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Cable Branch Box

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Cable Branch Box (12kV - 40.5kV Outdoor Medium Voltage Distribution Enclosure)

 

Medium-voltage cable branch boxes simplify cable routing, branching, and power distribution in underground networks without requiring full substations. Engineeed for outdoor installation, these units integrate load switches, fault indicators, and dead-break cable accessories inside IP65-rated enclosures to ensure continuous grid operation.

 
 

Product Types

European-Style Cable Branch Box

Configured with IEC-standard 630A dead-break touchable cable connectors and 200A load-break elbows. Uses SF6 gas insulation or solid epoxy shield technology for compact installations in high-density urban areas.

American-Style Cable Branch Box

Equipped with load-break elbows and capacitive test points. Features a modular layout with visible break points, suitable for industrial park power distribution and underground conversion projects.

Switchable Cable Branch Box

Combines cable branching with integrated SF6 or vacuum load-break switches (LBS) or circuit breakers. Provides segmented isolation and automatic fault clearing for ring main units (RMU).

 

Technical Specifications

 

Parameter

European Type (SF6 Insulated)

American Type (Air/Solid)

Switchable Branch Box

Rated Voltage (kV)

12 / 24 / 40.5

12 / 24

12 / 24 / 40.5

Rated Current (A)

630 / 1250

200 / 630

630 / 1250

Rated Frequency (Hz)

50 / 60

50 / 60

50 / 60

Short-Time Withstand Current (kA/s)

20 kA / 3s, 25 kA / 4s

16 kA / 3s, 20 kA / 3s

25 kA / 4s, 31.5 kA / 4s

Enclosure Protection Class

IP65 / IP66

IP55 / IP65

IP65 / IP66

Bushings & Interface

IEC 50181 Type C / Type F

IEEE 386 Standard Bushings

IEC 50181 / Customized

Housing Material

2.0mm 304/316L Stainless Steel / SMC

304 Stainless Steel / Cold-Rolled

304/316L Stainless Steel

Insulation Gas Leak Rate (Annual)

< 0.1% per year

N/A

< 0.1% per year

 

Wall Mounted MV Cable Branch Box

 

Applications

Urban Underground Grids: Replaces overhead lines and direct-burial splices, enabling inline cable tappings without constructing full surface substations.

 

Renewable Power Plants: Connects individual solar inverter strings or wind turbine generators before stepping up voltage for grid connection.

 

Industrial Complexes & Data Centers: Provides ring-main loops and segmented cable isolation to allow localized maintenance without taking the entire site offline.

 

 
Customization Options
 
01/

Busbar Configuration: 2-way, 3-way, 4-way, up to 8-way cable connections with expandable bus bar interfaces.

02/

Enclosure Material & Surface Finish: 304/316L stainless steel, SMC glass-fiber reinforced polyester, or electro-galvanized sheet steel with UV-resistant electrostatic powder coating (RAL 7032 / RAL 7035).

03/

Smart Grid Monitoring (RTU/SCADA): Pre-installed fault passage indicators (FPI), current transformers (CT), temperature sensors, and wireless communication units for remote telemetry.

04/

Climate Adaptations: Internal thermostatically controlled space heaters and anti-condensation drainage valves for tropical or arctic ambient conditions (-40°C to +60°C).

 

 

Quality & Compliance

Type Test Compliance: Fully tested in accordance with IEC 62271-200 (MV Switchgear) and IEC 60529 (IP Enclosure Protection).

 

Helium Leak Detection: Every SF6 gas tank undergoes automatic robotic helium mass spectrometer testing to verify leakage rates below 0.1% annually.

 

Dielectric & Partial Discharge Tests: 100% routine testing conducted before shipment, including power frequency withstand voltage and partial discharge testing (< 5pC at rated voltage).

 

Raw Material Standards: Stainless steel sheets verified with XRF material analysis; brass and copper busbars maintain >99.9% electrical conductivity (IACS).

High Voltage Cable Branch Box

 

Manufacturing & Delivery
 

In-House Fabrication

CNC laser cutting, automated bending, and robotic TIG welding ensure dimensional tolerances within ±0.2mm for tight cabinet sealing.

Production Lead Time

2 to 3 weeks for standard configurations; 4 to 6 weeks for custom OEM enclosure dimensions and SCADA-integrated projects.

Export Packaging

Vacuum-sealed moisture-proof foil wrapping packed inside fumigated sea-worthy wooden cases with shock-absorption corner blocks.

 

FAQ

 

Q: What cable termination types are compatible with your branch boxes?

A: Our branch boxes accept both DIN/IEC standard outer cone bushings (Type C, Type F) and IEEE 386 interface bushings. We supply compatible dead-break separable connectors, load-break elbows, and stress control kits based on your cable cross-section (35mm² to 630mm²).

Q: How do you prevent internal condensation in high-humidity environments?

A: Each enclosure is equipped with continuous silicone door gaskets, IP66-rated ventilation louvers with fine mesh, and an internal thermostatically controlled PTC space heater that activates when relative humidity exceeds set thresholds.

Q: Can your branch boxes integrate into an existing SCADA system?

A: Yes. We integrate fault passage indicators (FPI) with Modbus-RTU, IEC 60870-5-104, or DNP3 communication protocols, allowing real-time fault signal transmission to central control systems via GSM/GPRS/4G modules.

Q: What is the difference between SF6-insulated and solid-insulated branch boxes in your catalog?

A: SF6-insulated units seal all live busbars inside a stainless steel gas tank, providing compact dimensions immune to environmental pollutants. Solid-insulated units eliminate SF6 greenhouse gas entirely by encapsulating busbars and switches in epoxy resin, meeting zero-carbon grid requirements.

Q: Do you provide GA engineering drawings before production?

A: Yes. For every custom order, our engineering team issues 2D General Arrangement (GA) line drawings and 3D step files within 48 hours for customer engineering review and approval before metal fabrication begins.

Q: What documentation accompanies each shipment for customs and site acceptance?

A: Every shipment includes the Factory Acceptance Test (FAT) report, material test reports (MTR), operation and maintenance manuals, single-line diagrams (SLD), and Certificate of Origin (CO). Type test certificates from independent laboratories are provided upon request.

As one of the most experienced cable branch box manufacturers and suppliers in China, we also support customized service. We warmly welcome you to buy high quality cable branch box from our factory. If you have any enquiry about pricelist, please feel free to email us.

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