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    Neutral Supply Tester

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    EFO is the Distributor for Dewar NST Network Testers. The Neutral and Supply Tester was designed in conjunction with Power companies. To ensure the incoming Active and Neutral power connections. To customer’s premises are correctly identified and safe. They are use before a power connection is made. Our ETL20SS Independent Earth Trailing Lead is also used in conjunction with this product. EFO Also supplies a Cable Tracer and Tone Generator  for telecommunications and dead Electrical cables.

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    Electrical Network Verification

    Neutral Supply Tester

    Electrical Factory Outlet is an Australian distributor of Dewar NST
    network testers. The Neutral Supply Tester was developed in
    consultation with electricity network providers to help verify incoming
    active and neutral supply connections before a power connection is
    completed.

    A neutral supply tester helps confirm that the customer’s premises have
    been correctly identified and that the incoming electrical connection
    is suitable for the required work.

    Dewar NST network testers are commonly used before connecting a
    property to the electricity supply, helping electricians and authorised
    service providers verify active, neutral and earth conditions.

    Our ETL20SS 20-metre independent earth trailing lead can be used with a
    neutral supply tester to provide an independent reference to ground
    during applicable testing procedures.


    Supply Verification


    Confirm incoming active, neutral and earth network conditions


    Utility Developed


    Dewar NST network testers developed with power network companies


    Independent Earth


    Compatible ETL20SS earth trailing lead available for ground reference

    Why Choose Us

    Trusted Tools, Proven Performance – Why Choose Us

    At Electrical Factory Outlet, we support electricians, smart meter
    installers and authorised service providers with reliable tools
    designed for real-world electrical network work.

    EFO is a distributor of Dewar NST network testers and also supplies
    the testing equipment and personal protective equipment commonly
    required by smart meter installers.

    Equipment requirements can vary between Australian states,
    electricity distributors and utility providers.

    Common personal protective equipment may include flame-resistant
    clothing, arc-rated face shields, low-voltage rescue kits, insulated
    gloves, electrical lockout kits and asbestos removal kits.

    Testing equipment requirements may include CAT IV multimeters with
    LoZ functionality, voltage proving units, phase rotation meters, test
    lamps, smart meter load testers and Neutral Supply Testers.

    Our team can help professionals identify suitable network testing
    tools and PPE for their application and local utility requirements.

    • Australian distributor of Dewar NST network testers
    • Neutral Supply Testers for network connection verification
    • Models suited to different state supply requirements
    • Independent earth trailing leads available
    • CAT IV multimeters with LoZ functionality
    • Voltage proving units and phase rotation meters
    • Smart metering PPE and rescue equipment
    • Locally stocked products and Australia-wide delivery

    ✓
    Network Identification

    NST Network Testers for Accurate Network Identification

    Working on an electrical network without correctly verifying the supply
    can lead to incorrect connections, electrical hazards and compliance
    issues.

    NST network testers are designed to identify and verify neutral, active
    and earth supply conditions before a connection, disconnection or
    modification is completed.

    A neutral supply tester helps electricians confirm the correct
    relationship between the incoming conductors and the customer’s
    installation.

    This is particularly important during smart meter installations,
    service upgrades, new connections and network-related maintenance.

    Verifying the network configuration before work begins helps reduce
    connection errors and supports safer electrical procedures.

    ✓
    Utility and Field Testing

    Dewar Network Testers for Supply Verification

    Active, Neutral and Earth Testing

    The Dewar Neutral Supply Tester measures voltage, impedance and polarity
    in relation to the connected active, neutral and earth conductors.

    Safe or Unsafe Condition

    The test results help determine whether the connected electrical supply
    presents an acceptable or potentially unsafe condition before the work
    proceeds.

    Residential, Commercial and Utility Work

    Dewar network testers can be used in industrial, commercial and
    domestic applications where reliable supply identification is required.

    Bluetooth Test Records

    Selected current NST models include Bluetooth connectivity for use with
    the NSTLINK app, allowing users to enter meter information, download
    results, save records and share test results by email.

    Our Product Range

    Explore Our Complete Electrical Equipment Range

    At Electrical Factory Outlet, we provide a complete range of tools,
    testing equipment and protective solutions to support electricians
    across installation, maintenance and electrical safety work.


    01

    Electrical Test Equipment

    The range includes multifunction testers, insulation resistance
    testers, RCD testers, voltage indicators, test lamps, load testers,
    CAT IV clamp meters with LoZ and CAT IV multimeters with LoZ.

    It also includes contact and non-contact phase rotation meters and
    voltage-testing proving units.

    These tools help electricians diagnose faults, verify installations
    and confirm that electrical systems meet safety requirements before
    and after work is completed.


    02

    HV Test Lab

    Our current equipment configuration can test and certify insulated
    gloves to AS/NZS IEC 60903:2020 and AS 2225.

    Insulated mats can be tested to AS/NZS 61111:2020 and AS/NZS 2978.

    This helps ensure protective equipment meets relevant Australian
    standards and performs reliably under high-voltage working
    conditions.


