UL AWM Style 3239 — High-Voltage DC Internal Wiring Wire
UL AWM Style 3239 is a high-voltage DC appliance wiring material covered under UL Subject 758, Section 3. The Style supports multiple conductor types and a range of extruded or non-extruded thermoplastic and thermosetting insulation systems. Ceiling ratings stated in the Style file are 200°C maximum and 60,000 Vdc maximum; actual temperature and voltage ratings for any specific ordered construction may be lower and are defined by the individual UL construction documentation. All construction parameters — insulation system, voltage class, temperature class, and optional shield or jacket — must be confirmed against the applicable UL construction file before ordering.
CableApex supplies UL AWM Style 3239 wire sourced from a UL Recognized Component manufacturer — file on record. Construction-specific UL documentation can be provided in accordance with order requirements. Buyers are advised to confirm the required construction details prior to enquiry.
Key Parameters — UL AWM Style 3239
| Parameter | Value per UL Style 3239 File |
|---|---|
| UL Style Number | AWM 3239 |
| UL Subject / Section | Subject 758, Section 3 |
| Temperature Rating (ceiling) | 200°C maximum — individual construction ratings vary; confirm against ordered construction |
| Voltage Rating (ceiling) | 60,000 Vdc maximum — individual construction ratings vary; confirm against ordered construction |
| Conductor — Copper or Nickel | 24–10 AWG, solid or stranded |
| Conductor — Aluminum | 12–10 AWG, solid or stranded — limited to 90°C maximum operating temperature |
| Conductor — Resistance Wire | 27–20 AWG, solid or stranded |
| Conductor — Coated High-Strength Copper | 24–10 AWG, solid or stranded; minimum 90% conductivity |
| Copper Conductor Finish Options | Bare, tinned, silver-plated, nickel-plated, heat-bonded, or overcoated |
| Insulation System | Extruded or non-extruded thermoplastic and/or thermosetting — material and wall thickness are construction-dependent |
| Wall Thickness | Construction-dependent; confirm against the specific ordered UL construction file |
| Shield | Optional, construction-dependent |
| Covering / Jacket | Optional, construction-dependent |
| Flame Rating | Horizontal flame and VW-1 flame |
| UL Recognition | UL Recognized Component — file on record |
| Permitted Use (per UL Style file) | Internal wiring of TV receivers; or internal wiring where the acceptability has been determined by Underwriters Laboratories |
Conductor Types and Construction Options
UL AWM Style 3239 covers four conductor material categories with defined AWG ranges. The table below summarises the conductor options as stated in the Style file.
| Conductor Type | AWG Range | Stranding | Notes |
|---|---|---|---|
| Copper or Nickel | 24–10 AWG | Solid or stranded | Bare, tinned, silver-plated, nickel-plated, heat-bonded, or overcoated |
| Aluminum | 12–10 AWG | Solid or stranded | Limited to 90°C maximum operating temperature |
| Resistance Wire | 27–20 AWG | Solid or stranded | — |
| Coated High-Strength Copper | 24–10 AWG | Solid or stranded | Minimum 90% conductivity |
The insulation system covers extruded or non-extruded thermoplastic and thermosetting materials. Specific insulation material, wall thickness, and resulting dielectric and thermal performance are defined at the individual construction level. Optional shield, covering, and jacket constructions are available depending on the specific ordered specification. Buyers should provide their required voltage class, temperature class, and conductor specification when requesting a quotation so that the available construction can be confirmed against the UL Style 3239 file.
Permitted Applications
The UL Style 3239 file designates this Style for internal wiring of TV receivers and for other internal wiring where the acceptability has been determined by Underwriters Laboratories. In practice, UL AWM Style 3239 constructions are evaluated for use in protected internal high-voltage DC wiring within equipment where a UL or equivalent equipment-level certification has established the acceptability of the wire for the specific installation and voltage class.
Equipment categories in which UL AWM Style 3239 constructions are commonly evaluated for internal wiring include high-voltage DC power supply assemblies, industrial high-voltage DC test and measurement equipment, laboratory research and calibration equipment operating in the high-voltage DC range, and vacuum equipment with internal high-voltage DC circuits. In each case, the equipment-level evaluation by the applicable certification body determines whether the specific UL AWM 3239 construction is acceptable for that installation.
