Zs on TT

[i=p/u]

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 .

 

[Badged01]

What is the point in carrying out zs on TT system other than verifying a loop.

Unsure whether this is a wind up or you just dont know what Zs is for ......

 

[i=p/u]

What I'm saying the main switch will always trip b4 any breaker...

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As it's an rcd

 

[Billythekid]

What I'm saying the main switch will always trip b4 any breaker...

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As it's an rcd

And if the RCD fails to operate?

 

[ipf]

What I'm saying the main switch will always trip b4 any breaker...

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As it's an rcd

What about overload.......come on !!!

 

[DPG]

This should be an interesting thread. Daz

 

[MDJ]

Yes I was just thinking the same Daz LOL

 

[i=p/u]

Well forget overload , yous going off in your own tangent.

 

[Simonslimline]

If you didn't measure it then how would you know what the reading would be?

 

[Badged01]

If you didn't measure it then how would you know what the reading would be?

And what value would be acceptable ......

 

[i=p/u]

The rcd main switch is going to trip on fault current even before the mcb reach full operating current. So the trip times arnt met. Geeees are yous on the ale everyday.

 

[i=p/u]

On a TT system we rely on rcd as disconnection times arnt always met..

 

[Badged01]

Geeees are yous on the ale everyday.

Only on the days after I draw the dole ......

 

[ipf]

Well forget overload , yous going off in your own tangent.

:biggrinjester: Bit for that one. Getting on to trig now, are we ?

 

[Badged01]

:biggrinjester: Bit for that one. Getting on to trig now, are we ?

Nope. Thinks he's talking more scalar than vector .....

 

[i=p/u]

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

 

[i=p/u]

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,

 

[JD6400]

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

No offence meant fella , but that did make me laugh !

 

[i=p/u]

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

 

[i=p/u]

I'm whistling the wife to be , yous e buddies arnt with it the night.

 

[telectrix]

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).

 

[Badged01]

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

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 .....

 

[DPG]

I'm whistling the wife to be , yous e buddies arnt with it the night.

I agree. Whatever it means Daz

 

[JD6400]

Me !:38:, Me no speaky English , me no commit to big can of whoopass !!!!
But having said that , I think I can understand what you trying to say !?

 

[i=p/u]

Your all mad or i alone is, I know who il bet on

 

[Badged01]

.... you need to measure the Zs to ensure that it's below 1667 ohms ( 30mA RCD) or 500ohms (100mA RCD).

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:

 

[i=p/u]

No Celt , British and proud .. North of the border , love the queen and orange order))

 

[telectrix]

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:

 

[i=p/u]

I just can't believe it...

 

[44ALLAN]

 

[Lucien Nunes]

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.

 

[Marvo]

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

 

[JD6400]

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

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

Edit; According to another thread at the moment that is !

 

[Marvo]

Lol, sorry, I forgot about the gay thing. You have to admit though this thread is damn funny....

 

[JD6400]

I am meant to be " up stairs " but I am weighing it up at the moment , as I may miss the show tonight !

 

[Des 56]

Lol, sorry, I forgot about the gay thing. You have to admit though this thread is damn funny....

That last thread confirmed only the English as gay,we can rest easy:hurray:

 

[Engineer54]

I'm just lost for words!!

An Ra of 14 ohms and Zs of 1.9 ohms, .....Yep why bother testing??

 

[GLENNSPARK]

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.....

 

[i=p/u]

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?

 

[i=p/u]

I'm just lost for words!!

An Ra of 14 ohms and Zs of 1.9 ohms, .....Yep why bother testing??

You are relying on rcd on a TT for fault protection or not.... I think I've worded this all wrong. Help me out.