Tunnel Waterproof Junction Box
Specialised in branch cable joints for 20 years
Insulated, flame retardant, fire resistant, waterproof, wide range of uses
Suitable for main cable 25~70mm, 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 Waterproof Junction Box - Professional LV Cable Branch Connection Solution
OUKAMU Tunnel Waterproof Junction Box represents 20 years of specialized engineering in cable branch technology. Designed for low-voltage distribution systems rated 0.6/1kV, our junction box accommodates main cables from 25~70mm² and branch cables from 2.5~35mm². This innovative solution requires no main cable cutting, saves 2-3 meters of cable per installation, and complies with GB/T 14048.7-2016 international standards. Protected by over 150 national invention patents, our integrated branch connection system delivers superior waterproof protection, flame retardancy, and fire resistance for tunnel construction and underground applications.
Superior Waterproof Protection for Underground Installations
The junction box is waterproof IP68 thanks to the incorporated resin encapsulating technique. Full sealing design, no water entry, no electrical leakage, suitable for cable wells and direct burial applications.
The tough underground conditions can't touch the clear polycarbonate casing that's made from impact-resistant materials. Our encapsulating approach provides long-term watertight integrity, unlike traditional methods which rely on plastic wrapping or silicone sealing.
Bottom and side cable entrance design prevents water collecting at the connection locations. This engineering method is consistent with industry best practices since top entrance layouts allow water to run downward into electrical connections.
Flexible Installation Without Main Cable Cutting
The traditional branch connections entail cutting the main cable, which reduces its current carrying capability and mechanical strength. Our proprietary method ensures cable continuity for original electrical performance and lifetime.
Easy installation, no need for pre-measurement or customisation. The placements of the branches can be flexibly adjusted on-site, which is very flexible for tunnel illumination and power distribution projects. This saves critical building time and labour expenses are reduced substantially.
The primary wire is uncut, therefore there are no potential failure sites. The electrical system will be more reliable and require less maintenance over the life of the system.
Multi-Layer Safety Features
Our junction box incorporates three critical safety protections:
Flame Retardant Design - Materials meet strict fire safety standards, preventing flame propagation along cable routes in tunnel environments.
Fire Resistant Construction - Enhanced insulation maintains circuit integrity during fire events, ensuring emergency lighting and safety systems remain operational when needed most.
Electrical Insulation - Two-part polyurethane resin provides robust mechanical protection and electrical insulation, exceeding industry requirements for low-voltage applications.
The integrated sealing keeps cable cores completely enclosed. This prevents accidental contact with live conductors and protects against environmental contamination.
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
|
72
|
/
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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
|
2.5~35
|
0.6/1
|
150
|
120
|
365*170*105
|
|
ZR-JFZ-95/35
|
35~95
|
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
|
2.5~35
|
0.6/1
|
150
|
120
|
380*180*115
|
|
ZR-JFZ-150/50
|
50~150
|
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
|
6~70
|
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
|
50~120
|
0.6/1
|
340
|
280
|
520*240*145
|
Installation Steps
Wide Application Scenarios
OUKAMU Tunnel Waterproof Junction Box serves diverse infrastructure projects requiring reliable cable branch connections.
Tunnel construction projects benefit from our maintenance-free design and space-saving installation. The compact configuration optimizes line routing in confined spaces, improving overall tunnel utility efficiency.
Metro and railway systems demand high-reliability connections that withstand vibration and moisture. Our junction boxes have proven performance in projects like Nantong Metro Line 2 and multiple high-speed railway installations.
Commercial buildings, residential complexes, and industrial facilities use our solutions for low-voltage distribution upgrades. Both new construction and retrofit applications install quickly without disrupting existing power systems.
Underground parking facilities and basement electrical systems require robust waterproof protection. Our IP68-rated enclosures ensure safe operation in consistently damp environments.
Cost-Effective Installation Advantages
Every installation saves 2-3 meters of main cable compared to the old approach of cutting and splicing. Multiply that by dozens or hundreds of branch points and the material savings is significant.
Less time to install means less labour expense. Your electrical contractors make branch connections faster, keeping projects on schedule and on budget.
The re-usable architecture enables future upgrades without the need to replace the complete junction box assembly. The flexibility is a plus when tenant layouts alter or electrical reconfiguration is needed for equipment upgrades.
No recurring costs for inspection and repair thanks to maintenance-free operation. Proper installation of our junction boxes by the manufacturer ensures decades of trouble-free, reliable service.
FAQ
Q: What makes this junction box suitable for tunnel applications?
A: Our junction box combines IP68 waterproof rating, flame retardant materials, and fire-resistant construction specifically for underground environments. The design handles moisture, temperature variations, and fire safety requirements that tunnel installations demand.
Q: Can I install this junction box myself?
A: Professional installation by qualified electricians is required to ensure compliance with electrical codes and maintain warranty coverage. Proper installation following manufacturer instructions is essential for achieving the rated IP68 protection level.
Q: How does the uncut main cable method work?
A: Our patented connector system creates branch connections without severing the main conductor. Special piercing contacts penetrate cable insulation to establish electrical connection while maintaining main cable continuity and structural integrity.
Q: What cable types are compatible?
A: The junction box works with polymeric insulated cables including PVC, XLPE, and armored cables. It accommodates both stranded and solid conductors in single-core and multi-core configurations from 2 to 5 cores.
Q: How do I prevent water entry during installation?
A: Follow manufacturer instructions carefully, ensuring bottom or side cable entry rather than top entry. Use appropriate cable glands rated for outdoor use, and verify all sealing surfaces are clean before closing the enclosure.
Q: What is the expected service life?
A: With proper installation in suitable environments, our junction boxes provide 20+ years of maintenance-free operation. The resin encapsulation resists degradation from moisture, UV exposure, and temperature cycling.
Contact OUKAMU for Expert Support
Contact our technical team at info@okmbranchcable.com for Tunnel Waterproof Junction Box specifications, project consultation, and expert support tailored to your requirements.
