MEDIUM VOLTAGE · 12.7 / 22 kV · IEC 60502-2
Кабель XLPE 22 кВ
Middle East & North Africa utility primary distribution and heavy industry intake. Three-core or single-core construction, copper or aluminium conductor, manufactured against IEC 60502-2 with project-specific screen sizing, armour and sheath.
§01 — Cable construction
The reference construction, layer by layer.
12.7/22 kV is the BS 6622 designation for the 24 kV class used across UK-influenced utility networks. The construction matches the IEC 12/20 build — 5.5 mm XLPE, screened cores, STA or SWA armour — with marking, drum cards and test records formatted for utility acceptance checks.
| # | Слой | Reference detail |
|---|---|---|
| 01 | Жила | Cu class 2 stranded (RM). Sector-shaped (SM) for 3-core ≥ 185 mm². |
| 02 | Conductor screen | Extruded semiconducting compound, ≤ 0.5 mm nominal thickness. |
| 03 | Изоляция XLPE | Extruded XLPE, 5.5 mm nominal — the same wall as the IEC 12/20 (24 kV) class — per BS 6622 practice for 12.7/22 kV. |
| 04 | Insulation screen | Extruded semiconducting, strippable or bonded per requirement. |
| 05 | Metallic screen | Cu wire screen sized per BS 6622 / IEC practice for the 24 kV class; cross-section confirmed against the utility earth-fault data. |
| 06 | Inner sheath | PVC ST2, extruded bedding. |
| 07 | Броня | Double steel tape (STA) for direct burial; SWA for higher tensile load; AWA for single-core. |
| 08 | Serving | Anti-corrosion wrap on certain designs (optional). |
| 09 | Outer sheath | PVC ST2 black; PE or LSZH on request. |
§02 — Technical specifications
Electrical parameters — 12.7 / 22 kV class.
| Conductor (mm² Cu) | Insulation thickness | DC resistance @20 °C (Ω/km) | Indicative current, direct burial 25 °C (A) |
|---|---|---|---|
| 3 × 35 | 5.5 mm | 0.524 | ~170 |
| 3 × 50 | 5.5 mm | 0.387 | ~205 |
| 3 × 70 | 5.5 mm | 0.268 | ~250 |
| 3 × 95 | 5.5 mm | 0.193 | ~300 |
| 3 × 120 | 5.5 mm | 0.153 | ~345 |
| 3 × 150 | 5.5 mm | 0.124 | ~385 |
| 3 × 185 | 5.5 mm | 0.0991 | ~435 |
| 3 × 240 | 5.5 mm | 0.0754 | ~500 |
| 3 × 300 | 5.5 mm | 0.0601 | ~560 |
| 3 × 400 | 5.5 mm | 0.0470 | ~640 |
DC resistance values per IEC 60228. Indicative current: ground 25 °C, soil thermal resistivity 1.5 K·m/W, depth 1.0 m, flat formation — reference only; final ampacity is calculated against your installation conditions. Overall diameter and weight for this voltage class are issued in the project datasheet with the formal offer.
§02B — Worked example · 12.7 / 22 kV
Ring-main feeder check at 22 kV.
A 3 × 185 mm² Cu ring-main section, 3 km, 200 A, cos φ 0.85: R = 0.0991 Ω/km, reactance ≈ 0.09 Ω/km, so ΔU ≈ √3 · I · L · (R cos φ + X sin φ) ≈ 135 V — about 0.6% of 22 kV, leaving ample margin for the rest of the ring. Sector-shaped cores keep the drum diameter manageable at this size; the value is re-checked against your actual route before the offer is issued.
§03 — Standards
Standards printed on the sheath and on the drum card.
§04 — Applications
Where 22 kV cable from Lulian is in service.
22 kV primary distribution
Three-core armoured feeders for GCC and North African utility networks, designed for high soil temperature derating.
Primary distribution in hot climates →Plant primary supply
22 kV intake to oil & gas and desalination facilities; PE sheath option for high ambient and buried routes.
Oil, gas and desalination plants →Airport & port distribution
22 kV rings inside large infrastructure sites with distributed substations.
Airport, port and infrastructure cable →Not sure which voltage class your network needs? See all cable applications and sector solutions, or send the system voltage and the earthing method — we confirm the class and the construction in the offer.
§05 — Quality testing
What we test on every drum.
Routine tests run on every drum; sample tests on each batch; type tests on new constructions witnessed by CNAS-accredited third-party labs.
- Conductor DC resistance at 20 °C (routine)
- AC voltage withstand AC 44.5 kV / 5 min (routine)
- Partial discharge ≤ 10 pC at 22 kV (1.73 U₀) (sample)
- Insulation thickness & eccentricity (sample)
- Metallic screen cross-section (routine)
- Armour coverage & bedding integrity (routine)
- Sheath thickness + spark test (routine)
- Bending test + voltage after bending (type)
- Impulse voltage 125 kV (type)
§06 — Packaging & delivery
Drums sized for the cable, not for the workshop.
BS 6622 orders are marked with the 12.7/22 kV designation and drum metering formatted for utility acceptance checks at the site gate. Wooden drums with fumigation marks for export; steel-plywood drums for heavy cross-sections. Cable ends sealed with heat-shrink caps; shipping marks per the buyer’s format.
Standard drum lengths: 500 / 1000 / 1500 / 2000 m. Lead time: 25–35 working days for stocked constructions; 40–55 working days for project-specific builds.
§07 — FAQ
Common questions on 22 kV cable procurement.
What is the U₀/U rating of 22 kV XLPE cable?
12.7 / 22 kV, Uₘ = 24 kV per BS 6622. The figures are phase-to-earth 12.7 kV and phase-to-phase 22 kV; the insulation wall matches the IEC 12/20 (24 kV) class, so performance and test data carry over.
What conductor cross-sections are available?
Three-core: 25–400 mm². Single-core: 25–630 mm². Copper or aluminium, class 2 stranded; sector-shaped conductors for large 3-core sizes.
Can the cable be direct-buried?
Yes. The armoured construction (STA) with PVC ST2 outer sheath is rated for direct burial. SWA is recommended where tensile load or rodent risk is high.
What is the partial discharge limit?
≤ 10 pC measured at 22 kV (1.73 U₀) per IEC 60502-2. PD is measured on every drum and documented on the routine test report.
What routine and type tests are performed?
Routine on every drum: conductor DC resistance, AC voltage withstand AC 44.5 kV / 5 min, sheath spark test. Sample: PD, insulation thickness, screen check. Type: bending + voltage, load cycle, impulse voltage 125 kV.
Can the cable be supplied with LSZH sheath?
Yes, for tunnel, metro, data centre and indoor substation use. Verified against IEC 61034 (smoke density) and IEC 60754 (acid gas).
What does 12.7/22 kV mean on the drum card?
It is the BS 6622 rating designation: 12.7 kV phase-to-earth, 22 kV phase-to-phase, 24 kV maximum system voltage. Utility inspectors use it to check the drum against the approved drawing — our drum cards print it together with the routine test values.
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Share voltage class, conductor material & size, core count, armour, sheath, installation method, total length and drum preference.
Запрос по email → sales@luliancable.comОткрыть форму запроса
§08 — Related
Other voltage classes & adjacent products.
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