This is an extract from the NICEIC TECHNICAL MANUAL
SINKS, DOMESTIC AND COMMERCIAL S S145-1
Accessories in close proximity to
Contents
1. Introduction
2. Domestic premises
3. Commercial premises
1. Introduction
Electrical installation designers often ask how close a socket-outlet or other accessory is permitted to be installed to a domestic or commercial kitchen sink, or to a wash basin in a bedroom or cloakroom.
The simple answer is that BS 7671 does not specify a minimum distance. However, Regulation 512-06-01 requires due account to be taken of external influences. An extract from the regulation is reproduced below for ease of reference:
Extract from Regulation 512-06-01:
‘Every item of equipment shall be of a design appropriate to the situation in which it is to be used or its mode of installation shall take account of the conditions likely to be encountered.’
2. Domestic premises
Domestic kitchens, bedrooms and cloakrooms (unlike bathrooms and shower rooms) are not included amongst the special installations or locations in Part 6 of BS 7671 and are not rooms where the resistance of the body is likely to be significantly reduced. Therefore, normal precautions against electric shock should be adequate and the general rules of BS 7671 are applicable.
However, whilst BS 7671 does not forbid the installation of a socket-outlet or other accessory close to a sink in a domestic kitchen, bedroom or cloakroom, the requirements of Regulation 512-06-01 have to be taken into account.
The requirements of Regulation 512-06-01 mean that ordinary BS 1363 socket-outlets and similar accessories are not suitable to be installed so close to sinks or draining boards that they are likely to be splashed with water or operated with wet hands.
The penetration of water into an accessory could have serious effects. Water entering the terminals and mechanism may lead to corrosion, internal arcing, general degradation and eventually malfunction. Additionally, and more seriously, water may provide a track for the phase voltage to be transmitted to the front cover of the accessory, giving rise to the risk of electric shock.
A rule of thumb recommendation for domestic premises, to avoid the effects of splashing, is that ordinary BS 1363 socket-outlets and similar accessories should ideally be mounted not less than about 300 mm (ideally not less than about 1000 mm), in the horizontal plane, from the extremity of a sink top or wash basin.
Where splashing of accessories cannot be avoided, equipment having a degree of protection of at least IPX4 (protection against water splashing from any direction) or IPX5 (protection against water jets from any direction) is likely to be required. This type of equipment is, of course, unlikely to be visually acceptable in most domestic situations indoors.