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Industrial Tools / Calculators
Helsel-Jepperson offers five free online calculators for electrical contractors, OEMs, and maintenance teams. The Motor Circuit Selector sizes fuses, starters, and conductors for motor branch circuits per NEC 430.52, while the Wire & Conduit Tools handle wire sizing, ampacity, conduit fill, and voltage drop. The Wiring Device Selector maps NEMA plug and receptacle configurations, the Fuse Tools provide fuse sizing plus a Bussmann, Mersen, Littelfuse, and Edison cross-reference, and the Burndy Connector Calculator returns compression lugs, splices, and crimp die color codes for copper and aluminum conductors.
Motor Circuit Selector
Size fuses, starters, heaters, wire, and conduit for single- and three-phase motor branch circuits per NEC 430.52.
Wire & Conduit Tools
Wire size finder, NEC 310.16 ampacity, conduit fill, and voltage drop calculators for copper and aluminum conductors.
Wiring Device Selector
Interactive NEMA configuration chart for twist-lock and straight-blade plugs, receptacles, and connectors.
Fuse Tools
Motor circuit fuse sizing and a Bussmann, Mersen, Littelfuse, and Edison cross-reference chart.
Burndy Connector Calculator
Copper and aluminum compression lugs, splices, pin connectors, and crimp die color codes by conductor size.
