📦 Cable Branch Box Price Calculator
Get a reference FOB price for a DFW-series cable branch box from its voltage, rated current and quantity — useful for quick project budgeting.
⚙️ Specs
📊 Result
For contractors and buyers estimating cable distribution boxes for projects.
How it is calculated
· Reference price = base × voltage factor × current factor × quantity factor.
· Baseline: DFW-12 stainless, 1-in/4-out, 12 kV, 630 A.
Referenced standards
| Standard | Scope |
|---|---|
| GB/T 7251 | Low-voltage switchgear and controlgear assemblies |
Worked example — 12 kV, 630 A branch box
1. Voltage 12 kV, rated current 630 A, quantity 1.
2. Factor = voltage × current × quantity (all 1.0 at baseline).
3. Reference price = mid-range of the DFW-12 base range.
FAQ
What is a cable branch box (DFW) and when is it used?
A cable branch box (DFW series) is an outdoor enclosure that splits a main cable into multiple branch feeders without switching, used in urban LV and 10 kV distribution to feed several loads from one cable. It saves cost versus a full Switchgear line-up. Ratings typically run 400-630 A at 0.4 kV.
How do I choose the current rating of a branch box?
The branch box current rating must exceed the maximum demand current of the combined branches, with 20-25% margin. A 250 A main with four 63 A branches is a typical LV arrangement. The calculator sizes the box by voltage and rated current and returns a reference FOB price.
What is the difference between a cable branch box and a ring main unit?
A branch box only splits cables — no switching, no protection — so a fault downstream must be cleared upstream. An RMU adds load-break switches and (optionally) a breaker for isolation and protection. Branch boxes are cheaper and used for simple radial taps; RMUs for ring networks needing switching.
What ingress protection does an outdoor branch box need?
Outdoor cable branch boxes need IP44 or higher (IP54 for dusty or coastal sites) to resist rain and dust ingress. Enclosures are usually stainless steel or GRP with anti-corrosion coating, and are padlockable and vermin-proof. The calculator's pricing reflects the standard weatherproof enclosure and mounting type.
How much does a cable branch box cost?
A 0.4 kV cable branch box runs roughly $600-1,500 FOB depending on ways and current; a 10 kV branch box $1,500-3,200. Price scales with the number of branches and the current rating. The calculator returns a live reference price from the pricing matrix.
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