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| mm² | Max Amps (Chassis wiring) | Max Amps (Power transmission) | | :--- | :--- | :--- | | 1.5 mm² | 15A | 10A | | 2.5 mm² | 20A | 15A | | 4 mm² | 30A | 20A | | 6 mm² | 40A | 30A | | 10 mm² | 55A | 40A | | 16 mm² | 75A | 55A |

Choosing the wrong cable size isn't just an inconvenience—it’s a fire hazard. Undersized cables overheat, melt insulation, and can cause voltage drops that damage your equipment. calculate cable size

Disclaimer: This guide is for educational purposes. Electrical work can be dangerous and fatal if done incorrectly. Always comply with local codes and regulations, and hire a qualified electrician for permanent installations.

Will the cable be buried, in a conduit, or clipped to a wall? High ambient temperatures or bunching cables together reduces their current-carrying capacity. 2. The Calculation Process Step A: Determine the Design Current ( Ibcap I sub b Got a specific project in mind

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Always size your cables based on the maximum current of the circuit and the length of the run to account for voltage drop. Undersizing a cable can lead to overheating and fire hazards. If you are unsure, consult a licensed electrician. Undersized cables overheat, melt insulation, and can cause

When in doubt, go bigger. But don't guess—calculate.

Select a circuit breaker or fuse that is equal to or slightly higher than your design current ( ). Common sizes are 6A, 10A, 16A, 20A, 32A, etc. Step C: Apply Correction Factors

If your 5A fridge runs through a hot attic (0.87) and is bundled with 4 other cables (0.80): ( 5 / (0.87 \times 0.80) = 5 / 0.696 = 7.2A )

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