Benchmark Matrix: Inductive Motor Locked Rotor Amperes (LRA), Inrush Surge Multipliers, and Backup Generator Sizing Envelopes

<p dir="ltr">### Overview & Physical Modeling Scope</p><p><br></p><p dir="ltr">This benchmark tabular dataset provides empirical and analytical engineering matrices for single-phase alternating-current (AC) inductive motor starting transients, Locked Rotor Amperes (LRA), Full Load Amperes (FLA), starting power factors (cos φ), and emergency generator sizing envelopes under NEMA MG-1 and NFPA 70 (NEC) standards.</p><p><br></p><p dir="ltr">During electrical startup (0 RPM), induction motors produce zero counter-electromotive force (back-EMF), drawing peak inrush currents 4.5x to 7.0x higher than rated continuous running current across the first 100 to 300 milliseconds.

This dataset models continuous running wattage, instantaneous surge volt-amperes, electronic soft-starter current mitigation (-65% to -70% reduction), and minimum recommended generator surge/continuous capacities across residential HVAC compressors, deep well pumps, sump pumps, and workshop machinery.</p><p><br></p><p dir="ltr">### Tabular Data Schema Dictionary</p><p><br></p><p dir="ltr">* **appliance_id** (string): Unique alphanumeric equipment identifier.</p><p dir="ltr">* **equipment_name** (string): Standard engineering equipment name and physical capacity rating.</p><p dir="ltr">* **equipment_category** (string): Functional categorization (`HVAC`, `Water_Pumping`, `Drainage`, `Pneumatic`, `Refrigeration`, `Machinery`, `Recreation`).</p><p dir="ltr">* **nominal_hp** (float): Mechanical horsepower equivalent.</p><p dir="ltr">* **voltage_v** (integer): Nominal operating AC line voltage (120V or 240V split-phase, 60 Hz).</p><p dir="ltr">* **nema_code_letter** (string): NEMA MG-1 locked-rotor kVA/HP designation (Code Letters G through L).</p><p dir="ltr">* **kva_per_hp_range** (string): Standard starting kVA per rated horsepower bracket under NEMA MG-1 Section 10.37.</p><p dir="ltr">* **running_fla_amps** (float): Rated continuous full-load current in Amperes.</p><p dir="ltr">* **running_watts** (integer): Steady-state active real electrical power consumption in Watts.</p><p dir="ltr">* **lra_starting_amps** (float): Peak locked-rotor inrush starting current in Amperes.</p><p dir="ltr">* **inrush_multiplier** (float): Ratio of starting current to running current (`lra_starting_amps / running_fla_amps`).</p><p dir="ltr">* **peak_starting_watts** (integer): Instantaneous starting volt-ampere demand in Watts/VA.</p><p dir="ltr">* **inductive_surge_delta_watts** (integer): Net starting surge step over running wattage (`peak_starting_watts - running_watts`).</p><p dir="ltr">* **soft_start_mitigated_lra_amps** (float): Starting current in Amperes when modulated by a closed-loop electronic soft starter.</p><p dir="ltr">* **soft_start_peak_watts** (integer): Peak starting demand with soft starter in Watts.</p><p dir="ltr">* **min_recommended_generator_continuous_w** (integer): Minimum continuous generator capacity in Watts.</p><p dir="ltr">* **min_recommended_generator_surge_w** (integer): Minimum alternator transient surge capacity in Watts.</p><p><br></p><p dir="ltr">### Governing Standards & Methodology</p><p><br></p><p dir="ltr">* **NEMA MG 1-2021:** Motors and Generators (Section 10.37 Code Letters for Locked-Rotor kVA).</p><p dir="ltr">* **NFPA 70 / National Electrical Code (NEC 2023):** Article 430 (Motors, Motor Circuits, and Controllers).</p><p dir="ltr">* **IEEE Std 399-1997:** IEEE Recommended Practice for Industrial and Commercial Power Systems Analysis.</p><p><br></p><p dir="ltr">All mathematical formulas and interactive simulation workbenches are open-access and reproducible at powelab.org/home-energy/generator-size-calculator.</p>