UL AWM Style 3239 is not designated for field wiring, utility distribution, external interconnect cabling, building wiring, or any use outside protected internal equipment wiring without a specific equipment-level acceptability determination.
Engineering Notes for Procurement Buyers
- Construction-dependent ratings — confirm before specifying: UL AWM Style 3239 does not carry a single fixed voltage or temperature rating applicable to all constructions. The Style file states ceiling values of 200°C and 60,000 Vdc; any specific ordered construction may be rated considerably lower. Before specifying this Style, buyers should identify the required voltage class and temperature class, then confirm that the available construction satisfies those requirements. CableApex can provide UL construction documentation in accordance with order requirements upon request.
- Insulation material is construction-dependent: The Style file describes the insulation system as extruded or non-extruded thermoplastic and/or thermosetting, without defining a single insulation material at the Style level. The insulation material, wall thickness, and resulting dielectric performance of the ordered construction must be confirmed prior to procurement. Buyers with specific requirements for flexibility, dielectric strength, or temperature performance at the insulation level should confirm the available construction options with CableApex before ordering.
- Aluminum conductor temperature restriction: Constructions using aluminum conductors under UL AWM Style 3239 are limited to a 90°C maximum operating temperature per the Style file, regardless of any higher ceiling shown at the Style level. Equipment designers specifying aluminum-conductor constructions must account for this restriction in the thermal design of the installation.
- Termination requirements for high-voltage DC wiring: Internal high-voltage DC wiring installations require termination hardware appropriate to the voltage class of the evaluated construction. Creepage and clearance distances, termination insulation integrity, and compatibility with the insulation material of the ordered construction must be evaluated at the equipment level in accordance with the applicable equipment safety standard. Termination requirements are not determined by the AWM Style file and must be addressed separately in the equipment design.
What to Confirm Before Quotation
Because UL AWM Style 3239 covers a wide range of constructions with varying voltage and temperature ratings, buyers are asked to confirm the following details before requesting a quotation:
- Required voltage class (Vdc)
- Required temperature class (°C maximum)
- Conductor material: copper, nickel, aluminum, resistance wire, or coated high-strength copper
- Conductor AWG and stranding (solid or stranded)
- Copper conductor surface finish, if applicable (bare, tinned, silver-plated, nickel-plated, other)
- Insulation material and wall thickness per the specific UL construction
- Shield, covering, or jacket requirements, if any
- Quantity (metres), delivery terms (CIF / FOB), and target lead time
Providing these details at the time of enquiry allows the available UL AWM Style 3239 construction to be confirmed against the applicable file, and enables an accurate quotation to be issued. Enquiries without a defined construction specification may require additional technical clarification before a quotation can be issued.
MOQ, Lead Time and Export Documentation
Minimum order quantity: 100 metres per construction. Standard B2B quotation response: within 12 hours of confirmed specification receipt.
Export documentation for UL AWM Style 3239 orders typically includes: Commercial Invoice, Packing List, Certificate of Origin (CCPIT stamp), Bill of Lading, and UL Recognition reference documentation in accordance with the ordered construction. RoHS and REACH documentation is available on request where applicable to the order. Packaging: spools or reels per customer specification. HS Code: 8544.49. Production lead time: confirm at quotation stage based on the ordered construction and quantity.
Related UL AWM Styles
Buyers evaluating UL AWM Style 3239 commonly cross-reference adjacent Styles for internal wiring at different voltage and temperature classes: UL AWM 10269 (up to 105°C / 1,000 Vac or 1,250 Vdc, PVC insulation, 30 AWG–2000 kcmil — lower-voltage class internal wiring alternative); UL AWM 3304 (200°C / 10,000 Vac, silicone rubber with fiberglass braid, 22–12 AWG — high-voltage AC internal wiring for ignition systems); UL AWM 3573 (200°C / 10,000 Vac, dual-layer silicone with fiberglass braid or serve, 22–12 AWG — ignition lead wire alternative); and UL AWM 3271 (125°C / 600 Vac or 750 Vdc, XLPE insulation, 30 AWG–2000 kcmil — motor lead and lower-voltage appliance internal wiring).
