Motor Circuit Analysis
Deep insights into motor health to prevent failures before they happen. NFPA 70B–aligned diagnostics for reliability and compliance.
Contact UsWhat’s Motor Circuit Analysis?
MCA, formally referred to as just ‘Offline Electric Motor Testing’, is a de‑energized electrical test for motors and power cables. Using low‑voltage AC/DC signals, we compare phase relationships and measure R, L, C, Z and balance to spot turn‑to‑turn winding faults, contamination/moisture, high‑resistance connections, phase imbalance, and rotor‑related anomalies (via Rotor Influence Check where applicable).
For insulation‑to‑ground, we include an IR (megohm) check. Together, the tests build a baseline you can trend and data you can act on.
Tech’s lens: meters and meggers are necessary; MCA finds the winding/rotor faults they miss
| Fault | Meg-ohm Meter (IR) | Multimeter | Motor Circuit Analysis* |
|---|---|---|---|
| Ground faults (insulation-to-ground) | Yes | No | Yes |
| Internal winding faults (turn-to-turn) | No | No | Yes |
| Bad / high-resistance connections | No | Yes | Yes |
| Rotor faults (bars / end rings) | No | No | Yes |
| Contamination / moisture | Yes | No | Yes |
*As performed by Advanced Industrial Maintenance: MCA includes insulation-to-ground measurement and Rotor Influence Check (RIC) where applicable.
Maintenance Impact
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Fewer surprises. Find early faults before they take down a line.
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Hard numbers, not guesswork. Baselines and trends you can act on.
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Zero production drama. De‑energized testing during shutdowns or planned windows.
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Better decisions. Rewind vs. replace vs. monitor—based on data.
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Future‑proofed. Built to current best practices (including NFPA 70B), so you’re ready when others start caring.
Recommended periodicity: Quarterly in Year 1 to establish baselines, then every 6 months (critical assets may stay quarterly).
De-Energized Testing
No interruption to production—performed during outages or planned downtime.
Early Fault Detection
Identifies contamination/moisture, winding faults, phase imbalance, and cable/connection issues before failure.
Trendable Data
Repeatable measurements that build asset health trends for long‑term reliability tracking.
Ready to Add MCA to Your Reliability Program?
Book a motor circuit analysis survey or request a quote today.