3 Phase Distribution Board Spreader Box
£50.80
£55.00
18th Ed. Compliant
2-Year Warranty
UK Stock
Free Delivery £30+
Secure Payments With
The WTPNSB 3 Phase Spreader Box is designed to support safe cable management and heat dissipation in three-phase distribution board installs. Used to separate conductors and maintain airflow, this add-on accessory reduces thermal build-up on high-current terminations and makes wiring tidier and safer for future maintenance. Ideal for commercial and...
The WTPNSB 3 Phase Spreader Box is designed to support safe cable management and heat dissipation in three-phase distribution board installs. Used to separate conductors and maintain airflow, this add-on accessory reduces thermal build-up on high-current terminations and makes wiring tidier and safer for future maintenance.
Ideal for commercial and industrial sites, this spreader box is fully compatible with the Whitecliffe WTPN range and can be fitted alongside your existing 3 phase TPN board.
- Distributes cables evenly across terminals to reduce heat build-up
- Built-in terminal bars for secure and consistent terminations
- Compatible with WTPN boards from Whitecliffe (top or bottom fit)
- Robust TPN pan and shrouded terminals for safety and durability
- 125A rated with secure busbar ends – ready for demanding installs
This unit helps improve compliance with BS EN 61439-3 by ensuring safer termination zones and better thermal performance in three-phase systems. For a complete setup, pair with our MCBs, RCBOs, and SPDs.
What is a spreader box used for?
A spreader box is used to distribute and organise cable terminations in a 3 phase board. It helps reduce overheating by spacing load-bearing conductors and improving ventilation.
Is this compatible with non-Whitecliffe boards?
It’s designed for the WTPN range. It may fit other boards of similar dimensions, but always check mechanical compatibility before install.
Do I need a spreader box for every 3 phase board?
Not always – but for high-current installs or where terminations are tight, they offer clear thermal and organisational benefits that support long-term safety and 18th Edition compliance.
What else should I use with a spreader box?
Spreader boxes are typically installed alongside MCBs, RCBOs, and surge protection devices within a three-phase system to deliver a safe, regulation-ready setup.
- Rated Current: 125A
- Compatible Boards: WTPN series 3 Phase TPN boards
- Terminal Bars: Large terminal bar on both sides
- Busbar Cover: Enclosed unibody with end protection
- Mounting: Top or bottom position on enclosure
- Material: 1.2mm steel body with powder-coated finish
- Standard: BS EN 61439-3 compliant
This spreader box is designed for use with WTPN three-phase boards to improve cable layout and reduce termination temperatures under load. Fit by a qualified electrician only.
- Positionable at top or bottom of compatible board
- Use with included terminal bars for structured layout
- Ensure all connections are torque-tested and shrouded
- Check busbar and neutral bar alignment before powering up
