A few places also used 10A connectors quite widely, e.g. Italy.
It was, and (judging by the ratings of other MCBs) chosen because 16 was a 'basic' Renard preferred number.Wasn't 16 the new 15, like when 16A MCBs replaced 15A fuses?
Indeed. The basic 'R5' Renard series is just 1.0, 1.6, 2.5, 4.0 & 6.3. That gives us (after rounding 6.3 to 6), the familiar MCB sizes of 6A, 10A, 16A, 25A, 40A and 63A. Perhaps more to the point, the 'R10' series includes (in addition to the above) 2.00, 3.15, 5.00 and 8.00 - thereby giving us (after rounding) the 20A, 32A, 50A and 80A MCBs (and also 3A, which one occasionally sees).Thanks for that John. I am familiar with the finer divisions used for component values, but never realised that the mcb values were the 'divided into 5' values.
It would only have been useful to the UK (and a few countries that use UK wiring accessories) so would have been difficult to get a consensus to include them in IEC 60898.Interestingly (in terms of how this discussion started), the R10 series also includes 1.25, so a 13A MCB (after rounding) would have been a possibility - but 'they' presumably decided that it was 'not needed'!
That sounds credible but, as has been said, it has not stopped some manufacturers from producing 13A (and other 'unusual') MCBs. If the In of the MCB not mentioned in the Standard, does that preclude the manufacturer claiming compliance with it?It would only have been useful to the UK (and a few countries that use UK wiring accessories) so would have been difficult to get a consensus to include them in IEC 60898.
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