HELP! Plumber sparks argument! Advice needed

[davesparks]

Why is that then?

The plasterboard ceiling will normally form the boundary of the fire compartment

 

[sedgy34]

Had a week long argument with the plumber on this and would be good for some advise.
i install new build electrical first fix, we fix our cables to directly the concrete slab, however when we come to a heating or gas pipe we run the cable underneath the pipe. This may not look as neat but stops the cable from ever sagging and preventing any potential issue. The plumber argues that the cable should go above for general tidiness them we should provide lagging (for his pipes).

Whos right?

We use knockins too!
Doesn't matter where you put your runs cables and pipes do cross each other.
I would have cables under pipes instead of sitting on top but depends if plumber is in the new build before you for first fix.
Don't start lagging his pipes lol