14th edition 1970 suggests not using gas or water pipes as the sole means of earthing - presumably the new fangled plastic pipes were a concern, (this would be before PME became so popular.)
15th edition is closer to the current wording.
Not be used as the sole electrode..
16th edition tightens this to not to be used as an electrode at all, where we are today.
By this time PME was pretty common, and some of the issues of diverted currents were coming to light,
and gas meter fitters were instructed to carry bonding kits, so that if the meter is to be removed, the pipes around it are linked for the duration
14th edition 1970 suggests not using gas or water pipes as the sole means of earthing - presumably the new fangled plastic pipes were a concern, (this would be before PME became so popular.)
15th edition is closer to the current wording.
Not be used as the sole electrode..
16th edition tightens this to not to be used as an electrode at all, where we are today.
By this time PME was pretty common, and some of the issues of diverted currents were coming to light,
and gas meter fitters were instructed to carry bonding kits, so that if the meter is to be removed, the pipes around it are linked for the duration
