UL AWM Style 5334 is a single conductor with other-than-extruded insulation, defined under UL Subject 758. The conductor is insulated with non-extruded composite mica glass and covered with a glass braid treated with silicone varnish or TFE finish. The Style is rated 450°C at 300 Vac across a conductor range of 24 AWG to 4 AWG, in solid or stranded construction. An optional stainless steel alloy 304 braid may be applied over the treated glass braid.
Mica-based insulation systems occupy the top of the AWM temperature range because mica is an inorganic mineral rather than a polymer — it does not soften, melt or thermally decompose in the way that silicone rubber or fluoropolymer insulation eventually does at sustained high temperature. That is what allows a 450°C Style rating. The trade-off is that a non-extruded mica construction behaves differently in handling from an extruded wire, and the UL file attaches a specific use boundary to it: wiring of ovens or similar high-temperature equipment, where protected from mechanical abuse.
UL 5334 Ratings and Construction
| UL Style | 5334 |
| Construction | Single conductor with other-than-extruded insulation |
| UL Subject / Section | 758, Section 5 |
| Temperature rating | 450°C |
| Voltage rating | 300 Vac |
| Conductor range | 24 AWG – 4 AWG, solid or stranded |
| Insulation | Non-extruded composite mica glass with glass braid |
| Mica wall — 24–12 AWG | 17 mils minimum average composite mica glass |
| Braid — 24–12 AWG | 5 mils minimum average treated glass braid |
| Mica wall — 11–4 AWG | 20 mils minimum average composite mica glass |
| Braid — 11–4 AWG | 10 mils minimum average treated glass braid |
| Braid treatment | Silicone varnish or TFE finish |
| Optional shield | Stainless steel, alloy 304, applied as a braid over the treated glass braid |
| Flame rating | Horizontal flame per the UL Style file; VW-1 vertical flame testing available by confirmed construction and agreed order requirement |
| Marking | General, per UL Subject 758 marking requirements |
| Use per UL Style file | Wiring of ovens or similar high-temperature equipment where protected from mechanical abuse and where the acceptability, including current-carrying capacity, has been determined by Underwriters Laboratories Inc. |
24–4 AWG Construction Options
The UL Style range is 24 AWG through 4 AWG, in solid or stranded construction. The insulation thickness requirements fall into two groups: at 24 through 12 AWG the minimum average composite mica glass thickness is 17 mils with a 5 mils minimum average treated glass braid; at 11 through 4 AWG the mica increases to 20 mils with a 10 mils minimum average braid. These are the only fixed Style-level dimensions.
Finished outside diameter is a property of the manufactured construction rather than of the Style, and depends on the conductor stranding, the number of mica layers applied, the braid build and whether the optional stainless steel braid is specified. It is confirmed for the specific order rather than published as a fixed figure. The table below sets out what needs to be settled before an order can be placed.
| Order parameter | Confirmation status |
|---|---|
| AWG size | Within the UL Style range of 24–4 AWG; specify at enquiry |
| Solid or stranded | Both within the UL Style scope; specify at enquiry |
| Applicable thickness group | 24–12 AWG: 17 mils mica / 5 mils braid · 11–4 AWG: 20 mils mica / 10 mils braid |
| Conductor material or plating | Not specified at Style level; requested material or plating subject to quotation and certified-scope confirmation |
| Finished outside diameter | Subject to construction confirmation; depends on stranding, mica build, braid build and optional shield |
| Optional SS 304 braid | Specify at enquiry; affects finished dimensions |
| Marking | Confirmed within the applicable certified scope before production |
| Packaging | Spool length, reel format or cut-to-length; specify at enquiry |
| Required documents | Specify at enquiry; availability confirmed for the ordered construction |
Wiring of Ovens and High-Temperature Equipment
The UL Style 5334 file states the use as wiring of ovens or similar high-temperature equipment where protected from mechanical abuse, and where the acceptability, including current-carrying capacity, has been determined by Underwriters Laboratories Inc.
Two conditions in that statement carry weight in specification. The first is the protection requirement: the wire path must be protected from mechanical abuse along its full routed length by the equipment structure. The second is the acceptability determination — the Style rating alone does not establish that a given construction is acceptable for a given installation, including its current-carrying capacity at the operating temperature. That determination is made for the applicable equipment and the specific ordered construction.
Buyers should confirm that the intended use falls within this boundary before specifying UL 5334. It is not building wire, field wiring, or general external power cable, and it should not be specified where the wire would be exposed to mechanical abuse.
Optional Stainless Steel Alloy 304 Braid
The UL Style 5334 file permits an optional stainless steel braid, alloy 304, applied over the treated glass braid. This is an optional construction rather than a standard feature, and it must be specified at the enquiry stage — it changes the construction, the production process and the finished dimensions of the wire.
Where the equipment design calls for this outer braid, confirm the requirement together with the AWG and conductor specification so that the resulting finished dimensions can be established for the routing and termination hardware in the assembly.
Supply Information for Vietnam and Indonesia
Quotations can be prepared for buyers in Vietnam, Indonesia and other export markets. To receive one, provide the destination country and port, the AWG size, the solid or stranded requirement, the requested conductor material or plating, whether the optional stainless steel braid is required, the quantity, the packaging format, the trade term, and the marking and documentation requirements.
Minimum order quantity, sample availability, packaging, shipping schedule, trade terms and the documents supplied with a shipment are all confirmed in the quotation rather than fixed in advance, since they depend on the specific construction and quantity ordered.
UL Marking and Order Documentation
UL 5334 is supplied as a UL Recognized Component — file on record. Only products bearing the applicable UL Mark should be represented as covered products.
The ordered construction, the actual UL marking applied and the supporting documents that accompany a shipment are confirmed within the applicable certified scope before production. Complete this confirmation at the quotation stage, particularly where the requested construction has not previously been produced or where your own equipment evaluation depends on specific marking or documentation. RoHS and REACH documentation is available on request where applicable to the order.
Related Mica AWM Styles
The full range of this Style is available under the UL 5334 mica wire category. Three adjacent mica Styles are commonly compared against it: UL 5107 (200 or 450°C / 600 Vac, 26 AWG–550 kcmil, mica tape with braid, with a multi-conductor assembly option), UL 5128 (450°C / 300 Vac, 24–4 AWG, non-extruded mica tape, with an optional stainless steel alloy 304 braid), and UL 5335 (450°C / 600 Vac, 22 AWG–4/0 AWG, mica with glass braid, with a multi-conductor assembly option). The differences that drive selection are the voltage class, the conductor range, the insulation build and the stated use — each should be matched against the actual design requirement.
The wider ranges are available under Mica Tape Wire and AWM Wire.
Request a UL 5334 Wire Quote
Send the following with your enquiry so the construction can be confirmed against the applicable certified scope before quotation:
- AWG size
- Solid or stranded construction
- Requested conductor material or plating
- Optional stainless steel alloy 304 braid requirement
- Quantity
- Packaging format
- Destination port
- Trade term
- Wire marking requirement
- Required order documents
- A description of the intended protected oven or high-temperature equipment wiring
