Wiring Rules Information Seminar

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Wiring Rules Information Seminar
AS/NZS 30002007
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WHATS NEW

• A survey found industry wanted a document that
• Is more suited to the present regulatory
  structure
• Is more logical and easier to understand
• Reinstates much of the guidance information that
  was removed from the 2000 edition
• Has more examples.

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WHATS NEW

• Standard is in 2 parts bound as 1 document
• Part 1
• provides uniform essential elements that
  constitute minimum regulatory requirements
• Part 2
• provides installation practices that achieve
  certainty of compliance with Part 1.

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WHATS NEW

• Preface contains details of 56 additions and
  alterations included in the new Standard.
• These include
• extended application of safety switches
• protection against arcing faults
• requirements for discrimination between circuits
• installation couplers recognised as a suitable
  means of connection
• (continued)

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WHATS NEW

• strengthening requirements for the prevention of
  the spread of fire
• enhanced requirements for recessed luminaires
• requirements for sanitisation areas in the food
  processing industry
• mandatory testing of safety switches for correct
  operation
• additional appendices, improved index, more
  logical layout, further illustrations and
  background information.

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PART 1DEFINITIONS

• Revised definition
• Clause 1.4.82 Safety service
• A system or component that operates to identify
  an emergency, or is intended to operate during an
  emergency, and is primarily associated with
• (a) the safety of persons evacuating a building
  or
• (b) fire-fighting operations or
• (c) fire suppression.
• Called emergency systems or essential
  equipment in previous editions.

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PART 1DEFINITIONS

• New definition
• Clause 1.4.69 Outbuilding
• A structure completely separated by an area of
  land from another structure containing the
  switchboard from which supply is obtained.
• See Clause 5.5.3.3 Earthing of outbuildings.

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PART 1SCOPE, APPLICATION AND FUNDAMENTAL
PRINCIPLES

• Part 1 (Section 1) provides a mechanism for
  acceptance of design practices that may not be
  addressed in Part 2.
• This mechanism is only intended to apply where
  departures from the methods in Part 2 are
  significant.
• However, a degree of flexibility exists within
  Part 2.

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PART 1

• Clause 1.9.4 Compliance by specific design and
  installation.
• Certain installations or portions of
  installations that may have unusual requirements,
  applications or intended use, that cannot meet
  Part 2 may use a specific design and installation
  method.

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PART 1

• Such installations may be deemed suitable
  provided that they
• satisfy the fundamental safety principles of Part
  1
• result in a degree of safety not less than that
  which would be achieved by compliance with the
  particular requirements of this Standard and
• satisfy the other requirements of this Standard
  as detailed in this Clause.
• The remaining portions of such installations
  shall comply with Part 2.

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PART 1

• If all or part of the design/construction is not
  based on Part 2, this choice must be made by the
  designer prior to final certification of
  construction by the person carrying out the
  construction.
• Any departures from Part 2 must be formally
  acknowledged by the installation owner or
  operator.
• The designer shall document the Part 1 design.

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PART 1

• Documentation must
• be in English
• state why Part 2 was not used
• list the verification requirements that are
  required to ensure compliance
• state how compliance with Part 1 is achieved
• contain the owner/operators acknowledgement as
  to the departures from Part 2

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PART 1

• List any requirements where the design requires
  specific use
• List the verification undertaken to ensure
  compliance and include the results of this
  verification.
• Be retained by the designer and also on site by
  the person with overall responsibility for the
  installation.

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PART 2 GENERAL

• Part 2 provides installation practices that
  achieve compliance with Part 1.
• It generally retains the structure of AS/NZS
  30002000.
• It restores information from AS 30001991.
• Emphasis placed on common, practicable and
  cost-effective methods.

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PART 2 SECTION 2GENERAL ARRANGEMENT, CONTROL
AND PROTECTION

• Clause 2.2.1.2 Common neutral
• A common neutral conductor may be used for two
  or more circuits subject to the following
  conditions
• The continuity of the common neutral shall not
  depend on connections at the terminals of
  electrical equipment, including control switches.
• The circuits shall be controlled and protected by
  linked circuit breakers.
• The neutral shall be marked at the switchboard to
  identify the associated active conductors. (Cl.
  2.9.9.5)

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SECTION 2

• Clause 2.3.3.2 Number of main switches
• The number of main switches should be kept to
  the minimum practicable to provide effective
  operation in an emergency.
• Domestic installations
• One switch per separately metered supply
• Where there is more than one separately
  controlled supply from a meter, a main switch is
  required for each supply.

