ver had a problem with nuisance RCD tripping? Now the 18th Edition Wiring Regulations and the latest leakage current clamp meter from Martindale Electric,

the CM69, come to the rescue. Modern appliances and plug-in power supplies, by the nature of their design,


olec EV has confirmed that its entire range of Electric Vehicle charging points have been developed to meet and

comply with the new IET 18th Edition Wiring Regulations that came into force on 1stJanuary 2019. Kieron Alsop, Rolec EV’s Managing Director, commented:

“As the manufacturer of Europe’s largest range of EV charging points and solutions, the last 6 months has been a busy period for our Engineering department. “Our Engineers have been designing a variety of new internal

components for introduction into our EV charging range in order to comply with the 18th Edition Wiring Regulations. “These new components have been designed in keeping

with the traditional Rolec direction, whereby every component within our charging points can be easily removed and replaced onsite by a maintenance engineer - therefore keeping any potential downtime to a minimum. “The recent regulation changes called for all charge points

to now include specific levels of DC sensitive protection, as well as a facility to connect the charging point to a TT earthing system.” Kieron continued: “After careful consideration, we decided

that all Rolec EV charge points installed from 1st January 2019 would include the new DC sensitive device and TT earthing facility as standard. This means that anybody installing a Rolec EV charging point has the peace of mind and confidence in knowing that it fully complies with all current regulations. “A key benefit of including the regulation updates within

our charging points is that the actual installation costs are kept to a minimum by avoiding having to purchase and install expensive DC sensitive RCD protection at source. “Another benefit with the design of the modular DC

sensitive device is that it can be easily and quickly fitted to pre 18th edition EV charging points.”


vailable from specialist distributor Switchtec, a Lightning Current Counter from leading Surge Protection Device Manufacturer “Citel” which records localised lightning strikes. The LSC-A Lightning Strike Counter is designed to detect and record impulse current conducted by the Down conductors of

a Lightning Protection System or by the earth wire of an installation with or without an installed Surge Protection system. It is extremely useful to assess the stress placed on installed Surge Protection Devises. The LSC-A can detect Lightning induced voltage up to 100k Amps and can count up to 999,999 events before resetting. Requiring no external power supply, the device is powered by its internal battery, and has a life expectancy of over 10 years. The design is a compact size measuring just 66 x 55 x 47mm. Its housings is IP67 and manufactured from a high grade UL94-V0 Thermoplastic,

coloured Green and Yellow making it highly visible and suitable for installation inside or outside of a property. The counter is also manufactured in accordance to EN 62561-6. Two Version of the counter are available. A Direct Cable/Conductor mount or Din Rail Mount. Both utilise a through wire mounting connection, where the device is mounted directly on the Lightning Conductor or earth wire by the means of a Clamp/bracket. This enables the counter to be retro fitted easily onto any system without the need for cutting or terminating any wires or cables. Switchtec offers a full range of surge protection devices from Citel including AC Type 1, 2 & 3 SPD’s, DC & Photovoltaic SPD’s Coaxial SPD’s and SPD’s for use in the LED Lighting industry.

Switchtec 34 FEBRUARY 2019 | ELECTRICAL ENGINEERING 

generate low levels of leakage current even when there is no fault present. This becomes a problem when there are several appliances connected to the same circuit and their leakage currents add up to exceed the trip threshold of the RCD protecting the circuit, unexpectedly cutting the power at the most inconvenient times. What are acceptable limits for leakage current and how do you know when you are approaching those limits? The 18th Edition now makes it clear; the accumulation of circuit protector currents/earth leakage currents that are present during normal operating conditions shall not be more than 30% of the rated residual operating current of the RCD e.g. a PE current of no more than 30% of 30mA which is just 9mA. This is necessary when you consider that it’s not unusual for a 30mA RCD to start tripping just above 15mA. The trouble is how do you know when you are approaching 9mA? Computers,

printers and other appliances can easily generate leakage currents in the range of 1mA to 3.5mA each. Rather than estimate the total incorrectly, measuring the leakage current flowing in

an existing installation before modifying it, is probably the most effective approach to ensure the final installation is going to be fit for purpose. The alternative could be expensive call outs in months to come. Selecting the right leakage clamp meter is critical to getting reliable and repeatable results as many struggle below 10mA and can be prone to interference from other nearby conductors carrying higher currents. The Martindale CM69 accurately measures currents from 0.1mA to 60A with a

resolution down to 0.001mA and includes essential multimeter functions. For more information, please contact Martindale Electric on 01923 441717 or visit: to watch a video on how to make reliable leakage current measurements and troubleshoot nuisance tripping and other installation problems.

Martindale Electric

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