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TEST & MEASUREMENT
THE ULTIMATE EV INSTALLER’S GUIDE ritish Standard 7671:2018: Amendment 2: 2022, commonly known as the IET Wiring Regulations, is the accepted safety standard for most low voltage electrical installations. Section 722 covers Electric Vehicle Charging Installations. Where the maximum demand on the installation, with the intended EV charging equipment connected, does not exceed 13.8kVA the Energy Networks Association should be notified. If the total maximum demand on the installation, with the EV charging equipment installed, exceeds 13.8kVA the District Network Operator (DNO) should be consulted before the installation work commences. DNOs will not usually consent to high current loads, such as EV charging
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equipment, to be supplied from a “looped supply”. A looped supply is where premises are not directly supplied individually but are shared by looping the DNO supply cable in and out of premises. The DNO should be consulted to verify if there is any restriction on the capacity of their supply. Insurers may pose additional requirements on their policies for charging equipment installed inside buildings and where vehicles are charged near a building with additional risks such as a building made of combustible materials, extensive glazing and high-risk buildings. They may refer to a document known as RC59, published by the RiscAuthority. This document can be downloaded for free from the internet. Designers and installers should ask their clients if their
50 February 2024 PROFESSIONAL ELECTRICIAN
In this article the team at Kewtech provide best practice advice and guidance on complying with the standards that cover EV charging installations, while offering tips on the right type of equipment to carry out testing and inspection.
insurance company has been consulted for any additional requirements they may wish to impose in respect of the installation of the EV charging equipment. Circuit protection EV load currents may be continuous for extended periods of time. Manufacturers of distribution boards and consumer units may place special conditions for continuous extended loading on their equipment for periods longer than 30