Ask the experts/Technical
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We continue with our series of answers to some of the more frequently asked questions put to our Technical Helpline.
QUESTION
ANSWER
Is it permissible to install a wall-mounted extractor fan having a rated voltage of 230 V within zone 1 of a room containing a bath (or shower)?
Yes. Ventilation equipment is included in the list of fixed and permanently connected current-using equipment that may be installed in zone 1 of a location containing a bath or shower, provided it has a degree of ingress protection to at least IPX4 and is suitable for installation in zone 1 according to the manufacturer’s instructions (Regulation Group 701.5 refers).
QUESTION
ANSWER
How many points should be recorded for a twin socket-outlet, in the box titled ‘Number of points served’ which forms part of the Schedule of Circuit Details for the Installation?
Where the fixed wiring is terminated at a particular point, regardless of whether the termination is for connection of an accessory having single or multiple outlets or an item of current-using equipment, the number of points served is one.
QUESTION
ANSWER
Are there any specific requirements to consider when designing a circuit to supply a hot tub?
It is clear that the user of a hot tub is at a greater risk of death due to, for example, reduced body impedance and being in contact with the general mass of Earth. BS 7671 does not provide specific requirements for electrical installations associated with hot tubs. However, it is reasonable for the contractor to apply engineering judgement and to class hot tubs as either a bath or basin depending on its location. For example, where a hot tub is in an indoor location, such as a garden shed or cabin it might be reasonable to apply the full requirements of Section 701 (Locations containing a bath or shower) or where a hot tub is located outdoors in the open air the full requirements of Section 702 (Swimming pools and other basins) might be applied. It would be wise for the contractor to liaise with the hot tub installer prior to the installation of the circuit to ensure that the manufacturer’s instructions have been adequately considered as well as the recommendations, where relevant, of BS EN 60335-2-60 (Household and similar electrical appliances. Safety. Particular requirements for whirlpool baths and whirlpool spas) (Regulation 110.1.3 refers).
Connections Winter 2015-2016
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