Here in the UK, I have known the power company mains to be pyro, generally something akin to 16mm 2 core, although obviously the old imperial equivalents [Linked Image]. This mainly seems to happen on blocks of flats (apartments) built for social housing in the 50s. The PoCo main incomer to the building will be 'normal cable', a distribution unit of some kind in the basement or service area, and pyro to the individual main fuses/meter cases. The scary thing for me was to see that they treated the pyro the same as any other cable, just had the sealing pot sat on the end, 2 sleeved conductors to the service fuse block, and a clamp for the earth. I guess it cost them less than a custom [pyro only] box for the mainfuse and neutral link.
Again, these cables seem to be in excellent condition, and were left alone during the remodel, the only part of the electrical system that wasn't totally ripped out.