UL 3321 in 4/0 AWG for Saudi Arabia and UAE Sourcing
UL AWM Style 3321 is a single conductor with extruded XLPE insulation, rated 150°C with voltage ratings of 600 Vac and 750 Vdc, and a Horizontal Flame designation. The Style conductor range is 30 AWG through 4/0 AWG, solid or stranded, with an optional treated or untreated braid.
This page is positioned around one conductor size: 4/0 AWG. That size sits at the upper end of the Style range and belongs to the 1–4/0 AWG insulation group, which carries 80 mils minimum average with 72 mils minimum at any point.
The commercial context is B2B sourcing into Saudi Arabia and the UAE. Those are markets rather than applications — the destination does not change the Style, the ratings or the Use.
The official Use is internal wiring of appliances, and every application statement on this page stays inside it.
Verified UL Style 3321 Specification
| Parameter | Style-level information |
|---|---|
| UL AWM Style | 3321 |
| Product description | Single conductor with extruded insulation |
| Page-specific size | 4/0 AWG |
| Temperature rating | 150°C |
| Voltage ratings | 600 Vac / 750 Vdc |
| Flame | Horizontal Flame |
| Style conductor range | 30 AWG–4/0 AWG |
| Conductor form | Solid or Stranded |
| Insulation | Extruded XLPE |
| 30–9 AWG insulation | 30 mil minimum average / 27 mil minimum at any point |
| 8–4 AWG insulation | 45 mil minimum average / 40 mil minimum at any point |
| 3–2 AWG insulation | 60 mil minimum average / 54 mil minimum at any point |
| 1–4/0 AWG insulation | 80 mil minimum average / 72 mil minimum at any point |
| Covering | Optional treated or untreated braid |
| Marking | General |
| Official Use | Internal wiring of appliances |
Five points belong with that table. 4/0 AWG is this page’s specific procurement size. It falls in the 1–4/0 AWG insulation group, so 80/72 mil is the correct requirement for it. The full Style range describes construction scope and is not an inventory statement. Saudi Arabia and the UAE are sourcing markets, not separate UL applications. And the legacy text in this page’s URL is historical only — it does not define the product’s permitted Use.
4/0 AWG Belongs to the 1–4/0 AWG Group
This is the single most consequential detail on the page, because the adjacent group is easy to apply by mistake.
The Style insulation table runs 30–9 AWG, then 8–4 AWG, then 3–2 AWG, then 1–4/0 AWG. The final group carries 80 mils minimum average with 72 mils minimum at any point. That is the requirement that applies to 4/0 AWG.
The 60 mil minimum average / 54 mil minimum-at-any-point figures belong to the 3–2 AWG group. Applying them to 4/0 AWG understates the requirement by a full group, and a construction built to those figures is not a 4/0 AWG Style 3321 construction. The two groups are not mixed here.
80 and 72 Mils Are Minimum Requirements
The two figures are separate requirements. The first governs the average across the wall; the second sets a floor at every individual point on it.
Neither is a nominal value. The requirement is not an 80 mil nominal wall, not an exact 80 mil wall, and not a metric equivalent presented as though the Style supplies one dimension. A compliant construction satisfies both minimums without producing a single fixed figure — which is also why no finished outside diameter follows from them.
4/0 AWG Is the Top of the Style Range
Style 3321 covers 30 AWG through 4/0 AWG. 4/0 AWG is the upper limit, and the Style is not extended here beyond it into kcmil sizes.
The range describes the UL construction scope the Style permits. It does not prove inventory, a standard production range, a minimum order quantity, a lead time or immediate availability, and no statement to that effect appears here. Commercial availability of any particular size and construction combination is confirmed at quotation stage.
A Large Conductor Size Does Not Change the Use
This deserves its own section, because conductor size is the most common route to an out-of-scope application claim.
4/0 AWG is a substantial conductor. That does not convert an AWM component wire into building feeder cable, facility feeder cable, generator feeder cable, uninterruptible-power-supply feeder cable or distribution cable. Application is not inferred from conductor size.
A 4/0 AWG Style 3321 construction remains subject to the official Use: internal wiring of appliances. The same applies to the voltage ratings — 600 Vac and 750 Vdc describe the wire, and neither authorises unrestricted power distribution or expands the Use.
The Style is therefore not repositioned here as building wiring, field wiring, branch-circuit wiring, tray wiring, conduit wiring, switchboard wiring, distribution-board wiring, facility infrastructure wiring or external equipment cable.
