Calculate Cable Size Instant

[ \textMin. Cross Section (mm²) = \frac2 \times \rho \times I \times LV_d ]

You need at least 7.3 mm² . The nearest standard size is 10 mm² (since 6 mm² would be too small). Step 4: Adjust for Temperature and Grouping The formula above assumes ideal conditions. If cables run through hot attics or are bundled together, use these derating factors (from NEC/CEC tables): calculate cable size

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 ) [ \textMin

Step 3: Apply the Voltage Drop Formula The basic DC / single-phase AC formula is: Step 4: Adjust for Temperature and Grouping The

But don't worry. Calculating the correct cable size is straightforward once you understand the four key factors: