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1) BS 1363 = 13A Plug
2) BS 1362 = Fuse found in 13A Plug
3) BS 546 = Old UK 3 round pin plugs
4) BS 4573 Shaver plug 2 x 0.2” pins (5.08mm) 5/8” apart (15.88mm)
5) Europlug 2 x 4mm pins 13.5mm apart.
Both 4 and 5 will often fit in a shaver socket but when both are used one can strain the socket for good connecting with other but at 20VA which is less than 0.01A on shaver socket and 2.5A for europlug it is unlikely to cause fire as a result.
The The Plugs and Sockets etc. (Safety) Regulations 1994 is quite a lot of reading but the list of Excluded Electrical Devices is the easy bit to read.
So with the exception of BS 4573 all plugs must be non reversible fused 3 pin to BS 1363, BS 546 or adaptor to BS 5733 unless the unit is designed to be built in.
The other exception is items like computers, which are fitted with a plug other than a standard plug, which is designed to engage with a compatible portable multiple socket outlet.
I am uncertain as to an appliance which is fitted with a plug transformer although these appear in the excluded list not sure if this is because the BS number changes or to allow them to be used with non 13A plug.
I have had problems as the weight of a transformer means these will not hold into many of the adaptors and I have bought some sockets while on holiday specially for these transformers so the fit snug around the tapered outer of the plug. As shown here
although these
will take the German Schuko they will not work with the French design so have limited use.
So I would not think it is legal unless it is a fixed appliance and a pump could be a fixed appliance and it could be considered as reasonable to use a plug and socket which is unlikely to used by other items and so unlikely to be left unplugged in the same way as the Walsall plug
shown at bottom is used.
2) BS 1362 = Fuse found in 13A Plug
3) BS 546 = Old UK 3 round pin plugs
4) BS 4573 Shaver plug 2 x 0.2” pins (5.08mm) 5/8” apart (15.88mm)
5) Europlug 2 x 4mm pins 13.5mm apart.
Both 4 and 5 will often fit in a shaver socket but when both are used one can strain the socket for good connecting with other but at 20VA which is less than 0.01A on shaver socket and 2.5A for europlug it is unlikely to cause fire as a result.
The The Plugs and Sockets etc. (Safety) Regulations 1994 is quite a lot of reading but the list of Excluded Electrical Devices is the easy bit to read.
So with the exception of BS 4573 all plugs must be non reversible fused 3 pin to BS 1363, BS 546 or adaptor to BS 5733 unless the unit is designed to be built in.
The other exception is items like computers, which are fitted with a plug other than a standard plug, which is designed to engage with a compatible portable multiple socket outlet.
I am uncertain as to an appliance which is fitted with a plug transformer although these appear in the excluded list not sure if this is because the BS number changes or to allow them to be used with non 13A plug.
I have had problems as the weight of a transformer means these will not hold into many of the adaptors and I have bought some sockets while on holiday specially for these transformers so the fit snug around the tapered outer of the plug. As shown here
So I would not think it is legal unless it is a fixed appliance and a pump could be a fixed appliance and it could be considered as reasonable to use a plug and socket which is unlikely to used by other items and so unlikely to be left unplugged in the same way as the Walsall plug