Shower with no RCD or supplementary bonding

MrJack96: 
 

That’s mad!! So in theory what are the hazards of an electrical shower wich is not accessible but no RCD protecte and no supplementry bonding? my guess is it only becomes dangerous if there’s a fault which we are exposed to and we touch another bit of earthed metal work ie a tap which is not as well earthed to keep the touch voltage down? 

Since 17th Edition BS 7671:2008, BS 7671 has conditions for omission of supplementary protective equipotential bonding in bathrooms. So, BS 7671 agrees with you … sort of. The conditions are contained in Regulation 701.415.2:
 

Where the location containing a bath or shower is in a building with a protective equipotential bonding system in accordance with Regulation 411.3.1.2, supplementary protective equipotential bonding may be omitted where all of the following conditions are met:

(iv) All final circuits of the location comply with the requirements for automatic disconnection according to Regulation 411.3.2
(v) All final circuits of the location have additional protection by means of an RCD in accordance with Regulation 415.1.1
(vi) All extraneous-conductive-parts of the location are effectively connected to the protective equipotential bonding according to Regulation 411.3.1.2.

NOTE: The effectiveness of the connection of extraneous-conductive-parts in the location to the main earthing terminal may be assessed, where necessary, by the application of Regulation 415.2.2.

MrJack96: 
 

That’s mad!! So in theory what are the hazards of an electrical shower wich is not accessible but no RCD protecte and no supplementry bonding? my guess is it only becomes dangerous if there’s a fault which we are exposed to and we touch another bit of earthed metal work ie a tap which is not as well earthed to keep the touch voltage down? 

Since 17th Edition BS 7671:2008, BS 7671 has conditions for omission of supplementary protective equipotential bonding in bathrooms. So, BS 7671 agrees with you … sort of. The conditions are contained in Regulation 701.415.2:
 

Where the location containing a bath or shower is in a building with a protective equipotential bonding system in accordance with Regulation 411.3.1.2, supplementary protective equipotential bonding may be omitted where all of the following conditions are met:

(iv) All final circuits of the location comply with the requirements for automatic disconnection according to Regulation 411.3.2
(v) All final circuits of the location have additional protection by means of an RCD in accordance with Regulation 415.1.1
(vi) All extraneous-conductive-parts of the location are effectively connected to the protective equipotential bonding according to Regulation 411.3.1.2.

NOTE: The effectiveness of the connection of extraneous-conductive-parts in the location to the main earthing terminal may be assessed, where necessary, by the application of Regulation 415.2.2.