Quote:
Originally Posted by pmmunro
This posting is of interest to me as I need information about when shutters on socket outlets were first used.
Unfortunately, the pictures are not close enough for me to see which sockets have shutters, if any.
Can anyone help me find out when shutters were first used please? I need verifiable information, so it would have to be backed by catalogues, standards or similar.
PMM |
An advert in my 1929 'Sunco' catalogue shows an 'MK' anti-flash socket (2-pin 5 and 15A versions) that has shutters covering the inserts as soon as the plug is withdrawn. This is marketed more as an arc-reduction device (it isn't switched) than a safety shutter however.
MEM 13A sockets advertised in May 1955 gave great prominence to shutters; not quite a 'unique selling point', but nearly!