Factory-Direct Supply of Certified Wires and Conductors for Diverse Industrial Applications
THHN THWN Wire 8.0mm² 14mm² 22mm² 30mm² 38mm² 50mm² 60mm² 80mm² 100mm² Philippines
Voltage: 600V, UL-83 Listed, NEC conduit & raceway rated
Conductor: Soft annealed copper, ASTM B-3 solid & ASTM B-8 Class B stranded
Insulation: PVC inner + Nylon (polyamide) outer — THHN dual-layer technology
Temperature: THHN 90°C dry / THWN 75°C wet (same wire, dual rating by environment)
Range: 29 sizes — 4 solid + 25 stranded, 2.0-500mm², AWG/MCM cross-reference
Ampacity: 75°C & 90°C per ≤3 conductors + single conductor free-air
Standard: UL-83, NEMA WC-5, ASTM B-3, ASTM B-8
Product Overview
THHN THWN Wire — Philippine Market is a single-core copper building wire with PVC insulation and Nylon (polyamide) jacket manufactured to ASTM B-3 (soft annealed copper), ASTM B-8 (concentric-lay stranded copper), UL-83 (thermoplastic insulated wire), and NEMA WC-5. The dual designation encodes the application temperature: THHN (Thermoplastic High Heat-resistant Nylon-coated) rated 90°C in dry locations, and THWN (Thermoplastic Heat and Water-resistant Nylon-coated) rated 75°C in wet locations — the same wire, with the rating determined by the installation environment per NEC Table 310.104(A). The Philippine market specification uses metric conductor sizes (mm²) alongside AWG/MCM equivalents with Philippine-specific intermediate sizes (8.0, 14, 22, 30, 38, 50, 60, 80, 100mm²) that bridge the gaps between standard AWG sizes. Rated 600V per UL-83, THHN/THWN is the most widely installed single-core building wire in North America and the Philippines — the default specification for conduit pulls, cable tray runs, and equipment connections in commercial and industrial electrical installations.
The three-layer construction defines THHN technology: (1) a soft annealed bare copper conductor — solid for sizes up to 3.2mm diameter (≈8mm²) and Class B concentric-lay stranded for sizes from 2.0mm² to 500mm², (2) a colour-coded PVC insulation layer providing the primary dielectric strength, and (3) an extruded Nylon (polyamide) outer jacket providing the mechanical toughness — abrasion resistance, chemical resistance to oils and gasoline, and a 105°C melting point that protects the PVC layer from damage during installation pulling. The Nylon jacket is the defining characteristic of THHN/THWN wire versus ordinary PVC building wire — it enables the wire to survive being pulled through conduit with other conductors without insulation damage, a fundamental requirement for UL listing under the NEC's conduit fill regulations. The Philippine market specification includes both solid (diameter-based: 1.6, 2.0, 2.6, 3.2mm) and stranded conductor sizes (mm² from 2.0 to 500mm², with AWG/MCM equivalents for cross-reference to North American electrical codes). Ampacity data is provided for both 75°C (THWN wet-location rating) and 90°C (THHN dry-location rating) per conductor at up to 3 conductors in a raceway and single conductor free-air.
Outer Jacket — Dark green PVC+Nylon, smooth glossy surface with 3D gradient shading, grey border ring at stripped section
Copper Conductor — 19-strand copper bundle in 1-6-12 concentric lay, reddish-brown/orange-tan, exposed at right end where insulation is stripped
Cross-Section — Rightmost tip shows 19-strand circular arrangement confirming Class B concentric stranding
Solid & Stranded Copper (ASTM B-3/B-8)
Solid: 1.6-3.2mm diameter. Stranded: 2.0-500mm², Class B concentric lay. Soft annealed copper — maximum conductivity for conduit and raceway installations per NEC.
PVC Insulation + Nylon Jacket
THHN technology: inner PVC for dielectric + outer Nylon for mechanical. 90°C dry (THHN), 75°C wet (THWN). 600V per UL-83. Gasoline, oil, and abrasion resistant.
Philippine Metric Sizes
Philippine-specific intermediate mm² sizes (8, 14, 22, 30, 38, 50, 60, 80, 100mm²) bridge AWG gaps. AWG/MCM cross-reference for North American engineers.
Dual Ampacity (Wet & Dry)
75°C THWN wet rating + 90°C THHN dry rating. Up to 3 conductors + single conductor free-air. Full 29 rows with insulation resistance data.
29 Sizes to 500mm²
4 solid (1.6-3.2mm) + 25 stranded (2.0mm²-500mm²). 100m-1000m rolls. Export wooden case & pallet.
