Tesla EV Charger Installation UK — PME Protection Guide

⚡ Tesla Wall Connector · 3-Phase PME · UK Installation

Tesla EV Charger Installation UK — PME Protection Explained

Installing a Tesla Wall Connector in the UK involves exactly the same PME protection requirements as any other EV charger. But 3-phase installs — which Tesla increasingly uses for faster charging — add a layer of complexity most guides skip over entirely. This one doesn’t.

Applies to: Tesla Wall Connector Gen 2 & Gen 3 · Single & 3-phase supplies · Single & multiple charger setups
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Direct Answer

A Tesla Wall Connector on a UK PME (TN-C-S) supply requires PEN fault detection — exactly like any other EV charger. On a single-phase supply, a standard single-phase WCED board covers this. On a 3-phase supply, you need a 3-phase PME board specifically rated for 3-phase use. EcoHarmony stocks both — including Tesla-specific 3-phase boards for single and multiple Wall Connector installs.

Tesla Wall Connector Gen 2 & Gen 3 Single & 3-phase covered PEN fault detection required BS 7671 Reg 722.411.4.1 Single & multi-charger boards available
🏠 Plain English — Does a Tesla charger need anything special?

No and yes. A Tesla Wall Connector isn’t a special case under UK electrical regulations — it’s an EV charger like any other, and the same rules apply. What makes Tesla installs feel different is that a significant proportion of them use a 3-phase supply, which changes the protection requirements compared to a standard single-phase domestic install.

If your property has a 3-phase supply and you want faster charging (up to 22kW vs 7kW on single-phase), the protection board needs to be rated for 3-phase. Many installers try to fit a single-phase PME board on a 3-phase install — this doesn’t meet the regulations and isn’t safe. The boards are different products.

What Is a Tesla Wall Connector?

The Tesla Wall Connector is Tesla’s own home and commercial EV charger, available in Gen 2 and Gen 3 versions. Key facts for UK installers:

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Charging speed

Up to 7.4kW on single-phase (32A), up to 22kW on three-phase (32A per phase). The Wall Connector auto-detects the supply and adjusts accordingly.

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Connector type

Gen 3 uses a proprietary Tesla connector for Tesla vehicles only. Requires a Type 2 adapter or separate Type 2 charger for non-Tesla EVs.

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Smart features

App control, scheduling, Powerwall integration, load balancing (when multiple Wall Connectors are daisy-chained). Requires WiFi connection.

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UK compliance

OZEV approved. Requires BS 7671 Section 722 compliant installation — including appropriate PME protection on TN-C-S supplies.

PME Protection for Tesla Installs — Why It’s Required

Approximately 80% of UK homes are on a PME (TN-C-S) supply — where the neutral and earth conductors are combined in the supply cable. Under BS 7671 Regulation 722.411.4.1, any EV charger on a PME supply must have automatic disconnection if a PEN fault occurs.

A PEN fault — a break in the combined neutral/earth conductor upstream — can raise the exposed metalwork of the charger (and vehicle) to a dangerous voltage. Without PME protection, this fault goes undetected and creates a serious shock risk.

This applies to Tesla Wall Connectors exactly as it applies to every other EV charger brand

Tesla’s own installation documentation acknowledges the UK PME requirement. An install without appropriate PEN fault detection on a PME supply is not BS 7671 compliant and should not be signed off by a competent electrician.

Single-Phase Tesla Install on PME

Standard single-phase Wall Connector install (7.4kW, 32A) on a PME supply. Protection required:

  • PEN fault detection device (in the WCED board)
  • Type A RCBO minimum — 32A or 40A depending on cable sizing
  • Type 2 surge protection device (SPD)

All three are combined in EcoHarmony’s single-phase WCED boards. No earth rod required.

Three-Phase Tesla Install on PME

Three-phase Wall Connector install (up to 22kW) on a PME supply. Protection required:

  • 3-phase rated PEN fault detection (a single-phase device is not adequate)
  • 40A RCBO per phase (or equivalent)
  • Type 2 surge protection device
  • 4-pole isolation where required

Critical distinction: A single-phase PME board on a 3-phase Tesla install does not provide adequate PEN fault detection across all three phases. A 3-phase-specific PME board is required.

