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Find the right calculator for the questions our specialists field weekly — pipe sizing, storage capacity, electrical conversions and water-quality checks. Sensible defaults, every field editable, every output in the units you work in.

Cable size calculator

Select the smallest copper cable that meets both ampacity and voltage-drop limits per SANS 10142-1 / IEC 60364, with installation-method and ambient-temperature derating.

Voltage system

Load input

Power

kW

Power factor

PF

0.85 typical for VSD-driven motors · 1.00 for resistive loads.

Cable run length

m

One-way distance from supply to load.

Installation method

Each method has its own ampacity table — affects allowable current.

Ambient temperature

°C

PVC cable derates above 30 °C.

Max voltage drop

%

SANS 10142 allows ≤ 5 % from supply to point of use (3 % preferred for motor circuits).

Sizing margin

%

Extra capacity on top of design current for breaker and cable selection — typically 25 %.

Design current

25.5A

= 31.8 A with 25 % margin

Suggested breaker

32A

3-pole MCB / MCCB · 400 V system.

Minimum cable size

6mm² copper

= 2.55 % Vd over 50 m

Driven by ampacity, not voltage drop (voltage drop alone needs only 4 mm²).

Derated ampacity at chosen size

33.8A

After 100 % install × 94 % ambient.

Industry-standard calculators.
Real formulas. Real results.

Hydraulic

Water quality

Sizing & capacity

Irrigation

Pool & spa

Electrical

Solar

Cable size calculator

Brief us on your water needs.

Industry-standard calculators.Real formulas. Real results.

Hydraulic

Water quality

Sizing & capacity

Irrigation

Pool & spa

Electrical

Solar

Brief us on your water needs.

Industry-standard calculators.
Real formulas. Real results.