What’s the biggest fear in engineering? It’s when the cable, buried for just a year, starts to experience intermittent signal drops. Digging it up reveals it’s either been gnawed by rats or flattened by ground subsidence.
At this point, the repair costs and downtime losses can be dozens of times greater than the money saved on the cable itself.
What you need isn’t cheap stuff, but steel-tape armored control cables that guarantee a safe and reliable connection once buried.
What will you get if you buy from us?
- Truly robust: Our double-layered steel tape is tightly wrapped, not the thin, paper-thin kind. Whether it’s heavy machinery or swarms of termites and rodents, this “armor” is your lifeline, ensuring your system’s signal remains uninterrupted.
- No shortcuts with the copper core: Many low-priced cables use recycled or impure copper, resulting in high resistance and unsuitability for long-distance control. We only use high-purity oxygen-free copper, ensuring stable conductivity, preventing machine errors, and saving your engineers from hair loss.
- Factory direct supply, no hidden fees: We are a long-established cable manufacturer in China, directly connecting construction sites and exporters. No middlemen taking a cut, so you get the real factory price. Shipment is on the day the contract is signed, ensuring your project schedule isn’t delayed.
- We can make any specifications you need: Flame-retardant, low-smoke halogen-free, fire-resistant… Custom specifications that other companies find too troublesome to handle are no problem with us. We understand that every project environment is different, and we don’t want you spending extra money on unnecessary features.
Don’t hesitate, add us on WeChat or give us a call to get a quote and compare prices. Even if we don’t work together this time, getting to know a reliable source manufacturer will definitely benefit your future purchases.
What is a steel tape armored control cable (STA control cable)?
Steel-tape armored control cables are cables formed by adding a double layer of steel tape armor to ordinary control cables. STA is an abbreviation for “Steel Tape Armored”.
Control cables are mainly used to transmit control, monitoring, and protection signals. They typically have 2 to 61 cores and a voltage rating of 450/750V. Ordinary control cables only have copper wire braided shielding, while STA control cables have a double layer of steel tape armor outside the shielding layer, giving them resistance to external damage.
STA Control Cable Structure:
1. Conductor: Multi-strand finely stranded oxygen-free copper wire (Category 2 or 5 conductor)
2. Insulation: Polyvinyl chloride (PVC) or cross-linked polyethylene (XLPE)
3. Cable Forming: Multi-core stranded, filler rope maintains roundness
4. Shielding Layer (some models have): Copper wire braided or copper tape wrapped shielding
5. Inner Sheath: Extruded polyvinyl chloride inner sheath
6. Armor Layer: Double-layer galvanized steel tape with gaps
7. Outer Sheath: Polyvinyl chloride (PVC) outer sheath, usually black
Performance parameters
| Parameters | Technical Requirements |
|---|---|
| Rated voltage | U0/U: 0.6/1kV, 1.8/3kV, 3.6/6kV, 6/10kV |
| Power frequency withstand voltage | 3.5kV (5min) / 12kV (5min), the duration varies depending on the voltage level. |
| Insulation resistance | ≥100MΩ·km (at 20℃) |
| Operating temperature | Maximum permissible conductor temperature: 90℃ (XLPE insulation) / 70℃ (PVC insulation) |
| Short circuit temperature | Maximum permissible temperature: 250℃ (duration ≤ 5s) |
| Current carrying capacity | Air-based installation: 30A~1200A; Soil-based installation: 40A~1500A (depending on cross-sectional area and ambient temperature) |
| Minimum bending radius | Armored cable: 15 × cable outer diameter |
| compressive strength | ≥1500N/cm (steel belt armor) |
| tensile strength | Conductor tensile strength ≥120 N/mm²; sheath elongation at break ≥150% |
| wear resistance | Meets GB/T 12706 or IEC 60502 standards and passes 1000 abrasion resistance tests. |
| Laying method | Direct burial, pipe laying, tunneling, and cable trays are not suitable for underwater or frequently bending scenarios. |
| Flame retardant rating | Flame retardant options available: Class A/Class B/Class C (compliant with GB/T 18380 standard) |
| Low smoke and halogen-free characteristics | Smoke density and light transmittance ≥60%, halogen acid gas release ≤5mg/g (LSZH sheath model only) |
| Corrosion protection | Optional termite-proof and rodent-proof covers are available, suitable for soil or damp environments. |
| Operating temperature range | -40℃~90℃ (PVC sheath); -50℃~90℃ (XLPE/PE sheath) |
STA vs. SWA vs. ATA: How to choose?
