UL 5128 12 AWG Mica Tape Wire for Industrial Heater Internal Wiring
UL AWM Style 5128 12 AWG mica tape wire, rated 450°C and 300 Vac, is a specific conductor-size configuration within Style 5128’s broader 24 AWG–4 AWG range, commonly specified for fixed, protected internal wiring inside industrial heaters and high-temperature heating equipment. This page focuses on the 12 AWG SKU — its confirmed mica and treated glass braid thickness, installation restrictions, and what still needs to be specified in an RFQ — rather than a general overview of the full Style 5128 range.
The Confirmed UL 5128 12 AWG Construction
| Parameter | UL 5128 |
|---|---|
| UL AWM Style | 5128 |
| Description | Single or multiple conductor with other-than-extruded insulation |
| Featured Conductor Size | 12 AWG |
| Style Conductor Range | 24 AWG – 4 AWG, solid or stranded |
| Temperature Rating | 450°C |
| Voltage Rating | 300 Vac |
| Insulation | Non-extruded mica tape or mica composite |
| 12 AWG Mica Tape Thickness | 15 mils min. average (24–12 AWG group) |
| 12 AWG Treated Glass Braid Thickness | 7 mils min. average (24–12 AWG group) |
| Braid Finish | Glass braid treated with silicone varnish or TFE finish |
| Optional Braid | Stainless steel alloy 304, applied over the treated glass braid |
| UL-Defined Use | Internal wiring of high-temperature equipment where not subjected to repeated flexing and protected from mechanical abuse; acceptability, including current-carrying capacity, determined by UL |
15 Mil Mica Tape and 7 Mil Treated Glass Braid at 12 AWG
12 AWG falls within UL 5128’s 24–12 AWG construction group, which requires non-extruded mica tape or mica composite at a minimum average thickness of 15 mils, covered by a treated glass braid — finished with silicone varnish or TFE finish per the qualified construction — at a minimum average thickness of 7 mils. These values are specific to the 24–12 AWG group; the Style’s 11–4 AWG group carries different requirements (20 mils mica / 15 mils braid) and is not the subject of this page. This page does not convert these thickness values into an invented finished outside diameter — conductor geometry and manufacturing tolerances are order-specific.
Not Subjected to Repeated Flexing — Protected from Mechanical Abuse
The confirmed UL 5128 use states that this construction is for internal wiring of high-temperature equipment where not subjected to repeated flexing and protected from mechanical abuse. This page does not describe UL 5128 12 AWG wire as flexible, high-flex, continuous-flex, or suitable for moving or drag-chain applications, and does not publish a bend radius or flex-cycle rating, since none of these are established by the Style-level record. Installation should route the wire along a fixed path, secured so it is not subject to repeated bending in service, and positioned so it remains protected from mechanical damage during handling, installation, and servicing of the heater equipment.
Optional Stainless Steel 304 Braid — Not Required Armor
UL Style 5128 permits an optional stainless steel alloy 304 braid applied over the treated glass braid. This is an order-specific, optional feature — not a default or required armor layer on every UL 5128 12 AWG wire. This page does not publish abrasion-cycle counts, tensile strength, or crush-resistance figures for this optional braid, as none of these are established by the Style-level record. If your application requires it, specify the optional stainless steel 304 braid when requesting a quotation.
Current-Carrying Capacity Must Be Evaluated Separately
The confirmed UL 5128 Use statement explicitly refers to acceptability, including current-carrying capacity, being determined by UL. This page does not publish a generic current rating for 12 AWG based solely on the Style number. The 12 AWG conductor designation and 300 Vac voltage rating do not by themselves establish allowable current — current-carrying suitability depends on the actual conductor construction and the specific equipment installation, and must be evaluated accordingly rather than read from a table on this page.
Industrial Heater Internal Wiring
The confirmed UL 5128 use is internal wiring of high-temperature equipment under the conditions described above. Realistic commercial contexts for this 12 AWG configuration include industrial heater internal lead routing, heating-element internal connections, thermal-processing equipment internal circuits, and OEM heating-equipment assemblies where a 12 AWG mica-tape construction is specified. Equipment examples are mentioned only as possible contexts where the fixed, protected, mica-tape construction applies — this page does not describe UL 5128 as a resistance heating element, heater coil, or heating cable itself; it is internal wiring, not a heat-generating component.
What UL 5128 Does Not Define for This 12 AWG Order
The Style data does not automatically define: conductor material, conductor plating, strand count, strand diameter, resistance, ampacity, current rating, finished OD, bend radius, standard colour, stock status, MOQ, lead time, reel length, or production capacity. These must be confirmed according to the actual order — none of them are invented on this page.
RFQ Checklist for UL 5128 12 AWG Heater Internal Wire
To request an accurate quotation, please provide:
- UL AWM Style 5128
- 12 AWG
- Solid or stranded
- Conductor material / plating, if specified
- 450°C requirement
- 300 Vac requirement
- Mica-tape construction requirement
- Optional stainless steel 304 braid, if required
- Colour / identification requirement
- Finished OD limit, if controlled
- Installation environment
- Mechanical-protection condition
- Industrial heater application
- Actual operating temperature
- Termination information, if relevant
- Quantity
- Reel or cut-length requirement
- Destination
- Documentation requirement
Applicable RoHS / REACH documentation can be confirmed according to the ordered construction.
See our AWM Wire category, our Mica Tape Wire range, or the UL 5128 Mica Wire Style category for other conductor sizes within this Style.
