Discuss continuity in the UK Electrical Forum area at ElectriciansForums.net
Cables in con unit suggest bonding to gas and water.but I can't find connection..is there a way i can I test for it
Wasn't a reply when I hit post. Consider entry retractedOverskilled that is what Richard pointed out even doing a R2 test there is a good chance that you will get some sort of reading if there is metal work throughout the installation, by picking up parallel paths.
If you don't get a reading of any kind then I would do an IR test with the MET to confirm that there is no potential
Agree with this 100%Not with surety.
All you can say is that the connections are not available for testing (however they should be available for testing, but are often boxed in)
Even if you test continuity from the MET to the nearest point of entry of the metallic service you will very likely get a low reading as there will be interconnections from boilers, etc that will give a low reading so it cannot be proved there is bonding present without being able to test the end to end continuity of the bonding cable.
However if you test continuity and you get a high reading then you can almost certainly say there is no bonding or it not connected.
Not with surety.
All you can say is that the connections are not available for testing (however they should be available for testing, but are often boxed in)
Even if you test continuity from the MET to the nearest point of entry of the metallic service you will very likely get a low reading as there will be interconnections from boilers, etc that will give a low reading so it cannot be proved there is bonding present without being able to test the end to end continuity of the bonding cable.
However if you test continuity and you get a high reading then you can almost certainly say there is no bonding or it not connected.
Would you ever use the 0.05Ω suggestion Richard in GN3 to confirm a bonding connection if the bonding clamps are unable to be found?
That figure is suggested for the resistance of the connection to the part being bonded only, not the bonding cable. Ie you test between the cable terminal of the earthing clamp and the pipe it is attached to and this should have minimal resistance with 0.05 being the suggested guideline maximum
sorry pete, dave is correct.
GN3 only suggests that the resistance of a main bonding conductor should be in the order of 0.05Ω, however this is patently incorrect as I have measured bonding conductors reading 0.00Ω on my meter!Would you ever use the 0.05Ω suggestion Richard in GN3 to confirm a bonding connection if the bonding clamps are unable to be found?
Not with surety.
All you can say is that the connections are not available for testing (however they should be available for testing, but are often boxed in)
Even if you test continuity from the MET to the nearest point of entry of the metallic service you will very likely get a low reading as there will be interconnections from boilers, etc that will give a low reading so it cannot be proved there is bonding present without being able to test the end to end continuity of the bonding cable.
However if you test continuity and you get a high reading then you can almost certainly say there is no bonding or it not connected.
Whats wrong with powering down and disconnecting the bonding conductors from the MET, then measuring to the gas / water pipe where accessible?
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