415.1.2 The use of RCDs is not recognized as a sole means of protection and does not obviate the need to

apply one of the protective measures specified in Sections 411 to 4 14.

So while an RCD is clearly part of an ADS system, use of just an RCD on its own is not enough. Normally of the options permitted, the other measure you would combine would be 4.11 - the use of a CPC, but you may prefer one of the others such as an isolation transformer to make it an IT installation, or conversion to a lower voltage as  FLEV PELV or SELV so a shock is unlikely to give  fatal current.

Arguably actually all these measures are similar as in a sense bonding is also a measure that lowers the voltage to which a victim may be subjected.


I'm  not sure how you think this contradicts  that advice?.

531 .3.6 RCDs for additional protection

The use of RCDs with a rated residual operating current not exceeding 30 rnA is recognized as additional protection

in compliance with Regulation 415.1. These RCDs shall be provided to comply with the requirements of Regulation 411.3.3.

So for additional protection, against crass stupidity  of users, or compromise of the intended protection mechanism, such as mechanical damage to the CPC. Or as they put it

additional protection in the event of failure of the provision for basic protection and/or the provision for fault protection or carelessness by users.

415.1.2 The use of RCDs is not recognized as a sole means of protection and does not obviate the need to

apply one of the protective measures specified in Sections 411 to 4 14.

So while an RCD is clearly part of an ADS system, use of just an RCD on its own is not enough. Normally of the options permitted, the other measure you would combine would be 4.11 - the use of a CPC, but you may prefer one of the others such as an isolation transformer to make it an IT installation, or conversion to a lower voltage as  FLEV PELV or SELV so a shock is unlikely to give  fatal current.

Arguably actually all these measures are similar as in a sense bonding is also a measure that lowers the voltage to which a victim may be subjected.


I'm  not sure how you think this contradicts  that advice?.

531 .3.6 RCDs for additional protection

The use of RCDs with a rated residual operating current not exceeding 30 rnA is recognized as additional protection

in compliance with Regulation 415.1. These RCDs shall be provided to comply with the requirements of Regulation 411.3.3.

So for additional protection, against crass stupidity  of users, or compromise of the intended protection mechanism, such as mechanical damage to the CPC. Or as they put it

additional protection in the event of failure of the provision for basic protection and/or the provision for fault protection or carelessness by users.