ringmain testing

[sparkie-leeds]

Hi,

I have just tested an existing ringmain starting with the line conductor reading 0.32 and the neutral reading 0.87, these are both in 2.5 twin and earth, can someone explain why there is a big difference in the 2 readings when the conductors are the same size?

 

[GLENNSPARK]

so its an EICR is it?....if so then you cant sample on this circuit.....check all points served.....including any joint boxes.....
while your at it...make a note of any stuff like neons etc that will throw up silly IR readings later on.....unless you just test live to earth that is....

 

[harrod58]

The joys of being a spark ! lol

 

[dagrat]

Don't forget that this is an existing installation, so the fact that r2 is lower than the r1 is understandable and most probably due to existing parallel earth paths. The r1 reading equates to approx 40-45 metres, so check if this is right.
although the rn reading is high and does suggest loose connections.

 

[AP Electrical]

Don't forget that this is an existing installation, so the fact that r2 is lower than the r1 is understandable and most probably due to existing parallel earth paths. The r1 reading equates to approx 40-45 metres, so check if this is right.
although the rn reading is high and does suggest loose connections.

He's not put the r2 figure, just r1 and rn.

also shouldn't be any parallel paths on an end to end cpc test.

 

[dagrat]

I think on post 4 he states r2 is .28, although I'm presuming its r2 because he actually wrote " R2"

 

[AP Electrical]

I think on post 4 he states r2 is .28, although I'm presuming its r2 because he actually wrote " R2"

My bad dagrat, missed it altogether.....:blush2:

 

[dagrat]

No problem mate.
Incedenly, existing installations even though the loads are disconnected, the cpcs,s are still continuous and can often find parallel earth paths within the installation.

 

[GLENNSPARK]

its a ringmain as i did end to end continuity, with the conductor been the same size surely the readings would be the same more or less

er...NO!!.....its a ring final......