Appliance Internal Wiring Contexts
The commercial contexts this page addresses are appliance internal power leads, internal component-to-component wiring, large-conductor appliance internal connections where the appliance design specifically requires 4/0 AWG Style 3321, and OEM appliance internal wiring specified by drawing or bill of materials.
UL does not separately approve any appliance type through this Style, and no such approval is implied by naming a context. The customer’s equipment specification remains controlling throughout.
600 Vac and 750 Vdc
Style 3321 carries two verified voltage ratings, and both belong in a complete technical statement of the Style.
They describe different conditions and are kept distinct here. Neither is written as 600/750 Vac, 750 Vac, 600 Vdc or 600V AC/DC. Where an appliance section operates on DC, the DC figure is the relevant one; where it operates on AC, the AC figure is. The enquiry should state which condition applies at the lead position.
The 150°C Rating
The verified temperature rating is 150°C. It is stated here without a continuity qualifier — not 150°C continuous, not continuous-duty, not long-term 150°C service — because the Style record states 150°C and nothing further.
No service-life statement is derived from it. Style 3321 provides no universal service life, thermal-cycle count, calendar life or aging guarantee, and none is invented here.
No thermal-margin arithmetic appears either. Subtracting a room ambient temperature from a Style rating and presenting the difference as usable design margin is not something the Style record supports, and no derating conclusion is drawn from the rating in either direction. Ambient conditions at the installed position are an equipment design matter evaluated against the appliance specification.
Optional Treated or Untreated Braid
Style 3321 permits an optional treated or untreated braid. Optional is the operative word: constructions exist both with and without it, and it is not a feature of every Style 3321 wire.
The braid material is not specified at Style level and is not invented here. No performance is attributed to it either — abrasion protection, thermal protection, mechanical reinforcement and flame performance are not established by the Style record.
Where a braid is required, state yes or no in the enquiry along with the applicable qualified construction. On a 4/0 AWG page this also matters dimensionally, since an optional outer layer changes the finished construction envelope.
Conductor Material and Stranding Are RFQ Fields
The Style-level conductor statement establishes the size range and the solid or stranded form. It establishes nothing else about the conductor.
Bare copper, tinned copper, silver-plated copper, nickel-plated copper and aluminium are none of them universally established by the Style, and no strand count, strand diameter, lay length or conductor diameter is stated here. Conductor material and plating are treated as RFQ confirmation fields.
Detailed stranding matters particularly at this conductor size, because large-conductor constructions vary considerably and termination hardware is frequently sensitive to it. Where the drawing controls stranding, it belongs in the enquiry.
No Universal Resistance, Ampacity or Power Rating
No conductor resistance value is published. Style 3321 provides no universal 4/0 AWG resistance figure, and no value is substituted from generic AWG tables, code tables or calculators. Detailed conductor construction is not fixed by the Style, which is precisely why one universal resistance cannot exist.
No current rating is published either. Product iQ provides no free-air ampacity, continuous current or equipment current rating for this Style, and none is calculated here or copied from a generic table. Actual current capability depends on the complete appliance design — the conductor construction, the installation, the ambient temperature, bundling, the equipment thermal design and the applicable engineering rules.
The same applies to system ratings. No generator, uninterruptible-power-supply, transformer, motor or switchgear rating is associated with 4/0 AWG here, and no kW, kVA, ampere or MVA selection guidance appears. This page is not a facility-power engineering guide.
Conductor Cross-Section and Finished OD
Generic AWG-to-metric conversion data is not presented here as a verified product parameter. The page states 4/0 AWG. Where a metric conductor cross-section is commercially required, the actual qualified conductor construction should be confirmed rather than a generic conversion assumed.
Finished outside diameter is treated the same way. Style 3321 defines no universal 4/0 AWG finished OD, and none is calculated here from a generic conductor diameter plus the minimum insulation wall. Actual OD depends on the conductor construction, the actual conductor diameter, the XLPE extrusion, whether the optional braid is included, and manufacturing tolerance.
For dimension-controlled projects, the buyer should supply the maximum OD, the OD tolerance, the routing clearance and the terminal-entry requirement.
Extruded XLPE
The verified insulation is extruded XLPE, also written as cross-linked polyethylene.
No compound-specific performance is attributed to it, and this page is not a comparison against other insulation families or other AWM Styles. Where another Style is under consideration, selection is made on the buyer’s required Style, temperature rating, voltage rating, Use, construction and approved equipment specification — not on a temperature hierarchy.
Horizontal Flame
The verified Style designation is Horizontal Flame. VW-1, FT1 and vertical flame are not claimed here, and Horizontal Flame is not converted into any of them. Any additional flame requirement depends on separate confirmation for the ordered construction.
