ADS

Simon Barker:ADS still applies to class I appliances, which are always earthed through their supply cable.

So, this is really where I'm coming from in saying this is a discussion about IEC 61140. BS 7671 provides provision (earthing and protective devices) for ADS for 2 reasons:


1. It's needed for Class I appliances


2. There may be parts of the installation that have conductors protected by basic insulation, installed in conductive enclosures or other equivalent wiring systems (SWA or MICC or single-insulated conductors in conductive containment arrangements effectively equivalent to Class I)


BS 7671 does not include provision for ADS to provide 100 % protection against electric shock.

Simon Barker:ADS still applies to class I appliances, which are always earthed through their supply cable.

So, this is really where I'm coming from in saying this is a discussion about IEC 61140. BS 7671 provides provision (earthing and protective devices) for ADS for 2 reasons:


1. It's needed for Class I appliances


2. There may be parts of the installation that have conductors protected by basic insulation, installed in conductive enclosures or other equivalent wiring systems (SWA or MICC or single-insulated conductors in conductive containment arrangements effectively equivalent to Class I)


BS 7671 does not include provision for ADS to provide 100 % protection against electric shock.