| characteristic | STA (Steel Belt Armor) | SWA (Steel Wire Armor) | ATA (Aluminum Strip Armor) |
|---|---|---|---|
| Material | Cold-rolled steel strip | galvanized steel wire | aluminum strip |
| Mechanical strength | High (good compressive strength) | Extremely high (good tensile strength) | medium |
| Rat bite prevention | excellent | excellent | good |
| Corrosion resistant | Generally (requires an outer protective sleeve) | Excellent (galvanized coating) | Excellent (aluminum oxide) |
| Electromagnetic shielding | good | excellent | generally |
| Applicable Scenarios | Underground pipes, indoor drainage | Vertical shaft, high drop laying | Slightly corrosive environment, overhead |
Note: If extremely strong resistance to lateral pressure is required (such as direct burial underground) and cost is a concern, STA is the best choice; if enormous tensile forces are required (such as vertical shaft hoisting), SWA should be selected.
| Region/Market | Common models | Detailed Explanation of Meaning | Implementation Standards | Equivalent Comparison and Remarks |
|---|---|---|---|---|
| International (General) | CU/PVC/STA/PVC | Copper conductor/PVC insulated/steel tape armored/PVC sheathed multi-core control cable | IEC 60502-1 | Equivalent to Chinese KVV22 (unshielded) or KVVP2-22 (shielded variant). |
| International (General) | CU/PVC/CTS/STA/PVC | Multi-core control cable with copper conductor, PVC insulation, copper tape shielding, steel tape armor, and PVC sheath. | IEC 60502-1 | Equivalent to Chinese KVVP2-22, with copper tape shielding (CTS). |
| International (General) | CU/XLPE/STA/PVC | Copper conductor/cross-linked polyethylene insulation/steel tape armor/PVC sheathed multi-core cable | IEC 60502-1 | Equivalent to Chinese KYJV22/KYJVP2-22, high temperature resistant type |
| International (Europe) | NYBY | PVC insulated/steel tape armored/PVC sheathed cable (multi-core, suitable for control applications) | VDE 0276 or similar national standard | Equivalent to China’s KVV22, it is commonly used for fixed installations and is prevalent in the European market. |
| International (Europe) | N2XBY | XLPE insulated/steel tape armored/PVC sheathed cable | VDE 0276 or similar | Equivalent to Chinese KYJV22, high-temperature resistant European version |
| International (Descriptive) | Steel Tape Armored Multi-core Control Cable | Steel tape armored multi-core control cable | IEC 60502-1 or export certification | Commonly used Chinese export markings, flexibly corresponding to various Chinese model numbers. |
| China | KVV22 | PVC insulated and sheathed steel tape armored control cable (unshielded) | GB/T 9330-2020 | Basic economic model, suitable for direct burial or general mechanical protection. |
| China | KVVP22 | Polyvinyl chloride insulated and sheathed copper wire braided shielded steel tape armored control cable | GB/T 9330-2020 | Medium shielding + STA protection |
| China | KVVP2-22 | PVC insulated and sheathed copper tape wrapped shielded steel tape armored control cable | GB/T 9330-2020 | Best-selling model, strong shielding + STA, best anti-interference |
| China | KYJV22 | Cross-linked polyethylene insulated, polyvinyl chloride sheathed, steel tape armored control cable (unshielded) | GB/T 9330-2020 | Temperature resistant up to 90℃, ideal for high-temperature environments. |
