as

– Safety of workplaces. (Occupational Health and Safety legislation and associated codes).

– Safe design/construction of buildings (like Building Code of Australia, New Zealand Building Code)

– Electricity generation, T & D systems.

– Safe connection to electricity distribution systems.

– Qualifications of electricity workers.


AS3000:2007 edition• Approved on behalf of the Council of Standards Australia and

New Zealand and published on 12th November 2007.

• Increased illustration diagrams on concepts and stipulations including additional practical examples based on feedback from 2000 edition users.

• Two parts with Part 1 (Section 1) covering Scope, application and fundamental principles and is generally complete in itself to avoid cross-referencing to Part 2 (Sections 2-8).

• Establish the ‘deemed to comply’ status of AS/NZS 3018 relating to simple domestic applications


Some Important Changes• Illustration of normal and alternative location of over current devices

and its omission as well.

• Single main switch (per tariff) for a single domestic installation.

• Arc fault protection MUST for all switchboards with a nominal supply rated above 800 A

• Use of residual current devices (RCDs) to all socket outlet and lighting circuits up to 20 A

• Maximum three circuits connected to any one RCD.

• Voltage drop of up to 7% where a substation is located within the premises.

• Inclusion of additional appendices


AS3000:2007 contents• Part-1 aligned with IEC 60364 for essential safety.

• Part-2 (Sections 2 to 8) stipulates practices to be followed in the systems to achieve safety

• Failure to comply with a work method provision in Part 2 would breach high level safety conditions of Part 1

• Alternative mechanism to Part-2 stipulations is acceptable subject to satisfying the objectives of Part -1.

• Testing and inspection provisions updated and aligned with AS/NZS 3017, including provisions for periodic inspection in accordance with AS/NZS 3019.


Section 1: Scope, application and fundamental principles

• Definitions for various electrical terms

• Protection requirements to minimize hazards

• Principles of protection

• Basic requirements for design and installation of electrical systems

• Requirements for new installations

• Requirements for additions and modifications to an existing installation


Section 2 – General arrangement, control and protection

• Switchgear and controlgear arrangements for protection against hazards.

• Control of the electrical installation (or parts thereof) by suitable switching arrangements.

• Protection against fault conditions.

• Coordination of protective devices

• Design, selection and installation of switch boards.


Section 3 – Selection and installation of wiring system

• Protection against external influences and environmental conditions

• Steps to avoid mutual detrimental influences among multiple conductors

• Requirements to meet current-carrying capacity, voltage drop, etc

• Practices for connections, joints and terminations to improve reliability

• Identification for safety and maintenance

• Fire protective measures


Section 4 – Selection and Installation of appliances and accessories

• Installation requirements of motors, transformers, Capacitors, heating systems, lighting systems, UPS and standby sources, etc. to ensure

– protection against physical injury.

– protection from thermal effects.

– Safe and reliable circuit connection

– proper isolation and switching under abnormal conditions

– Protective devices and their features


Section 5 – Earthing arrangements & earthing conductors

• Protective and functional earthing

• Recommended earthing resistance values

• Mechanical protection appropriate to the assessed conditions of external influence

• Sizing and selection of earthing electrodes and conductors.


Section 6 – Damp situations

• Safety concerns in damp areas

• Area classifications in bath rooms, showers, pools, fountains, saunas, etc based on level of safety needed.

• Selection and Installation practices for Electrical equipment in classified areas to achieve the desired level of safety


Section 7 – Special Electrical installations

• Safety services

• Electricity generation systems.

• Electrical separation systems.

• Extra-low voltage electrical installations.

• High voltage electrical installations.

• Explosive / Hazardous areas.

• Miscellaneous installations like Construction/ demolition sites, medical treatment areas, cranes/hoists, lifts, generating sets, carnivals, telecom network power supplies, etc


Section 8 – Verification

• Minimum inspection and test procedures to check compliance of an installation to AS/NZS 3000 wiring rules before putting into service covering

– Inspection checklists.

– Mandatory tests

– Sequence of tests before/ after energisation

– Recommended results for acceptance


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practical electrical wiring standards - as 3000:2007

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