3 as the area above zone 2 up to a height of 3 m, as well as the area that is horizontally within 2.4 m from zone 2; from BS 7671:2008, this is replaced by the term outside the zones. This includes any space under the bath or shower that can only be accessed with a tool. Within zone 0, no devices are allowed apart from suitable equipment and/or insulated pull cords. Previously, in zone 1, only separated extra-low voltage (SELV) devices were permitted. Any AC transformer supplying such a device must be located outside zones 0–2. Since the introduction of the 17th edition of the IET Wiring Regulations in 2008, 230 V fixtures such as light fittings and extractor fans are permitted in zones 1 and 2, subject to those fixtures meeting the appropriate ingress protection ratings. The minimum required ingress protection rating in zone 0 is IPX7 in zone 1 and IPX4 in zone 2. If water jets are likely to occur, at least IPX5 is required in zones 1–3. Otherwise, in zone 3 and beyond, an ingress protection rating of IP20 is the minimum required. Equipment in zones 1 and 2 must be protected by a 30 mA residual current device (RCD). Shaving sockets (with isolating transformer) are permitted in zone 2 if direct spray from a shower is unlikely, even if they are only IP20. Before the 2008 regulations, such shaving sockets were the only sockets permitted in a bathroom or shower room. Since BS 7671:2008 normal domestic sockets are permitted, at distances greater than 3 m from the edge of the zones, providing the circuit is RCD protected. As the new regulations require all general purpose sockets not for use by skilled or instructed persons to be RCD protected, this effectively permits normal wiring in the larger bathroom. (Earlier British wiring rules in bathrooms used to be far more restrictive, leading to British peculiarities in bathrooms such as the use of cord switches. The 2011 edition of the wiring regulations is more flexible now, placing restrictions on bathroom installations that are now similar to those in other European countries.) Swimming pools For swimming pools, Section 603 of BS 7671 defines similar zones. In some of these zones, only industrial sockets according to IEC 60309 are permitted, in order to discourage the use of portable domestic appliances with inappropriate ingress protection rating. Portable outdoor equipment For