When the motor shocks the body, this is not a minor nuisance, but a direct threat to life. Such an engine cannot be operated until the cause is eliminated. Let's figure out why this happens and what to do.
Why the motor is electrocuted
- Breakdown of the winding insulation on the housingThe most common reason. The insulation has become old or damaged, and the phase has “shorted” to the metal.
- No or broken grounding.Without grounding, even a small leak is felt like a blow.
- Moistening of the windingMoisture reduces the insulation resistance, a leak appears.
- Damage to the power cableinside the terminal box.
What to do immediately
- Disconnect the motor from the network.
- Do not touch the housing while it is energized.
- Check the presence and integrity of the grounding.
- Call a specialist to measure the insulation resistance.
How to check the cause
The key test is measuring the insulation resistance with a megger. It shows whether there is leakage between the winding and the housing. The norm is considered to be a resistance not lower than that specified for the voltage class; upon breakdown, it drops to values close to zero.
| Measurement result | Output |
|---|---|
| High resistance | Insulation is normal, look for grounding |
| Low / zero | Insulation breakdown - need rewinding or drying |
If the reason is moisture, drying the winding sometimes helps. In the event of a real insulation breakdown, rewinding of the winding is required. An accurate diagnosis is provided by instrumental diagnostics in Tashkent.
Is the engine electrocuted? Don't take risks - it's dangerous. Elektromotors engineers in Tashkent will check the insulation and eliminate the cause with a guarantee of safety - leave a request.