Tunnel Junction Box
Specialised in branch cable joints for 20 years
Insulated, flame retardant, fire resistant, waterproof, wide range of uses
Suitable for main cable 35~95mm, branch cable 2.5~35mm
Rated voltage 0.6/1kV
Advanced technology, reusable
No need to cut the main cable, no need to reserve lengths
Flexible installation position
Saves 2-3 metres of main cable, labour costs and time
Complies with international safety and security standards and GB/T 14048.7-2016.....
Low overall cost, high cost performance."
Tunnel Junction Box: Professional Cable Connection Solution for Underground & Tunnel Applications
OUKAMU's Tunnel Junction Box delivers enterprise-level performance for low-voltage power distribution systems in demanding underground environments. The Model ZR-JFZ-95/35 supports main cables from 35~95mm² and branch cables from 2.5~35mm², with a rated voltage of 0.6/1kV. This innovative solution eliminates the need to cut main cables, saving 2-3 meters of cable per connection while reducing installation time by up to 40%. Backed by over 150 national invention patents and proven in 10,000+ infrastructure projects, our cable joint system ensures safe, reliable connections that comply with GB/T 14048.7-2016 international standards.
What Makes Our Tunnel Junction Box Stand Out?
Underground cable installations demand exceptional protection and reliability. Our branch joint system uses integrated resin encapsulation technology that provides superior insulation and mechanical protection in challenging tunnel environments.
The uncut main cable design preserves original current-carrying capacity and mechanical strength. You maintain full electrical continuity without creating potential failure points. This approach extends cable service life while reducing long-term maintenance costs.
Our transparent polycarbonate housing allows visual inspection without opening the enclosure. The impact-resistant snap-to-close design enables quick installation while maintaining IP68-level protection against water ingress and dust penetration.
Complete Protection Features
Waterproof Performance
The filling technique completely seals the resin for ultimate waterproofing. This solution inhibits water ingress and electrical leakage in cable wells, direct burial applications and flooded tunnel sections. The design integrates sealing to protect the cable cores and ensure steady long-term functioning even in wet situations.
Flame Retardants
Our junction boxes are manufactured using premium flame retardant materials that adhere to strict fire safety standards. The complete encapsulation prevents fire from propagating along the cable paths, hence the overall fire protection levels of the system in tunnel installations are greatly increased.
Fire-Resistant Design
Fire-resistant cable junctions to maintain circuit integrity in fire emergencies. It is built for severe heat and the particular design keeps the electrical connections to the key lighting and safety systems operating when they are needed most.
Parameters
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MODEL
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Specification (cross-sectional area of cable core conductors) (mm²)
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Technical Parameters
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||||
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Main Cable
(2~5 Cores)
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Branch Cable
(2~5 Cores)
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Rated Voltage(kV)
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Rated Current(A)
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Size
L*W*H(mm)
|
||
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Copper Core
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Aluminum Alloy Core
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|||||
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ZR-JFZ-16/10
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4~16
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1.5~10
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0.6/1
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72
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/
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260*105*65
|
|
ZR-JFZ-35/16
|
10~35
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2.5~16
|
0.6/1
|
95
|
76
|
325*140*75
|
|
ZR-JFZ-70/35
|
25~70
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2.5~35
|
0.6/1
|
150
|
120
|
365*170*105
|
|
ZR-JFZ-95/35
|
35~95
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2.5~35
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0.6/1
|
150
|
120
|
375*175*110
|
|
ZR-JFZ-120/35
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50~120
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2.5~35
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0.6/1
|
150
|
120
|
380*180*115
|
|
ZR-JFZ-150/50
|
50~150
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6~50
|
0.6/1
|
190
|
152
|
425*185*115
|
|
ZR-JFZ-185/35
|
70~185
|
2.5~35
|
0.6/1
|
150
|
120
|
430*190*120
|
|
ZR-JFZ-95/70
|
35~95
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16~70
|
0.6/1
|
240
|
190
|
440*190*120
|
|
ZR-JFZ-240/70
|
95~240
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6~70
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0.6/1
|
240
|
190
|
460*210*130
|
|
ZR-JFZ-185/95
|
70~185
|
10~95
|
0.6/1
|
290
|
230
|
515*230*140
|
|
ZR-JFZ-300/95
|
120~300
|
10~95
|
0.6/1
|
290
|
230
|
515*230*140
|
|
ZR-JFZ-240/120
|
95~240
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50~120
|
0.6/1
|
340
|
280
|
520*240*145
|
Installation Steps
Flexible Installation Advantages
With traditional cable branching you have to measure beforehand and tailor-make exactly. Our system upends that approach entirely.
