Can a normal electrican install a EV charger? Yes, provided the electrician follows the SANS 10142-1 regulations + Electrical Code & Regulatory Requirements for Imports (National Regulator for Compulsory Specifications)
Here is a installer’s cheat sheet for residential EV charging infrastructure in South Africa.
1. Charger Selection vs. On-Board Limits
- The Reality: While most premium vehicles come with wall boxes (charger), all come with a portable “granny cable” (limited to 10A–16A on a standard domestic plug),
- A dedicated Wallbox is required for true Level 2 home charging (over 16 amps)
- Installer Rule: Checks the specific vehicle’s On-Board Charger (OBC) capacity before specifying the wallbox. For instance, if a plug-in hybrid can only accept a single-phase 7.4 kW feed, installing a premium 22 kW three-phase unit won’t speed up the charge time—the car’s internal computer will simply ignore the extra available power.
2. Property Base-Power Assessment
- The Reality: Most standard South African suburban homes run on a single-phase 60A to 80A main supply circuit breaker.
- Installer Rule: A standard 7.4 kW charger draws 32A continuously. If the household is already pulling heavy loads (ducted air conditioning, electric geysers, pool pumps, ovens) on a 60A main supply, adding an unmanaged 32A EV load will trip the main municipal breaker. The electrician must perform a baseline load assessment; if the margin is too tight, spec a charger with dynamic load balancing or prioritize charging during off-peak midnight hours.
3. RCD (Earth Leakage) Selection: No Standard “Type AC”
- The Reality: Standard household earth leakages (Type AC) are completely blind to the smooth DC residual fault currents generated by EV batteries and vehicle charging electronics. Worse, DC leakage can “blind” or saturate a standard Type AC breaker, preventing it from tripping even during a fatal household AC fault.
- Installer Rule: Installers (electricians) must use a Type A RCD paired with an integrated 6 mA DC fault sensor (built into most modern smart chargers), or install a standalone, dedicated Type B RCD in the distribution board.
4. The 125% Continuous Load Rule
- The Reality: Unlike household appliances that cycle on and off (like a fridge or iron), an EV charger represents a continuous, maximum-draw electrical load running for hours on end. This creates massive thermal stress inside the distribution board.
- Installer Rule: To prevent nuisance tripping and thermal degradation, protection switchgear must be derated. Size the circuit breaker and supply cabling to handle 125% of the charger’s maximum current. For a standard 32A charger, protect the circuit with a 40A circuit breaker and run a minimum of 6 mm² copper wire (step up to 10 mm² for long cable runs over 25 meters to control voltage drop).
5. Earthing and PME Fault Protection
- The Reality: EVs use the metal chassis of the car as an extension of the earth loop. A lost or poor earth connection can cause the vehicle frame to become live, posing a massive shock hazard (rare).
- Installer Rule: Confirm a robust, low-resistance earth path back to the main supply. If the charger does not feature built-in open-PEN/neutral fault protection, installing an isolated dedicated earth spike for the EV charging circuit is highly recommended.
6. Solar Integration: The Strict Divider Line
- The Reality: Modern clients want their solar arrays to power their vehicles, but overlapping the control circuitry causes major diagnostic failures.
- Installer Rule: Keep the installation lanes entirely separate. Electricians should not hardwire the charger into the heavy-backup output side of a standard hybrid solar inverter unless the inverter is specifically oversized to handle a continuous 32A spike without overloading its internal transistors. Instead, tap the charger feed directly from the Main Grid/Non-Essential side of the DB board. Let the integration happen via software/CT clamps (current transformers) that tell the charger to dynamically match its draw to the excess solar generation measured at the main boundary meter.
Registered Installation Electricians Only
The Reality: In South Africa, a permanent EV charger installation constitutes a major modification to the fixed electrical infrastructure under the Occupational Health and Safety Act.
Installer Rule: The installation must be performed or strictly supervised by a registered electrical contractor holding a valid Wireman’s License. Upon completion, a formal Certificate of Compliance (CoC) must be issued detailing the new dedicated EV circuit breaker, RCD type (this is really important), and measured earth loop impedance.
Without this CoC, the homeowner’s insurance policy is completely void in the event of a residential fire.
Pro-Tip on Infrastructure: Even if a client currently drives a single-phase vehicle, if you are opening trenches or routing new conduit from the main distribution board to the garage, it’s always good practice to pull extra wires for potential Smart Features (i.e. CT integration). It’s far cheaper now than doing it later.
Can a normal electrican install a EV charger?
