Calculator catalog
Choose a category or search by quantity, component or engineering topic.
Found 13 calculators
Cable ampacity after correction
Multiplies the manually provided base ampacity Iz by a correction factor.
Manual cable overload conditions check
Checks the provided Ib, In, Iz and I2 values without standards-table sizing.
Exact Iz lookup from user table
Looks up base ampacity Iz only for an exactly entered section in the user-supplied table.
Single-phase selection from user table
Selects the smallest entered section that meets the manual current conditions and voltage-drop limit.
Three-phase selection from user table
Selects the smallest entered section for a simplified balanced three-phase system.
Manual single-phase cable sizing check
Combines load current, manually corrected Iz, voltage drop and overload-condition checks.
Manual three-phase cable sizing check
Checks a balanced three-phase system with manually provided Iz, protective-device and voltage-drop data.
Manual WLZ check
Simplified manual WLZ check using installed power and demand factor.
Historical insulated-copper ampacity
Historical data from a 1938 publication. Exact Iz lookup for educational and comparative use only.
Historical minimum copper section
Historical data from a 1938 publication. Smallest-section selection without interpolation, for educational and comparative use only.
Historical underground three-core cable ampacity
Historical 1000 V cable data from a 1938 publication, for educational and comparative use only.
Manual Iz compared with historical value
Compares manually entered Iz with the historical insulated-copper value without PASS/FAIL judgement.
Cable and feeder sizing designer
Manual verification of a selected cable and feeder: Ib, corrected Iz, protective device, voltage drop and explicit margins without normative tables.