UL-83 + NEMA WC-5
UL Listed for NEC conduit installations. NEMA standard ensures interchangeability across all North American THHN manufacturers. ASTM B-3/B-8 copper certified.
Technical Characteristics
| Rated Voltage | 600V (UL-83) |
| THHN Rating | 90°C — dry locations only |
| THWN Rating | 75°C — wet locations |
| THWN-2 Rating | 90°C — wet and dry locations (superseding variant) |
| Conductor Material | Soft annealed bare copper — ASTM B-3 (solid), ASTM B-8 (Class B concentric strand) |
| Insulation | PVC inner + Nylon (polyamide) outer — two-layer extrusion |
| Flame Resistance | UL-83 VW-1 vertical flame test |
| Standard | UL-83, NEMA WC-5, ASTM B-3, ASTM B-8 |
Applicable Standards
| Standard | Scope |
|---|---|
| UL-83 | UL standard for thermoplastic insulated wires and cables — the defining North American standard for THHN/THWN construction, testing, and listing. Required for NEC compliance. |
| NEMA WC-5 | National Electrical Manufacturers Association standard for thermoplastic insulated wire — ensures dimensional and performance interchangeability across all manufacturers. |
| ASTM B-3 | ASTM specification for soft or annealed copper wire — the material standard for solid THHN copper conductors up to 3.2mm diameter. |
| ASTM B-8 | ASTM specification for concentric-lay stranded copper conductors — the material standard for Class B stranded THHN conductors from 2.0mm² to 500mm². |
Technical Specifications
Soft annealed copper per ASTM B-3 (solid) and ASTM B-8 Class B concentric strand. PVC+Nylon insulation per UL-83. Ampacity: THWN = 75°C wet rating, THHN = 90°C dry rating. Up to 3 conductors in raceway (standard NEC derating) and single conductor free-air. Philippine market mm² sizes with AWG/MCM equivalents.
| Conductor Size | Stranding (No./mm) | Insul. PVC (mm) | Jacket (mm) | O.D. (mm) | Ampacity 75°C ≤3 / 1 (A) | Ampacity 90°C ≤3 / 1 (A) | Insul. Res. (MΩ/km) | Weight (kg/km) |
|---|---|---|---|---|---|---|---|---|
| Solid Conductor (mm diameter) | ||||||||
| 1.6 | 1/1.6 | 0.51 | 0.10 | 2.9 | — / — | — / — | 0.112 | 20 |
| 2.0 | 1/2.0 | 0.51 | 0.10 | 3.3 | 25 / 30 | 30 / 35 | 0.112 | 30 |
| 2.6 | 1/2.6 | 0.51 | 0.10 | 3.7 | 35 / 40 | 40 / 50 | 0.112 | 50 |
| 3.2 | 1/3.2 | 0.76 | 0.10 | 5.0 | 50 / 60 | 55 / 70 | 0.112 | 75 |
| Stranded Conductor (mm²) — Philippine Market Sizes | ||||||||
| 2.0 (14 AWG) | 7/0.60 | 0.76 | 0.10 | 3.6 | 20 / 20 | 25 / 25 | 0.102 | 25 |
| 3.5 (12 AWG) | 7/0.80 | 0.76 | 0.10 | 4.0 | 25 / 30 | 30 / 35 | 0.092 | 37 |
| 5.5 (10 AWG) | 7/1.00 | 0.76 | 0.10 | 4.7 | 35 / 40 | 40 / 50 | 0.082 | 55 |
| 8.0 (8 AWG) | 7/1.20 | 1.14 | 0.10 | 5.8 | 50 / 60 | 55 / 70 | 0.082 | 79 |
| 14 (6 AWG) | 7/1.60 | 1.14 | 0.10 | 6.8 | 65 / 80 | 75 / 95 | 0.082 | 140 |
| 22 (4 AWG) | 7/2.00 | 1.14 | 0.10 | 8.3 | 85 / 105 | 95 / 125 | 0.082 | 213 |
| 30 (3 AWG) | 7/2.30 | 1.14 | 0.13 | 9.3 | 100 / 120 | 110 / 140 | 0.082 | 288 |
| 38 (2 AWG) | 7/2.60 | 1.14 | 0.13 | 10.2 | 115 / 140 | 130 / 165 | 0.082 | 363 |
| 50 (1 AWG) | 19/1.80 | 1.52 | 0.15 | 12.1 | 130 / 160 | 150 / 190 | 0.082 | 475 |
| 60 (1/0 AWG) | 19/2.00 | 1.52 | 0.15 | 13.3 | 150 / 185 | 170 / 215 | 0.082 | 570 |
| 80 (2/0 AWG) | 19/2.30 | 1.52 | 0.15 | 14.9 | 175 / 215 | 195 / 250 | 0.082 | 760 |
| 100 (3/0 AWG) | 19/2.60 | 1.52 | 0.18 | 16.8 | 200 / 245 | 225 / 285 | 0.082 | 950 |
| 125 (4/0 AWG) | 19/2.90 | 1.52 | 0.18 | 18.5 | 230 / 285 | 260 / 330 | 0.082 | 1,190 |
| 150 (250 MCM) | 37/2.30 | 1.90 | 0.20 | 20.4 | 255 / 315 | 290 / 365 | 0.082 | 1,445 |
