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Three Phase Distribution Boards

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FuseBox | HTPNSF0100 | Horizontal TPN Fused Switch | 3 x 100A gG Fuses

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SKU: HTPNSF0100
£85.95
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Showing 101–101 of 101 results

Three Phase Distribution Boards and TPN Boards

Our range of three phase distribution boards covers electrical distribution requirements for commercial buildings, workshops, warehouses and industrial premises. Also known as 3 phase DBs, three phase fuse boards or TP&N distribution boards, these products are available in various configurations to suit different installations.

Choosing the Right Three Phase Distribution Board

When choosing a distribution board, consider the number of outgoing circuits, incoming supply rating, protective devices and available installation space. Our range includes main switch TP&N boards, distribution boards with surge protection (SPD), horizontal configurations, unpopulated enclosures and compatible accessories.

How Many Circuits Can a Three Phase Distribution Board Accommodate?

One common misunderstanding when selecting a three phase distribution board is the number of ways. Unlike a standard single phase consumer unit, a TPN distribution board is normally rated by the number of three pole ways, with each way providing positions across all three phases.

For example, a 4 way three phase distribution board can typically accommodate four 3 pole MCBs, twelve standard single pole MCBs or a suitable combination of both. A 4 way TPN board does not simply mean four single pole circuit positions.

  • 2 Way TPN Board – Up to 2 three pole or 6 single pole positions.
  • 4 Way TPN Board – Up to 4 three pole or 12 single pole positions.
  • 6 Way TPN Board – Up to 6 three pole or 18 single pole positions.
  • 8 Way TPN Board – Up to 8 three pole or 24 single pole positions.
  • 12 Way TPN Board – Up to 12 three pole or 36 single pole positions.
  • 16 Way TPN Board – Up to 16 three pole or 48 single pole positions.

These figures assume standard single-module-width single pole devices. Actual capacity depends on the manufacturer’s board design, protective device width, phase arrangement and compatibility. Always check the manufacturer’s specifications before selecting MCBs, RCBOs or other protective devices.

Using a Three Phase Distribution Board for Single Phase Installations

Selected three phase distribution boards can also be used for single phase installations, but only where the manufacturer specifically approves this arrangement and provides a compatible single phase conversion kit for the particular board model.

Manufacturer-approved single phase conversion kits for selected boards can be found within the relevant product ranges and accessories in this category. Never mix conversion kits, busbars or components from different manufacturers or incompatible product ranges. Always follow the manufacturer’s instructions and verify compatibility before installation.

Main Switch, SPD and Horizontal TPN Distribution Boards

Main switch TPN boards provide arrangements for three phase distribution with a suitable main incomer. SPD distribution boards incorporate surge protection for applications requiring protection against transient overvoltages, while horizontal TP&N boards offer alternative enclosure arrangements where installation space or mounting requirements make them preferable.

Choose protective devices, incomers and accessories approved for the specific manufacturer’s distribution board range. Components from different manufacturers or incompatible ranges should not be assumed interchangeable.

Meter Tails, Cable Entry Glands and Installation Accessories

When installing a three phase distribution board, selecting the correct cable entry accessories is important. If meter tails enter the enclosure directly, browse our meter tails glands, including options for single phase and three phase cable arrangements. The correct gland depends on the cable configuration, conductor sizes and installation requirements.

We also stock a selection of meter tails, including flexible options that can make routing and termination easier in restricted spaces. Always check that the selected cable and terminals are compatible and suitable for the installation.

Three Phase Distribution Board Brands

Electrical4Less supplies three phase distribution boards and compatible accessories from Hager, FuseBox, Live Electrical, Niglon, WCED (Whitecliffe) and GARO. Explore individual products for specifications, pricing, stock availability and delivery information.