Saudi Arabia and UAE Sourcing
This page addresses Saudi appliance OEM sourcing, UAE appliance-component procurement, and B2B buyers in both markets requesting Style 3321 in 4/0 AWG for export quotation against a qualified construction.
Geographic wording here is commercial sourcing context. No local project approvals, named end users, established local customer usage, government procurement approval or regional qualification programme is claimed, and regional climate is not used as technical justification for selecting one AWM Style over another. The buyer’s approved appliance specification determines the Style.
What the destination does affect is the commercial side of the enquiry: the port, the city, the Incoterm, the packaging and the documentation set requested by regional procurement teams. Those appear below as buyer-supplied fields rather than as published terms.
Commercial Terms Are Confirmed per Enquiry
No minimum order quantity, sample quantity, stock position, lead time, transit time, production capacity, quotation response time, fixed Incoterm, fixed port or certificate availability is published here. None of those is a Style 3321 parameter.
For commercial confirmation, buyers should provide the quantity, the destination country and city or port, the requested Incoterm, the packaging requirement and the documentation requirements. Insulation colour is treated the same way — no fixed colour list is presented as automatically available, and the required colour is confirmed for the ordered construction.
Bulk Wire and Processed Leads
This page primarily represents UL AWM Style 3321 single-conductor wire.
Nothing here implies that supply automatically includes cutting, stripping, crimping, terminals, connectors or finished harnesses. Where processed leads are required, those requirements are separately specified and confirmed, and stating which is needed in the first enquiry avoids quoting the wrong scope.
What Style 3321 Does and Does Not Define
The Style does define: solid or stranded conductor form; the 30 AWG–4/0 AWG range; 150°C; 600 Vac; 750 Vdc; Horizontal Flame; extruded XLPE; size-dependent insulation walls; an optional treated or untreated braid; and the Use — internal wiring of appliances.
The Style does not define:
- Conductor material and conductor plating
- Strand count, strand diameter and lay length
- Conductor resistance
- Finished OD and OD tolerance
- Ampacity, current rating and power rating
- Generator, UPS or other system ratings
- Bend radius and flex-cycle life
- Terminal compatibility
- Wire colour and cut length
- MOQ, stock, lead time, production capacity and shipping term
Each of those requires the customer specification, verified SKU documentation, the applicable qualified construction, or commercial confirmation.
Common Procurement Errors
- Assuming 4/0 AWG uses the 60/54 mil group. That group is 3–2 AWG.
- Specifying a 60 mil wall for 4/0 AWG. The requirement is 80 mil minimum average.
- Omitting the 750 Vdc rating. The Style carries two voltage ratings.
- Treating 600 Vac as the only Style voltage rating.
- Calling 150°C a continuous-service-life guarantee.
- Assuming every Style 3321 conductor is tinned copper. Conductor material is not set at Style level.
- Using a generic AWG resistance value as the product resistance.
- Assuming 4/0 AWG is universally a 200A wire. The Style provides no ampacity.
- Calculating finished OD from generic AWG data.
- Treating a large AWG size as permission for building or facility feeder wiring.
- Claiming VW-1 when only Horizontal Flame is verified.
- Treating the optional braid as mandatory.
- Assuming the full Style range is stocked.
- Using regional climate as the reason a particular AWM Style is required.
4/0 AWG RFQ Checklist — Saudi Arabia and UAE
- UL AWM Style 3321 requirement
- 4/0 AWG requirement
- Solid or stranded conductor
- Required conductor material
- Required conductor plating or finish
- Detailed strand construction, if controlled
- 150°C requirement
- 600 Vac and/or 750 Vdc requirement according to the approved specification
- Whether the optional braid is required
- If braid is required, the applicable qualified construction
- Appliance type
- Exact internal wiring location
- Customer drawing
- Approved bill of materials or existing wire specification
- Maximum finished OD, if controlled
- OD tolerance
- Routing clearance
- Terminal or connector interface
- Insulation colour
- Bulk wire or processed lead requirement
- Quantity
- Packaging
- Destination: Saudi Arabia or UAE
- Destination city or port
- Requested Incoterm
- Required compliance documentation
None of these values is invented here, and no requested configuration is presented as automatically available.
UL Marking and Documentation
Material is supplied as UL-recognized component wire where supplied under qualified manufacturing scope, and UL marking is applied according to the confirmed ordered construction. The Style-level marking designation is General.
CSA AWM, FT1, VW-1 and dual UL / CSA certification are not claimed here; any additional certification depends on the ordered construction. Applicable RoHS / REACH documentation can be confirmed according to the ordered construction.
