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Library›TRUM Vol 4 Part 3›7 Commentary
TRUM Vol 4 Part 3

Contents

  • Copyright
  • Licence
  • CC BY licence summary statement
  • Translating and interpreting assistance
  • Feedback
  • 1General electrical requirements
  • 2Road lighting requirements
  • 3Traffic signal requirements
  • 4Intelligent transport systems requirements
  • 5Residual current device protection
    • 5.1Introduction
    • 5.2Residual current devices terms and definitions
    • 5.3What is a residual current device?
    • 5.4Purpose of a residual current device
    • 5.5How residual current devices work
    • 5.6Limitations of residual current devices
    • 5.7Types of residual current devices
    • 5.8Specifying a residual current device
    • 5.9Installing the residual current device
    • 5.10Testing the residual current device
    • 5.11Where residual current devices are required
    • 5.12AS/NZS 3000 Clause 2.6.3.2.1 Exception 5
    • 5.13AS/NZS 3000 Clause 2.6.3.2.1 Exception 6
    • 5.14Discussion
    • 5.15Risk assessment tables
    • 5.16Risk assessment
  • 6Surge protection
    • 6.1Introduction
    • 6.2Surge protective devices technical terms and parameters
    • 6.3What is a surge protection device?
    • 6.4Purpose of a surge protection device
    • 6.5How surge protection devices work
    • 6.6Limitations of surge protection devices
    • 6.7Causes of surge and surge modes
    • 6.8Surge protection device characteristics
      • 6.8.1Method of operation
      • 6.8.2Technologies
      • 6.8.3Surge protection device configuration
      • 6.8.4Classification
      • 6.8.5Standard operating conditions
      • 6.8.6Examples of surge protection devices
    • 6.9Surge protection device test waveforms
    • 6.10Effect of surge protection devices on test waveform
    • 6.11Determining need for power surge protection devices
    • 6.12Design considerations
    • 6.13Specifying power surge protection devices
    • 6.14Installation of power surge protection devices
    • 6.15Earthing and bonding
    • 6.16Telecommunications
    • 6.17Practical applications
    • 6.18Summary
  • 7Commentary
    • 7.1Introduction
    • 7.2Abbreviations and definitions
    • 7.3Design voltage and frequency
    • 7.4Designing for maximum demand
    • 7.5Designing with circuit breakers
    • 7.6Designing with fuses
    • 𝐼2 = 1.6 𝐼𝑁
    • 7.7Designing with contactors
    • 7.8Designing for cables in conduit
    • 7.9Designing with an uninterruptible power supply
    • 7.10Designing for cable current carrying capacity
    • 7.11Designing for cable short circuit protection
    • 7.12Designing for voltage drop
    • 7.13Designing for earth fault loop impedance
      • 7.13.1Earth fault loop impedance
      • 7.13.2Effects of current through the body
      • 7.13.3Body impedance
      • 7.13.4Touch voltage
      • 7.13.5Disconnect times
      • 7.13.6Relationship between body current parameters
      • 7.13.7Continuing with earth fault loop Impedance
      • 7.13.8The 20 / 80 assumption
      • 7.13.9Transformer impedances
      • 7.13.10Distribution cable impedances
      • 7.13.11Calculating external earth fault loop impedance
      • 7.13.12Calculating internal earth fault loop impedance
      • 7.13.13Maximum values of earth fault loop impedance
  • 8Multidisciplinary projects

7.13Designing for earth fault loop impedance#

Source: TRUM Vol 4 Part 3 · page 136 Open PDF at this page Search this document
← Previous7.12 Designing for voltage drop Next →7.13.1 Earth fault loop impedance
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