Product Overview

The DFW-12 series cable distribution boxes are designed for outdoor use, featuring a fully sealed construction and achieving an enclosure protection rating of IP33. The cable joint brackets are made from stainless steel, while the outer casing is crafted from high-quality 2mm-thick stainless steel sheet. Inside the box, a top plate within the cable compartment divides the space into two distinct sections: the busbar room and the cable compartment.

The busbar chamber is a sealed compartment constructed from 2mm-thick steel plates. The cable joint supports are located at the upper part of the busbar chamber, providing support for the bushings, which in turn secure the cable joints—each set with an inter-phase distance of 180mm. If the design includes surge arresters, these are installed at the tail end of the cable joints. Additionally, short-circuit indicators and live-display devices are also mounted within the busbar chamber. All energized components inside the busbar chamber undergo rigorous insulation treatment using silicone rubber coating. Meanwhile, the cable compartment, situated at the lower portion of the busbar chamber, serves as the entry and exit point for cables; it is equipped with cable clamps and grounding terminals for secure cable installation.

Features and Capabilities

● Fully insulated and fully sealed, ensuring personal safety.

● Outdoor-grade, dustproof, moisture-proof, flood-resistant, corrosion-resistant, and highly adaptable to various environments.

● Highly flexible design, with input and output lines ranging from two to six paths, meeting a variety of wiring requirements.

● Compact in size, with a sleek and elegant design, easy to install, and maintenance-free.

● Equipped with a live display.

● Equipped with a short-circuit indicator.

● Can be equipped with a surge arrester.

Environmental Conditions and Requirements

● Altitude not exceeding 2500m.

● Ambient temperature: -45°C to +45°C.

● Relative humidity: The daily average should not exceed 95%, and the monthly average should not surpass 90%.

● Installation location: Areas free from fire hazards, explosion risks, conductive dust, chemically corrosive gases, and severe vibrations.

● If the above conditions are exceeded, users may consult with our company.

Ordering Instructions (Please specify when placing your order)

1. Main circuit scheme number, purpose, single-line system diagram, arrangement drawing, and distribution room layout plan, etc.

2. Schematic diagram of the auxiliary circuit wiring and terminal arrangement diagram.

3. Model, specifications, and quantity of electrical components within the switchgear.

4. Requirements for control, measurement, and protection functions of switching equipment, as well as requirements for other interlocking and automatic devices.

5. If bus bridges are required to connect switchgear units or incoming feeder cabinets, please provide specific requirements such as the rated current-carrying capacity of the bus bridge, its span length, and the height from the ground.

6. When attachments or spare parts are needed, please specify the type and quantity required.

7. If the switchgear is to be used in special environmental conditions, other specific requirements should be clearly specified at the time of order placement.

Product appearance diagram

1. Cable connector rack; 2. Front cable connector; 3. Insulating cap; 4. Rear cable connector

Main Technical Specifications

Structure Description

The DFW-12 series cable distribution boxes are designed for outdoor use, featuring a fully sealed construction and achieving an enclosure protection rating of IP33. The cable joint brackets are made from stainless steel, while the outer enclosure is crafted from high-quality 2mm-thick stainless steel sheet. Inside the box, a cable compartment top plate divides the space into two distinct sections: a busbar room and a dedicated cable compartment.

The busbar chamber is a sealed enclosure constructed from 2mm-thick steel plates. At the upper part of the busbar chamber, there’s a cable joint support structure designed to hold the bushings, which in turn secure the cable joints—each positioned at a consistent 180mm spacing. If the design includes surge arresters, these are installed at the tail end of the cable joints. Additionally, short-circuit indicators and live-display devices are also mounted within the busbar chamber. All energized components inside the busbar chamber undergo rigorous insulation treatment with silicone rubber coating. Meanwhile, the cable compartment, located at the lower section of the busbar chamber, serves as the entry and exit point for cables. Inside this compartment, you’ll find cable fixing clamps as well as grounding terminals.

Wiring Diagram

Model	Wiring Diagram	Arrangement Diagram	External dimensions (width × depth × height)
DFW12-11D			670×650×1150mm
DFW12-12D			880×650×1150mm
DFW12-13D or DFW10-12P			880×650×1150mm
DFW12-15D			1150×650×1150mm
DFW12-17D			1300×650×1150mm

Arrangement Diagram Explanation

1. ASTS front connector; 2. ASTS front connector; 3. Lightning arrester; 4. Rear connector

Common Cable Connectors

1. LCJ-10/630 Touchable Cable Front Connector
2. KHT-1 0/630 Touchable Cable Back Connector
Manufactured using high-quality, imported insulating rubber via fully automated injection molding, this product features semiconductor shielding layers on both its inner and outer surfaces. The inner layer ensures uniform distribution of the internal electric field, while the outer shielding layer grounds the cable termination, maintaining a zero potential at its surface. At the lower end of the stress cone, the inner semiconductor layer makes tight contact with the cable's semiconductor shield, and the outer semiconductor layer is securely connected to the cable termination's external semiconductor layer—both of which are then grounded through the termination's dedicated grounding hole. This design not only eliminates the risk of electric field concentration at the point where the cable's outer shielding layer is interrupted but also keeps the outer shield at zero potential, ensuring maximum safety for personnel.
The touchable cable rear connector is installed onto the touchable cable front connector via a coupling, and its rear end can further accommodate another rear connector through the same coupling, enabling multi-way branching. Alternatively, it can be connected to a surge arrester to provide overvoltage protection for the power grid.

Double-walled casing and single-walled casing

The double- or single-pass casing is used to support the cable’s front connector. The core of the double-pass casing forms part of the busbar, and the casing itself is molded from epoxy resin material and secured to the cable connector bracket using screws.

Short-Circuit Fault Indicator

Installed on incoming/outgoing cables or branch cables within the tap-off box, the indicator light flashes when a fault current flows, enabling line patrol personnel to quickly locate the fault and minimize power outage duration. The robust, weather-resistant plastic housing is designed to withstand even the harshest environmental conditions—and can even be submerged in water. Technical specifications are shown in the figure below:

Cable Connection Detail Drawing

1. Equipment casing; 2. Touchable front connector; 3. Wiring lug; 4. Double-ended bolt; 5. Touchable rear connector; 6. Intermediate connector; 7. Insulation plug; 8. Flat washer drawing; 9. Spring washer drawing; 10. Nut; 11. Protective cap; 12. Test cap; 13. Stress cone; 14. Cable (branch)