| 175 (300 MCM) | 37/2.60 | 1.90 | 0.20 | 22.5 | 285 / 350 | 320 / 405 | 0.082 | 1,680 |
| 200 (350 MCM) | 37/2.60 | 1.90 | 0.22 | 24.2 | 310 / 385 | 350 / 445 | 0.082 | 1,920 |
| 250 (500 MCM) | 37/2.90 | 2.03 | 0.24 | 28.4 | 380 / 470 | 430 / 545 | 0.082 | 2,390 |
| 325 (600 MCM) | 61/2.60 | 2.41 | 0.28 | 31.6 | 420 / 520 | 475 / 600 | 0.082 | 3,100 |
| 375 (700 MCM) | 61/2.80 | 2.41 | 0.28 | 34.1 | 460 / 570 | 520 / 660 | 0.082 | 3,600 |
| 400 (750 MCM) | 61/2.90 | 2.79 | 0.31 | 35.2 | 475 / 585 | 535 / 680 | 0.082 | 3,850 |
| 500 (1000 MCM) | 61/3.20 | 2.79 | 0.34 | 39.5 | 545 / 675 | 615 / 785 | 0.082 | 4,800 |
Packaging & Delivery
| Parameter | Standard |
|---|---|
| Package | 100m/500m/1000m per spool per mm² size; export wooden case & pallet |
| Spool Marking | Manufacturer, THHN/THWN, 600V, UL-83, AWG/mm², length, weight, batch, UL/NEMA marks |
| Colour Options | Standard THHN colours per NEC: black, white, red, blue, green, yellow, brown, orange, grey, purple, pink |
| Outer Protection | Wooden case; Nylon jacket provides transport abrasion protection — the wire's own durable construction minimises packaging requirements |
| Delivery Condition | Factory-new, tested per UL-83, NEMA WC-5, ASTM B-3/B-8, UL Listed, test certificate on request |
Typical Applications
THHN/THWN is the most widely installed single-core building wire in North America and the Philippines — the default specification for conduit, raceway, and cable tray installations:
Commercial Building Wiring
Standard single-core THHN for office, retail, and commercial building conduit installations — the most common building wire type by installed length in North America.
Industrial Conduit & Cable Tray
Nylon jacket enables pulling through long conduit runs with multiple conductors without insulation damage — the key advantage over ordinary PVC wire per NEC fill regulations.
Machine Tool Wiring
Per NFPA 79 for industrial machinery. Gasoline and oil-resistant Nylon jacket survives the harsh chemical environment of machine tool interiors.
Philippine Market
Philippine-specific metric sizes (8-100mm²) — standard THHN wire specified by Philippine electrical engineers and contractors per Philippine Electrical Code.
Service Entrance Cable (THWN)
THWN 75°C wet rating qualifies for outdoor service entrance conduit — the transition from utility service to building distribution board.
Dual Ampacity Circuit Design
75°C + 90°C ampacity columns for up to 3 conductors + single conductor — complete NEC circuit design data on a single specification page.
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Frequently Asked Questions
As a factory, we offer flexible MOQ depending on the cable type. For standard stock items, MOQ is low; for customized specifications, please contact our sales team for a detailed quote.
Yes, Qiangli cables are manufactured in compliance with international standards such as UL, CE, TUV, and VDE. We provide full test reports and certificates upon request.
Absolutely. We have a dedicated R&D team that can customize cable structure, material, color, and printing to meet your specific project needs.
For standard products, lead time is usually 7-15 days. For large-scale project orders or customized products, it typically ranges from 20 to 30 days.
Yes, we provide free samples for most standard cables. You only need to cover the international courier costs. Contact us to arrange your sample shipment.