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China DFW Switched Cable Branch Box - Reliable Factory Suppliers for Durable Power Solutions
Model and Definitions
DFW Technical Parameters
| No. | Items | Parameters |
| 1 | Nominal Voltage | 12kV |
| 2 | Rated Currency | 630A |
| 3 | Power Frequency Withstand Voltage (Phase to Ground) | 42kV/min |
| 4 | Lightning lmpulse Voltage | 75kV |
| 5 | Rated Breaking Current | 630A |
| 6 | Rated Short-circuit Making Current(Peak Value) | 50kA |
| 7 | Rated Short-time Withstand Current | 25kA/4S |
| 8 | Rated Peak Withstand Current | 50kA |
| 9 | Rated Peak Withstand Current | 45A |
| 10 | Rated Breaking Capacitive Current | 16A |
| 11 | Full Load Breaking Time | >100 |
| 12 | Mechanical Operation Time for Opening and Closing | 2000 |
External Schematic Diagram
Basic Structure
Technical Requirements
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The inner side of the brick wall is to be sealed with a 1:3 cement mortar mix and treated for waterproofing.
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Beam penetrations should use φ6 concrete operations.
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The foundation channel steel must undergo anti-corrosion treatment after fabrication.
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After the installation of the branch box is completed, the area around the base should be sealed with cement.
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Waterproof measures must be taken at the manhole entrance.
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Grounding electrodes should be pre-embedded in the foundation, with grounding resistance meeting the requirements set by the power department.
Ordering Instructions
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The product model and any special requirements from the user can provide a one-time diagram.
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The standard cross-sections for incoming and outgoing lines and branch cables.
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The quantity of optional surge protectors and short-circuit fault indicators.
Frequently Asked Questions (FAQ)
Q: What is the nominal voltage and rated current of the DFW unit?
A: The DFW unit operates with a nominal voltage of 12kV and a rated current of 630A.
Q: What foundation preparation is needed before installation?
A: The foundation requires a 1:3 cement mortar waterproof coating on the inner brick wall, anti-corrosion treated channel steel, and pre-embedded grounding electrodes compliant with power department regulations.
Q: How many mechanical operations can the equipment endure?
A: The equipment is rated for up to 2000 mechanical operations for opening and closing cycles.
Q: What details must be specified when placing an order?
A: Buyers need to specify the product model, single-line diagram (one-time diagram), cable cross-section dimensions for main/branch lines, and quantities for optional surge arresters or fault indicators.
Q: What are the waterproofing requirements for the installation site?
A: Waterproofing treatment must be applied to the inner brick walls, base perimeter sealed with cement after setup, and reliable waterproof measures implemented at the manhole entrance.