Discuss Why Earth before IR testing? in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
Might not be a very good termination, judging by some I have seen,When you say the cpc / armour connected to earth are you just referring to swa cables and how would it not be connected to earth if glanded to a metal enclosure.
excellent explanation.However if there was a fault from a live conductor to another piece or earthed metal nearby the test from armour to live conductor woudl show as OK.
If the armour was connected to the earthing system then the short would be shown on the test result.
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Too right I'm confused. The question isn't specifically about SWA but taking that as an example, if there were a phase to armour fault that would be picked up even if the armour were not connected to earth.
Where on earth (no pun intended ) do you get these drawings from??However if there was a fault from a live conductor to another piece or earthed metal nearby the test from armour to live conductor woudl show as OK.
If the armour was connected to the earthing system then the short would be shown on the test result.
View attachment 41916
I draw them out, lines, shapes, connectors, etc.Where on earth (no pun intended ) do you get these drawings from??
As always. He's a dab hand with the concise words and internet crayons.excellent explanation.
I like crayons, the black ones taste the best...As always. He's a dab hand with the concise words and internet crayons.
OK,so if you expand this notion to any other cable,the reasons for earthing that particular conductor,during that particular test,are obvious.
Another reason,if one was needed,for earthing the armour on SWA during an IR test,would be that even if the armour only provided mechanical protection,an indication of it's integrity,that is to say,how the outer sheath may be providing prevention of moisture,rust,etc,in relation to the environment (earth) is also tested.
I still have not heard the counter debate,from the OP,of why the other side of this argument,feel it is not necessary...
I draw them out, lines, shapes, connectors, etc.
This one is a bit odd in that it was done quickly and it is hard to indicate a bonding strap on a pipe, but I should have just done another tube inset, nope that does not work either.
I now have a very odd library of very odd diagrams.
Unfortunately my skills with irrational objects, such as people, are not quite to the same level...
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I have just read this post and was so shocked I have had to put my Cider down and take a walk up the garden, I am in total shock to be honest, what on earth are they teaching you Kids these days, time to stick my head in a bucket of water, clearly the cider is making me confused lolA question for testers to settle a debate at work - GN3 & regulation 612.3.1 state that when doing insulation resistance, the CPC/armour of swa MUST be connected to Earth.
Does anyone know why this is please?
I have just read this post and was so shocked I have had to put my Cider down and take a walk up the garden, I am in total shock to be honest, what on earth are they teaching you Kids these days, time to stick my head in a bucket of water, clearly the cider is making me confused lolA question for testers to settle a debate at work - GN3 & regulation 612.3.1 state that when doing insulation resistance, the CPC/armour of swa MUST be connected to Earth.
Does anyone know why this is please?
Reply to Why Earth before IR testing? in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
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