Fundamental rule of protection: Difference between revisions
From Electrical Installation Guide
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- The use of class II insulation materials, or an equivalent level of insulation<br> - Non-conducting location, out of arm’s reach or interposition of barriers<br> - Equipotential bonding<br> - Electrical separation by means of isolating transformers | - The use of class II insulation materials, or an equivalent level of insulation<br> - Non-conducting location, out of arm’s reach or interposition of barriers<br> - Equipotential bonding<br> - Electrical separation by means of isolating transformers | ||
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Revision as of 14:39, 14 September 2012
The fundamental rule of protection against electric shock is provided by the document IEC 61140 which covers both electrical installations and electrical equipment.
Hazardous-live-parts shall not be accessible and accessible conductive parts shall not be hazardous.
This requirement needs to apply under:
- Normal conditions, and
- Under a single fault condition
Various measures are adopted to protect against this hazard, and include:
- Automatic disconnection of the power supply to the connected electrical equipment
- Special arrangements such as:
- The use of class II insulation materials, or an equivalent level of insulation
- Non-conducting location, out of arm’s reach or interposition of barriers
- Equipotential bonding
- Electrical separation by means of isolating transformers