Products for Tesla Wall Connector Installs

Single Tesla Wall Connector · 3-Phase PME supply · £85

Tesla 3-Phase PME Board — Single Charger

IP40 metal enclosure. PEN fault detection + 40A RCBO + Type 2 SPD. Sized and specified for a single Tesla Wall Connector (or any single 3-phase EV charger) on a UK PME supply. Pre-assembled, ready to install.

  • PME/PEN fault detection — 3-phase rated
  • 40A RCBO protection
  • Type 2 SPD included
  • IP40 metal enclosure
  • BS 7671 Section 722 compliant
Buy — £85.00 →
Multiple Tesla Wall Connectors · 3-Phase PME supply · £185

Tesla 3-Phase PME Board — Multiple Chargers

IP40 metal enclosure. PEN fault detection + multiple 40A RCBOs + SPD in a larger enclosure for multi-charger installs. Covers multiple Tesla Wall Connectors or mixed 3-phase EV chargers on a single PME-protected supply. Most cost-effective solution for 2+ charger sites.

  • PME/PEN fault detection — 3-phase rated
  • Multiple 40A RCBOs (for multiple charger circuits)
  • Type 2 SPD included
  • IP40 metal enclosure
  • Covers 2+ Wall Connectors from one board
Buy — £185.00 →

Single-Phase Tesla Installs

Single-phase PME · Outdoor · IP65 · £68.25

PME Consumer Unit IP65 — 40A RCBO + SPD

Weatherproof IP65 plastic enclosure. PEN fault detection + 40A RCBO + SPD. Best choice for an outdoor single-phase Tesla Wall Connector where the board is mounted externally or in an exposed location.

Buy — £68.25 →
Single-phase PME · Indoor · IP40 · Load balancing · £88

PME Consumer Unit IP40 — RCBO + SPD + Load Balance

Metal IP40 enclosure. PEN fault detection + RCBO + SPD + load balancing relay. Best choice where the supply capacity needs managing — particularly where a heat pump, EV charger, and other high-draw loads share a limited supply.

Buy — £88.00 →

Single-Phase vs Three-Phase Tesla Charging — Which to Install?

Factor Single-Phase (7.4kW) Three-Phase (11–22kW)
Max charge rate 7.4kW (32A) Up to 22kW (32A per phase)
Miles added per hour ~25–30 miles/hr ~75–80 miles/hr at 22kW
Supply requirement Standard single-phase domestic 3-phase supply at the property
Install complexity Standard domestic install More complex — 3-phase protection required
PME board required Standard single-phase WCED board 3-phase PME board (different product)
Suitable for Most homes, overnight charging High mileage, commercial, properties with 3-phase

For most UK homeowners: single-phase at 7.4kW is more than sufficient. A full charge from empty on a typical Tesla Model 3 (75kWh) takes around 10 hours overnight — plugged in every evening, the car is always full in the morning. Three-phase makes sense for high-mileage drivers, commercial contexts, or properties that already have a 3-phase supply.

Multi-Charger Tesla Installs — Houses & Commercial

Properties with multiple Tesla vehicles, or commercial locations with multiple charging bays, need a different approach to protection.

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Two Tesla vehicles, one property

The most common multi-charger scenario. Two Wall Connectors can share a single 3-phase PME board — significantly cheaper than two separate boards. Tesla’s Power Sharing feature also allows the Wall Connectors to share available current automatically.

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Small commercial sites

Offices, hospitality venues, car parks with 2–4 Tesla Wall Connectors. The multi-charger 3-phase PME board covers all circuits from a single point of protection. Above 4 chargers, a TPN distribution board becomes the more practical solution.

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Mixed fleet (Tesla + other brands)

Where the site has Tesla Wall Connectors alongside other brand 3-phase chargers, the same 3-phase PME board covers all circuits. Protection requirements don’t change by charger brand.

