Interactive labs, calculators & simulators
49 browser-based tools across 11 disciplines. Filter by category, difficulty, audience, or status.
Motor Branch-Circuit Conductor & OCPD Study Tool
Size branch-circuit conductors, overload protection, and OCPD for single-motor circuits under NEC Article 430 — with a live one-line diagram, motor starting current simulation, illustrative TCC, Table 430.52(C)(1) multiplier matrix, copper-vs-aluminum comparison, and self-test mode.
Motor IR / DAR / Polarization Index Test Record
A NETA and IEEE 43-aligned field test record for motor insulation resistance, DAR, and PI testing — with full motor nameplate capture, IEEE 43-2013 winding category minimums, automatic temperature correction to 40°C using Kt, timed audible interval prompts, and technician/reviewer dual signatures.
Motor Starting Simulator
Compare Across-the-Line, Reduced Voltage Auto-Transformer, Soft Starter, and VFD starting methods on live current, speed, and torque curves — with configurable HP, inertia, NEMA design class, and voltage from 208 V to 4160 V.
Multiple Motor Feeder & Service Calculator
Add multiple motors and optional non-motor loads to size a feeder conductor and feeder OCPD under NEC Article 430 — two distinct calculations (430.24 and 430.62) with FLC table lookups, a step-by-step trace, and six common-mistake guards built in.