by ericmark »
Sun Jun 15, 2008 3:40 pm
If the house already has RCD sockets then maybe the electrician could get away with it? Also if a shower is fitted an RCD would I think be needed to supply that if not already fitted. With only a couple of weeks left before BS7671:2008 kicks in not to fit RCD’s is crazy below is the regulations covering RCD’s in old BS7671:2001 this was from Blue book there may be a change in Brown book but I never bought one.
471-16-01 A socket-outlet rated at 32 A or less which may reasonably be expected to supply portable equipment for use outdoors shall be provided with supplementary protection to reduce the risk associated with direct contact by means of a residual current device having the characteristics specified in Regulation 412-06-02(ii).
This regulation does not apply to a socket-outlet supplied by a circuit incorporating one or more of the protective measures specified in items (i) to (iii) below and complying with the Regulations indicated:
(i) protection by SELV (see Regulations 411-02 and 471-02)
(ii) protection by electrical separation (see Regulations 413-06 and 471-12)
(iii) protection by automatic disconnection and reduced low voltage systems (see Regulation 471-15).
471-16-02 Except where one or more of the protective measures specified in items (i) to (iii) of Regulation
471-16-01 are applied in compliance with the corresponding regulations stated therein. a circuit supplying portable equipment for use outdoors, connected other than through a socket-outlet by means of flexible cable or cord having a current-carrying capacity of 32 A or less, shall be provided with supplementary protection to reduce the risk
associated with direct contact, by means of a residual current device having the characteristic, specified in Regulation 412-06-02(ii).
412-06-02 (ii) the residual current device shall have a rated residual operating current (IΔn) not exceeding 30 mA and an operating time not exceeding 40 ms at a residual current of 5 IΔn, as provided by BS 4293, BS 7071, BS 7288, BS EN 61008-1 or BS EN 61009-1.
531-02-04 A residual current device shall be so selected and the electrical circuits so subdivided that any protective conductor current which may be expected to occur during normal operation of the connected load(s) will be unlikely to cause unnecessary tripping of the device.
601-08-02 Where a shower cubicle is installed in a room other than a bathroom or shower room, outside zones 0, 1, 2 or 3 a socket-outlet, other than a SELV socket-outlet or shaver supply unit, shall be protected by a residual current device with rated operating current, (I∆n), not exceeding 30 mA in accordance with Regulation 412-06.
601-09-03 In zone 3 current-using equipment other than fixed current-using equipment shall be protected by a residual current device with rated residual operating current (I∆n) not exceeding 30 mA in accordance with Regulation 412-06.
I find 531-02-04 interesting as this is reinforced in the 17th Edition and means possible even in the 16th Edition maybe we should have fitted multi-RCD’s depending on the manufacture of the board RCBO’s cost between £12.5 and £35 and can easily be fitted in each individual circuit. Can’t really comment on down lighters.
Yours Eric