What specific action should be taken immediately upon discovering elevated insulation resistance readings during electrical system testing?

Upon discovering *loweredinsulation resistance readings (not elevated) during electrical system testing, the immediate action should be to de-energize the affected circuit or equipment and investigate the cause of the low resistance. Insulation resistance testing measures the ability of the insulation surrounding electrical conductors to prevent current leakage. Low insulation resistance indicates that the insulation is compromised, potentially due to moisture, contamination, physical damage, or degradation over time. Continuing to operate equipment with compromised insulation poses a significant risk of electrical shock, short circuits, and equipment failure. De-energizing the circuit removes the electrical hazard and prevents further damage. The subsequent investigation should involve a thorough visual inspection of the insulation for signs of damage or contamination. If visual inspection is inconclusive, further testing may be required to pinpoint the exact location and cause of the insulation failure. Once the cause is identified, the damaged insulation must be repaired or the affected component replaced before the circuit or equipment is re-energized. Operating with compromised insulation is a safety hazard and can lead to costly downtime.