Summary:
Choosing the right 3-phase distribution board can make or break an EV installation. This guide walks through the key considerations, from current ratings to surge protection and layout efficiency, helping installers make compliant, cost-effective choices for every site.
Why 3-Phase Distribution Boards Matter in EV Installations
As EV charging expands into commercial and multi-charger setups, 3-phase power distribution is becoming standard.
A reliable 3-phase distribution board ensures balanced load management, proper protection, and compliance with BS 7671.
Using a well-designed board saves time, reduces cabling complexity, and simplifies fault-finding — key benefits for busy installers.
What to Look for in a 3-Phase Distribution Board
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Amperage Rating:
Match the main switch to the total current demand. For most EV installations, a 125A main switch is a reliable choice. -
Protection Devices:
Ensure compatibility with 10kA MCBs or RCBOs for overcurrent and fault protection. -
Surge Protection:
Under the 18th Edition Amendment 2, surge protection is required unless a documented risk assessment says otherwise.
The Type 2 SPD integrated into boards like the WCED TPN Distribution Board + SPD offers a compliant and space-efficient solution. -
Build Quality:
Choose boards with a sturdy metal IP-rated enclosure (IP30 minimum). This ensures long service life and safer operation.
Recommended Setup for EV Installers
For multi-charger installations — especially Tesla or Zappi — a TPN board with RCBO or MCB protection is ideal.
It allows clean, scalable wiring for multiple chargers and simplifies isolation per circuit.
Eco Harmony’s WCED TPN Distribution Board + SPD includes:
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✅ 4P 125A main switch
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✅ Type 2 Surge Protection Device
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✅ Full compatibility with WCED MCBs and RCBOs
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✅ A solid metal IP30-rated enclosure
Save 25% on MCBs
When you purchase MCBs alongside a WCED TPN Distribution Board, you’ll receive 25% off all MCB units — making it more affordable to kit out full EV charging installations.
Shop compatible devices:
Installation Tips
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Keep neutral links tidy for ease of inspection.
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Label all circuits clearly, especially where multiple chargers are connected.
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Always verify surge protection status indicators.
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For outdoor or exposed areas, upgrade to an IP65-rated board if needed.
Conclusion
The right 3-phase distribution board keeps EV installations neat, compliant, and scalable.
By choosing a pre-fitted unit with a main switch, SPD, and compatible protection devices, installers can save hours on-site while delivering a professional finish.
👉 Explore 3-Phase Distribution Boards:
https://ecoharmony.co.uk/collections/3-phase-distribution