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.
Overview
Motor insulation resistance testing is one of the most common NETA maintenance measurements — but properly documenting it requires capturing the 1-minute spot reading, the 30-second and 1-minute readings for DAR calculation, and the 1-minute and 10-minute readings for Polarization Index, all corrected to a 40°C reference temperature using the IEEE 43 Kt factor. This record handles the complete test suite. The evaluation mode is selectable: Worksheet (custom or manual thresholds), NETA ATS (motor acceptance), NETA MTS (motor maintenance), or IEEE 43-2013 reference. Winding category determines the minimum IR basis per IEEE 43-2013: post-1970 form-wound AC/DC armature windings (minimum 100 MΩ at 40°C), random-wound stator or form-wound below 1 kV (minimum 5 MΩ), or custom. PI and DAR threshold values are user-configurable. Full motor nameplate documentation covers manufacturer, serial number, frame, type, horsepower, kW rating, voltage, phase, frequency, full-load current, locked-rotor current, service factor, power factor, temperature rise, insulation class, NEMA design, shaft diameter, weight, thermal protection status, connected equipment, and listing. Temperature correction applies the Kt factor (automatic from IEEE 43 lookup or manual override) to correct measured MΩ to 40°C reference. Range multiplier selection handles instruments that output in kΩ, MΩ, or GΩ. Pre-test verification items confirm guard terminal usage, discharge time completion, and test lead condition. Audible interval prompts are available to cue the technician at the 30-second, 1-minute, and 10-minute marks during timed testing. The record closes with comments and observations, deficiencies noted, test conclusion and recommendation, and dual technician and reviewer signature blocks with dates. Status tracking: In Progress, Complete-Pass, Complete-Fail, Incomplete. Data saves to localStorage, exports and imports as JSON, and prints to PDF.
What you'll do
- 01Identify the correct IEEE 43-2013 winding category and minimum IR acceptance value for form-wound and random-wound motor windings and explain why the minimums differ
- 02Apply the Kt temperature correction factor to normalize insulation resistance readings to the 40°C reference temperature specified by IEEE 43
- 03Calculate Polarization Index (10-minute reading ÷ 1-minute reading) and Dielectric Absorption Ratio (1-minute ÷ 30-second reading) and evaluate results against IEEE 43 and NETA threshold values
- 04Document complete motor nameplate data — including insulation class, temperature rise, service factor, and locked-rotor current — and explain how these values provide context for interpreting insulation test results
- 05Apply the correct evaluation mode — NETA ATS for acceptance, NETA MTS for maintenance, or IEEE 43-2013 reference — and explain how acceptance thresholds differ between new-installation and in-service testing
- 06Use audible interval prompts for timed readings, confirm pre-test verification items (guard terminal, discharge, lead condition), and document findings with test conclusion, deficiencies, and dual-signature review
Who it's for
Tags
Keep exploring
Busway / Bus Duct Insulation & Connection Test Report
A NETA-compliant field test record for busway and bus duct acceptance and maintenance testing — capturing insulation resistance (MΩ) and connection resistance (μΩ) per section, wire configuration-aware IR test matrices, a visual bus map with section status tracking, and print-to-PDF output.
Power Panel Insulation Resistance Test Record
A NETA-aligned insulation resistance test record for panelboards, switchboards, MCCs, and switchgear — with per-circuit IR readings, temperature correction, acceptance criteria from NETA ATS, NETA MTS, manufacturer, or custom thresholds, pre-test safety checklist, and JSON export with print-to-PDF output.
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.