Calculation details
Calculated result
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A = 2 × ρ × I × L / allowed ΔV
Assumptions and limits
Uses a two-conductor loop and approximate reference resistivity: copper 0.0175 or aluminium 0.0282 Ω·mm²/m. Ignores temperature rise and AC reactance. Does not check ampacity, protection or three-phase voltage drop. Listed sizes are compared only on voltage drop, not current-carrying capacity.
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This tool is provided for general guidance only and must not be treated as professional, engineering, electrical, gas, HVAC, structural, construction, legal, or regulatory advice.
All results must be checked by a competent qualified person before use. Users must verify calculations against the laws, regulations in force, standards, codes of practice, manufacturer instructions, inspection requirements, site conditions, and safety duties that apply in their territory or jurisdiction.
Relevant bodies, regulators, schemes, or standards may include, depending on the work and location, organisations and frameworks such as the HSE, local authority building control, Gas Safe Register, NICEIC, NAPIT, IET Wiring Regulations / BS 7671, British Standards, ISO standards, IEC standards, Building Regulations, Water Regulations, CDM duties, and any other applicable authority, code, or standard in force.
Mention of any organisation, scheme, regulator, or standard does not imply approval, certification, endorsement, authorisation, sponsorship, approval, partnership, or verification of Morlich Co or its tools.
Morlich Co accepts no liability for personal injury, property damage, unsafe work, failed inspection, regulatory breach, business loss, equipment failure, incorrect specification, or reliance on tool outputs.
This tool is provided for general guidance only and must not be treated as professional, engineering, electrical, gas, HVAC, structural, construction, legal, or regulatory advice.
All results must be checked by a competent qualified person before use. Users must verify calculations against the laws, regulations in force, standards, codes of practice, manufacturer instructions, inspection requirements, site conditions, and safety duties that apply in their territory or jurisdiction.
Relevant bodies, regulators, schemes, or standards may include, depending on the work and location, organisations and frameworks such as the HSE, local authority building control, Gas Safe Register, NICEIC, NAPIT, IET Wiring Regulations / BS 7671, British Standards, ISO standards, IEC standards, Building Regulations, Water Regulations, CDM duties, and any other applicable authority, code, or standard in force.
Mention of any organisation, scheme, regulator, or standard does not imply approval, certification, endorsement, authorisation, sponsorship, approval, partnership, or verification of Morlich Co or its tools.
Morlich Co accepts no liability for personal injury, property damage, unsafe work, failed inspection, regulatory breach, business loss, equipment failure, incorrect specification, or reliance on tool outputs.