Does main bonding in every circumstance always need to be under 0.05. main bonding in a house where the main water was moved has 10mm cable but resistance of 0.25 ohms!!>>
You are supposed to verify the continuity of the conductor when disconnected so it is all about the csa and length., the measurement of 0.05 ohms is nothing to do with the length of the main bonding conductors as I see it