Strange that Pushrod, i spoke to some of his colleagues and they disagreed with th 0.05 ohms and so do i. I can not see how restricting the resistance to 0.05 will achieve anything. I believe its his job to update GN3 so may be he can clarify for the new GN3.
Also, the ECA NICEIC and SELECT all agreed, someones wrong
The other point is, if this was the case then why in 701.415.2 refer you to 415.2.2 for the effectiveness of main bonding?
Why does it not say 0.05?
Theres no requirement to keep the touch voltage below 50v in general installations, due to supply impedance, in most cases little current will flow in the bonding(tn tt).
I fail to see what it will achieve.