UL 5476 11–4 AWG Mica Tape Wire, 21/15 Mil 450°C 600V for Protected Internal Wiring

UL 5476 11–4 AWG Mica Tape Wire for Protected Internal Wiring

UL AWM Style 5476 is a single or multiple conductor with other-than-extruded insulation, rated 450°C and 600 Vac with a Horizontal flame classification. Its insulation is mica tape with glass braid, the braid treated with silicone varnish or TFE finish, and its thickness requirements are set by conductor-size group. For 11 AWG through 4 AWG, the Style requires a minimum average of 21 mils for the total mica tape layers and 15 mils for the treated glass braid. The Use is internal wiring where not subjected to repeated flexing and protected from mechanical abuse.

This page covers that 11–4 AWG single-conductor construction. Cabled assemblies are covered on the UL 5476 Multi-Core Mica Glass Braid Cable page, the finer 30–12 AWG group on its own UL 5476 product page, and the broader Style overview in the UL 5476 Mica Wire category.

Verified UL 5476 Technical Specifications

Four points in this table need clarification. First, the millimetre values are arithmetic conversions (1 mil = 0.0254 mm), not separate UL specifications. Second, both thickness values are minimum averages; the record states no minimum-at-any-point value. Third, unlike several other mica Styles, the Style 5476 conductor field does not restrict larger sizes to stranded construction; solid or stranded applies across the range. Fourth, the shield materials are for the optional shield only; the record does not state the primary conductor material or plating.

11–4 AWG, 21/15 Mil Construction

For every size from 11 AWG through 4 AWG, a Style 5476 conductor carries two separate minimum-average requirements: 21 mils for the total mica tape layers and 15 mils for the treated glass braid. These values apply equally across the group, whether the conductor is solid or stranded.

The conductor field reads “30 AWG – 4/0 AWG, solid or stranded.” Both forms are therefore permitted at 11, 10, 9, 8, 7, 6, 5 and 4 AWG. The stranded-only rule found in some other mica Style records is not part of Style 5476 and is not applied here. Which form, conductor material, plating and stranding detail apply to an order is confirmed for the qualified ordered construction; not every combination is assumed to be available.

The two thickness values do not establish a finished diameter, current capacity, dielectric strength, mechanical strength, flexibility, bend radius or compactness, and none of these is derived from them here.

21 Mil Minimum-Average Mica Tape Layers

The record’s thickness table lists “Total Mica tape layers” with a minimum average thickness of 21 mils (0.53 mm by unit conversion) for 11–4 AWG.

• “Total mica tape layers”: the requirement applies to the combined thickness of all mica tape layers, not to a single tape.
• “Minimum average”: the average thickness of those combined layers must not fall below 21 mils.

The 21-mil figure is not nominal, exact or a minimum at any point, and no tolerance is attached. The actual mica thickness of an ordered construction may exceed it. The record does not specify the number of tape layers, tape width or overlap. The insulation is mica tape; it is not described as composite mica glass, MI cable, mineral-insulated cable, silicone rubber, PTFE or ceramic-insulated wire.

15 Mil Minimum-Average Treated Glass Braid

Over the mica tape is a glass braid, listed in the record as “Glass braid treated with silicone varnish or TFE finish,” with a minimum average thickness of 15 mils (0.38 mm by unit conversion) for 11–4 AWG. It is a minimum average only; it is not nominal or exact, and no point minimum is stated.

Silicone varnish and TFE finish are permitted treatments of the glass braid. They are not primary insulation: silicone varnish does not make the wire silicone rubber wire, and TFE finish does not make it PTFE-insulated wire. The record does not tie either treatment to a temperature class and makes no statement about relative abrasion, chemical, flexibility, dielectric or service-life behaviour. Where a drawing requires one treatment, it is confirmed for the ordered construction.

The mica and braid values are separate requirements and are not simply added to obtain a finished insulation diameter. Where a drawing controls finished diameter or tolerance, it is confirmed against the ordered construction.

UL 5476 Thickness Schedule Across the Full Style Range

Two points in this table need clarification. First, each group’s values apply only to that group: 12 AWG uses 17/7, 11 AWG and 4 AWG use 21/15, and 3 AWG uses 26/20. Second, all values are minimum averages, and the record attributes no performance difference to the larger values. The 11–4 AWG group, with its 21/15 mil requirement, remains the subject of this page.

450°C, 600 Vac and Horizontal Flame

The rating field reads “450 deg C, 600 Vac, Horizontal flame.” Style 5476 is rated 450°C; the record does not describe the rating as continuous, sustained or long-term, and no such qualifier is added. Because of this rating, UL 5476 can be described as 450°C mica tape wire for protected internal wiring, without implying approval for any particular equipment.

600 Vac is the voltage rating. No DC value applies, and the rating does not make the wire a power-distribution or main-feed conductor or establish suitability for any particular supply system. Horizontal flame is the flame classification; VW-1, FT1, FT2 and vertical flame are not Style-wide properties.