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SECTION 2

• Clause 2.5.1.1 requires overcurrent protection
  of the consumers mains in accordance with one of
  the following
• short circuit and overload protection at the
  origin (point of supply)
• short circuit at the origin and overload
  protection at the main switchboard
• short circuit protection not required where
  overload protection is provided at main swb. and
  mains are constructed and installed to Clause
  3.9.7.1.2. (unprotected U/G tee-off arrangement)

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SECTION 2

• Clause 2.5.1.1 (continued)
• Note
• Distributors Service fuse will provide short
  circuit protection. (Requirement of the Qld
  Electrical Safety Act Regulation 2002)
• Distributors circuit breaker may provide both
  short circuit and overload protection.

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SECTION 2

• Clause 2.5.1.1 (continued)
• Note
• Consumers mains supplying circuits that are
  individually protected against overload are
  deemed to have overload protection where the sum
  of the circuit breaker ratings does not exceed
  the current carrying capacity of the consumers
  mains.
• Eg. Simple domestic installation with gas range
  and water heater comprising of 2 20A power
  circuits and 2 10A lighting circuits and 63A
  consumers mains will comply with the above.

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SECTION 2

• Clause 2.5.5.1 Protection against switchboard
  internal arcing fault currents
• Protection against arcing faults while equipment
  is in service, or is undergoing maintenance,
  shall be provided for heavy current switchboards.
  (ie. switchboards gt800A per phase).
• The supply conductors up to the line side of the
  protective devices shall be provided with means
  to reduce initiation of arcing faults by
  insulation or by separation.

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SECTION 2

• Clause 2.5.5.2
• Heavy current switchboards shall be provided with
  internal separation in accordance with AS/NZS
  3439.1.
• Note
• Arc fault containment is not required and is
  considered to be an enhancement of internal
  separation.
• See Clause 7.2.8 for switchboards supplying
  Safety Services.

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SECTION 2

• Clause 2.5.5.3
• Protective devices shall be provided to limit, as
  far as practicable, the harmful effects of a
  switchboard internal arcing fault by automatic
  disconnection.
• Note
• Switchboards complying with AS/NZS 3439.1
• Forms 3b 4bh should meet these requirements.

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SECTION 2

• Clause 2.5.7.1 Reliability of supply
• The electrical installation shall be designed to
  provide a reliable supply by dividing the
  electrical installation into appropriate circuits
  and selecting protective devices with appropriate
  discrimination so that in the event of a fault
  occurring, the loss of supply resulting from
  operation of a protective device is minimized.
• The selection and setting of the protective
  devices shall be verified by inspection.

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SECTION 2

• Clause 2.5.7.2 Coordination of protective
  devices
• Coordination of various protective devices
  requires consideration of both discrimination and
  backup (cascading) protection.
• Clause 2.5.7.2.3 General supply circuit
  discrimination
• In accordance with Clause 2.5.7.1, to minimize
  loss of supply, discrimination shall be arranged
  between protective devices for outgoing circuits
  and the upstream protective device.
• Downstream devices shall be selected to
  discriminate with upstream devices, using
  time-current curves.

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SECTION 2
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SECTION 2

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SECTION 2

• Clause 2.6.1 RCD protection - General
• The use of fixed setting RCDs with a rated
  operating residual current not exceeding 30mA, is
  recognized as providing additional protection in
  areas where excessive earth leakage current in
  the event of failure of other measures of
  protection or carelessness by users could present
  a significant risk of electric shock.

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SECTION 2

• Clause 2.6.2.3 Protection against initiation of
  fire
• Although not a mandatory requirement of this
  Standard, to provide additional protection
  against the initiation of fire caused by leakage
  current across insulation, a Type S RCD with a
  rated residual current in the range of 100 mA to
  300 mA may be used as a main switch in a domestic
  installation.

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SECTION 2

• Clause 2.6.2.4 Arrangement
• Where RCDs are required in accordance with
  Clause 2.6.3 the circuits shall be arranged as
  follows
• (a) Not more than 3 final subcircuits shall be
  protected by any one RCD and
• (b) Where
• (i) the number of RCDs exceeds 1 and
• (ii) more than 1 lighting circuit is installed
• lighting circuits shall be distributed between
  RCDs.
• (c) In domestic installations having more than 1
  final subcircuit, a minimum of 2 RCDs shall be
  installed.

