General
MCCB ( Step by Step) Preventive Maintenance
1. Safety First (Mandatory) Before touching anything: Apply Lockout/Tagout (LOTO) on the feeder Verify zero voltage with a calibrated meter (phase-to-phase and phase-to-ground) Wear appropriate PPE (arc-rated gear if required by site) Confirm ...
VCB Troubleshooting Quick Guide
If your VCB (Vacuum Circuit Breaker) is not closing, the issue is usually mechanical, electrical (control circuit), or safety interlock related. Here’s a practical troubleshooting approach based on field experience: 1. Check Control Power Verify ...
Switchgear Preventive Maintenance Guide
1. Safety First De-energize equipment and apply LOTO (Lockout/Tagout) Verify absence of voltage (use properly rated tester) Wear proper PPE per NFPA 70E Discharge stored energy (springs, capacitors) 2. Visual Inspection Check for: Dust, dirt, ...
Primary Injection Test (Step by step)
Isolate the breaker Rack out or ensure it’s in test position Connect the test set Connect output leads to line and load terminals For 3-phase: test phase-by-phase Connect measurement devices Ammeter / CT secondary if needed Check all connections ...