Good afternoon, can anyone tell me when double insulated appliances were introduced to the market.
Good afternoon, can anyone tell me when double insulated appliances were introduced to the market.
The idea of 2 core leads and extra insulation to give double fault to danger was sort of out there long before they were called that by the IEC - and they created the formal classes I and II we know from 1969 onwards
It was introduced in the UK much earlier than that acknowledgement ... in the 1950s.
The first double insulated Hoover vacuum cleaner in the UK, the 1224 (double insulated version of the Class I 119) was introduced in1957. Many "119" machines were later converted to Class II during repair and refurbishment - however, I doubt this was "legitimate", and there were certainly physical differences (apart from simply the lack of the protective conductor, and sleeving over certain live conductors).
'When this memorandum was first issued as BS 2754 : 1956 its purpose was to explain the principles and requirements for the, then, new constructional method of double insulation.'
Yes, I believe that this was the first acknowledgement in a standard that became what we now know as "IEC 61140".
The idea of 2 core leads and extra insulation to give double fault to danger was sort of out there long before they were called that by the IEC - and they created the formal classes I and II we know from 1969 onwards
It was introduced in the UK much earlier than that acknowledgement ... in the 1950s.
The first double insulated Hoover vacuum cleaner in the UK, the 1224 (double insulated version of the Class I 119) was introduced in1957. Many "119" machines were later converted to Class II during repair and refurbishment - however, I doubt this was "legitimate", and there were certainly physical differences (apart from simply the lack of the protective conductor, and sleeving over certain live conductors).
'When this memorandum was first issued as BS 2754 : 1956 its purpose was to explain the principles and requirements for the, then, new constructional method of double insulation.'
Yes, I believe that this was the first acknowledgement in a standard that became what we now know as "IEC 61140".
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