The placements of the branches can be easily adjusted when installing on site. No pre-measuring required. No waiting for custom manufacture. Just mount the Tunnel Junction Box where you want it for your project.
The versatility greatly minimises installation complexity. Your workers save time, save labour costs and finish projects faster. This simplified approach minimises human mistake while preserving professional grade quality of the connection.
Its compact shape improves tunnel layout efficacy. The compact size reduces the space required for installation, yet provides convenient access for future inspection or modification.
Wide Application Range
Our branch cable joints serve diverse tunnel and underground applications:
Transportation Infrastructure: Metro systems, highway tunnels, railway tunnels requiring reliable power distribution for lighting, ventilation, and safety systems.
Commercial Buildings: Underground parking facilities, basement electrical rooms, and subsurface utility corridors where moisture protection is essential.
Industrial Facilities: Manufacturing plants, warehouses, and processing facilities with underground cable distribution networks.
Public Infrastructure: Municipal utility tunnels, water treatment plants, and public facility underground systems demanding maintenance-free performance.
The versatile design accommodates single-core and multi-core polymeric cables, paper-insulated cables, and various armored cable types.
Cost-Effective Performance
Every endeavour needs economic efficiency. Our products have demonstrated measurable cost savings in a number of areas.
Material savings begin with the uncut cable design – 2-3 meters of pricey main cable is saved at each branch point. Do this for dozens or hundreds of connections, and the savings become significant.
Installation is simplified to reduce labour expense. They are speedier connections, requiring less specialised expertise. Intuitive design avoids installation errors that result in costly rework.
Maintenance costs tend to zero. Maintenance free, sealed structure reduces the need for routine examination. Installed correctly, these connections will last for decades without any intervention.
Long term reliability means no expensive emergency repairs and system downtime. So you can count on your tunnel lighting and power systems to not fail you when you don’t anticipate it.
FAQ
Q: What is a product and what does it do?
A: A product is an electrical enclosure designed specifically for underground and tunnel cable connection applications. It houses branch connections where cables split from main distribution lines. The box protects these vulnerable connection points from moisture, physical damage, and environmental conditions common in tunnel environments. Our system uses resin encapsulation to provide complete insulation and waterproofing while maintaining easy access for inspection.
Q: What are the different types of junction boxes for tunnel applications?
A: Tunnel applications typically require specialized junction boxes including waterproof resin-filled boxes, flame-retardant enclosures, and fire-resistant units. Standard boxes include branch joints for uncut main cables, T-type connectors for creating new branch circuits, and repair joints for damaged cable sections. Material choices include polycarbonate housings for impact resistance and corrosion protection. Select boxes based on your specific voltage requirements, cable sizes, and environmental protection needs.
Q: How to determine the right junction box for your tunnel project?
A: Consider these key factors: First, assess your cable specifications—main cable size, branch cable requirements, and number of cores. Second, evaluate environmental conditions—will the box face water exposure, high temperatures, or fire risk? Third, check voltage ratings match your system requirements. Fourth, consider installation constraints—available space, access for maintenance, and mounting methods. Our Model ZR-JFZ-95/35 suits most tunnel applications with 35-95mm² mains and 2.5-35mm² branches at 0.6/1kV.
Q: How to waterproof a product properly?
A: Proper waterproofing requires manufacturer-designed solutions, not DIY methods. Our products achieve IP68 protection through integrated resin-filling technology. The two-part polyurethane resin creates complete encapsulation of all electrical connections. This factory-engineered approach far exceeds temporary measures like silicone, plastic wrapping, or sealants. Always install according to manufacturer specifications to maintain the stated IP rating. The sealed design prevents moisture ingress in direct burial, cable wells, and flooded tunnel sections.
Q: Can I install branch connections without cutting the main cable?
A: Yes—this is precisely what our system enables. The innovative uncut main cable design allows you to create branch connections without severing the main conductor. This preserves the cable's original current-carrying capacity and mechanical strength. You simply position the junction box at your desired branch location, make the connection, and complete the resin seal. This approach reduces installation time, eliminates cable waste, and maintains superior electrical continuity compared to traditional cut-and-splice methods.
Contact Us for Professional Cable Solutions
Need expert guidance on Tunnel Junction Box cable connection systems? Reach out today at info@okmbranchcable.com to discuss your requirements.
