Armored cable selection is driven by four independent decisions: armor type (SWA steel wire vs STA steel tape vs interlocked galvanized AC vs stainless steel tube for optical), voltage class (LV 0.6/1 kV, MV 6-35 kV), conductor (Cu vs Al-alloy ASTM B Grade B compacted), and the listing mark that the inspector will look for (UL 4 AC, IEC 60502, NEC 250.118(8) bonding). Getting any one of these wrong voids the installation, so spec them up front.
Market data from 2026 listings shows 1×2×1.5 mm² XLPE/PVC/SWA instrument cable priced at US$0.20–2.00 per metre with a 100 m MOQ, while 22-35 kV XLPE/SWA medium-voltage power cable is typically quoted per metre on a 1000 m run from Tianjin port [S2][S5][S6]. The 5-10× price gap between LV instrumentation and MV power is the single biggest driver behind mis-spec on small commercial jobs.
Armor Construction and Mechanical Duty
Steel-wire armored (SWA) cable uses round galvanized steel wires helically laid over the inner bedding, providing high tensile pull strength and ~90% coverage for direct-burial and outdoor trench duty; it is the default for IEC 60502-1 LV and IEC 60502-2 MV 6-35 kV power circuits [S5][S6]. Steel-tape armored (STA) variants use two corrugated or helically wrapped steel tapes, giving lower pull strength but better crush resistance and a smaller bend radius, which is why they are common in cable tray indoor risers and conduit.
The UL-listed "AC" cable family is a different beast: soft-drawn copper THHN/THWN-2 conductors, individually paper-wrapped, cabled with a 16 AWG solid aluminum bond wire placed longitudinally under the armor for NEC 250.118(8) equipment-grounding equivalence, and protected by interlocked galvanized lightweight steel armor [S2]. The "90C dry only" marking on UL 4 AC cable means the THHN insulation is rated 90°C in dry locations but derates when run in wet conduit — a common field mistake.
For signal and data, armored optical cable uses a stainless-steel tube or corrugated steel tape plus Kevlar yarns, with Dongguan Qingying's 2026 catalog listing 98 SKUs in this category alone, alongside MPO patch cord (46 SKUs) and fiber optic patch cord (186 SKUs) [S1]. The mechanical duty is crush and rodent resistance rather than tensile pull, so the armor is lighter and the cable OD smaller than a comparable SWA power cable. See armored optical cable selection notes for how these differ from copper versions.
Voltage Class and Insulation System
Low-voltage armored power cable at 0.6/1 kV is built with XLPE or PVC insulation and a PVC or PE oversheath; the 1×2×1.5 mm² XLPE/PVC/SWA instrument cable from Huadong is a typical 2-core control/instrumentation construction at 100 m MOQ [S6]. For 6-35 kV medium-voltage distribution, XLPE-insulated SWA cable (model pattern YJV22 / YJV32) is the workhorse, with the 22-35 kV class exported from Tianjin in long-length 1000 m drums [S5].
The insulation temperature rating sets the continuous-current ampacity: THHN/THWN-2 inside AC cable is 90°C dry, which maps to the 75°C column of NEC Table 310.16 once termination ratings are applied [S2]. XLPE is rated 90°C continuous and 250°C short-circuit, which is why it dominates MV armored builds. PVC-insulated armored cable is typically 70°C and is rarely used above 1 kV.
For 0.6/1 kV aluminum-alloy distribution, the YJHLV(TC90) construction uses ASTM Grade B compacted stranded aluminum conductors from 16 mm² to 400 mm² per GB/T 1838.3-2001, supplied unarmored on wooden or steel drums with 15-day delivery [S7]. Adding an armor layer (SWA or STA) to this Al-alloy build drops ampacity slightly and adds ~15-25% to mass but is required where the cable is direct-buried without conduit. For a deeper comparison of control cable versus power cable ratings the data-density tradeoff is the same: bigger conductor insulation, lower armor stress.
Selection Criteria: SWA vs STA vs AC vs Armored Fiber
Pull the catalog and compare on four axes: mechanical protection, voltage class, listing/standard, and typical duty. SWA (steel wire, round) wins on tensile pull and direct-burial, listed to IEC 60502-1 (LV) and -2 (MV), used for 0.6/1 kV power through 22-35 kV MV feeders and the 1×2×1.5 mm² instrument cable class [S5][S6]. STA (steel tape) wins on crush resistance and bend radius, listed to the same IEC 60502 family, used in cable tray, indoor riser, and short outdoor runs where pull tension is low.
UL 4 AC cable with THHN/THHN-2 inner cores and interlocked galvanized steel armor plus a 16 AWG Al bond wire is the North American answer, listed to UL 4, recognized under NEC Article 320, dry 90°C, with a metallic armor that doubles as the equipment-grounding path per NEC 250.118(8) [S2]. It is not a substitute for SWA on IEC jobs, and SWA is not a substitute for AC on NEC jobs, because the bonding arrangement, the armor coverage, and the temperature derating all differ.
Armored optical cable is a fourth family: stainless-steel tube or steel-tape armor over loose buffer tubes, with the 98-SKU catalog at Dongguan Qingying covering indoor/outdoor, rodent-resistant, and direct-buried fiber constructions [S1]. It is selected on fiber count and mode (SM/MM), not on voltage, and is paired with fiber optic patch cord assemblies for the equipment-end termination. For a related commodity comparison, see how stainless steel selection drives armor material choice in corrosive atmospheres.
Conductor Material: Copper vs Aluminum-Alloy
Copper is used for instrument, control and most power armored cable; the 1×2×1.5 mm² SWA instrument cable is copper-conductor [S6], and UL 4 AC cable is specified as copper conductor with THHN inner core [S2]. Aluminum-alloy 8000-series conductors (AA-8030) per ASTM B800 and B836 are the modern choice for 0.6/1 kV LV distribution, with the YJHLV(TC90) covering 16-400 mm² in compacted Class B stranding [S7].
