wander lead

[davidcaulfield]

This is going to sound stupid but when testing the continuity of bonding conductors does everyone else connect a lead to the met then test the from the lead to the cable?

 

[pushrod]

the 0.05 ohms is the reading you should get between separately bonded services, e.g. water to gas. the resistance of any bonding cable will depend on it's length and csa. e.g 10mm is 0.018ohms per 10m.

Hi Tel

I remember having long discussions about this a couple of years ago - as i'm not really involved with it much anymore I find I'm forgetting stuff quicker than my hair is falling out - shame i can't remember what the outcome was - but there certainly was one argument that was along the lines of a main protective bonding conductor should have a resistance of no more than 0.05 ohms (and that was why a 10mm MPBC should be no longer than 27M) - otherwise the voltage on the water pipe (or whatever) would not rise high enough to prevent a lethal current flowing through the person touching the line and the water pipe... or something like that.

Making my brain hurt just trying to remember lol

 

[amo]

Disconnect, zero leads, test, reconnect. Reading obtained should be less than 0.05 ohms.