UL 5359 200°C Single-Conductor Mica Wire Overview
UL AWM Style 5359 covers single or multi-conductor constructions with other-than-extruded insulation, built as mica tape with a glass braid treated with silicone varnish or PTFE finish. The Style is rated 600 Vac with Horizontal Flame and permits either a 200°C or a 450°C temperature rating across a 30 AWG–4/0 AWG conductor range.
This page represents the single-conductor version in the 30–12 AWG construction band at 200°C, for protected fixed internal wiring in heating equipment — individual internal circuit routing where one insulated conductor is specified rather than a cabled assembly.
Style 5359 also permits 450°C constructions. That is stated here so the Style is not misrepresented, but this page is intentionally focused on the 200°C requirement, and temperature selection comes from the actual equipment specification rather than from a preference between the two ratings.
UL 5359 Technical Specifications
| Parameter | Style-level information |
|---|---|
| UL AWM Style | 5359 (UL 758) |
| Description | Single or multi-conductor with other-than-extruded insulation |
| Product page configuration | Single conductor |
| Style temperature ratings | 200°C or 450°C |
| This product page focus | 200°C |
| Voltage rating | 600 Vac |
| Flame | Horizontal Flame |
| Complete Style range | 30 AWG–4/0 AWG |
| Page construction band | 30–12 AWG |
| Conductor form | Solid or stranded in sizes 26–8 AWG; larger sizes stranded only |
| Construction | Mica tape with glass braid treated with silicone varnish or PTFE finish |
| 30–12 AWG mica tape | 16 mil minimum average total thickness |
| 30–12 AWG treated glass braid | 7 mil minimum average thickness |
| Optional shield | 36–30 AWG Type “A” nickel or 27 percent minimum nickel coated copper, according to qualified construction |
| Optional covering | Treated glass braid, according to qualified construction |
| Optional multi-conductor assembly | Two or more insulated conductors cabled together, maximum OD 1.500 inches |
| Official Use | 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 Underwriters Laboratories Inc. |
Why 30–12 AWG Is Used as One Band
The 30–12 AWG grouping in the product title is not an AWG split created for search. It is a construction band defined inside the Style: every size from 30 AWG through 12 AWG carries the same stated minimum average requirements of 16 mils total mica tape layers and 7 mils treated glass braid.
Conductor size alone is not enough to make two constructions different products, which is why this page covers the whole band rather than one size. What the shared band does not mean is that everything else matches across it — finished OD, conductor resistance, strand construction and termination all still vary with the actual size and the ordered construction.
The Three UL 5359 Construction Bands
| Conductor size | Min. avg. total mica tape | Min. avg. treated glass braid |
|---|---|---|
| 30–12 AWG (this page) | 16 mils | 7 mils |
| 11–4 AWG | 20 mils | 15 mils |
| 3–4/0 AWG | 25 mils | 20 mils |
The two larger bands appear here only so buyers can see how the Style is structured. They are not alternative recommendations, and greater specified construction thickness in a larger band is not presented as better protection, higher capacity or better electrical performance.
Do Not Add the Mica and Braid Figures Together
The mica tape and the treated glass braid are separate construction elements with separate minimum average thickness requirements. 16 and 7 do not combine into a 23 mil finished insulation, and the same applies to the other bands.
Those sums are not a radial wall thickness, a total finished insulation, a guaranteed wall or a finished outside diameter. Both figures are minimum averages for the elements themselves, and any dimension a drawing controls is checked against the approved construction rather than calculated from the Style table.
Mica Tape With Glass Braid Treated With Silicone Varnish or PTFE Finish
That full phrase is the verified construction description, and the length of it is the point — each part carries meaning that a shorter label would lose.
A silicone varnish treatment on the braid does not make this a silicone-insulated wire, and it is not extruded silicone rubber. A PTFE finish on the braid does not make PTFE the primary insulation. The construction is also not fiberglass-only insulation: the mica tape is the separate insulating element beneath the braid. Where the BOM controls which treatment applies, state it so the qualified construction can be confirmed.
