So one with an additional feature and one without what we consider all the basic requirements, where are they used?

So one with an additional feature and one without what we consider all the basic requirements, where are they used?

Sparkingchip said:

So one with an additional feature

 Sparkingchip  The only "additional feature" of the 1835 over the 1741 appears to be the "2x" test for RCDs ... but that can usually be done, if you really need it, with the VAR setting on a 1741?

With Amendment 2, it could be argued that the 1741 is now over-specified for the UK (AC testing only, with the only "tripping" test being 1x ... it could be argued that the 1/2 times test isn't specified in BS 7671, but it never was ... another rabbit hole perhaps unless you take the Australian view that "some form of trip, but not tripping time measurement, is acceptable").