For 22-35 kV MV distribution the conductor is almost always Cu because the diameter penalty on Al-alloy at that voltage class pushes the cable OD and bend radius outside practical tray-fill limits [S5].
For automotive and lightweight-plant feeders, Al-alloy TC90 has been adopted widely in Chinese commercial builds since the GB/T 1838.3-2001 standard aligned with ASTM B800; for plant retrofits where aluminum alloy selection for electronics is constrained by termination temperature, copper SWA is still the safer pick. The same conductor decision cascades into aluminum alloy selection for automotive manufacturing wiring harnesses, where the armor and jacket are typically dropped in favour of conduit.
Standards, Listings and Code Compliance
Three marking systems dominate. IEC 60502-1 (LV up to 0.6/1 kV) and IEC 60502-2 (MV 6-30 kV, extended to 36 kV) govern XLPE/PVC/SWA and XLPE/PVC/STA cable exported from China under model numbers YJV22, YJV32, YJLV22 and similar [S5][S6]. GB/T 1838.3-2001 (aligned with the older ASTM B801) covers compacted aluminum conductors, which is the spec cited for the YJHLV(TC90) Al-alloy 16-400 mm² range [S7].
North America runs on UL listings: UL 4 for AC armored cable, UL 1569 for MC (metal-clad) which uses THHN/THWN-2 conductors with a separate green-insulated grounding conductor (not the 16 AWG Al bond of AC), and NEC Article 320/330 for installation rules [S2]. The armor itself is approved as an equipment-grounding path only for AC cable per NEC 250.118(8); for MC, the armor can serve as the path per 250.118(10) but most specs still pull a green ground for redundancy.
Taiwan and ASEAN OEMs in the CENS catalog reference generic "armored cable" with OD 8-16 mm under auto-body and special-cable categories, typically built to JIS C 3401 or customer-private spec rather than UL/IEC marks [S3][S4]. For hazardous-area plants, ATEX 2014/34/EU and IEC 60079-14 add another layer, requiring the armor to be bonded at both ends with a parallel bonding conductor of cross-section per IEC 60079-14. Do not pick SWA as a hazardous-area tray cable without confirming the specific IECEx/ATEX certificate number on the manufacturer's datasheet.
Installation, Failure Modes and Inspection
The three most common field failures on armored cable are: (1) AC cable installed in wet locations without derating, causing THHN insulation breakdown at the 90°C dry rating; (2) SWA pulled above its minimum bend radius (typically 12×OD for SWA, 8×OD for STA), which cracks the inner bedding and lets moisture migrate; (3) armor not bonded at both ends in hazardous-area runs, creating a standing voltage that ignites the atmosphere. The 2026 GoldSupplier AC cable listing explicitly carries a "90C dry only" marking, which exists precisely because inspectors keep finding it in wet conduit [S2].
For direct-buried SWA at 0.6/1 kV, sand bedding and warning tape are mandatory in most jurisdictions; the armor gives mechanical protection but not corrosion protection in aggressive soils, and a PVC or PE oversheath is what isolates the galvanized steel from ground water. Where soil resistivity is below 1000 Ω·cm or where stray DC traction current is present, stainless-steel 304 armor or a HDPE double-sheath SWA is the spec.
For armored optical cable, the failure mode is different: the stainless-steel tube armor is intended to keep the fiber alive after a single crush event, but it does not save the cable from a sustained side load. The 2026 Qingying catalog covers 98 SKUs with a mix of single-mode and multi-mode, indoor/outdoor, and rodent-resistant constructions; selection should track fiber count, fire rating (LSZH vs PVC), and whether the run is indoor riser, outdoor aerial, or direct-buried [S1].
Decision Shortlist and Buyer Checklist
For a 0.6/1 kV LV indoor feeder in a North American plant: UL 4 AC cable with Cu THHN cores, interlocked galvanized steel armor, 16 AWG Al bond wire, 90°C dry only, MOQ 10000 m at US$0.15-15/m [S2]. For a 0.6/1 kV direct-burial European/IEC LV feeder: XLPE/PVC/SWA Cu cable to IEC 60502-1, MOQ 100 m at US$0.20-2.00/m for the 1×2×1.5 mm² instrumentation class, larger MOQ for power [S6]. For a 22-35 kV MV distribution run: XLPE/SWA Cu cable to IEC 60502-2, model YJV22 or YJV32, 1000 m drum, shipped from Tianjin [S5].
For a 0.6/1 kV LV commercial building feeder where weight and cost dominate: YJHLV(TC90) Al-alloy unarmored 16-400 mm², ASTM B Grade B compacted, 15-day delivery on wooden or steel drum [S7]; add SWA or STA armor only if the run is direct-buried. For data and telecom: armored optical cable from a fiber specialist (Dongguan Qingying 98-SKU range), selected on fiber count and mode, terminated via MPO patch cord or fiber optic patch cord, not via cable gland entries designed for copper [S1].
Track three signals before signing the PO: (1) confirm the listing mark matches the inspection regime (UL 4 + NEC 250.118(8) for US, IEC 60502 + CE for EU, GB/T 1838.3 for China domestic); (2) confirm the armor material and oversheath suit the soil/environment (galvanized steel + PVC for benign, stainless 304 or HDPE double-sheath for aggressive); (3) confirm MOQ and drum size match the installer's pulling window, because the cheapest per-metre price often hides a 1000 m minimum that a 300 m run cannot absorb. Misalignment on any one of these is the typical reason armored cable jobs run over budget or fail inspection on first audit.