National Energy (TNB) has a guide for its customers planning to install a home EV charger, outlining the prescribed steps that must be taken to determine whether one’s home is ready for the safe installation of a home EV charger.
The process begins with consultation, and homeowners should first seek the help of a contractor registered with the ST (Energy Commissionof Energy Commission) to inspect the internal wiring and distribution board (DB) and assess the electrical charging capacity for electric vehicle charging.
The ST qualified contractor will then need to confirm the delivery schedule and determine the total load requirement, including the EV home charger. A single-phase supply supports a total load of up to 10 kW, while loads above 10 kW require a three-phase arrangement.
Should wiring upgrades be necessary, your electrician can recommend internal upgrades including wiring improvements, new main circuit breakers (MCB), a ground fault circuit interrupter (RCD) for safety, along with other improvements to the distribution board or safety protection devices. If an upgrade to three-phase wiring is required, only Tenaga Nasional may process and approve upgrades to the on-site electricity supply.
Tenaga Nasional notes that the EV home charger must be approved by ST, the installer must be ST registered and a competent person or company in accordance with Act 447 of the Electricity Supply Act 1990. Mode 1, or direct charging from the mains socket, is not permitted, while Mode 2 (wall socket with locker) and Mode 3 (Type 2 AC charging) are permitted.
For wiring, the minimum wiring size is six square millimeters, or 10 square millimeters if the wiring is exposed to sunlight. The installation of the electrical outlet must be at least 1.2 m above the ground and the installation of a ground fault circuit interrupter (RCD) and a ground fault circuit interrupter (GFCI) is required.
Once the EV home charger is installed, regular inspections and maintenance should be scheduled. On a Mode 2 charging setup, TNB does not recommend the use of extension cords and a Class C fire extinguisher (for electrical fires) should be placed nearby.
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