{"uid":"cap_QABKwpQLVbkruIOhQmq3q","slug":"electrical-calculators-voltage-drop-df0fae63","name":"Electrical Calculators – Voltage Drop","description":"Voltage drop of a copper or aluminium conductor, single or three phase, by mm2 or AWG, length, current and temperature.","url":"https://electrical-calc.x402tookit.com/voltage-drop?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["material","currentA","lengthM"],"properties":{"awg":{"type":"string","description":"American wire gauge such as 12 or 4/0 (send this or sizeMm2)"},"phase":{"type":"string","description":"single (default; there-and-back path) or three (balanced)"},"lengthM":{"type":"number","description":"One-way cable length in metres (source to load)"},"sizeMm2":{"type":"number","description":"Conductor cross-section in mm2 (send this or awg)"},"currentA":{"type":"number","description":"Load current in amperes (RMS)"},"limitPct":{"type":"number","description":"Drop limit in percent for the maximum length (default 3, a common guideline not a code rule)"},"material":{"type":"string","description":"copper or aluminium"},"powerFactor":{"type":"number","description":"Load power factor 0 to 1 (default 1)"},"temperatureC":{"type":"number","description":"Conductor temperature in degrees C (default 20)"},"supplyVoltageV":{"type":"number","description":"Line voltage in volts, to get percent drop (single: line-to-neutral or line-to-line supply as used)"},"reactanceOhmPerKm":{"type":"number","description":"Conductor reactance in ohm per km (default 0, resistance 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voltage drop across a copper or aluminium conductor for single or three-phase systems, given conductor size (mm² or AWG), length, current, and temperature.","exampleAgentPrompt":"Calculate the voltage drop for a 50-metre copper cable sized at 6 mm², carrying 25 amps on a single-phase 230V supply at 20°C, and tell me if it stays within the 3% limit.","exampleUseCases":[{"title":"Residential wiring compliance check","prompt":"I'm running a 30-metre copper 2.5 mm² cable from my consumer unit to a 16A socket on a single-phase 230V circuit at 20°C — what's the voltage drop in volts and percent, and does it pass the 3% limit?"},{"title":"Industrial three-phase cable run sizing","prompt":"For a balanced three-phase 400V motor drawing 60 amps, with a 120-metre aluminium cable at 4/0 AWG and a power factor of 0.9 at 75°C conductor temperature, what's the voltage drop and is it within 3%?"},{"title":"Solar PV DC cable loss estimate","prompt":"What voltage drop will I get on a 25-metre copper 10 mm² cable carrying 40 amps on a single-phase system at 35°C conductor temperature, and what's the maximum length I can use before exceeding a 2% drop?"}],"resultDescription":"Returns a structured object including the calculated voltage drop in volts and as a percentage of supply voltage, the maximum allowable cable length for the configured drop limit, a pass/fail verdict, summary text, the effective conductor area, phase type, current, and any advisory reasons or degraded-mode flags.","failureModes":["Missing required parameters (material, currentA, lengthM) returns a validation error","Supplying neither awg nor sizeMm2 causes an error since one conductor size parameter is required","Invalid material value (not 'copper' or 'aluminium') returns a rejection","Negative or zero current or length values produce an error","Out-of-range AWG strings that are not recognised return a parse error","Omitting supplyVoltageV means percentage drop cannot be computed and may be null"],"whenToPreferThis":"Choose this endpoint when you need a fast, on-demand voltage drop calculation for copper or aluminium conductors in single or three-phase AC circuits, especially when conductor size is specified in either mm² or AWG and the result must include a pass/fail verdict against a configurable percentage limit. It is well-suited for automated cable compliance checks, electrical design assistants, and field estimation tools. Prefer it over general physics calculators when you need electrical-specific defaults (20°C reference, 3% guideline) and structured verdict output.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-11-02T18:32:55.610Z","isFirstParty":false,"canonicalSlug":"electrical-calculators-voltage-drop-df0fae63"}