UL 3321 150°C XLPE Wire for Saudi Data Centres and UAE — Including 4/0 AWG
UL 3321 XLPE wire is rated 150°C and 600V AC under UL AWM Style 3321 — the highest-temperature grade in the standard XLPE AWM wire range, sitting above UL 3266 (125°C) and UL 3271 (90°C). The 150°C rating is achieved through a higher cross-link density in the polyethylene compound, giving UL 3321 the additional thermal headroom required for wiring in environments where the combination of high ambient temperature, high current density, and poor ventilation pushes conductor operating temperatures beyond the limits of 90°C or 125°C rated wire.
In Saudi Arabia’s data centre sector — the fastest-growing in the Middle East under Vision 2030 — the electrical rooms housing generator sets, UPS systems, and main distribution switchboards regularly experience ambient temperatures of 40–55°C in summer even in ostensibly air-conditioned spaces, due to the heat load from the electrical equipment itself. Large cross-section cables (including 4/0 AWG, which carries 200A in free air at 150°C) running between generator terminals, ATS panels, and UPS input busbars are the critical power paths in these rooms, and specifying 150°C rated XLPE wire provides the thermal margin to ensure reliable long-term performance even under Saudi summer ambient conditions. UAE data centres and electrical equipment manufacturers in Dubai source 4/0 AWG UL 3321 for the same large-conductor internal wiring applications.
Product Specifications — UL 3321
| Parameter | Specification |
|---|---|
| UL AWM style | 3321 |
| Insulation material | Cross-linked polyethylene (XLPE, high cross-link density) |
| Temperature rating | 150°C continuous |
| Voltage rating | 600V AC |
| Conductor | Solid or stranded copper (tinned or bare) |
| AWG / size range | 30 AWG – 4/0 AWG |
| Min avg insulation thickness (30–10 AWG) | 30 mils (0.76 mm) |
| Min avg insulation thickness (8–2 AWG) | 45 mils (1.14 mm) |
| Min avg insulation thickness (1–4/0 AWG) | 60 mils (1.52 mm) |
| Flame rating | Horizontal flame, VW-1 |
| UL file number | E333030 |
| Colour options | Red, black, white, yellow, blue, green, brown, grey, custom |
| Compliance | RoHS, REACH |
Reprinted from Product iQ with permission from UL Solutions. ©2026 UL LLC. File No. E333030, last updated 2025-12-01.
XLPE Wire Temperature Grade Comparison
| Property | UL 3321 (this product) | UL 3266 | UL 3271 |
|---|---|---|---|
| Temperature rating | 150°C | 125°C | 90°C |
| Voltage rating | 600V AC | 600V AC | 600V AC |
| AWG range | 30 AWG – 4/0 AWG | 30 AWG – 2000 kcmil | 30 AWG – 2000 kcmil |
| Best for Saudi/UAE data centres | Hot electrical rooms, generator feeds, UPS leads | Motor leads, outdoor motors | Standard LV motors, HVAC |
| Price relative | Highest (most cross-linked) | Medium | Most competitive |
Saudi Data Centre and UAE Applications
4/0 AWG — Saudi data centre generator and UPS feeds
4/0 AWG (107 mm², 200A capacity at 150°C) is one of the largest AWG sizes in the UL 3321 range and covers the internal power feed connections inside data centre electrical rooms between generator set output terminals and the automatic transfer switch (ATS), from the ATS to the UPS input busbars, and from the UPS output to the main distribution board (MDB). These connections are permanent fixed installations in electrical rooms that remain energised continuously for the life of the data centre — the wire must maintain full electrical and mechanical integrity across thousands of thermal cycles and decades of continuous service in the Saudi summer ambient environment.
