practical electrical wiring standards - as 3000:2007
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Practical Electrical Wiring Standards- AS 3000:2007
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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
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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.
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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.
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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
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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
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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.
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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
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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
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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.
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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
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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.
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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
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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
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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.
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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
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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
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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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DO YOU WANT TO KNOW MORE?
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