Double tap transformer?

[Julie.]

As @Julie. says our regulations are much more calculation-based in terms of what is allowed. In terms of the LV side then most circuits need overload protection (regulation 433.2), unless fixed loads where that is not likely and some other details (regulation 433.3), but practically all circuits need fault protection (regulation 434).

The closest we have to your rules is the 3m limit on conductors not adequately protected in themselves (but protected down-stream) which typically is taps of a bus-bar chamber and the case mentioned above where the DNO supply is not known to protect the first stage of the installation.

Here is the main bit for 433 on overload:
View attachment 93813
View attachment 93814
And here is the main bit for 434 fault protection:
View attachment 93815

View attachment 93816

Apologies for the warped photos of the regs book!

But the warped photos, appear so appropriate........