Protection for Safety

Part 4, chapters 41 to 45

Describes the various measures that are available to the installer and designer for the protection of people, property and livestock against Electric Shock, different definitions are now used for the 17th edition BS7671;2008.

Residential Requirements

Example
The electrical system should be designed and installed so that live parts shall not be accessible and accessible conductive parts should not cause a hazard to the user.

What it means
Various measures can be employed to protect the users, shielding the live parts with enclosures and insulation are the most common. Additional protection is normally provided with Residual Current Devices.

Solution
Insulating the whole system and providing automatic disconnection of the supply definitions are now;

• Basic protection (enclosures, insulation)
• Fault protection (disconnection with mcb’s)
• Additional protection (RCD) where needed

Supporting Products
Consumer Units

Commercial Requirements

Example
The electrical system should be designed and installed so that live parts shall not be accessible and accessible conductive parts should not cause a hazard to the user.

What it means
Various measures can be employed to protect the users, shielding the live parts with enclosures and insulation are the most common. Additional protection is normally provided with Residual Current Devices.

Solution
Insulating the whole system and providing automatic disconnection of the supply definitions are now;

• Basic protection (enclosures, insulation)
• Fault protection (disconnection with mcb’s)
• Additional protection (RCD) where needed

Supporting Products
Consumer Units