Free Delivery on all orders over £99*

IP68 16A 3-Way Weatherproof Junction Box - Clear Polycarbonate

£999
The RRP is the manufacturer's recommended retail price of the item.
390 In Stock - Ready to Ship
We are an Independent UK Company
Price match. Found it cheaper? Contact us
Trade Discount Available
Description

The Knightsbridge JB004 is an IP68 rated 3-way junction box designed for permanent outdoor and underwater cable connections up to 16A at 450V. The clear polycarbonate housing contains a 3-terminal strip connector fixed inside, with three cable entry ports sealed by black threaded glands. Each gland accepts cable diameters from 5mm to 10mm, covering H07RNF 3-core flex from 0.75mm² to 4.0mm² cross-section.

Built for garden lighting circuits, pond pumps, outdoor security cameras and external sensors, the junction box provides a waterproof method of extending cable runs, repairing damaged outdoor cables, or splitting a power feed to multiple devices. The IP68 rating certifies submersion resistance to 2 bar pressure, making the box suitable for underwater installation in ponds, water features and irrigation systems as well as above-ground outdoor use. The polycarbonate housing resists UV degradation and impact damage better than standard ABS junction boxes.

The silicon sealing gasket between the lid and base compresses when the six Phillips-head screws are tightened, creating a continuous waterproof seal around the perimeter. Inside, the 3-terminal strip uses screw terminals to clamp each conductor, allowing cables to be connected and disconnected for maintenance without cutting. The clear housing allows visual inspection of connections without opening the box. The unit is certified to EN 50262 and rated T85 for ambient temperatures up to 85°C.

Specification
Length 121 mm
Width 72 mm
Projection 35 mm
Construction Polycarbonate
Finish Clear
IP Rating IP68
Warranty 2
Downloads

Product Specification Sheet

Product Manual

Frequently Asked

What does IP68 mean in practice?

IP68 certifies the junction box is dust-tight (the '6') and can withstand continuous submersion in water (the '8'). This specific box is rated to 2 bar pressure, equivalent to approximately 20 metres water depth, making it suitable for pond installations, underground cable runs and permanent outdoor exposure.

What cable sizes does it accept?

Each of the three cable glands accepts cables from 5mm to 10mm outer diameter. This covers H07RNF 3-core flexible cable from 0.75mm² to 4.0mm² cross-sectional area. Thinner or thicker cables will not seal properly in the glands.

Can the box be opened for maintenance?

Yes. The six Phillips-head screws securing the lid can be removed to access the terminal strip inside. When reassembling, ensure the silicon gasket sits cleanly in its channel and tighten all six screws evenly to maintain the IP68 seal.

Is it suitable for mains voltage outdoor lighting?

Yes. The 16A 450V rating covers standard 230V mains circuits. The junction box is commonly used for extending garden lighting runs, connecting outdoor sockets and linking security lighting to mains supply cables buried in garden borders.

Shipping & Returns

Delivery UK delivery is £14.99, and delivery is free on all orders of £99 or more, in the UK and internationally.

Returns If you change your mind, you have 14 days from delivery to tell us, and a further 14 days to send the goods back. Return postage for a change-of-mind return is paid by you. Change-of-mind returns are subject to an inspection and handling deduction. See our full returns policy.

To arrange a return, call us on 020 8149 5199 or use our contact page.

See it lit, in person

Lighting looks different in a real room. Come and see our range at our showrooms in Birmingham, Hong Kong and Dubai, or talk to our design team wherever you are.

Niori lighting showroom trailer video with closeups of alabaster lighting

Why Niori

Over 20 years lighting homes worldwide

We are a specialist lighting and mirror retailer with showrooms in Birmingham, Hong Kong and Dubai, shipping to customers around the world. Our own design team is here to help, from first idea to final fitting.

Genuine products

An authorised stockist

Every product arrives brand new with the full manufacturer warranty. Found it cheaper elsewhere? Ask us about a price match.

Ordering with us

Free delivery over £99

Free delivery on orders over £99, in the UK and worldwide. Easy returns within 14 days, subject to our returns policy. Full manufacturer warranty included.

Design help

Not sure what you need?

Our design team can help you plan your lighting, share photos and videos of stock, and send samples worldwide. Book a showroom visit in Birmingham, Hong Kong or Dubai, or ask about our lighting design service.

You Might Also Like

Recommended For You

    Our Reviews

    From first click to final installation, our customers share how Niori lights up their spaces. Read their words and envision what’s possible for yours.

    Featured Projects

    Step into our portfolio and see how we transform homes, restaurants, and commercial spaces and more, worldwide. Click here for a closer look at our latest projects.

    Description

    The Knightsbridge JB004 is an IP68 rated 3-way junction box designed for permanent outdoor and underwater cable connections up to 16A at 450V. The clear polycarbonate housing contains a 3-terminal strip connector fixed inside, with three cable entry ports sealed by black threaded glands. Each gland accepts cable diameters from 5mm to 10mm, covering H07RNF 3-core flex from 0.75mm² to 4.0mm² cross-section.

    Built for garden lighting circuits, pond pumps, outdoor security cameras and external sensors, the junction box provides a waterproof method of extending cable runs, repairing damaged outdoor cables, or splitting a power feed to multiple devices. The IP68 rating certifies submersion resistance to 2 bar pressure, making the box suitable for underwater installation in ponds, water features and irrigation systems as well as above-ground outdoor use. The polycarbonate housing resists UV degradation and impact damage better than standard ABS junction boxes.

    The silicon sealing gasket between the lid and base compresses when the six Phillips-head screws are tightened, creating a continuous waterproof seal around the perimeter. Inside, the 3-terminal strip uses screw terminals to clamp each conductor, allowing cables to be connected and disconnected for maintenance without cutting. The clear housing allows visual inspection of connections without opening the box. The unit is certified to EN 50262 and rated T85 for ambient temperatures up to 85°C.

    Specification
    Length 121 mm
    Width 72 mm
    Projection 35 mm
    Construction Polycarbonate
    Finish Clear
    IP Rating IP68
    Warranty 2
    Downloads

    Product Specification Sheet

    Product Manual

    Frequently Asked

    What does IP68 mean in practice?

    IP68 certifies the junction box is dust-tight (the '6') and can withstand continuous submersion in water (the '8'). This specific box is rated to 2 bar pressure, equivalent to approximately 20 metres water depth, making it suitable for pond installations, underground cable runs and permanent outdoor exposure.

    What cable sizes does it accept?

    Each of the three cable glands accepts cables from 5mm to 10mm outer diameter. This covers H07RNF 3-core flexible cable from 0.75mm² to 4.0mm² cross-sectional area. Thinner or thicker cables will not seal properly in the glands.

    Can the box be opened for maintenance?

    Yes. The six Phillips-head screws securing the lid can be removed to access the terminal strip inside. When reassembling, ensure the silicon gasket sits cleanly in its channel and tighten all six screws evenly to maintain the IP68 seal.

    Is it suitable for mains voltage outdoor lighting?

    Yes. The 16A 450V rating covers standard 230V mains circuits. The junction box is commonly used for extending garden lighting runs, connecting outdoor sockets and linking security lighting to mains supply cables buried in garden borders.

    Shipping & Returns

    Delivery UK delivery is £14.99, and delivery is free on all orders of £99 or more, in the UK and internationally.

    Returns If you change your mind, you have 14 days from delivery to tell us, and a further 14 days to send the goods back. Return postage for a change-of-mind return is paid by you. Change-of-mind returns are subject to an inspection and handling deduction. See our full returns policy.

    To arrange a return, call us on 020 8149 5199 or use our contact page.