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SECTION 2

• Clause 2.6.3.1 Residential electrical
  installations
• RCDs are required for socket outlets and
  lighting circuits in residential electrical
  installations. And also for
• (c) directly connected hand-held (Cl.1.4.8)
  electrical equipment, eg directly connected hair
  dryers or tools
• forming part of
• (i) individual domestic installations or
• (ii) residential areas of other electrical
  installations (motels, hospitals etc) or
• (iii) multiple residential electrical
  installations that are provided for common use

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SECTION 2

• Clause 2.6.3.1 (continued)
• Exceptions
• Sockets outlets located in a home dialysis
  installation shall be protected in accordance
  with Clause 2.6.3.3.
• Clause 2.6.3.3 Home dialysis installations
• In accordance with AS/NZS 3003 medical equipment
  used in home dialysis installations shall be
• (a) supplied by a dedicated circuit and
• (b) protected by a 10mA RCD positioned so that
  it may be reset by the patient while under
  treatment.

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SECTION 2

• Clause 2.6.3.2 Other electrical installations
• Additional protection by 30mA RCDs shall be
  provided for final subcircuits supplying
• (a) socket outlets having a rated current not
  exceeding 20A and
• (b) one or more lighting points and having a
  rated current not exceeding 20A and
• (c) directly connected hand-held electrical
  equipment.

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SECTION 2

• Clause 2.6.3.2 (continued)
• Note The final subcircuits referred to in Item
  (b) include, without limitation, those supplying
  the following
• (a) External lighting installations, such as
  bollard-type luminaires and
• (b) Illuminated signs and
• (c) Ground mounted lighting for the illumination
  of public features.
• Exception Where disconnection could cause a
  dangerous situation. E.g. Traffic lights.

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SECTION 2

• Clause 2.6.3.4 Alterations, additions and
  repairs
• Socket outlets added to an existing circuit
  shall be protected by an RCD.
• Exception
• (a) Where socket outlets or lighting points are
  not RCD protected are replaced, including the
  replacement of a single outlet with a multiple.
• (b) Extensions to circuits supplying lighting
  points only, provided the existing circuit is not
  RCD protected.

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SECTION 2Clause 2.9.2.5 (k)
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PART 2 SECTION 3SELECTION AND INSTALLATION OF
WIRING SYSTEMS

• Clause 3.5.2(b)(ii) Neutral conductor Multiple
  phase
• The current carrying capacity of the neutral
  conductor of multiphase consumers mains, submains
  or final subcircuit shall be not less than that
  of the current carrying capacity of the largest
  associated active conductor.
• Exception 2
• Current carrying capacity of the neutral can be
  lower if detection device fitted.

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SECTION 3

• Clause 3.6.2 Voltage drop
• Voltage drop remains at 5 with several
  exceptions. The most common exception is shown
  below.
• Exceptions
• 3. Where the point of supply is the low voltage
  terminals of a substation located on the
  premises containing the electrical installation
  and dedicated to the installation, the
  permissible voltage drop may be increased to 7.

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SECTION 3

• Clause 3.9.3.2 Suspended ceilings
• Wiring systems may be supported by the suspended
  ceiling system unless this is not permitted by
  the suspended ceiling manufacturer and
• Cables shall be provided with additional
  protection against mechanical injury where in
  contact with conductive ceiling support runners
  (Cl. 3.3.2.6) and
• Wiring systems installed above suspended ceilings
  shall be fixed at suitable intervals to prevent
  undue sagging of cables.
• Note 2 National Building Codes may restrict use
  of suspended ceilings to support services.

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SECTION 3
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SECTION 3

• Clause 3.11.4.4 TABLE 3.6 U/G wiring systems

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SECTION 3
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SECTION 3
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SECTION 3

• Clause 3.11.4.5 Identification of U/G wiring
  systems
• Underground wiring systems shall be identified
  by an orange marker tape complying with AS/NZS
  2648.1 and positioned at approximately 50 of the
  depth of cover above the wiring system or any
  additional mechanical protection.
• Exception
• Underground wiring systems installed by boring,
  provided the location is marked and recorded in a
  readily available permanent location. If a pipe
  is retained after the boring operation,
  orange-coloured pipe or conduit is recommended.

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SECTION 3

• Clause 3.11.4.6 Marking and recording of U/G
  cable location
• The presence of U/G wiring shall be marked and
  recorded as follows
• Permanent cable marker signs shall be provided to
  indicate the point where a cable enters or leaves
  a structure
• Exception
• Cable entry signs need not be provided where the
  position of U/G cable entry into the ground is
  obvious.

