Answer
Installing an Electric Vehicle (EV) charger at home involves more than just plugging in. Two critical safety measures often required are Surge Protection and Load Management.
What is Load Management?
Your home’s electrical supply is limited by the Distribution Network Operator (DNO), typically to 60, 80, or 100 amps. Adding an EV charger increases demand, which can risk exceeding this limit. If an upgrade isn’t possible, a Load Management Device helps balance usage.
Why is it Needed?
- Prevents overloading your property’s supply.
- Ensures safe operation of EV chargers alongside other appliances.
- Avoids tripping circuits or damaging equipment.
How It Works
- Monitors real-time household consumption.
- Dynamically adjusts power to the EV charger.
- Temporarily reduces or pauses charging if demand approaches the limit.
What is Surge Protection?
Surge Protection Devices (SPDs) protect against sudden voltage spikes caused by:
- Lightning strikes
- Grid switching
- Faults in the supply network
Without protection, these surges can damage your EV charger and pose a shock risk.
Why is it Needed?
- Complies with BS 7671 wiring regulations.
- Prevents electric shock from dangerous touch voltages.
- Protects sensitive electronics from damage.
EO Chargers
- O-PEN Protection: Detects broken neutral paths (Open PEN faults).
- Why Important: Prevents dangerous touch voltages when the neutral connection fails.
- Limitation: Standard RCDs cannot detect this fault, so O-PEN protection is essential.
NOTE: The O-PEN Protection is built into the charger.
Alfen Chargers
- Surge Protection: Uses a matt:e SP-EVCP device, which disconnects live conductors and earth within 5 seconds if voltage exceeds 253V or drops below 207V.
- Compliance: Meets BS 7671:2018 Amendment 1:2020 Regulation 722.411.4.1 (iv).
- Extra Feature:
- Load Curtailment: Isolates the charger if household consumption exceeds a preset limit, restoring power when safe.
NOTE: The matt:e unit is separate from the charger.