hi zs on ring final

[moose man]

done a dis board change at work in tool room ring final as a zs 0.51 ohms on sockets but there are 3 skts on same circuit with a reading of 1.67 K ohms got to have a look on monday any pointers line to line ok live to live ok they have used conduit as earth path there are 9 skts on circuit but 3 failed

thanks moose man

 

[NozSpark]

Could be that those 3 are spurred and have a dodgy connection...

Did you do your ring continuity and fig8 tests??

It should have showed up then!

 

[Manator]

This sometimes happens when the steel conduit is used as the earth, each joint should be inspected for any failure, one cause is the connections to the back boxes, and the fly lead connections. If its sometimes a pain to find, which is why an earth is run inside the conduit if its an easy run.

 

[moose man]

not yet ring continuity was ok didnt do fig 8 got to do that on monday but bit hard to do cpc as they have used conduit as the earth path. At to power board up ready for production on monday but left ring dissconected pending further investing

whoudent mind but we have had a pir done and they didnt pick that fault up had A Look on test results and there is no ring final tests been done

 

[batty]

I think this is problem when some people do pir's because they don't test everything think you can do a percentage so if the ones you do are ok you may miss faulty ones which has probably happened on this. I would think its a bad join at a point which you should be able to find. I personally think a cpc in conduits is better then this should not happen. All conduit and steel work I have done have always added a cpc so as not to really on steel as cpc.

 

[moose man]

This sometimes happens when the steel conduit is used as the earth, each joint should be inspected for any failure, one cause is the connections to the back boxes, and the fly lead connections. If its sometimes a pain to find, which is why an earth is run inside the conduit if its an easy run.

its not an easy run its 30+yrs when factory there is a earth there when tested between line &cpc 230v but like you said it might be poor will get up on to flat roof on monday but its like a maze up there typical old factory

---------- Post Auto-Merged at 17:05 ---------- Previous post was made at 16:59 ----------

I think this is problem when some people do pir's because they don't test everything think you can do a percentage so if the ones you do are ok you may miss faulty ones which has probably happened on this. I would think its a bad join at a point which you should be able to find. I personally think a cpc in conduits is better then this should not happen. All conduit and steel work I have done have always added a cpc so as not to really on steel as cpc.

they should have done a 100% pir because we didnt have any previous test results had this done before i got my 2391 cert and

it cost the company

 

[nsbs]

You base the inspection on the type and age of the installation. GN3 sates that judgement is based upon the availability of previous reports, MW certs, EIC, engineering reports, drawings etc and if these are not available a higher % up to 100% should be inspected, however every circuit should be tested under the scope of the inspection. (This technique is called sampling) However, it also realises that there are commercial decisions to be made, and nature of the inspection should be made in conjunction with the client. E.G. I am undertaking a PIR on a industrial premises with around 1200 circuits, as I cant shut the premises down for the length of time it would take me to test all the circuits, I have agreed with the client and the insurers to I&T 300 circuits per year on a 4 year rolling programme. The only pain is that it needs to be done over a 2-week period in the summer, and its not always easy to test 300 circuits in 2 weeks

 

[ian932]

Could it be the faceplate that is faulty? sometimes if I get a high reading I flick the socket switch on and off several times to work the switch contacts, if it

 

[moose man]

i did that ian932 and got same result as with the plug in lead that as my first thought

 

[ian932]

i did that ian932 and got same result as with the plug in lead that as my first thought

Very likely the earth path then on those points.

 

[moose man]

i look at that first think . upset toolroom personal wont be able to listen to radio 2 or saga