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SECTION 3

• Clause 3.11.4.6 Marking and recording of U/G
  cable location (continued)
• or
• The route shall be recorded on a plan to enable
  future location. This plan shall be located at
  the switchboard from which the circuit
  originates. The plan locating the consumers
  mains shall be kept at the main switchboard.

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PART 2 - SECTION 4SELECTION AND INSTALLATION OF
APPLIANCES AND ACCESSORIES

• Clause 4.5.2.3 Recessed luminaires
• Recessed luminaires and their auxiliary
  equipment shall be installed in a manner designed
  to minimize temperature rise and prevent the risk
  of fire.
• This requirement shall be satisfied by one of
  the following methods
• The use of a luminaire specifically designed and
  certified by the manufacturer to permit
• (i) contact with combustible materials or
• (ii) enclosure or covering by thermal
  insulation, as appropriate to the location
  of the luminaire.

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SECTION 4

• Clause 4.5.2.3 Recessed luminaires (continued)
• Installation of the luminaire within a
  fire-resistant enclosure.
• Provision of required clearances from combustible
  and thermal insulating material as specified by
  the manufacturer of the luminaire.
• Provision of the default clearances from
  combustible and thermal insulating material as
  specified in Figure 4.7.
• Where manufacturers installation instructions
  that specify required clearances are not
  available the luminaire shall be installed in
  accordance with (b) or (d).

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SECTION 4

• Clause 4.5.2.3 Recessed luminaires (continued)
  
• Where thermal insulation is of a type that is
  not fixed in position, e.g. loose fill, a barrier
  or guard constructed of fire-resistant material
  shall be provided and secured in position to
  maintain the necessary clearance (see Figure
  4.7).
• Where thermal insulation may reasonably be
  expected to be installed in the space containing
  a recessed luminare, the luminaire shall be
  installed in such a manner as to provide for the
  subsequent installation of thermal insulation.

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SECTION 4
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SECTION 5 - EARTHING
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SECTION 5

• Clause 5.5.1.3 Labeling
• The main earthing conductor shall have a
  permanent label attached at the connection to the
  earth electrode with a legible warning against
  disconnection in the following form
• WARNING MAIN ELECTRICAL EARTHING CONDUCTORDO
  NOT DISCONNECT
• Exception Where the method of connection to the
  electrode precludes disconnection this
  requirement need not apply.

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SECTION 5
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SECTION 5

• Clause 5.6.2.5 Showers and bathrooms
• Any conductive reinforcing within a concrete
  floor or wall forming part of a shower or
  bathroom shall be bonded to the earthing system
  of the electrical installation to avoid any
  potential differences that may occur between
  conductive piping (including taps, drain, etc)
  connected to, or in contact with, the electrical
  installation earthing system and the concrete
  floor or wall.

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SECTION 5

• Clause 5.6.2.5 Showers and bathrooms (continued)
• An equipotential bonding conductor, in accordance
  with Clause 5.6.3, shall be connected between the
  reinforcing material and any part of the earthing
  system within the room.
• Note Clause 5.6.3.2(b) requires 4mm2 conductor.

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PART 2 - SECTION 6DAMP SITUATIONS

• Clause 6.7 Sanitization and general hosing-down
  operations
• Electrical installations where the requirements
  of this clause may apply include, without
  limitation, food production or processing areas
  and agricultural or horticultural premises, such
  as rooms, locations or areas where
• livestock are kept or
• feed, fertilizers, vegetable or animal are
  produced, stored, prepared or processed or

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SECTION 6

• Clause 6.7 Sanitization and general hosing-down
  operations
• (continued)
• (c) Plants are grown, such as greenhouses or
  hydroponic installations or
• (d) Agricultural or horticultural products are
  produced, prepared or processed, e.g. dairies,
  drying, stewing, pressing out, fermenting,
  butchering, meat processing, etc.
• Clause 6.7.4.4. Switchboards shall have IPX6
  enclosures.

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PART 2 - SECTION 7SPECIAL ELECTRICAL
INSTALLATIONS

• Clause 7.3 Electrical Generation Systems
• New Clause covering
• Engine-driven generator sets
• Stand-alone power systems, e.g. photovoltaic,
  wind turbine etc
• Grid-connected inverter systems.

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SECTION 7

• Clause 7.3.5.2.2 - RCDs
• Where an electricity generation system includes
  an inverter, the RCD shall be of a type suitable
  for the waveform of the particular inverter, and
  in accordance with the inverter manufacturers
  instructions.
• Note Requirements for types of RCDs are set out
  in Clause 2.6.2.2.