    03

    Electrical Tools and Equipment

    Our range includes 1000V VDE insulated socket sets, spanner sets,
    pliers, side cutters, screwdrivers, torque wrenches, hexagon-key
    T-wrenches and Torx bit sets.

    Electrical hot sticks, telescopic fuse pullers and overhead-line
    products are also available.

    These tools are designed to improve efficiency while maintaining
    safety when working on live or complex electrical systems.


    04

    Level 2 ASP Equipment

    This equipment supports safe handling of network-level work and
    compliance with relevant industry requirements.

    The range includes harnesses, pole straps, pole-top rescue kits,
    service-line tensioners, service-line come-alongs, linesman’s scratch
    brushes, cable-core separation tools, IPC ratchet spanners and pole
    platforms.


    05

    Smart Metering Equipment

    Equipment and PPE required by smart meter installers may include
    low-voltage rescue kits, lockout kits, asbestos removal kits and NST
    Neutral Supply Testers.

    The range also includes CAT IV multimeters with LoZ functionality,
    voltage-testing proving units, phase rotation meters, test lamps,
    smart meter load testers, Type B first aid kits and FR clothing.


    06

    EV Maintenance and Safety Products

    Electric vehicle safety equipment includes specialised tools and
    protective equipment designed for working on EV systems as
    recommended by the Original Equipment Manufacturer guide or listed in
    AS 5732:2022 – Electric Vehicle Operations, Maintenance and Repair.

    This includes 1000V insulated tools, danger signage, exclusion-zone
    kits, arc-rated face shields, CAT IV multimeters, rescue hooks, car
    fire blankets, Class 0 insulated gloves, thermal imaging cameras and
    FR fire-resistant clothing.

    Using the right equipment helps reduce risks and supports safer
    handling of high-voltage components.

    After-Sales Support

    Warranty & Returns

    NST network testers and related network testing equipment supplied by
    Electrical Factory Outlet are backed by a reliable warranty.

    For full details, refer to our Warranty & Returns Policy.

    Our neutral supply testers, Dewar network testers and testing
    accessories are selected to meet strict quality, safety and performance
    expectations.


    Contact our team

    Australia-Wide Delivery

    Shipping & Delivery

    We offer fast and reliable delivery across Australia for NST network
    testers and related electrical testing equipment.

    Orders are processed efficiently to help ensure neutral supply testers,
    independent earth trailing leads and associated accessories are
    dispatched without unnecessary delays.

    Whether you require a single Dewar network tester or multiple testers
    for a field team, we provide timely delivery to support your electrical
    work.


    Ask about delivery

    Helpful Information

    Frequently Asked Questions

    What are Dewar network testers?

    Dewar network testers are specialised electrical instruments used
    in utility and field environments to verify incoming active,
    neutral and earth supply conditions.

    They help electricians and authorised service providers identify
    electrical conductors and assess the network configuration before a
    power connection is made.

    Different NST models are available because acceptable
    neutral-to-earth voltage limits and utility requirements can vary
    between Australian states.

    The M1121-V2-B model is intended for NSW and the ACT, where the
    specified maximum neutral-to-earth voltage is 10V.

    The M1120-V2-B model is used for applicable work in Queensland,
    South Australia and Victoria.

    The latest Bluetooth-enabled versions can be used with the free
    NSTLINK app on compatible Apple iOS and Android devices.

    The app can be used to enter the meter number, download and save
    test results and share those records by email.

    Why are NST network testers important for electrical work?

    Incorrect identification of active, neutral or earth conductors can
    lead to electric shock, equipment damage and unsafe supply
    connections.

    NST network testers provide measured information that helps
    electricians confirm they are working with the correct network
    conductors and supply configuration.

    Completing this verification before connection or disconnection
    helps improve safety, accuracy and overall work efficiency.

    When should I use a neutral supply tester?

    A neutral supply tester should be used before completing applicable
    connection, disconnection, smart meter installation or network
    modification work.

    It is particularly useful when confirming the incoming active,
    neutral and earth arrangement at a customer’s premises.

    Testing should be completed according to the relevant utility,
    workplace and electrical safety procedures for the location.

    Can Dewar network testers be used in all environments?

    Dewar network testers are designed for residential, commercial,
    industrial and utility field applications where compatible supply
    verification is required.

    However, the correct model must be selected for the applicable
    state, electricity network and neutral-to-earth voltage
    requirements.

    Users should also confirm that the tester, leads and accessories
    are suitable for the electrical environment and working procedure.

    How do NST network testers improve safety on-site?

    The Dewar Neutral Supply Tester measures voltage, impedance and
    polarity in relation to the connected active, neutral and earth
    conductors.

    These measurements help identify whether the incoming supply
    condition is suitable or potentially unsafe before the connection
    work proceeds.

    Confirming the network configuration reduces the risk of connecting
    the wrong conductors, overlooking neutral faults or working with an
    unsafe supply arrangement.

    This helps protect electricians, customers and electrical
    equipment while reducing costly connection errors.