Collingwood JB2 (Series) Waterproof Junction Box

One Box, Three Ways to Extend Your Run

The Collingwood JB2 is a waterproof junction box built for one job: joining outdoor LED fittings together so they can run in series from a single power supply. It takes one input and splits it into up to three outputs, and it is rated to go underground without any special protection of its own.

A Compact Sealed Housing

The JB2 has a small plastic housing measuring 95mm by 95mm by 30mm, moulded around four cable glands so each connection stays fully sealed once it is wired up. It is rated IP68 and submersible to 2m, which is what lets it be buried directly in soil or set into paving alongside the fittings it connects.

How It Works

• One input feeds the box, which then splits the supply across up to three outputs
• Designed for series wiring of constant current LED products, not for general mains wiring
• Only intended for use with fittings wired using H05RN-F cable
• Where a run needs to go further, additional JB2 boxes can be linked in a chain, up to the total capacity of the LED driver feeding them

Where It Works Best

This is the box you reach for when a run of ground lights or spike lights needs to branch, and the cable has to disappear into the landscape rather than sit on top of it. Because it is sealed and rated for burial, it suits paths, decking edges and planting borders where you want the wiring hidden below the surface rather than routed through an exposed enclosure. Before ordering, it is worth checking that the outdoor fittings on that circuit are wired with H05RN-F cable, since the JB2 is built around that specification.

Built by Collingwood Lighting

Collingwood Lighting has specialised in LED technology since 2002, designing and manufacturing its products from Sywell, Northamptonshire. Connectors like the JB2 sit alongside its constant current LED ranges, and the brand states it was among the first to bring fully waterproof, sealed for life LED products to the UK electrical wholesale market, an approach that carries through to how its outdoor wiring accessories are built. Collingwood has also been awarded a Gold medal by EcoVadis, placing it in the top 5% of companies assessed globally for sustainability.

Good to Know

• Rated IP68, submersible to 2m, so it can be buried or set into paving
• Comes with a 1 year guarantee
• Housing is plastic, weighing around 0.1kg
• For use with constant current LED products wired in series using H05RN-F cable only
• Moonlight Design recommends installation by a registered NICEIC electrician, particularly as this is typically fitted outdoors or underground

Questions People Ask

How many outdoor fittings can I connect through one JB2?
The JB2 has one input and up to three outputs, and further JB2 boxes can be chained together if a run needs more connections, as long as the total stays within the capacity of the LED driver supplying the circuit.

Can the JB2 be buried underground?
Yes. It is rated IP68 and submersible to 2m, which means it can be buried directly in soil or set into paving without additional protection.

What cable does the JB2 need to be used with?
The JB2 is only intended for use with fittings wired using H05RN-F cable, so it is worth checking the cable type on your outdoor fittings before ordering.

Is the JB2 suitable for mains wiring?
No. It is designed specifically for series wiring of constant current LED products, not general mains electrical connections.

95mm height x 95mm width x 30mm depth

• Collingwood Residential Accessories Guide 2025

We offer free standard delivery on orders within the UK Mainland* (an additional fee applies for the Isle of Wight, the Isle of Man, the Scottish Isles, parts of Scotland, Northern Ireland, the Republic of Ireland, the Channel Isles and International).

*Collingwood orders under £150 incur a delivery fee of £9.95 inc. VAT.
*Any order under £49 incurs a delivery fee of £9.95.