MacArtney oil-filled junction box

The MacArtney oil-filled junction box is a robust, reliable junction box designed for underwater applications. It is specially engineered to withstand harsh marine environments and ensure reliable electrical connections.

As a standard, the junction box is built of hard-anodised aluminium and has a polycarbonate lid with a stainless steel frame serving as a front-cover protection. It comes in three sizes - Size A3, A4 & A5.

The oil-filled environment inside the junction box helps equalise the pressure between the internal components and the external water pressure, preventing damage to the box due to pressure differentials.

The oil-filled junction box is designed for use alongside an oil compensator to further enhance its performance and suitability in underwater installations. In the event of a leak, it effectively prevents water ingress by maintaining a slight overpressure of 0.5 bar within the junction box while ensuring balanced pressure, thereby preventing excessive oil expansion or contraction.

Additionally, the 1.2 L oil compensator has the option to notify if the oil level drops below the required level and signal the users of a potential leak in the junction box.

Features and benefits

• Waterproof submersible design for reliable performance in underwater environments
• The customer-designed layout of SS connector plates
• Durable construction with corrosion-resistant materials to withstand marine conditions
• A more cost-effective alternative for the FITA (Field installable termination assembly)
• Compatible with a wide range of cables, connectors, and underwater equipment, providing flexibility in system integration
• Allows for easy visibility of internal components, facilitating maintenance, troubleshooting, and repair activities
• The integrated 10 psi overpressure valve ensures that the internal pressure does not exceed safe limits
• The inclusion of two bleed valves provides efficient air release and helps maintain optimal pressure within the junction box

• Subsea oil and gas installations
• Marine research and exploration
• Underwater remote operated vehicles (ROVs)
• Offshore renewable energy projects

• Oil compensator 0.25, 0.58 & 1.2 L
• Oil compensator 1.2 L with sensor
• In-house machining of the connectors/gland placement
• Mounting brackets for the junction box

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