Anybody know p clip distances

[baz-r]

its says. (in genral construction)
"All electrical cables/wires must be free from chaffing and secured at intervals of at least every 300mm unless contained in a secure hollow component."

cant find anything with an actual mesurement at the mo for brake and fuel pipes but i cant see why the trans tunnel would be any diffrent from the floor,rear axel area or engine bay.
i dont think any production car has clip spacing as tight as 100mm (4in)