I think it's another one of those situations where well established, tried and tested and almost universally accepted methods, don't quite align with wording of the regs. Certainly threaded steel conduit has been embedded into plaster and even concrete structures for as long as I can remember and unless it's corroded almost to the disintegration, continuity seems to be as reliable as any other method.

The conlok system I'd be more wary of - we used to have a "pin grip" conduit system (albeit with thin walled butt seamed enamelled conduit) in the days of cotton covered rubber wiring in domestics - and it was so reliable the regs specifically banned it for many years. I'm sure the modern grub screw systems are fine for surface use indoors, but personally I'd be wary of using it in embedded situations.

    - Andy.

I think it's another one of those situations where well established, tried and tested and almost universally accepted methods, don't quite align with wording of the regs. Certainly threaded steel conduit has been embedded into plaster and even concrete structures for as long as I can remember and unless it's corroded almost to the disintegration, continuity seems to be as reliable as any other method.

The conlok system I'd be more wary of - we used to have a "pin grip" conduit system (albeit with thin walled butt seamed enamelled conduit) in the days of cotton covered rubber wiring in domestics - and it was so reliable the regs specifically banned it for many years. I'm sure the modern grub screw systems are fine for surface use indoors, but personally I'd be wary of using it in embedded situations.

    - Andy.