Single-Conductor Positioning
The Style permits both single and multi-conductor constructions, and this page represents the single-conductor version — one insulated conductor routed individually inside the equipment.
That is a page scope, not a Style limitation. Nothing here should be read as meaning every Style 5359 construction is single-conductor. Where the requirement is a cabled assembly, state that explicitly in the enquiry.
600 Vac Is an AC Rating
The Style rating is 600 Vac and is written that way wherever electrical precision matters, rather than as an ambiguous “600V.” It is not restated as 600 Vdc, as a 600V peak value, as an impulse voltage or as a dielectric withstand voltage without separate documentation establishing such a value.
Conductor Form Is Size-Dependent
The Style states the range as 30 AWG–4/0 AWG, solid or stranded in sizes 26–8 AWG, larger sizes stranded only. That size-dependent restriction is preserved here rather than flattened into “solid or stranded” across the whole range.
One consequence is worth noting for this page: the 30–12 AWG band overlaps the 26–8 AWG solid-or-stranded window but is not identical to it, and the Style wording does not explicitly define conductor form for 30–27 AWG. Nothing is invented to fill that gap. Where solid or stranded is controlled, state which is required; strand count, strand diameter and lay length are not established at Style level.
Conductor Material and Finish Are RFQ Fields
The Style information used here establishes conductor size and the size-dependent form restriction. It does not establish one universal primary-conductor material or plating, so bare copper, tinned copper, nickel-plated copper and nickel conductor are none of them assumed for this page.
The nickel and nickel-coated-copper wording that appears in the Style belongs to the optional shield field, not to the primary conductor, and the two should never be merged in a BOM line. Where the customer drawing controls conductor material or finish, request it explicitly.
Not Subjected to Repeated Flexing
The official Use limits this Style to internal wiring not subjected to repeated flexing. That condition defines what the product is for.
Style 5359 is therefore not offered here as high-flex wire, continuous-flex wire, drag-chain cable, robotic cable, a moving heater lead or a moving door cable. Bending during installation is not repeated flexing, and routine assembly bending does not turn a fixed-wiring product into a flexing one. No minimum bend radius, flex-cycle rating or bending-life specification is published on this page.
Where the lead moves repeatedly during normal equipment operation, the application requires separate review rather than an assumption that this Style fits. State whether movement occurs when sending the enquiry.
Protected From Mechanical Abuse
The second Use condition requires protection from mechanical abuse, placing the obligation on the end equipment rather than on the wire.
Neither the mica tape nor the glass braid is presented here as establishing suitability for exposed external routing, uncontrolled abrasion, crushing, impact, sharp-edge contact or open field wiring, and no mechanical-protection rating is claimed. Where the routing path crosses a metal edge, a pass-through or a clamped position, the protection method belongs in the equipment design and is worth describing in the enquiry.
Current-Carrying Capacity Is Not Published Here
The official Use refers to acceptability, including current-carrying capacity, as something determined. That describes how the Style is evaluated; it is not an ampacity table, and the Style data does not establish one.
No amperes by AWG, heater wattage by conductor size, power recommendation, furnace kW figure or load limit appears on this page. Actual conductor size comes from the equipment engineering requirement.
Optional Shield
The Style provides an optional shield described as 36–30 AWG Type “A” nickel or 27 percent minimum nickel coated copper. It is a distinct optional construction field, separate from the primary conductor.
No quantified performance is attributed to it here. EMI shielding, RFI attenuation, grounding effectiveness and abrasion protection are not established by the Style-level information and would require separate construction documentation. Where a shield is required, state yes or no and supply the controlling specification.
Optional Covering
Style 5359 separately lists an optional covering: a treated glass braid. This is its own construction field, distinct from the insulation construction, from the shield, and from any overall braid on a multi-conductor assembly.