| China | KYJVP2-22 | Cross-linked polyethylene insulated, polyvinyl chloride sheathed, copper tape wrapped, shielded, steel tape armored control cable | GB/T 9330-2020 | High temperature resistance + strong shielding, commonly used in high-end industries |
| China | ZR-KVVP2-22 | Flame-retardant PVC insulated copper tape shielded steel tape armored control cable | GB/T 9330-2020 | Flame-retardant type, specifically for fire protection systems |
Common detailed specifications
| Number of cores × Cross-sectional area (No. × mm²) | Insulation thickness (mm) | Armor thickness (mm) | Sheath thickness (mm) | Approximate outer diameter (mm) | Approximate weight (kg/km) |
|---|---|---|---|---|---|
| 2×1.5 | 0.7 | 2×0.2 | 1.5 | 12.2 – 14.0 | 211.5 – 300 |
| 2×2.5 | 0.8 | 2×0.2 | 1.5 | 13.4 – 15.0 | 260.4 – 349 |
| 4×1.5 | 0.7 | 2×0.2 | 1.5 | 13.4 – 14.2 | 275.1 – 331 |
| 4×2.5 | 0.8 | 2×0.2 | 1.5 | 13.4 – 16.1 | 352.8 – 450 |
| 4×4 | 0.8 | 2×0.2 | 1.5 | 14.4 – 17.4 | 369 – 505 |
| 4×6 | 0.8 | 2×0.2 | 1.5-1.7 | 15.6 – 18.8 | 451 – 619 |
| 5×1.5 | 0.7 | 2×0.2 | 1.5 | 15.1 – 16.2 | 373 – 423 |
| 5×2.5 | 0.8 | 2×0.2 | 1.5-1.7 | 14.3 – 17.7 | 500 – 533 |
| 7×1.0 | 0.6 | 2×0.2 | 1.5 | 12.2 – 16.4 | 351 – 425 |
| 7×1.5 | 0.7 | 2×0.2 | 1.5-1.7 | 16.0 – 17.2 | 428 – 483 |
How to correctly select steel-tape armored control cables?
1. Determine the operating environment: Are there requirements for direct burial, humidity, rodent protection, or flame retardancy?
2. Determine the number of cores and cross-section: Select based on load current and the number of signal loops.
3. Select insulation material: PVC for general applications; cross-linked polyethylene (XLPE) for environments above 90℃.
4. Shielding required: Shielded models must be selected for environments with electromagnetic interference.
5. Check the applicable standards: Products conforming to GB/T 9330 or IEC 60227, IEC 60502 standards are recommended.
6. Choose a reputable manufacturer: Look for cables with CCC certification, ISO9001 quality system certification, and type test reports.
7. Pay attention to after-sales service and warranty: Reputable manufacturers offer 5-10 year warranties.
FAQ
Q1: What is the difference between STA control cables and SWA control cables?
A: STA uses steel tape armor, primarily for compression protection, and is lightweight and low-cost; SWA uses steel wire armor, offering stronger tensile strength and is suitable for applications requiring tensile strength.
Q2: Can STA control cables be directly buried?
A: Yes, and this is one of its main advantages. It is recommended to use an external protective pipe or sand layer for protection when directly burying.
Q3: How to choose between flame-retardant and fire-resistant STA control cables?
A: For flame-retardant cables, choose the ZR- prefix; for low-smoke halogen-free cables, choose WDZ-; for fire-resistant cables, choose the NH- prefix.
Q4: What is the difference between STA and KVV22?
A: KVV22 is a Chinese national standard model, its full name being copper core PVC insulated PVC sheathed steel tape armored control cable. STA is a more general international engineering term, referring to all steel tape armored structures.