Screening use only — Results are educational estimates. They are not verified for construction, equipment selection, or permit submission.
These calculators are undergoing a correctness audit against primary standards. Part of the logic still rests on engineering rules-of-thumb rather than rules traced to a dated edition of a code, and some published citations do not yet match the rule the code actually applies. Known defects are being fixed in sequence.
Treat every number here as a starting estimate to be checked, never as a design decision. Anything that will be built, energised, or submitted to an authority must be independently calculated and sealed by a licensed engineer who takes responsibility for the result.
Audit status: in progress · Assurance level: screening · Not for permit use
Rule-of-thumb decisions on this calculator
H-008 · forbid permit
Decision points: built-in kW series used as the screening catalog candidate
Motor screening refuses missing efficiency, power factor, service factor, temperature and altitude derating and starting multipliers, and reports the service factor rather than folding it into the sizing. The only value the engine still chooses is the built-in kW candidate series, disclosed in the result as an unverified catalog list.
Permit gate: block