Common Installation Questions — Tesla & PME

Does Tesla manufacture their own PME protection device?
No. Tesla does not supply a PME protection device with the Wall Connector. The installer is responsible for providing appropriate BS 7671 Section 722 compliant protection. EcoHarmony’s Tesla-specific 3-phase PME boards are designed for exactly this purpose.
Does the Tesla Wall Connector have built-in RCD protection?
The Gen 3 Wall Connector includes an internal RCD. However, this does not replace the external Type A RCBO required at the consumer unit under BS 7671, nor does it provide PME/PEN fault detection. All protection layers are still required in the wiring installation, regardless of what the charger unit itself contains.
Can I use a single-phase PME board for a 3-phase Tesla install?
No. A single-phase PME board only monitors the single-phase supply. A 3-phase supply has three live conductors, and PEN fault detection needs to monitor all three phases to be effective. Using a single-phase device on a 3-phase install does not meet BS 7671 Regulation 722.411.4.1 and is not compliant.
What is Tesla Power Sharing and how does it affect protection?
Tesla Power Sharing allows multiple Wall Connectors connected via Ethernet or WiFi to share the available supply current — so two chargers each get up to 50% of available power rather than both trying to draw full current simultaneously. Power sharing is a software feature of the charger. It doesn’t change the protection requirements — each charger circuit still needs its own RCBO, and PME protection covers the supply to all chargers.
Does Tesla Wall Connector need an SPD (surge protection device)?
Yes. BS 7671 Appendix 16 requires a Type 2 SPD for EV charger installations where a risk assessment determines one is required — and for outdoor or exposed installations, the risk assessment almost always determines that one is. All EcoHarmony Tesla PME boards include a Type 2 SPD as standard.
What cable size do I need for a Tesla Wall Connector?
For a single-phase 32A Wall Connector: typically 6mm² two-core + earth, subject to installation method and circuit length. For a 3-phase install: typically 6mm² four-core + earth (one core per phase plus neutral and earth), subject to the same factors. Cable sizing must be confirmed by the installing electrician based on the specific installation conditions.
Is the Tesla Wall Connector OZEV approved?
Yes. The Tesla Wall Connector Gen 2 and Gen 3 are OZEV approved and eligible for applicable government grant schemes. Installation must be carried out by a registered installer under the relevant scheme terms.
My property has a 3-phase supply. Can I charge at 22kW?
The Wall Connector supports up to 22kW on three-phase. However, the vehicle must also support three-phase charging — not all Tesla models do, or they may be limited to 11kW (16A per phase). Check your specific vehicle’s onboard charger specification. The Tesla Model 3 Long Range and Performance support 11kW three-phase; some configurations support more.
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EcoHarmony — Tesla PME boards UK-stocked and ready to dispatch

We stock both the single-charger and multi-charger Tesla 3-phase PME boards, plus the full range of single-phase WCED boards for standard domestic Tesla installs. All pre-assembled, tested, and ready to install.

  • 🧠 Technical advice on which board suits your specific install
  • 💷 Trade pricing — volume discounts from 5+ units
  • 📦 OEM pricing for installers doing regular Tesla installs
  • 🚚 Same-day dispatch on all stock lines

Ready to specify protection for a Tesla install?

Single or multi-charger. Single or three-phase. We have the board for it.

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Technical Glossary

PME / TN-C-S
Protective Multiple Earthing — UK supply configuration where neutral and earth are combined in the supply conductor. Present in ~80% of UK properties. Requires specific EV charger protection under BS 7671.
PEN fault
A break or high-resistance connection in the combined protective earth/neutral (PEN) conductor of a PME supply. Can raise exposed metalwork to a dangerous voltage. PEN fault detection monitors for this condition and disconnects the circuit automatically.
WCED board
Whole Current Earth Detector — pre-assembled protection board containing PEN fault detection, RCBO(s), and SPD. Provides all required BS 7671 Section 722 protection layers in a single enclosure.
RCBO
Residual Current Breaker with Overcurrent protection — combines RCD and MCB in a single device. Required on EV charger circuits under BS 7671. Type A minimum for EV chargers.
SPD
Surge Protection Device — protects charger and vehicle electronics from voltage spikes on the supply. Type 2 SPD required for outdoor EV charger installations per BS 7671 Appendix 16.
Three-phase supply
Electrical supply with three live conductors (L1, L2, L3) at 400V between phases. Allows higher power delivery (up to 22kW for EV charging) compared to single-phase (max 7.4kW). Available at some domestic and most commercial properties.
TPN
Three-Pole and Neutral — distribution board or switching arrangement handling three-phase and neutral circuits. Used in commercial multi-charger installations requiring sub-mains distribution.
Tesla PME boards — single & multi-charger UK-stocked · From £85 · Same-day dispatch
Single Charger — £85 Multi-Charger — £185

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