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Industrial Tools / Calculators
Helsel-Jepperson offers four free, NEC-based 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, and the Fuse Tools provide fuse sizing plus a Bussmann, Mersen, Littelfuse, and Edison cross-reference.
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.
