In a ground floor flat with a cellar at the front of the house a steel gas main (40mm o/d) enters the cellar from the street, passes the DB, and somewhere, hidden in the house structure, it splits up into 3 x 25mm O/D to service 3 flats.
One of these steel pipes comes out through the rear outside wall of the ground floor flat and connects to an external gas meter. After this 22mm copper pipe re-enters the flat.
There is a 10mm earth cable looped from one side of the meter to the other with standard earth clamps.
In the cellar a 10mm earth goes from the main earth terminal by the DB, to the main incoming 40mm steel pipe.
Is this satisfactory ? The wiring is approx. 7 years old.
I am a surveyor, not a sparks and don
One of these steel pipes comes out through the rear outside wall of the ground floor flat and connects to an external gas meter. After this 22mm copper pipe re-enters the flat.
There is a 10mm earth cable looped from one side of the meter to the other with standard earth clamps.
In the cellar a 10mm earth goes from the main earth terminal by the DB, to the main incoming 40mm steel pipe.
Is this satisfactory ? The wiring is approx. 7 years old.
I am a surveyor, not a sparks and don