We know (or assume!) that the tabulated maximum current-carrying-capacities of cables we work with have been compiled with a built-in allowance for the characteristics of OPDs. For example, a tabulated maximum CCC of, say, 10A appears to indicate that a current of 14.5A for about an hour (which is what a B10 MCB could allow to flow) would not be harmful to the cable.
However, is the same true of accessories? In other words, does a 10A 'rating' of an accessory mean that it is considered able to safely carry 14.5A for an hour? Although I don't know, I suspect not! Is this perhaps why, for example, most light switches are rated at 10A, even though the usual OPD is a B6 MCB (which should operate within about 10 minutes at 10A)?
Kind Regards, John
However, is the same true of accessories? In other words, does a 10A 'rating' of an accessory mean that it is considered able to safely carry 14.5A for an hour? Although I don't know, I suspect not! Is this perhaps why, for example, most light switches are rated at 10A, even though the usual OPD is a B6 MCB (which should operate within about 10 minutes at 10A)?
Kind Regards, John