Optional Intermediate Material Between Mica Tape and Glass Braid

The Style record includes an optional provision stating that a material “may be applied between Mica Tape and Glass Braid,” with the material detail given on a facing page that is not part of the data used here. This page therefore describes it only as an optional intermediate material permitted between the mica tape and glass braid according to the qualified construction. Its composition is not named, and no adhesion, delamination, thermal-cycling, flex, mica-movement or dielectric effect is attributed to it. Whether it is required, and what it is, is confirmed for the qualified ordered construction.

Protected Internal Wiring — No Repeated Flexing

The Use reads: “Internal wiring where not subjected to repeated flexing and protected from mechanical abuse, and where the acceptability, including current-carrying capacity, has been determined by UL, LLC.” For 11–4 AWG single conductors:

• Internal wiring: the Use does not name equipment types. UL 5476 is not described here as approved for furnaces, kilns, glass equipment, aerospace systems or heaters; any such context depends on evaluation of the actual equipment design and routing.
• Not subjected to repeated flexing: the wire is not flexible, high-flex, continuous-flex, drag-chain, robotics or moving cable, and no flex-cycle data is given.
• Protected from mechanical abuse: building, field, exposed, tray, direct-burial, outdoor and mechanically exposed equipment routing fall outside the Use. The glass braid, optional shield and optional assembly covering do not remove this condition.
• Acceptability, including current-carrying capacity, determined by UL: AWG size does not establish circuit function. No current rating or equipment load is assigned to 11, 10, 8, 6 or 4 AWG, and this group is not described as high-power, high-current, power-feed, heater-feed or bus wire.

Optional Shield and Multi-Conductor Provisions

The Shield entry reads: “Optional – 36-30 AWG Type “A” Nickel or 27 percent minimum nickel coated copper.” These are shield materials, not the primary conductor material. The record establishes no EMI attenuation, shielding effectiveness, transfer impedance, corrosion, mechanical, abrasion or thermal-shielding performance for the shield.

The Assembly entry permits two or more conductors described by the Style to be cabled together with a maximum overall diameter of 1.500 inches, with a mica glass binder and/or fiberglass fillers and an optional overall treated glass braid. This page covers the single-conductor form; buyers seeking a multiple-conductor assembly can refer to the UL 5476 Multi-Core Mica Glass Braid Cable page. No conductor counts are given here.

What Style 5476 Does and Does Not Define

For 11–4 AWG, the Style record defines the rating (450°C, 600 Vac, Horizontal flame); the conductor form (solid or stranded); the insulation (mica tape with glass braid); the 21-mil minimum-average total mica tape layers; the 15-mil minimum-average treated glass braid; the braid treatments; the optional intermediate material, shield and assembly; the marking field (General); and the Use.

The Style record does not define, in the data used here:

• conductor material, plating or strand construction
• conductor resistance or current rating
• minimum-at-any-point thicknesses
• finished outside diameter or tolerance
• the composition of the optional intermediate material
• shielding performance
• bend radius, flex life or service life

Common Procurement Errors

• Applying the 17/7 mil values of 30–12 AWG to 11 AWG, or the 26/20 values of 3 AWG to 4 AWG.
• Treating 21 or 15 mils as nominal or point minimums.
• Importing a stranded-only rule from another Style.
• Naming or assigning performance to the optional intermediate material.
• Reading a shield material as the conductor material.
• Assigning a current rating or power function by AWG.
• Describing the rating as continuous or adding a DC value.
• Specifying the wire for repeated flexing or unprotected routing.

How to Specify UL 5476 11–4 AWG Mica Tape Wire in an RFQ

The Style fixes the rating, conductor forms, the 21/15 mil minimum averages, the braid treatments, the optional provisions and the Use. The following should be stated by the buyer and confirmed for the ordered qualified construction, not filled with assumed values:

• exact AWG within 11–4 AWG
• solid or stranded requirement
• conductor material and plating requirement
• detailed stranding requirement, if controlled
• finished OD or tolerance, if controlled
• Silicone Varnish or TFE Finish requirement, if controlled
• whether the optional intermediate material is required
• optional shield requirement
• single- or multi-conductor requirement
• marking requirement
• equipment type
• internal routing condition
• confirmation that repeated flexing does not occur
• mechanical-protection arrangement
• current requirement
• quantity
• packaging
• documentation requirements

UL Marking and Documentation

Style 5476 wire is supplied as UL-recognized component wire where supplied under qualified manufacturing scope. The marking field of the Style record reads “General”; it does not prescribe a fixed legend. UL marking is applied according to the confirmed ordered construction and should be confirmed at the order stage.

Applicable RoHS / REACH documentation can be confirmed according to the ordered construction. CE, UKCA, CSA, FT1, VW-1, CPR, VDE, DIN, EN and IEC are not declared for this product.

Commercial, origin, compliance and transport documents are identified during quotation and confirmed according to the order.

Related Categories

• UL 5476 Mica Wire
• Mica Wire
• AWM Wire