The distinction matters in an enquiry because the phrase “treated glass braid” appears in two places in this Style — once as part of the insulation construction over the mica tape, and once as an optional covering. Asking for “a glass braid” without saying which field is meant leaves the requirement ambiguous. No covering thickness, protection rating or mechanical-performance claim is published here beyond what is documented.
Optional Multi-Conductor Assembly
Two or more insulated conductors as described may be cabled together with a maximum OD of 1.500 inches, and a mica-glass binder and/or fiberglass fillers may be employed.
This is a Style-supported alternative, mentioned for completeness. This page is deliberately the single-conductor product, so a cabled-assembly requirement should be stated as such in the enquiry.
Finished OD Is Not Derived From the Style Table
Finished OD is not calculated here from the 16 mil mica and 7 mil braid figures, and the Style table does not establish one universal finished OD for each AWG.
Where mechanical fit matters, request conductor AWG, nominal OD, maximum OD, dimensional tolerance, feedthrough dimensions, sleeve dimensions and the terminal interface, taken from the approved construction.
Termination Requirements
The Style does not establish one universal terminal type, crimp lug, connector, strip length, ceramic terminal block or termination method, and none are invented here. Where a prepared lead is required, supply the customer drawing or terminal part number. Termination compatibility stays a separate question from the UL wire Style rating.
Official AWM Use Boundary
The official Use for Style 5359 is: 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 Underwriters Laboratories Inc.
Protected fixed internal wiring sections of thermal equipment are buyer application contexts where an appropriate Style 5359 construction may be evaluated when the actual design satisfies that Use boundary. Heating equipment is application context, not a certification statement: this is not UL approved heater wire, not a UL-certified heating-element lead, not a universally approved oven wire, and not an external furnace cable.
What UL 5359 Does Not Automatically Define
- Primary conductor material and conductor plating
- Strand count, strand diameter and lay length
- Conductor resistance and ampacity
- Finished OD and dimensional tolerance
- Minimum bend radius and flex-cycle life
- Terminal and connector compatibility
- Shielding effectiveness
- Covering thickness and mechanical performance
- Reel length, MOQ, stock and production lead time
Common RFQ Mismatch Risks
- “UL5359” requested with no temperature stated. The Style supports 200°C or 450°C.
- AWG omitted. Three construction bands sit inside 30 AWG–4/0.
- Same mica and braid thickness assumed across all sizes. The requirement changes by band.
- 16 + 7 mil treated as the finished wire wall. Separate minimum averages, not a dimension.
- Multi-conductor assumed. Both single and multi-conductor constructions exist under this Style.
- Repeated flexing expected. The Use excludes it.
- Mechanical-protection information omitted. The Use requires it from the equipment design.
- Optional shield material read as conductor material. Two separate construction fields.
- Dimensional limits omitted. Fit cannot be confirmed without maximum OD.
- Ampacity requested from the Style number. The Style does not establish one.
Each of these leaves the enquiry matching more than one qualified construction, or one the Use conditions do not support — issues that surface at approval rather than at quotation, when they are more expensive to fix.
RFQ Checklist
- UL AWM Style 5359
- Single-conductor requirement
- Required temperature: 200°C
- Required voltage: 600 Vac
- Conductor AWG
- Conductor material / finish, if controlled
- Conductor form where applicable
- 30–12 AWG construction band
- Finished OD / maximum OD, if controlled
- Optional shield required: yes / no
- Optional covering required: yes / no
- Fixed routing condition
- Repeated movement present: yes / no
- Mechanical protection method
- Terminal / connector information
- Cut length or reel requirement
- Quantity, packaging and destination
- Documentation requirements
- Actual heating-equipment internal-wiring context
Applicable RoHS / REACH documentation can be confirmed according to the ordered construction. UL marking is applied according to the confirmed ordered construction, and material is supplied as UL-recognized component wire under qualified manufacturing scope.
