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by OJFord 1674 days ago
Yes, I struggled to know what to link really - ideally it would be the spec, if only I knew there was one and where to find it! No Wikipedia page on them even.

I've upvoted someone's question on a StackExchange site in the past asking for a standard, and I think accidentally opened a duplicate a year later or something myself:

https://diy.stackexchange.com/questions/177403/euro-modules-...

Anyway, I ended up with this link just because I thought it made the modular concept quite clear; not endorsing theirs specifically. My faceplates and modules are from different manufacturers, many of the modules unmarked generics.