UL 3304 High Voltage Ignition Wire for Gas Ignitor Systems
UL 3304 is a high voltage single-conductor silicone rubber insulated wire with fiberglass braid, recognised under UL’s AWM standard specifically for electronic ignition and gas ignitor applications. Rated at 200°C and 10,000V AC, it is engineered to withstand the combination of high voltage spark discharge, elevated ambient temperature near burner assemblies, and the mechanical stress of installation in tight appliance enclosures — conditions that eliminate virtually every other wire type from consideration.
The silicone rubber insulation provides the required dielectric strength to contain 10,000V ignition pulses without partial discharge or insulation breakdown, while simultaneously maintaining flexibility at the elevated temperatures found in the ignition lead routing path inside gas cooking appliances, space heaters, and industrial burner systems. The fiberglass braid outer covering protects the silicone insulation from mechanical damage during installation and from the thermal radiation of the burner assembly during service.
Produced at our Yangzhou facility under UL Follow-Up Service File No. E333030, UL 3304 wire is manufactured to the construction requirements defined in UL Product iQ — including the 40 mils minimum average silicone rubber insulation thickness and the fiberglass braid specification verified by UL Solutions.
Technical Specifications
| Parameter | Specification |
|---|---|
| Style number | UL AWM 3304 |
| Temperature rating | 200°C continuous |
| Voltage rating | 10,000V AC |
| Conductor material | Solid or stranded round copper, 22 AWG – 12 AWG |
| Insulation material | Extruded silicone rubber (SR) |
| Min avg insulation thickness | 40 mils (1.02 mm) |
| Min insulation at any point | 36 mils (0.91 mm) |
| Outer covering | Fiberglass braid |
| Flame rating | Horizontal flame |
| UL file number | E333030 |
| Colour | Natural fiberglass (off-white), custom available |
| Packaging | 25 m / 50 m / 100 m coils, cut to length from 1 m |
Reprinted from Product iQ with permission from UL Solutions. ©2026 UL LLC. File No. E333030, last updated 2025-12-01.
AWG Reference Table
| AWG | Conductor type | Nominal cross-section | Approx. OD (mm) |
|---|---|---|---|
| 22 AWG | Stranded | 0.325 mm² | 3.5 |
| 20 AWG | Stranded | 0.519 mm² | 3.8 |
| 18 AWG | Stranded | 0.823 mm² | 4.2 |
| 16 AWG | Stranded | 1.31 mm² | 4.7 |
| 14 AWG | Stranded | 2.08 mm² | 5.3 |
| 12 AWG | Stranded | 3.31 mm² | 6.0 |
Key Features
High voltage & thermal
- 10,000V AC rating — handles ignition spark pulse voltages
- 200°C continuous — survives proximity to gas burner assemblies
- 40 mils silicone rubber — thick insulation for HV isolation
- No insulation shrink-back at soldering iron contact
- Self-extinguishing horizontal flame rating
Mechanical & installation
- Fiberglass braid — abrasion resistant outer covering
- Flexible silicone core — easy routing in tight appliance spaces
- Protected from damage during handling and servicing
- 22–12 AWG range covers most ignition lead requirements
- Cut-to-length supply from 1 m for OEM assembly
- UL 3304 recognised — File No. E333030, UL Follow-Up Service, verified 200°C / 10kV / fiberglass braid construction
- Purpose-built for ignition systems — UL use description: “Internal Wiring of Electronic Ignition or similar application in Gas Ranges or Gas or Fuel Oil Burner Systems where protected from damage”
- Silicone rubber insulation — retains dielectric properties across full –60°C to 200°C range; no hardening or cracking over service life
- OEM assembly ready — available pre-cut to specified lengths with stripped and tinned ends for direct harness assembly
Common Applications
Gas range and cooktop ignition systems
The primary application for UL 3304 wire is as the ignition lead connecting the electronic ignition module to the spark electrode on each gas burner of a gas cooking range or cooktop. The wire must route through the appliance body — passing within millimetres of hot burner surfaces — while withstanding the 6,000V to 10,000V spark pulse generated by the igniter at each ignition event. UL 3304 is specified by gas appliance OEMs globally as the standard wire for this application.
Gas water heater and boiler ignition
Used in residential and commercial gas water heaters, boilers, and combination heating units where the ignition lead must withstand continuous exposure to the elevated ambient temperature of the combustion chamber enclosure while reliably delivering ignition spark pulses over a product service life of 10–15 years.
Industrial gas burner systems
Specified for ignition leads in industrial gas burner assemblies used in process heating, drying ovens, kilns, and industrial furnaces where the ignition lead may be exposed to higher ambient temperatures than domestic appliance installations and must meet the more rigorous durability requirements of continuous industrial duty cycles.
Fuel oil burner ignition
Also used as the high voltage lead from the ignition transformer to the spark electrodes in fuel oil burner assemblies for residential and commercial heating boilers, where the combination of oil vapour, elevated temperature, and high voltage ignition pulses defines an extremely demanding operating environment.
Other applications
- Gas barbecue and outdoor heater electronic ignition leads
- Infrared gas heater ignition systems
- Laboratory gas burner ignition leads
- Commercial catering equipment ignition wiring
UL 3304 vs UL 3573 — Choosing the Right Ignition Wire
| Property | UL 3304 (this product) | UL 3573 |
|---|---|---|
| Temperature rating | 200°C | 200°C |
| Voltage rating | 10,000V AC | 10,000V AC |
| AWG range | 22 AWG – 12 AWG | 22 AWG – 12 AWG |
| Insulation | Silicone rubber 40 mils + fiberglass braid | Silicone rubber 30 mils inner + 10 mils outer over braid |
| Construction | Single insulation + braid | Double insulation over braid |
| Use description | Gas ranges / fuel oil burners, protected from damage | Same — alternative dual-layer construction |
| Typical preference | Standard ignition lead specification | Where additional outer insulation layer is required |
Ordering Information
Select AWG size and required length from the product variants above. Pre-cut lengths with stripped and tinned ends available for OEM assembly orders. Standard stock in 18 AWG and 20 AWG; other AWG sizes from 500 m MOQ with 10–15 working day lead time.
UL 3304 compliance documentation available. Material conformance certificates and UL recognition letters supplied on request. Contact us for a factory quotation within 24 hours.
Why Choose CableApex
CableApex manufactures UL 3304 high voltage ignition wire under UL Follow-Up Service (File No. E333030) at our Yangzhou facility. All production runs undergo 100% high-voltage spark testing at 15 kV to verify insulation integrity, with conductor resistance measured on every reel. We supply to gas appliance OEMs, burner manufacturers, aftermarket service parts distributors, and industrial heating equipment builders across more than 40 countries.
