Steve Dunning, Managing Director of Martindale Electric, explains why in electrical installations, safety is not merely a priority - it is an absolute necessity.
Every installation must be tested thoroughly, using precise, reliable instruments and proven methods. This is where Multifunction Testers (MFT’s) play a vital role. Now a mainstay of the 18th Edition test market, MFT’s streamline the testing process by combining multiple essential tests into a single, handheld device, making electrical testing faster, safer, and more efficient.
For electrical contractors, an MFT often represents one of the most significant business investments that cannot be directly charged to a customer. With an ever-expanding range of models and new features regularly being introduced, selecting the right tester can be a challenge. The key is to choose a unit that aligns with both current and anticipated business needs. While some high-end models come packed with advanced functions, these may not be necessary for all contractors, particularly if their typical projects do not demand them.
The Efficiency Advantage
MFT’s are designed to maximise efficiency by combining multiple testing functions into a single instrument. Beyond the standard tests required for compliance with the 18th Edition Wiring Regulations, today’s testers often include capabilities such as voltage measurement, phase rotation checks, and EV charger testing, with varying documentation and reporting options.
This level of integration makes a substantial difference, especially on larger or time-critical projects. Because electricians do not need to switch between multiple devices, setup time is reduced and workflow is simplified. Moving directly from one test to another without interruption can dramatically boost productivity, particularly for professionals managing multiple jobs or large-scale installations.
Additionally, using one integrated tester reduces the risk of error. Fewer cables and instruments mean less potential for misconnection or confusion. Many modern MFT’s are designed with intuitive user interfaces and onscreen guidance that simplify even complex procedures. This reduces the likelihood of mistakes and the need for repeat testing.
Practical features further enhance usability. Large, high contrast LCD or colour displays make results easy to read, even in dimly lit environments. Some displays are even colour-matched to test lead indicators for greater clarity. Certain models offer on-device data storage, allowing results to be transferred seamlessly to smartphones or laptops for analysis and reporting.
Accuracy and Maintenance
While efficiency is critical, accuracy remains the cornerstone of electrical testing. Reliable, repeatable measurements are essential for certification and compliance documentation. Maintaining and calibrating a single MFT is usually simpler and more cost-effective than managing multiple test instruments.
Calibration remains the responsibility of the user, and manufacturers’ recommendations should always be followed. Using a checkbox or proving unit between formal calibrations helps verify ongoing measurement accuracy. For example, the Martindale PD440SRDX proving unit features a unique CALCHECK function, which allows users to confirm the insulation and low-resistance ranges of 18th Edition MFT’s onsite, ensuring confidence in results wherever the work takes place.
Core Test Functions
Most MFT’s support a comprehensive suite of essential electrical safety tests, including:
Continuity Tests: Detect insulation breakdowns within an electrical system, including issues in wires, transformers and motors, by measuring low resistance (ohms).
Insulation Resistance Tests: Measure high resistance levels to check insulation strength, ensuring safe operation across different electrical components.
Earth Fault Loop Impedance Tests: These tests assess a circuit's capability to activate protective devices like circuit breakers, fuses, and RCDs. MFT’s offer a quick and straightforward way to ensure circuit safety in fault conditions.
RCD Tests: Residual circuit devices (RCDs) must disconnect rapidly to prevent electric shocks and address issues like current leaks that could cause fires. MFT’s test RCD performance to confirm they meet required safety standards.
Selecting the Right MFT
Choosing an MFT that matches operational requirements is essential for every electrician. Basic models provide all the fundamental functions needed for 18th Edition compliance, while advanced models include additional capabilities such as EV testing and onboard memory for storing and exporting results.
Contractors should consider both current and future needs when investing in an MFT. With electric vehicle infrastructure expanding rapidly, models that can be upgraded or are already equipped for EV testing provide long-term flexibility and value.
The Martindale ET6000 Series
Martindale Electric’s ET6000 Series exemplifies this balance of performance, reliability, and forward-thinking design. Suitable for everything from routine installations to complex projects, the range offers clarity, precision, and ease of use. Each model features a full colour display that provides clear connection guidance and test results, minimising confusion and allowing electricians to focus fully on the task at hand.
The ET6000 is an ideal entry-level model, covering all essential functions required by the 18th Edition Wiring Regulations. The ET6300 offers additional flexibility and can be upgraded at any time for EV testing using the Martindale TL326EV adapter. The ET6500 builds on these capabilities, incorporating both the TL326EV adapter and 3-wire and 4-wire earth testing functionality. It also includes onboard data storage, allowing users to save and download results directly into Excel for streamlined documentation.
A Smart Investment
Whether testing a new installation or verifying an EV charging point, having the right MFT is key to maintaining safety, efficiency, and compliance. MFT’s deliver reliable accuracy, convenience, and versatility - qualities that every professional electrician depends on.
Selecting the right tester is not just about meeting today’s standards but also about being prepared for tomorrow’s requirements. A high quality MFT is a long-term investment that enhances productivity, ensures safety, and simplifies compliance to make it one of the most valuable tools in any electrician’s kit.
For more information visit: https://martindale-electric.co.uk/mft/
