Summary:
Choosing the right 3-phase distribution board is one of the most important steps in any commercial EV installation. The right setup keeps your installation tidy, compliant, and ready for future load expansion. In this post, we’ll explain what to look for, the key features that matter, and how Eco Harmony’s WCED 3-phase boards make installation easy and cost-effective.
Why 3-Phase Distribution Boards Matter for EV Chargers
As more businesses and fleet operators install multiple EV chargers, 3-phase power is becoming the standard.
A 3-phase distribution board (also known as a TPN board) gives you:
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✅ Even load distribution across phases
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✅ Space to manage multiple chargers
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✅ Centralised protection and surge management
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✅ Easy future expansion
Whether you’re wiring a car park, commercial site, or apartment block, choosing the right TPN board ensures your system is both compliant and reliable.
What To Look For in a 3-Phase EV Distribution Board
When specifying or purchasing, consider:
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Main Switch Rating – Choose a board with a 125A 4-pole main switch for flexibility and safety.
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Surge Protection (SPD) – Protects chargers and connected systems from overvoltage events.
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RCBO / MCB Compatibility – Boards that support modular protection make maintenance easy.
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Build Quality & IP Rating – For indoor EV setups, IP30 is usually ideal.
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Ease of Installation – Removable gland plates, labelled busbars, and pre-configured layouts save time on site.
The Eco Harmony WCED TPN Distribution Board Range
Eco Harmony stocks a range of WCED 3-phase distribution boards, purpose-built for EV and renewable installations.
🔹 TPN Distribution Board c/w 4P 125A Main Switch + 4P SPD
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Includes Type 2 surge protection
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Supplied with a 4-pole 125A main switch
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Clean layout, reliable build, easy wiring
🧰 Pair it with:
💡 Installers save 25% on MCBs when purchased with a WCED TPN Board!
These boards are widely used in EV charging bays, small commercial installations, and solar inverter distribution setups, offering a professional, compact, and affordable solution.
Installation and Compliance Tips
To ensure BS 7671 compliance and long-term reliability:
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Fit the board as close as possible to the supply origin.
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Ensure all outgoing circuits are protected by RCBOs or MCBs.
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Always use Type 2 SPD if connecting to external equipment like chargers or PV systems.
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Label phases clearly for future maintenance.
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Verify tightening torques and record results in your Electrical Installation Certificate.
Why Installers Choose Eco Harmony
Installers across the UK choose Eco Harmony’s distribution boards because they’re:
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Built to UK standards and specifications
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Supplied pre-configured with main switch and SPD
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Supported by fast delivery and technical help
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Priced fairly — with discounts for trade orders
Final Thoughts
The right 3-phase board makes or breaks an EV installation.
By combining surge protection, quality build, and flexible modular protection, Eco Harmony’s WCED boards are the smart choice for installers who value reliability and simplicity.
👉 Explore the full WCED range here:
https://ecoharmony.co.uk/collections/3-phase-distribution