What is the name of the fault when main bonding high resistance?

[glasgospark]

because it is C1 - no continuity on MPBC. The resistance over 2 ohms on MPBC the cable is f ... d and is not able to accomodate fault current flow into safety

- - - Updated - - -

i bet you make a fortune doing eicr and classing everything in site a C1

obviously someone shouldnt be doing EICR'S in here wink wink nudge nudge

 

[Silly Sausage]

I was with someone once who was dishing out old code 2s on RFCs with 20A breakers!
Must've been on company orders to generate the remedials!

 

[glasgospark]

it usually is , companies going in bottom dollar and finding loads to fix ,

 

[Silly Sausage]

I took over the job about halfway through (a hotel) and didn't code the rest.
Strangely I didn't get any more work off them. Coincidence???

 

[glasgospark]

haha profit must have delined dramatically half way through

 

[Des 56]

konrad
C1 Danger present,immediate risk of injury


Without any means of earthing there will always be a potential danger,but it won't an be "immediate" risk of injury
A system can function for eons without an earth and the danger is always only potential

For it to be immediate there has to be direct risk at that moment,you can shove your fingers on a live bare conductor for instance,the earthing is very important but not a life threatening present condition

 

[IQ Electrical]

Yes, The continuity of main bonding to water was higher than 0.05. About 2.2 ohm. And the length of cpc is not longer than 2 meters.

Thanks

Just thought I'd better mention that there is no upper limit on main protective bonding conductor resistance values.....
Obviously the lower the better and in the scenario that you describe, there is certainly a fault but there is no 0.05 Ohm limit.

 

[Eggster71]

Just thought I'd better mention that there is no upper limit on main protective bonding conductor resistance values.....
Obviously the lower the better and in the scenario that you describe, there is certainly a fault but there is no 0.05 Ohm limit.

The firm I'm subbing to insist on 0.05, calculated from potential touch voltage, I have asked them to confirm this, and where the formula is and they go "a bit vague" on me....they tend to be a bit "monkey see...monkey do". Unless it's the supplementary bonding formula...415.2.2...

 

[IQ Electrical]

The firm I'm subbing to insist on 0.05, calculated from potential touch voltage, I have asked them to confirm this, and where the formula is and they go "a bit vague" on me....they tend to be a bit "monkey see...monkey do". Unless it's the supplementary bonding formula...415.2.2...

Yes, the passage reads like this:

This method can also be used to confirm a bonding connection between extraneous-conductive parts where it is not possible to see a bonding connection, e.g. where bonding
clamps have been ‘built in’. The test would be done by connecting the leads of the
instrument between any two points such as metallic pipes and looking for a low reading
of the order of 0.05 Ω

I've highlighted the key words-'between extraneous-conductive parts'

 

[Rampantchilli]

So, if it has no continuity how does the OP get a value of 2.2ohms? Surely it's just got a high resistance value but is still continuous?

as for Konrads rant, he lost me, when did this become a matter of surge protection?

 

[IQ Electrical]

So, if it has no continuity how does the OP get a value of 2.2ohms? Surely it's just got a high resistance value but is still continuous?

as for Konrads rant, he lost me, when did this become a matter of surge protection?

You're right-I'm not sure the OP was carrying out the test procedure correctly-if you have a MPB conductor length of 2 Metres as he states and a reading of 2.2 Ohms then surely the fault isn't too hard to find?