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SECTION 2

• Clause 2.6.2.2 Types of RCDs
• States in part
• In Australia, an RCD shall be of the type that
  tripping is ensured when the waveform is
  sinusoidal.
• Note
• 1. The possible waveform of a fault current to
  earth can affect the operation of an RCD and
  shall be taken into account for the selection of
  the type of RCD.

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SECTION 7
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SECTION 7
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SECTION 7

• Clause 7.8 Specific Electrical Installation
  Standards
• This Clause outlines those Standards that are
  applicable to specific electrical installations.
• AS/NZS 3001 Relocatable installations and their
  site supply
• AS/NZS 3002 Shows and carnivals
• AS/NZS 3003 Electromedical treatment areas
• AS/NZS 3004 Marinas and recreational boats

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SECTION 7

• Clause 7.8 Specific Electrical Installation
  Standards
• (continued)
• AS/NZS 3012 Construction demolition sites
• AS/NZS 3832 Cold-cathode illumination systems
  (HV neon)
• AS/NZS 3015 Telecommunications networks power
  supplies
• Installations complying with AS/NZS 3018 (Single
  domestic installations) are deemed to comply with
  this Standard.

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SECTION 7

• Guidance Standards
• AS/NZS 3010 Generating sets
• AS/NZS 3014 3016 Electric fences
• AS/NZS 4249 Film, video TV sites.
• Appendix A contains a list of referenced
  documents, compliance with which is called up as
  a mandatory requirement for those Standards
  listed as Normative References.

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SECTION 8VERIFICATION

• Clause 8.3.6.2 Results
• The insulation resistance between
• the conductors of consumers mains and submains
  and
• live and earthed parts of an electrical
  installation, or parts thereof, including
  consumers mains and submains
• shall be not less than 1 MO.

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SECTION 8

• Clause 8.3.9.1 Socket outlets not RCD protected
• The impedance required for automatic
  disconnection of supply to socket outlet circuits
  not RCD protected shall be verified by
• verification of the total resistance (Rphe) of
  the active and protective earthing conductors
  or
• where supply is available, verification of the
  earth fault loop impedance,
• in accordance with Clause 8.3.9.3. (eg.
  measurement or by using a fault loop impedance
  test device).
• S. 12 Electrical Safety Regulation 2002.

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SECTION 8
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SECTION 8

• Clause 8.3.10 Operation of RCDs
• Where supply is available, the function of the
  RCD shall be verified by the operation of the
  integral test device, or by the use of special
  test equipment.
• Tests shall be performed on each final subcircuit
  protected by an RCD to verify that the RCD
  functions correctly to disconnect the designated
  circuit
• Clause 8.3.10.3 The RCD shall disconnect
• supply.

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SECTION 8

• Clause 8.4 Date of initial energisation of an
  installation
• The date of initial energisation of an
  installation should be available on-site, either
  by marking or in an accessible record.
• Either month and year or year only will be
  acceptable.

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APPENDIX C
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APPENDIX C
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APPENDIX C

• Examples of other Tables in Appendix C
• TABLE C1 Maximum demand single multiple
  domestic
• TABLE C2 Maximum demand non-domestic
• TABLE C3 Maximum demand Energy demand method
  for non-domestic installations
• TABLE C8 Guidance on the loading of points per
  final subcircuit.

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APPENDIX D
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APPENDIX D

• Examples of Tables in Appendix D
• TABLE D1 Sinking of posts/poles in ground
• TABLE D2 Force exerted by aerial line
  conductors
• TABLE D6 Round hardwood pole - strength
  ratings
• TABLE D10 Grade 250 steel pipe strength
  ratings
• TABLE D12(a) Grade 350 steel square section
  strength ratings.

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OTHER NEW APPENDICES

• APPENDIX E Electrical installation requirements
  in National Building Codes (e.g. BCA)
• APPENDIX F Installation of surge protective
  devices
• APPENDIX G Degrees of protection of enclosed
  equipment (i.e. IP ratings)
• APPENDIX H WS Classification of wiring systems
  (i.e. fire ratings)
• APPENDIX I Protective device ratings and sizes
  of imperial cables
• APPENDIX J1 Symbols used in this Standard.

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WHAT HAPPENS NEXT?

• Electrical work commenced under AS/NZS 30002000
  prior to 01/06/2008 may continue
• Electrical work which has been quoted and a
  contract has been awarded may be performed
  under AS/NZS 30002000
• Large projects designed under AS/NZS 30002000
  (e.g. shopping centres) may be performed under
  that Standard.
• Can be applied immediately, but comes into force
  in Qld on 01/06/2008.

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