Testing problems need a little help.

[kes123]

The reading is yes 2.35 ohms. So if it is so high what could be wrong

 

[flukey]

what earthing system have you got??

 

[telectrix]

The reading is yes 2.35 ohms. So if it is so high what could be wrong

if its a TN system, then it's the DNO's problem. if it's TT then 2.35ohms is good.

 

[malcolmsanford]

I know and it remained unanswered, sorry for trying to help.

Cheers mate .....................

 

[kes123]

Hi the system is TNS. i am presuming that because there are two cables coming in from outside

 

[flukey]

if you dont know the difference between earthing systems then i would advise putting the tester down for a while and swotting up on the basics for safety sake

 

[mart8235]

Hi the system is TNS. i am presuming that
because there are two cables coming in from outside

what are those 2 cables? L & N? where does the earth cable go to? can you trace it? to an earth rod maybe?

 

[kes123]

I know the differences but its not easy to spot it on an old system like mine.

Experience is what counts and knowledge. knowledge I can get from reading, but the experience can only come through using the tester, as long as its done in a safe manor

 

[flukey]

so far you have told us that you cant identify the system you are working on, you have struggled with the setting to put the meter on, you have also struggled with where to connect your probes.

i would strongly advise to gain the knowledge before carrying out what is a potentially very dangerous testing exercise in the wrong hands

experience will follow once you understand exactly what it is you are doing and what sort of readings to expect

 

[kes123]

If only life was that easy.
Its like reading about the internal combustion engine, it really only makes sense actually seeing it.
Its like I said I am not an experienced tester. I am one who is trying to learn. Books that i read do contridict each other as do sometimes advice given on this forum.

But whatever I may do wrong I will do in a wrong safe way.

 

[Des 56]

Kes
I admire your determination to carry out these tests
I am sorry to say but after reading the thread, at the moment you do not appear to be completely sure what the readings you are getting mean, or what they are relevant too
You are unsure of the system type and you are live testing at source

These tests can be dangerous if not carried out correctly, as you know

Other testing,such as dead testing, after proving dead, would make you more familiar with the instrument and procedures

You may be wise to curtail the live tests for the time being, concentrate on the testing theory and getting to know your machine

When you feel confident of doing these live tests,arrange a session with an experienced person initially
It will benefit you more than stumbling along for the time being
I intend this advise, not as a put down to you,but with your improvement in testing in mind

 

[kes123]

Thanks and I understand what you are saying. I have done and passed a 2392 course but the knowledge soon starts to fade unfortunately.
I will keep reading and i will try to avoid live testing at present unless its done through a socket using the adapter.
And thanks for giving the help that In have got

 

[flukey]

Thanks and I understand what you are saying. I have done and passed a 2392 course but the knowledge soon starts to fade unfortunately.
I will keep reading and i will try to avoid live testing at present unless its done through a socket using the adapter.
And thanks for giving the help that In have got

now the alarm bells are really ringing!!!!!!!!

 

[DaveyD]

Kes, get a picture of the incomming up.

 

[malcolmsanford]

Can we please clarify, when you say the consumer unit is protected by, do you mean the main incommer in the consumer unit is an 100A RCD or is there an RCD between the meter and CU?

Whenever you are testing Ze your whole circuit side of your CU should be off as you've disconnected the main earth for the whole installation! So the only thing that should be live in the CU is the supply side to your main incommer.

Ok now I am really confused. the consumer unit is protected by a 100amp rcd.

I am connecting green probe to earth. the red probe to the rdc should this be the live side of the rdc then not the dead side.
my megger is just flashing 55

Kes
I admire your determination to carry out these tests
I am sorry to say but after reading the thread, at the moment you do not appear to be completely sure what the readings you are getting mean, or what they are relevant too
You are unsure of the system type and you are live testing at source

These tests can be dangerous if not carried out correctly, as you know

Other testing,such as dead testing, after proving dead, would make you more familiar with the instrument and procedures

You may be wise to curtail the live tests for the time being, concentrate on the testing theory and getting to know your machine

When you feel confident of doing these live tests,arrange a session with an experienced person initially
It will benefit you more than stumbling along for the time being
I intend this advise, not as a put down to you,but with your improvement in testing in mind

Kes you would do well to heed Des advise mate as in all the posts I've seen from him I never known him to far off the mark and that was very very good advice ......................

I understand your desire to learn and I think like me Des was the old school where we had guidance of electricians who made sure we never came to harm when doing this type of things, well I say harm I don't include the occasional rap over the knuckles if I was going to do something stupid ..............

Unfortuantely the younger sparks don't have this safety net, of an older hand to guide them, and that is where people like Des and this forum is a god send to you guys. Never be afraid to ask us on here, and if your not sure ask again, as my old sparks told me year ago

"Son when I hang these overalls up at night, they no more about electrics than you", which I was reminded of just a while ago.