Wire Cross-Section & Maximum Current Capacity — Complete Egyptian Code Reference
The most common mistake in Egyptian electrical installations is not in the panel or breakers — it's in the wires themselves. A wire undersized for its load means continuous heating, insulation degradation, and in the worst case a fire inside the wall. This table is derived from IEC 60364 and IEC 60228 standards adopted in the Egyptian electrical code, adjusted with derating factors for Egypt's summer temperatures reaching 40–45°C.
Quick Answer
Complete reference table for copper wire cross-sections (1.5–35mm²) and maximum current capacity per Egyptian electrical code and IEC standard, with derating factors for Egypt's hot climate and a household appliance ampacity guide.
Copper Wire Ampacity Table — Egyptian Electrical Code
Installation method B — cables in PVC conduit inside walls (most common in Egypt) | Source: IEC 60364-5-52 adjusted with 40°C derating factor
| Cross-section (mm²) | IEC 30°C (A) | Egypt 40°C (A) | Recommended breaker (A) | Max load @220V (W) | Typical use |
|---|---|---|---|---|---|
| 1.5 | 16.5 | 14 | 10 | 2,200 | Lighting only — never for outlet circuits |
| 2.5 | 23 | 20 | 16 | 3,520 | General outlets — living rooms, bedrooms |
| 4 | 30 | 26 | 20 | 4,400 | AC 1.5–2 HP, large refrigerator |
| 6 | 38 | 33 | 25 | 5,500 | AC 2.5 HP, water heater 3 kW |
| 10 | 52 | 45 | 40 | 8,800 | Sub-panel, small central AC, full kitchen |
| 16 | 69 | 60 | 50 | 11,000 | Main feed for 80–120m² apartment |
| 25 | 90 | 78 | 63 | 13,860 | Main feed for 150–200m² apartment / small villa |
| 35 | 111 | 96 | 80 | 17,600 | Main feed for large villa / small building |
Thermal Derating Factors — Egypt's Climate
Multiply the wire capacity from the table above × derating factor to get the actual capacity under installation conditions.
Example: 2.5mm² at 30°C = 23A. In Egypt's summer (40°C) with 3 cables in one conduit: 23 × 0.61 = 14A — barely above the limit of a 1.5mm² wire. This means many 2.5mm² wires in Egypt are running above their actual capacity in summer.
Household Appliance Reference — Correct Wire & Breaker
| Appliance | Watts | Current | Wire | Breaker |
|---|---|---|---|---|
| LED lighting — one room (5–10 bulbs) | 50–150 | 0.2–0.7A | 1.5mm² | 10A |
| Standard refrigerator | 150–300 | 0.7–1.4A | 2.5mm² | 16A |
| Washing machine | 1,500–2,000 | 6.8–9.1A | 2.5mm² | 16A |
| AC 1 HP (0.75 kW) | 750–900 | 3.4–4.1A | 2.5mm² | 16A |
| AC 1.5 HP (1.1 kW) | 1,000–1,300 | 4.5–5.9A | 4mm² | 20A |
| AC 2 HP (1.5 kW) | 1,300–1,700 | 5.9–7.7A | 4mm² | 20A |
| AC 2.5 HP (1.85 kW) | 1,700–2,200 | 7.7–10A | 6mm² | 25A |
| Electric water heater 3 kW | 3,000 | 13.6A | 6mm² | 25A |
| Electric oven / cooker | 3,000–7,000 | 13.6–31.8A | 6–10mm² | 25–40A |
| Water pump 1.5 HP | 1,100 | 5A | 2.5mm² | 16A |
| Clothes iron | 2,000–2,500 | 9.1–11.4A | 2.5mm² | 16A |
| EV charger Level 2 | 7,200–11,000 | 32–50A | 10–16mm² | 40–50A |
Common Wire Sizing Mistakes — and Their Consequences
Using 1.5mm² for outlet circuits: many electricians run everything in 1.5mm² to cut costs. Egyptian 220V outlets carry up to 16A — but 1.5mm² is rated only 14A after climate derating. Plugging in an iron (2.5kW) on this circuit means sustained overloading.
Connecting AC to the general outlet circuit (2.5mm²): a 2 HP AC draws 7–8A for hours at a time. If the same circuit also carries an iron or laptop charger, the 16A breaker will either trip repeatedly — or worse, won't trip and the wire overheats.
Ignoring the thermal derating factor: IEC tables are calculated at 30°C ambient. Egypt's summer is 40–45°C. Without the derating correction, a wire calculated as 'sufficient' runs above its real rating throughout summer.
Using aluminium instead of copper at the same cross-section: aluminium carries only 60% of copper's current at the same size. If you see grey or gold-coloured wires in a building constructed before 1995, these are likely aluminium and need immediate assessment.
The safe rule: the breaker is always rated below the wire's capacity. For example: a 2.5mm² wire (20A after Egypt derating) is protected by a 16A breaker — the breaker trips before current reaches the wire's damage threshold. A common mistake is fitting a 20A breaker on a 2.5mm² wire.
FAQ
How do I calculate the required wire cross-section for a specific appliance?
Steps: (1) Calculate the device current: I = P ÷ V = Watts ÷ 220. (2) Multiply by 1.25 safety margin (80% loading). (3) Compare the result against the '40°C Egypt' column in the table and choose the next size up. Example: water heater 3kW = 3000÷220 = 13.6A × 1.25 = 17A → choose 6mm² (33A) protected by a 25A breaker.
What's the difference between wire capacity and the correct breaker rating?
Wire capacity is the maximum current before damage. The breaker must trip before reaching that limit. The rule: choose the next breaker rating below the wire's capacity. Example: 2.5mm² wire = 20A (Egypt) → 16A breaker. Never fit a 20A breaker on a 2.5mm² wire.
Can one wire feed more than one large appliance?
The rule: every large load (AC unit, water heater, oven) requires a dedicated circuit from the panel. The cumulative draw of multiple appliances on one circuit means sustained overloading that degrades the wire over time. General outlet circuits can be shared — but even then a maximum of 4–6 outlets per circuit.
What is the mandatory wire specification in Egypt?
The Egyptian electrical code requires PVC-insulated copper conductors meeting IEC 60227 or its Egyptian equivalent. El-Sewedy's official specification ES 376 is certified by the Egyptian Organization for Standardization. Aluminium conductors are not used in new installations since 2000.
How do I tell if the wires in my old building are aluminium?
Signs of aluminium wiring: (1) The conductor is grey or silver instead of copper-red. (2) The building was constructed between 1970–1995. (3) The breakers are old ceramic cartridge type. Aluminium wiring is not officially banned but needs inspection — particularly at connection points where oxidation causes heating.
What's the difference between a certified El-Sewedy 2.5mm² cable and an unbranded one?
A certified cable guarantees the actual conductor cross-section is truly 2.5mm². Unbranded cables from El-Ataba market frequently have actual cross-sections of 1.8–2.2mm² sold in packaging labelled 2.5. Request the test certificate or check the El-Sewedy batch number printed on the cable jacket via their website.