Check points for absence of voltage
Follow this procedure as last LOTO actions to reach status 2 in the equipment.
CHECK POINTS FOR ABSENCE OF VOLTAGE
1. Wear the appropriate PPE based on the electrical arc studies and the risk assessment carried out by the customer.
2. Ensure the correct operation of the multimeter.
3. Once the equipment is stopped, wait until the different storage buses are discharged (4 or 5 min).
4. Check that NB 120’s LED are NOT illuminated.
5. Remove polycarbonate to be able to measure voltage, both in the plates upstream of the disconnector and in the
plates downstream of the disconnector.
6. Short-circuit the input and ground it.
7. There will be no voltage in the equipment.
The absence of voltage must be verified once an equipment has been isolated, with the necessary means
and PPE.
In addition, the charger specific diagrams of the installation should be reviewed.
Even the multimeters have scheduled revisions, it is convenient always to check the multimeter is working
fine before taking any measure, especially to prove dead. This might be damaged and show false values.
Use a commercial proving unit to check it.
Use appropriate equipment for DC power measures.
It is responsibility of the technical personnel to have their tools calibrated and in good conditions.
Always wear the PPE according to electric risk and to the current H&S regulations.
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