Electrical Hazards
6. Risks when Working on High Voltage Installations
6.1. Personal Protection Equipment
Depending on the jobs to carry out:
- Low Voltage, when a complete enclosure exists:
- Basic PPE (safety helmet, footwear and goggles).
- Low Voltage, when no enclosure exists:
- Basic PPE (safety helmet, footwear and goggles).
- Kit for Low Voltage jobs (including fireproof clothing).
- High Voltage, local manoeuvres:
- Basic PPE (safety helmet, footwear and goggles).
- Facial screen with protection against electric arcs (infrared and ultraviolet radiation, burns and projections).
- Fireproof gloves and, over these, insulating gloves suitable for the voltage.
- Fireproof clothing.
- High Voltage, local manoeuvres:
- Basic PPE (safety helmet, footwear and goggles).
6.2. Equipment for high voltage jobs and manoeuvres
a) Insulating Stools or Benches.
- Depending on the possible use they are to be put to, these may be:
- Indoor.
- Outdoor.
- It shall be designed for an appropriate insulating voltage for the job to be carried out and is to have inclined legs that stop it from overturning.
- In the outdoor models, the legs are to be provided with insulating hoods that impede the formation of a continuous film of water in the case of rain.
- It shall be used to test the absence of voltage with the insulating rod as well as to position the earth clamps.
- When used, it is to be situated far from those surrounding parts that are earthed (walls, metallic shelters, etc.), and the operator is to avoid Contact with these parts.
- In some cases, the insulating stool may be replaced by an insulating mat.
| CLASS | PERFORATION VOLTAGE (KV) | RATED VOLTAGE OF THE INSTALLATION (KV) |
|---|---|---|
| I | 50 | U ≤ 20 |
| II | 70 | U ≤ 30 |
| III | 95 | U ≤ 45 |
| IV | 140 | U ≤ 66 |
