This practical guide shows you how to complete a signed, QR-verified LV Switchgear & Motor Control Center (MCC) Checklist certificate in OhmCert Module #12 and how to troubleshoot non-compliant readings on site.

1. Step-by-Step OhmCert UI Workflow

  1. Open Module #12: Navigate to LV Switchgear & Motor Control Center (MCC) Checklist from the Dashboard.
  2. Load a 1-Click Standard Annex Preset: Open the blue Standard Annex banner at the top and click a preset (such as "2500 A Main LV Switchboard (Icu=65 kA, Ipsc=42 kA, Similar Phase Ref)") to populate target limits automatically.
  3. Enter Your Field Measurements: Fill in the measured inputs (Maximum Joint Temperature (IR), Reference / Ambient Temperature, Thermography Reference, Load at Survey, Panel Breaking Capacity Icu, Prospective Short Circuit Current, Phase Current Imbalance). Blank inputs stay neutral PENDING.
  4. Complete the 18-Point Checklist: Grade each item, attach photos if needed, and export the SHA-256 signed PDF certificate.

2. Worked Numerical Field Case Study

Scenario: 2500 A Main LV Switchboard (Icu=65 kA, Ipsc=42 kA, Similar Phase Ref) (IEC 61439-1) — Main LV switchboard thermographic survey under 65% load..

  • Thermography Reference: Similar component, same load
  • Load at Survey: 65 %
  • Panel Breaking Capacity Icu: 65 kA
  • Prospective Short Circuit Current: 42 kA
  • Reference / Ambient Temperature: 34 degC

3. Engineering Troubleshooting: Corrective Actions When a Reading Fails

  1. For NETA MTS Delta-T > 15 degC (vs similar phase) or > 40 degC (vs ambient): schedule immediate de-energization, disassemble the joint, clean oxide, and re-torque to DIN 43673.
  2. Re-distribute single-phase feeders where phase current imbalance exceeds 10%.
  3. Enable current-limiting upstream protection or upgrade breaker Icu where prospective fault current exceeds switchgear rating.

→ Try This Worked Example Live in Module #12 (LV Switchgear / MCC)