3 Phase Extension Board 14 Module
18th Ed. Compliant
2-Year Warranty
UK Stock
Free Delivery £30+
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The WTPNEB14 14-Module 3 Phase Extension Board is part of the Whitecliffe WTPN range, designed to expand existing 125A three-phase distribution systems. Built in a robust 1.2mm steel enclosure, it’s ideal for commercial, industrial, and larger domestic installs where additional outgoing ways are needed without replacing the main board. Compatible...
The WTPNEB14 14-Module 3 Phase Extension Board is part of the Whitecliffe WTPN range, designed to expand existing 125A three-phase distribution systems. Built in a robust 1.2mm steel enclosure, it’s ideal for commercial, industrial, and larger domestic installs where additional outgoing ways are needed without replacing the main board.
Compatible with WTPN three-phase boards and accepting 6kA MCBs and RCBOs without modification, this extension board provides a fast, cost-effective way to increase circuit capacity while maintaining compliance with BS EN 61439-3 and the 18th Edition Wiring Regulations.
- 14-module capacity – adds space for extra MCBs or RCBOs
- Compatible with 125A WTPN boards
- Heavy-duty steel enclosure – long service life in demanding installs
- Fully enclosed busbar system with shrouded terminals
- Neutral & earth terminals fitted both sides
- Removable gland plate for easy cable entry
- Keyhole mounting for quick wall installation
For a complete setup, pair this extension with Type 2 SPDs and PME fault detection units to meet current EV, solar, and renewable compliance requirements.
Can this be used on any three-phase board?
It’s designed specifically for the Whitecliffe WTPN distribution board range. Always check compatibility before purchase.
What’s the benefit of using an extension board?
It allows you to add extra outgoing ways for MCBs and RCBOs without replacing the main board – saving both cost and time.
Is this extension board surge protected?
No – surge protection is provided within the main board. If you need additional protection, see our surge protection devices.
What else should I install with this?
For full compliance on EV, solar, or renewable installs, we recommend combining with PME protection and individual RCBOs for each circuit.
- Model: WTPNEB14
- Type: 3 Phase Extension Board
- Module Count: 14
- Rated Current: 125A (system compatible)
- Material: 1.2mm steel, IP-rated
- Device Compatibility: Accepts 6kA-rated MCBs/RCBOs without modification
- Compliance: BS EN 61439-3
Install only by a qualified electrician. The extension board is designed for use with WTPN three-phase boards and should be mounted in a dry, ventilated location.
- Ensure compatibility with existing board before ordering
- Follow wiring diagram for busbar and terminal connections
- Maintain correct cable dressing for accessibility
