Yes, I did remind you of that - so what? 13A is a rating that is not qualified by a descriptor such as "short-term", "single-outlet only", etc.For a start, it's only a few days since you reminded me that a manufacturer's 'rating' means nothing unless qualified - e.g. in relation to the duration of load to which it refers, ambient conditions, mounting method etc.I'm sorry to hear that you and BAS find it hard to understand.If they were not intended to carry 13A, why would they be marked 13A?
Well, at least in some senses (and for at least some manufacturers) the short answer appears to be 'yes' ....Does a 32A MCB have a different rating when installed next to another? or, indeed, when it is fitted with a double or triple toggle as part of a two-pole or three-pole MCB?Mr Wylex said:Adjacent thermal-magnetic MCBs should not be continuously loaded at or approaching their nominal rated currents when mounted in enclosures. It is good engineering practice to apply generous derating factors or make provision for adequate free air between devices. In these situations, and in common with other manufacturers, we recommend a 66% diversity factor is applied to the MCB nominal rated current where it is intended to load the MCBs continuously (in excess of 1 hour).
Kind Regards, John
The Wylex quote refers to mounting in enclosures. In engineering terms, it is saying that the Ithe rating is less than the Ith rating.
Sorry about that lousy formatting, I'm busy backing-up the laptop before I hand it back tomorrow - I'm retiring, as of 31 Dec!
Would that be Major Recall Wylex ? We know him well