SNZ HB 30:2002
Bridging The Gap - Supplemental Handbook to AS/NZS 3000:2000 Wiring Rules
This Handbook has been prepared to provide additional information to support the introduction of the AS/NZS 3000 series of Standards cited by the Electricity Regulations. The citation of the AS/NZS 3000 series of Standards introduces a number of key changes to the technical requirements applying to the design, construction, inspection and testing of electrical installations in particular, the establishment of more detailed fundamental safety requirements, and the introduction of further measures to protect against electric shock. This Handbook can also be used to provide supplementary information to the existing teaching guidelines for the electrical installation industry.
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COMMITTEE REPRESENTATION
ACKNOWLEDGEMENT
© COPYRIGHT
CONTENTS
FOREWORD
1 Structure of AS/NZS 3000 and its companion Standards
1.1 Structure of the Wiring Rules
1.2 Companion Standards
1.3 Frequently Asked Questions (FAQs)
2 Fundamental safety outcomes
2.1 General
2.2 Protection for safety
2.3 Installation design
2.4 Selection of electrical equipment
2.5 Installation of electrical equipment
3 Residual current devices (RCDs)
3.1 General
3.2 RCDs as supplementary protection
3.3 Principles of RCD operation
3.4 Classification of residual current devices (RCDs)
3.5 Load (earth) leakage currents
3.6 Wiring of residual current devices (RCDs)
3.7 Testing and certification of residual circuit devices (RCDs) and associated final subcircuits
4 Cable selection
4.1 General
4.2 Cable data
4.3 Cable rating and derating factors
4.4 Cable voltage drop
4.5 Earth fault impedance
4.6 Short-circuit current performance (I2t) of cable
4.7 Worked examples of cable calculations
4.8 Minimum size of cable for voltage drop and earth fault impedance loop
4.9 Fault-loop impedance
4.10 Fault loop
4.11 Measurement of earth fault-loop impedance
4.12 Mains power supply not connected
4.13 EFLI testing methods
5 Verification and reverification of electrical work
5.1 General
5.2 New installations
5.3 Existing installations
6 Fault level effects on electrical equipment
6.1 General
6.2 Guidelines for selecting protective devices
6.3 Factors limiting fault current
6.4 Determining prospective fault current
6.5 Protecting installations against damage from short-circuit faults
APPENDIX
A APPROXIMATE METHOD OF FAULT CURRENT MEASUREMENT
SUPPLEMENT 1
COMPARISION OF MAXIMUM SINGLE PHASE TPS CABLE ROUTE LENGTHS FOR EARTH FAULT LOOP AND VOLT DROP
SUPPLEMENT 2
LINKING OF NEUTRAL AND EARTH BARS IN SWITCHBOARDS
SUPPLEMENT 3
CONNECTABLE (RELOCATABLE) INSTALLATIONS
Introduction
General Requirements
Installation types
Caravans and caravan parks
RCD type in connectable installations
Upgrade Options
Table
1 – Cable voltage drop and EFLI length
2 – Maximum values of fault-loop impedance (Zs) at 230 V a.c.
3 – Maximum values of resistance when resistance of the final subcircuit cables is being measured
4 – Transformer full load current and short circuit currents
5 – Copper cable impedance (ohms)
Figure
1 – RCD operation
2 – RCCBs with multiple neutral bars
3 – RCBOs with subcircuit connections
4 – MEN system (simplified) showing fault current ( I path
5 – Typical tripping characteristic curves
6 – Conversion graph MVA v kA for a 400V 3ph transformer
7 – Prospective short-circuit levels of transformers
8 – Prospective short-circuit levels
S2.1 – Sub-switchboards with neutral to earth links fitted
S2.2 – Sub-switchboards without neutral to earth links fitted
S3.1
S3.2
S3.3
S3.4
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References
Electrical installations - In-service testing
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COMMITTEE REPRESENTATION
ACKNOWLEDGEMENT
© COPYRIGHT
CONTENTS
FOREWORD
1 Structure of AS/NZS 3000 and its companion Standards
1.1 Structure of the Wiring Rules
1.2 Companion Standards
1.3 Frequently Asked Questions (FAQs)
2 Fundamental safety outcomes
2.1 General
2.2 Protection for safety
2.3 Installation design
2.4 Selection of electrical equipment
2.5 Installation of electrical equipment
3 Residual current devices (RCDs)
3.1 General
3.2 RCDs as supplementary protection
3.3 Principles of RCD operation
3.4 Classification of residual current devices (RCDs)
3.5 Load (earth) leakage currents
3.6 Wiring of residual current devices (RCDs)
3.7 Testing and certification of residual circuit devices (RCDs) and associated final subcircuits
4 Cable selection
4.1 General
4.2 Cable data
4.3 Cable rating and derating factors
4.4 Cable voltage drop
4.5 Earth fault impedance
4.6 Short-circuit current performance (I2t) of cable
4.7 Worked examples of cable calculations
4.8 Minimum size of cable for voltage drop and earth fault impedance loop
4.9 Fault-loop impedance
4.10 Fault loop
4.11 Measurement of earth fault-loop impedance
4.12 Mains power supply not connected
4.13 EFLI testing methods
5 Verification and reverification of electrical work
5.1 General
5.2 New installations
5.3 Existing installations
6 Fault level effects on electrical equipment
6.1 General
6.2 Guidelines for selecting protective devices
6.3 Factors limiting fault current
6.4 Determining prospective fault current
6.5 Protecting installations against damage from short-circuit faults
APPENDIX
A APPROXIMATE METHOD OF FAULT CURRENT MEASUREMENT
SUPPLEMENT 1
COMPARISION OF MAXIMUM SINGLE PHASE TPS CABLE ROUTE LENGTHS FOR EARTH FAULT LOOP AND VOLT DROP
SUPPLEMENT 2
LINKING OF NEUTRAL AND EARTH BARS IN SWITCHBOARDS
SUPPLEMENT 3
CONNECTABLE (RELOCATABLE) INSTALLATIONS
Introduction
General Requirements
Installation types
Caravans and caravan parks
RCD type in connectable installations
Upgrade Options
Table
1 – Cable voltage drop and EFLI length
2 – Maximum values of fault-loop impedance (Zs) at 230 V a.c.
3 – Maximum values of resistance when resistance of the final subcircuit cables is being measured
4 – Transformer full load current and short circuit currents
5 – Copper cable impedance (ohms)
Figure
1 – RCD operation
2 – RCCBs with multiple neutral bars
3 – RCBOs with subcircuit connections
4 – MEN system (simplified) showing fault current ( I path
5 – Typical tripping characteristic curves
6 – Conversion graph MVA v kA for a 400V 3ph transformer
7 – Prospective short-circuit levels of transformers
8 – Prospective short-circuit levels
S2.1 – Sub-switchboards with neutral to earth links fitted
S2.2 – Sub-switchboards without neutral to earth links fitted
S3.1
S3.2
S3.3
S3.4
SNZ HB 30:2002
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.