If you’re installing EV charge points on a PME (TN-C-S) supply in 2026, you’ve probably asked it - or been asked it:
“Do I actually need PEN fault protection on this job?”
The answer depends on the earthing arrangement, where the charger is located, and how the install is configured. This guide breaks it down in plain installer terms - what the 18th Edition expects in 2026, when protection is required, and what your compliant options are.
Quick Answer: In 2026, PEN fault protection is typically required when installing EV charge points on a PME (TN-C-S) supply where the installation could create a dangerous touch voltage in the event of an open PEN. If you’re exporting PME outdoors, or installing an EV charger externally, you’ll usually need either PEN fault detection or another compliant method of protection.
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Why PEN Protection Is a Focus on PME Supplies
On a TN-C-S (PME) supply, the earth and neutral share a combined conductor upstream. If that PEN conductor fails, exposed metalwork connected to PME earth can rise in potential.
Inside a bonded building, risk is reduced because everything is at the same reference. Outdoors, it’s different.
- EV chargers are typically external.
- Users are often standing on true earth.
- Vehicle bodywork becomes part of the equation.
That combination is why EV installs on PME supplies receive specific attention under BS 7671.
When PEN Fault Protection Is Required (2026)
In practical terms, you should expect PEN protection to be required when:
- The EV charge point is installed outdoors on a PME supply.
- The install effectively exports PME earth outside the building’s equipotential zone.
- The charger does not include an integrated compliant open PEN detection method.
Regulation Reminder: BS 7671 requires protection against electric shock in the event of a supply PEN conductor failure where a dangerous touch voltage could occur. The regulation does not say “fit this exact device,” but it requires a compliant method of protection appropriate to the installation.
If you’re installing a standard outdoor EV charger on PME in 2026, assume you’ll need either:
- A device with built-in open PEN detection, or
- A dedicated PEN/PME fault detection unit, or
- An alternative compliant earthing arrangement.
When PEN Protection May Not Be Required
There are scenarios where additional PEN detection may not be necessary:
- The property is on a TT supply.
- The EV charger includes certified, compliant open PEN detection internally.
- A fully compliant alternative earthing method is used and correctly designed.
This is where reading the charger manufacturer’s installation instructions becomes critical. Some EVSE units already integrate detection - some do not.
Compliant Protection Options in 2026
Installers generally choose one of three approaches:
- Integrated EV charger detection – Built-in open PEN monitoring.
- Dedicated PME fault detection board – Separate enclosure handling detection and isolation.
- Alternative earthing arrangement – Such as TT conversion where appropriate.
For many domestic installs, a dedicated PME board keeps the compliance layer clear and avoids ambiguity during inspection.
Choosing the Right PME Fault Detection Unit
When selecting a unit, consider:
- Single-phase or three-phase supply
- SPD requirement (often required under Amendment 2)
- RCBO vs MCB configuration
- IP rating for external installs
Installer Shortcut: A pre-built PME fault detection board with SPD and RCBO included keeps the install straightforward and inspection-friendly.
PEN Fault Protection Units for 2026 EV Installs
If PEN protection is required on your job, choose a board matched to the supply and charger rating:
Single-Phase Domestic EV (Most Common):
👉 IP65 PME Consumer Unit – 40A Type A RCBO + SPD
👉 IP65 PME Consumer Unit – 40A Type A RCBO (No SPD)
Three-Phase / Commercial EV Installations:
👉 3-Phase PME Fault Detection Unit – 40RSP
👉 3-Phase PME Fault Detection Unit – 63A with SPD
All units provide monitored disconnection in the event of supply PEN failure on TN-C-S (PME) systems.
FAQs
Quick answers to the common compliance questions in 2026.
Is PEN fault protection mandatory by law?
It’s not a standalone “law,” but BS 7671 requires protection against dangerous touch voltage in the event of a PEN failure where risk exists.
Do all EV chargers have built-in PEN detection?
No. Some do, some don’t. Always check the manufacturer’s specification.
Can I just fit an earth rod instead?
Not automatically. Alternative earthing methods must be properly designed and compliant for the installation.
Final Word
In 2026, if you’re installing an outdoor EV charger on a PME supply, assume PEN protection will be part of the job unless you’ve clearly designed an alternative compliant solution.
- Understand the earthing system.
- Check the EV charger specification.
- Use a compliant protection method.
👉 Ready to spec? Browse PME Fault Detection Units for 2026 installs.