New to testing... Ze, PSCC & PEFC

[TPES]

I am new to testing and im trying to learn all i can about each test.

Today i have been practicing my Ze tests, PSCC & PEFC.

Please can someone tell me if i am performing the tests the correct way and if my results look genuine?
(I have a feeling my results on this occasion are way out)

I have added photos.
(If i press the "Display" button on my tester i will also get a current reading. So 2 photos to each test)

My Ze seems very high, Unless im doing the test wrong. Its a TN-S Supply and i understand 0.8 is the maximum.

I appreciate any pointers.

Ignore these photos, I know now there wrong, I got it right further down the post.

 

[Spudnik]

Hi Sid,

You need to disconnect the main earth from the bar and then test.

With it in place you are introducing parallel paths via main bonds and this will result in inaccurate results.

 

[Guest123]

Hi.

Pic 3 appears to be your Ze as the ohm symbol is displayed on the meter.

J, the earth is disconnected just hard to make out.

 

[Spudnik]

Fair enough.

Im gonna stay out of this one because the way the leads are connected dont make sense to me, especially with the first pics as i dont use a MM.

And the pics arent very clear on my screen as i cant even make out any symbols on the meter!

 

[TPES]

If i have the leads connected wrong please tell me.

My meter wont give any reading at all if i dont connect the way shown in photos.
It will display the voltage untill i press "start" then give my readings.

 

[Guest123]

Using my multimeter (megger) I test as follows-

3 wire lead

Ze, main earth disconnected red-line, black-neutral, green-earth.
PSC, main earth reconnected red-line, black-neutral green-earth.

 

[Mr Mark Sparks]

i might be missing something but those readings look like a tt job to me if they are tns then something is wrong

 

[Guest123]

Mark, Have a close look at pic 3, I think this is his Ze as the test leads are connected to obtain Ze and the reading on the meter is in ohms and is about right for a Ze. He has it labelled as PEFC but it cant be.

Whats your view on it.

 

[TPES]

i might be missing something but those readings look like a tt job to me if they are tns then something is wrong

Yeah it is TNS, I know these are very odd readings, Not sure why? What would be the cause of these high readings? Should i get intouch with the suppliers?

 

[Mr Mark Sparks]

lenny i have mft 1552 and cant see what scale hes on but agree leads connected for ze

 

[TPES]

On picture 3 my tester is set to "PSC L-N" this is what it says on meter for this setting, So i assumed this would be for my PSCC. Giving me the reading it does.

If I have tested wrong and Picture 3 is my Ze reading, Is it not above the maximum for a TNS, (being 0.8) ?

 

[kung]

Using my multimeter (megger) I test as follows-

3 wire lead

Ze, main earth disconnected red-line, black-neutral, green-earth.
PSC, main earth reconnected red-line, black-neutral green-earth.

Agreed ! didnt understand the reasoning behind ze with only cpc discon and crocked fine but n on line well and no line
Ze discon main cpc then crock using the 3 lead then n & l
pefc main cpc connected and crock cpc bar then l & n etc
pssc connect the earth probe to the n making it into a two wire tester and go between l-n.
Pfc is the highest reading taken from the two pfc readings between pefc & pssc.
Thought i was going mad

 

[TPES]

I think i can see what ive done wrong now.. What a plonker!

Still my readings are above the maximum for Ze??

 

[Guest123]

When I was in school 0.32 was lower than 0.80

 

[TPES]

When I was in school 0.32 was lower than 0.80

Ha ha ha, slap me!