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Socket outlets
Regulation 411.3.3 requires that an RCD not exceeding
30mA be provided for:
i. Socket outlets up to 20A that are for general use by
‘ordinary persons’.
ii. Mobile equipment up to 32A that is for use outdoors.
One exception is permitted where the use of the socket outlet is
under the supervision of someone ‘skilled’ or ‘instructed’.
So, for commercial or industrial applications the designer will
need to consult with the client about whether someone who
is ‘skilled’ or ‘instructed’ will normally supervise the installation
before deciding which socket outlets need RCD protection.
Another exception is for a specific labelled/identified
socket-outlet for a particular item of equipment.
Clearly ‘ordinary persons’ will use some commercial installations
i.e. ‘persons who do not have the necessary knowledge to
avoid the dangers from electricity.’ If this is the case then the
designer/installer may decide to provide RCD protection to all
socket outlets.
For socket outlets used by cleaners, those in common or
circulation areas, in self-catering areas or which might supply
outdoor equipment, it is generally considered that RCD
protection is required.