<P> The regulation requires all socket outlet units to comply with the requirements of BS 1363 - 2 Specification for 13A switched and unswitched socket - outlets and with the requirements of BS 5733 Specification for General requirements for electrical accessories . Sockets and socket outlets do not require independent approval under the regulations . Any plug fitted to the socket outlet unit must comply with the requirements of BS 1363 - 1 Specification for rewirable and non-rewirable 13A fused plugs . Plugs must also be independently approved and marked in accordance with the requirements of the regulation . </P> <P> If a socket outlet unit contains additional control circuits or surge protection circuits they will fall within the scope of the Low Voltage Directive 2006 / 95 / EC and must be CE marked . Socket outlet units with control circuits also fall within the scope of the EMC Directive 2004 / 108 / EC . </P> <P> Examples of power strips exist in the U.S. patent system dating back as far as 1929, starting with the creation of Carl M. Peterson's "Table Tap". Another early example was created by Allied Electric Products in 1950 . </P> <P> Perhaps the first modern designs for the power strip were created by the U.S. firm Fedtro, which filed two patents in 1970 for designs that hew close to designs used in the modern day . </P>

Does plugging a power strip into itself work