UAE electrical equipment manufacturing (Dubai)
Power transformer manufacturers, high-power UPS OEMs, and large generator set assemblers in Dubai Industrial City and JAFZA use 4/0 AWG UL 3321 XLPE wire for the internal busbar-to-terminal connections in equipment rated for 200A+ continuous service in outdoor or hot-room installations across the GCC market. The 150°C temperature rating of UL 3321 versus the 90°C of UL 3271 allows these manufacturers to derate less aggressively for GCC ambient conditions, maintaining rated current capacity at a higher percentage of the 25°C free-air rating. See also: UL 3266 125°C XLPE wire for motor lead applications and UL 3271 90°C XLPE wire for standard LV motor connections.
Export supply to Saudi Arabia and UAE
Standard export package for both markets: Commercial Invoice, Packing List, Certificate of Origin (China Chamber of Commerce), Bill of Lading (CIF Jeddah / CIF Jebel Ali), Product Conformance Declaration referencing File No. E333030, RoHS Declaration, MSDS. Arab League CoO on request. Transit: Saudi Arabia 18–22 days; UAE 16–20 days.
4/0 AWG Reference Data
| Parameter | 4/0 AWG Specification |
|---|---|
| AWG size | 4/0 AWG (0000) |
| Nominal cross-section | 107.2 mm² |
| Max DC resistance at 20°C | 0.161 Ω/km |
| Current capacity (free air, 150°C) | ~200A |
| Min avg insulation thickness | 60 mils (1.52 mm) |
| Typical OD | ~22–24 mm (insulated) |
| Typical application | Generator feeds, UPS internal busbars, ATS connections |
Key Features
Product
- UL AWM Style 3321, 150°C, 600V AC
- File No. E333030 — UL Follow-Up Service
- Highest temperature XLPE AWM grade
- 30 AWG to 4/0 AWG — full range
- VW-1 and horizontal flame rated
- RoHS and REACH compliant
Supply for Saudi Arabia and UAE
- Factory-direct from Yangzhou, China
- CIF Jeddah (Saudi) / CIF Jebel Ali (UAE)
- Full UL and compliance documentation
- Arab League CoO available
- MOQ 500 m
- 10–15 working day lead time
Common Applications
Data centre generator and UPS internal connections (Saudi Arabia)
Internal power feed connections in Saudi Arabia data centre electrical rooms — generator output to ATS, ATS to UPS input busbars, UPS output to MDB — where 4/0 AWG UL 3321 provides 200A capacity with 150°C thermal rating for reliable long-term service in Riyadh summer ambient conditions.
High-power electrical equipment internal wiring (Dubai)
Internal busbar-to-terminal connections in power transformers, large UPS systems, and generator sets manufactured in Dubai for the GCC market — where 150°C XLPE provides adequate derating margin for GCC ambient conditions at rated current.
Industrial power distribution in hot environments
Internal wiring of motor control centres (MCCs), main distribution boards, and sub-distribution boards in Saudi and UAE industrial facilities where electrical room ambient temperature exceeds the comfort zone of 90°C or 125°C rated wire due to equipment heat load and inadequate ventilation.
Other applications
- Renewable energy inverter internal high-current connections
- Offshore platform electrical room internal wiring
- Hospital and critical facility UPS internal leads
- Airport electrical infrastructure internal power wiring
Ordering Information
Specify AWG (including 4/0 AWG for large conductor applications), conductor type (tinned or bare), colour, and quantity. MOQ 500 m. UL 3321 compliance documentation and RoHS Declaration supplied. Arab League CoO on request. Sample from 5 m for large AWG sizes.
Request CIF Jeddah or Jebel Ali pricing. Provide AWG, quantity, and destination port. We respond within 24 hours. Contact us.
Why CableApex for Saudi Data Centres and UAE
CableApex manufactures UL 3321 150°C XLPE wire under UL Follow-Up Service (File No. E333030) in Yangzhou. 100% online spark testing and continuous diameter monitoring across all AWG sizes including 4/0 AWG. Direct export to Saudi Arabia (18–22 days to Jeddah) and UAE (16–20 days to Jebel Ali). Complete UL documentation for Vision 2030 and UAE data centre procurement qualification. Contact us within 24 hours.
