UL 3271 125°C 600V XLPE Motor Lead Wire

UL 3271 125°C 600V XLPE Motor Lead Wire

This page covers UL AWM Style 3271, a single conductor with extruded XLPE insulation rated 125°C, 600 Vac and 750 Vdc. It is written for motor, appliance and equipment OEM engineering and procurement teams whose drawing, BOM or wire specification calls for Style 3271.

Two things distinguish this Style from most PVC and silicone AWM constructions. Its official Use names motor leads explicitly: “For use as Motor Leads or Internal Wiring of appliances.” And the record permits an optional semi-conductive polymeric layer over the conductor, which is a construction option rather than a standard feature.

The conductor range runs from 30 AWG to 2000 kcmil in solid or stranded form, the flame designation is Horizontal Flame, Marking is General, and the insulation wall requirement changes across six conductor-size groups.

Confirmed UL Style 3271 Construction and Ratings

Ten points to clarify about the tables above:

1. The temperature rating is 125°C, stated without a duty qualifier.
2. The AC and DC ratings are listed separately as the record states them. They are not combined into an AC/DC rating or written as 600/750 V.
3. 750 Vdc is a rating for the wire, not an equipment system rating.
4. 2500 volt peak – For Electronic Use Only is an optional tag indication, not a normal working-voltage rating.
5. The semi-conductive polymeric layer is optional, and it may be extruded or non-extruded. It is supplied only where specified and confirmed.
6. The insulation wall requirement depends on the conductor size group, and values from one group do not apply to another.
7. Each group gives a minimum average thickness and a minimum thickness at any point. These are two independent minimums, not nominal or exact wall values.
8. Conductor material, plating, strand count, strand diameter and lay length are not defined by the Style.
9. Finished OD, OD tolerance, conductor resistance, metric cross-section and ampacity are not defined by the Style.
10. 30 AWG–2000 kcmil is the Style scope, not a stock list, and availability of a given size and configuration is confirmed per enquiry.

The Optional Semi-Conductive Layer

The record permits an extruded or non-extruded semi-conductive polymeric layer over the conductor. Three points follow for procurement.

It is optional. A Style 3271 construction does not include it unless the buyer specifies it, so an enquiry that requires the layer must say so explicitly, and an enquiry that does not mention it will be quoted without it.

Both forms are permitted. Where a drawing controls whether the layer is extruded or non-extruded, that requirement should be stated so the qualified construction can be confirmed.

The record assigns it no performance function. This page therefore does not describe the layer as providing stress control, corona resistance, improved dielectric behaviour, inverter-duty capability or any electrical or mechanical property, and it is not presented as a feature of the Style at large. If a buyer’s design relies on a defined function, that belongs in the drawing and is reviewed against the proposed construction.

Insulation Wall by Conductor Size Group

Style 3271 sets the extruded XLPE wall in six groups, from 30 mils minimum average and 27 mils minimum at any point at 30–9 AWG, up to 95 mils minimum average and 86 mils minimum at any point at 1001–2000 kcmil. A specification quoting one wall figure for the whole Style has collapsed the table and lost the requirement that applies to the ordered size.

Within each group the two values apply together: the average wall must meet the first figure, and no point of the wall may fall below the second. Neither is a nominal build.

Minimum wall values do not produce a finished outer diameter. Actual OD depends on the conductor material and form, the actual conductor dimensions, the applicable insulation group, whether the optional semi-conductive layer is applied, the XLPE extrusion and manufacturing tolerance. Where motor slot entry, lead-out clearance, grommet fit or terminal entry is controlled, state a maximum finished OD and OD tolerance in the RFQ rather than calculating one from the table.

The insulation material is extruded XLPE, also written as cross-linked polyethylene. This page does not restate it as PVC, silicone or a fluoropolymer, and does not attribute chemical, oil or solvent resistance to it, since the record contains no such rating.

Ratings

The temperature rating is 125°C. This page does not describe it as continuous or continuous-duty, does not claim any higher figure, and derives no service life, thermal cycling count, insulation class or thermal margin from it.

The record lists 600 Vac and 750 Vdc. Both are wire ratings. Writing them as 600 V AC/DC, 600/750 Vac or 750 Vac misstates the record, and the DC figure is not presented as a motor drive bus rating, an equipment system rating or an inverter output rating. Tags may indicate “2500 volt peak – For Electronic Use Only”, and both qualifiers stay attached whenever that tag is cited: it is a peak indication for electronic use, not a working voltage. No pulse, impulse or partial-discharge performance is claimed from it.

The flame designation is Horizontal Flame. VW-1, FT1 and vertical flame designations are not part of this record.

Conductor Range and Construction

The Style scope runs from 30 AWG to 2000 kcmil in solid or stranded form, covering everything from fine internal leads to heavy motor lead sizes. Scope is not availability: not every size or configuration is regularly produced or held, and a given construction is confirmed per enquiry.

Conductor size assigns no circuit function or current capacity. The record gives no ampacity, and none is inferred here from conductor size, the 125°C rating or either voltage figure. Motor current, duty and winding connection requirements are determined by the motor design and the applicable approval process.

The following are RFQ fields rather than Style values:

• solid or stranded form
• conductor material
• plating or surface finish
• strand count, strand diameter and lay construction, where controlled
• maximum conductor resistance, where controlled
• metric cross-section, where a drawing specifies mm² rather than AWG or kcmil

No stranding class, flexibility grade or flex life is applied to Style 3271 here, since the record contains none.

