You should use the same make as your consumer unit. Mine came with dire
warnings that performance could not be guaranteed and that they would not
comply with the relevant British Standards if installed in an other
manufacturer's consumer unit.
I used Contactum. They work according to my RCD tester. They were the
cheapest I could find, but were 2 modules wide (not a problem for me, I just
bought a bigger consumer unit!) Screwfix do even cheaper ones from Volex,
but they are Type C, so pretty useless for domestic installations. Also, I
couldn't find a large Volex consumer unit. They only stocked diddy 9 way
units. I needed something around 16 to 18 ways.
C'mon Christian, you lend this protectionist FUD b'sht credence by
repeating it, they're made to a standard for a reason, so that they all fit and
work together safely and interchangeably. If you fit another mfrs BS/IEC
approved item there is no risk.
I agree entirely that it is mainly a protectionist policy (possibly with
elements of liability concerns). However, installing them in direct
contravention of their instructions might be picked up on an inspection.
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