Electrical Engineering
Electrical Calculators
Tools for cable sizing, circuit breaker selection, and feeder voltage drop calculations per EIT and IEC standards.
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Select circuit breaker rating so that Ib ≤ In ≤ Iz, with branch-circuit, minimum-conductor, breaking-capacity, and MEA / PEA service-entrance checks per EIT 2001-56 Ch. 3.
breaker sizing
MCB
MCCB
Copper PVC / XLPE cable size from the Thai Electrical Code (EIT 2001-56 Ch. 5) ampacity tables, with ambient and grouping correction factors and a voltage drop check.
cable sizing
ampacity
EIT 2001-56
Single- and three-phase feeder voltage drop with conductor resistance at operating temperature, reactance, power factor, and minimum cable size per IEC 60364-5-52 Annex G.
voltage drop
feeder
three-phase