Zs on TT

i=p/u

i=p/u

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Arms
What is the point in carrying out zs on TT system other than verifying a loop.
We got an Ra of 14.8 but when all bonding is in place it comes down to 1.9 ohms for most circuits zs results. I just don't see the point if rcd protected .
 
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Your ever here the song , where's your head at , where's your head. I singing it.

did I not word the question right?? I know you English are slow, like uh hmmm errrr.



what is the point of zs test on a TT system with 100mA rcd an Ra of 14.1 ohms. . Think a 1A fuse might trip without help of rcd.

geeeeeeeezus
 
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I know I ain't the brightest spark, but I don't know how you can't get what I'm saying without going off about overload, irrelevant.

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Maybe answering my own question and yous all laughing ..

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Yehaaaaa

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Gonna have bottle of wine and forget this thread,
 
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i=p/u said:
I know I ain't the brightest spark, but I don't know how you can't get what I'm saying without going off about overload, irrelevant.

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Maybe answering my own question and yous all laughing ..

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Yehaaaaa
Click to expand...

No offence meant fella , but that did make me laugh !
 
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the point is that there are 3 points.............. one on each of your test leads. also, you need to measure the Zs to ensure that it's below 1667 ohms ( 30mA RCD) or 500ohms (100mA RCD).
 
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i=p/u said:
Do you understand what I'm saying?

again for the brain impaired.

what is point in zs test on TTsystem , that has 100mA rcd and Ra of 14 ohms
Click to expand...

And there was me proudly boasting on another thread that if the 'celt' boys came to England the electrical competency there would be hugely improved .....
 
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telectrix said:
.... you need to measure the Zs to ensure that it's below 1667 ohms ( 30mA RCD) or 500ohms (100mA RCD).
Click to expand...

Tel, dont be giving him solutions ....... tease it out a bit longer and make him think! Ooops, what am I saying, hes a "Celt" boy, supposedly electrican finest breed :wink_smile:
 
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all i can say is that they must have a stronger variety of weed in scotland than he's used to the irish stuff. :dupe:
 
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I was going to write a silly answer but I gave up because I couldn't make it as silly as the question. Can you rephrase?

I read it as: Why test Zs on a system where the Ze is much higher than the Zdb? Or maybe: 'Why test Zs when the results are going to be high but not too high.' Either way it's pretty wacky.
 
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This one is a serious contender for 'thread of the week' award, I've had tears rolling down my face whilst reading it.

I assume Mr I=PU is asking why is the Zs relevant if you know the Ra is good enough to meet the required earth impedance on its own without the assistance of parallel paths.

Okay, I'm going to let the English who apparently 'are slow' and allegedly 'on the ale' sort this one out ;)
 
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Marvo said:
This one is a serious contender for 'thread of the week' award, I've had tears rolling down my face whilst reading it.

I assume Mr I=PU is asking why is the Zs relevant if you know the Ra is good enough to meet the required earth impedance on its own without the assistance of parallel paths.

Okay, I'm going to let the English who apparently 'are slow' and allegedly 'on the ale' sort this one out ;)
Click to expand...

Don't forget that we are all apparently Gay as well ! :shocked3:

Edit; According to another thread at the moment that is !
 
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looks like i`v missed a few good opportunities this evening to have a go..

got called out to a faultfind which turned out to be several neutral-earth faults...

and yep....the RCD was tripping...

it aint now though.....;)
 
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No glen not have a good go, no no no , support what I am saying.

if you have ze of 14 ohms what is the point of doing zs test , as you know your readings are to high for protective device already.


Brains just ain't your friend last two days guys , AAA?
 
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i=p/u

i=p/u

Arms
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