Official Use: Motor Leads or Internal Wiring of Appliances

The official Use is “For use as Motor Leads or Internal Wiring of appliances.” Both categories belong to the Style, and dropping either one narrows it incorrectly.

Motor lead service is therefore within the Use as written. That does not make the Style a motor design specification: it establishes no winding temperature class, no inverter-duty or variable frequency drive rating, no partial-discharge performance, no repeated-flexing capability and no suitability for a particular motor type. Those are determined by the motor design and its own approval process.

The Use is also not extended to building or mains installation wiring, field wiring, conduit or tray installations, external motor supply cable between equipment, portable cord, VFD output cable between drive and motor, or general power distribution. Compliance of a finished motor, appliance or assembly is established at the equipment level and is not conferred by the Style designation of one wire.

How to Specify UL 3271

A Style designation is a construction requirement, not a complete purchase specification. A complete enquiry adds:

• the UL AWM Style 3271 requirement
• the AWG or kcmil size
• solid or stranded construction
• conductor material and plating, where controlled by the drawing
• strand construction and maximum conductor resistance, where controlled
• whether the optional semi-conductive layer is required, and whether extruded or non-extruded
• insulation colour and any identification requirement
• the marking requirement
• maximum OD and OD tolerance, where controlled
• the motor lead or appliance internal wiring location
• the drawing, BOM or equipment specification
• documentation requirements, quantity and packaging or reel preference
• the destination and the requested Incoterm

No price, currency, pricing formula or price validity period is published on this page. A quotation is prepared against a defined construction and commercial scope and issued as a separate quotation document.

What Style 3271 Does and Does Not Define

Style 3271 defines:

• 125°C temperature rating
• 600 Vac and 750 Vdc voltage ratings
• Horizontal Flame
• conductor range 30 AWG–2000 kcmil, solid or stranded
• an optional extruded or non-extruded semi-conductive polymeric layer over the conductor
• extruded XLPE insulation with size-dependent minimum wall requirements across six groups
• Marking: General
• Use: For use as Motor Leads or Internal Wiring of appliances.
• optional tag: 2500 volt peak – For Electronic Use Only

Style 3271 does not universally define:

• conductor material, plating, strand count, strand diameter or lay length
• a function or performance for the semi-conductive layer
• finished OD, OD tolerance, bend radius, flex cycles or flex class
• conductor resistance, ampacity, current rating or metric cross-section
• motor insulation class, inverter duty, VFD rating or partial-discharge performance
• oil, chemical or solvent resistance
• equipment system voltage ratings
• installation, field wiring or external cable suitability
• colour, reel length, MOQ, stock, lead time, production capacity or shipping term

Common Procurement Errors

• Writing “125°C continuous”, or claiming a higher temperature rating.
• Writing “600V AC/DC”, or converting 750 Vdc into an AC value.
• Presenting 750 Vdc as a drive bus or equipment system rating.
• Using 2500 volt peak as a working voltage, or dropping “For Electronic Use Only”.
• Treating the optional semi-conductive layer as standard, or assigning it stress-control, corona or inverter-duty performance.
• Quoting one insulation wall figure across the whole 30 AWG–2000 kcmil range.
• Omitting the minimum-at-any-point value from the applicable size group.
• Deriving a finished OD from the minimum wall values.
• Assuming the conductor is tinned copper, or claiming a stranding class or flexibility grade.
• Deriving ampacity from conductor size or the ratings.
• Treating the Style as a motor insulation class or an inverter-duty qualification.
• Extending the Use into VFD output cable, external motor supply cable or installation wiring.
• Describing the insulation as PVC, silicone or a fluoropolymer, or claiming oil and chemical resistance.

RFQ Information to Confirm

Style and ratings

• UL AWM Style 3271 requirement
• 125°C temperature rating requirement
• Required voltage requirement within the 600 Vac and 750 Vdc ratings
• AWG or kcmil size

Conductor and construction

• Solid or stranded construction
• Conductor material and plating requirement, if controlled by the drawing
• Strand construction, if controlled
• Maximum conductor resistance or controlled mm² cross-section, if applicable
• Whether the optional semi-conductive layer is required, extruded or non-extruded
• Maximum OD and OD tolerance, if controlled

Identification and application references

• Insulation colour and identification requirement
• Marking requirement
• Motor lead or appliance internal wiring location
• The circuit requirement for engineering review, rather than a self-derived ampacity
• Drawing, BOM or equipment specification

Commercial

• Quantity and packaging or reel preference
• Destination and requested Incoterm
• Requested UL marking and compliance documents, including any RoHS / REACH documentation requirement

UL Marking and Documentation

CableApex is an international sales and export company and does not hold a UL File for Style 3271. Supplied wire is UL-recognized component wire where supplied under a qualified manufacturing scope, with UL marking according to the confirmed ordered construction. The Style record lists Marking as General.

Applicable RoHS / REACH documentation can be confirmed according to the ordered construction. CSA, FT1, VW-1, CE and dual UL/CSA designations are not claimed here.

Commercial, origin, compliance and transport documents are identified during quotation and confirmed according to the order. They are not supplied as a fixed package with every shipment.

Related Categories

• UL 3271 XLPE Wire
• XLPE Wire
• AWM Wire