Cabling & Wiring

Cable Standards

All cables used on UAE construction sites must comply with IEC 60227 (PVC-insulated cables) or IEC 60245 (rubber-insulated cables) for flexible cables, and IEC 60502 for power cables. The Abu Dhabi DoE EWR 2020 and Dubai Building Code 2021 both require cables to be selected and installed in accordance with IEC 60364-5-52. Cables passing on or over walkways must comply with BS 4363 requirements.

• Fixed wiring standard

  IEC 60502 (power cables) / IEC 60227 (PVC insulated)

  critical

• Flexible cables

  IEC 60245 (rubber) — H07RN-F type for outdoor/site use

  critical

• Cables over walkways

  BS 4363 requirements — overhead at ≥5.2 m or protected conduit

  critical

• Flexible cables in Abu Dhabi

  Not permitted for internal fixed wiring (ADDC checklist)

  critical

Cable Derating — UAE Climate

Cable current-carrying capacity must be derated for UAE ambient conditions. The standard IEC 60364-5-52 derating tables are based on 30°C ambient. In the UAE, outdoor ambient temperatures regularly exceed 45–50°C in summer, and cable surface temperatures on rooftops or in direct sunlight can exceed 70°C. Cables must be derated accordingly — this typically reduces the current-carrying capacity by 25–40% compared to standard tables.

• Design ambient temperature

  Minimum 45°C for outdoor/exposed UAE locations

  critical

• Direct sunlight derating

  Apply additional 0.9 derating factor for cables in direct sun

  critical

• Grouping derating

  Apply IEC 60364-5-52 Table B.52.17 for grouped cables

  critical

• Buried cables

  Ground temperature 25°C assumed — verify for UAE desert conditions

  standard

Undersized cables in the UAE heat are a leading cause of cable fires on construction sites. Always apply UAE-specific derating factors, not standard European tables.

Cable Routing and Protection

Cables on UAE construction sites must be routed to minimise mechanical damage, trip hazards, and exposure to heat, chemicals, and UV radiation. All cables crossing vehicle routes must be protected in heavy-duty conduit or cable ramps. Cables must not be run through water, oil, or chemicals.

• Vehicle crossing protection

  Heavy-duty conduit or cable ramp — rated for vehicle loads

  critical

• Overhead cables

  Minimum 5.2 m above ground for vehicle routes

  critical

• Pedestrian routes

  Minimum 2.5 m overhead or protected cable ramp at ground level

  critical

• UV protection

  UV-resistant sheathing or conduit for all outdoor cables

  critical

• Cable joints

  Weatherproof joints only — no insulation tape joints outdoors

  critical

• Trailing cables

  Inspected daily — no cuts, abrasions, or exposed conductors

  critical

Colour Coding

The UAE follows IEC 60446 colour coding for conductors. Brown = Line 1 (L1), Black = Line 2 (L2), Grey = Line 3 (L3), Blue = Neutral (N), Green/Yellow = Protective Earth (PE). Old British colour coding (Red/Yellow/Blue/Black/Green) must not be used in new installations.

Mixing old and new colour coding on the same site is a serious safety hazard. All cables must be clearly labelled at termination points. Any old-colour-coded cables found on site must be clearly labelled "OLD COLOURS — SEE CIRCUIT SCHEDULE".