Ze Values? HELP

[Underpaid]

As a guide in the 17th the max Ze readings for the following =
Tns = 0.8
Tncs = 0.35
TT = 200

I Recently got a Ze reading of 0.15 on a Tns system, as its higher than 0.8 in the 17th should i be worried?
If its ok, what Ze readings would you consider high for each of the systems? e.g time to call the DNO.
Also filling out a certificate with a higher Ze reading than recommended in bs7671, allowed?

 

[Paul.M]

0.15 is not higher than 0.80 if you look at it that way

 

[telectrix]

As a guide in the 17th the max Ze readings for the following =
Tns = 0.8
Tncs = 0.35
TT = 200

I Recently got a Ze reading of 0.15 on a Tns system, as its higher than 0.8 in the 17th should i be worried?
If its ok, what Ze readings would you consider high for each of the systems? e.g time to call the DNO.
Also filling out a certificate with a higher Ze reading than recommended in bs7671, allowed?

with maths like that, you'll never make a scouse wheel thief. you'd nick1 and say it was more than 4!

 

[Leesparkykent]

Oh dear lol.

 

[Spoon]

Give the OP a break, most prob a brain fart moment....

 

[Leesparkykent]

Give the OP a break, most prob a brain fart moment....

Thats 1 big brain fart....

 

[telectrix]

fart?..... follow through, more like.

 

[Paul.M]

Give the OP a break, most prob a brain fart moment....

Agree, thats why I pointed out the magical 2nd decimal place.

 

[davesparks]

Good grief!

Where exactly on BS7671 did you get that lot from?

There is no guideline maximum for Ze on a TT system, and if there was it's hardly going to be 200ohms is it!
Oh and 80 is higher than 15!

 

[Farmelectrics]

school boy error lol

 

[Underpaid]

page 11 onsite guide.

 

[Underpaid]

am new to testing so am sure i will make mistake, thats why i joined this site to get help from experienced electricians not to be bullied

 

[Underpaid]

well all i can say is the onsite guide should write it as 0.80, thanks tho that makes alot more sense than the regs

 

[ian.settle1]

As a guide in the 17th the max Ze readings for the following =
Tns = 0.8
Tncs = 0.35
TT = 200

I Recently got a Ze reading of 0.15 on a Tns system, as its higher than 0.8 in the 17th should i be worried?
If its ok, what Ze readings would you consider high for each of the systems? e.g time to call the DNO.
Also filling out a certificate with a higher Ze reading than recommended in bs7671, allowed?

Stop making out that scousers are thick

 

[Paul.M]

Ok the OP is not that good at maths, give him a break for a simple mistake. He now knows.

 

[Underpaid]

Now that ive been given the answer, the question i asked does sound dumb.

 

[LeeH]

Now that ive been given the answer, the question i asked does sound dumb.

That's one ironic username.

 

[trev]

am new to testing so am sure i will make mistake, thats why i joined this site to get help from experienced electricians not to be bullied

Mate, you haven't been bullied. Yet

 

[telectrix]

only a bit of banter so far.

 

[PEG]

Hi,dude, You will have to grow a sense of humour,as you have only had 20% of the 100% normally given,which is,after all,only one seventh....:conehead:

 

[davesparks]

well all i can say is the onsite guide should write it as 0.80, thanks tho that makes alot more sense than the regs

Why should the write it as. 0.80 if they mean 0.8? The numerical value is the same but the implied accuracy is not, 0.80 implies greater accuracy than value than 0.8

 

[shanky887614]

with maths like that, you'll never make a scouse wheel thief. you'd nick1 and say it was more than 4!

0.15 is not higher than 0.80 if you look at it that way

fart?..... follow through, more like.

Thats 1 big brain fart....

i think the op is overpaid rather than his namesake

 

[shanky887614]

Stop making out that scousers are thick

no need, you scousers don't need a helping hand to prove that to the rest of us

 

[newtothis]

0.80 implies greater accuracy than value than 0.8

Could it be that it was 0.8 exactly, with the zero dropped as it would be irrelevant, to the outcome calcs.
Sorry I'm trying to get my head around this, not disrespecting your post.

 

[7029 dave]

am new to testing so am sure i will make mistake, thats why i joined this site to get help from experienced electricians not to be bullied

Welcome along, you will find this site extremely useful, just banter nothing else enjoy it.

 

[davesparks]

Could it be that it was 0.8 exactly, with the zero dropped as it would be irrelevant, to the outcome calcs.
Sorry I'm trying to get my head around this, not disrespecting your post.

The zero is relevant to the outcome of the calculation as it will have an impact on its accuracy.
0.8 x 0.320 = 0.3
0.80 x 0.320 = 0.26
0.800 x 0.320 = 0.256

0.8 is a value anywhere between 0.75 and 0.84 wheras 0.80 is a value between 0.795 and 0.804

 

[PEG]

The zero is relevant to the outcome of the calculation as it will have an impact on its accuracy.
0.8 x 0.320 = 0.3
0.80 x 0.320 = 0.26
0.800 x 0.320 = 0.256

0.8 is a value anywhere between 0.75 and 0.84 wheras 0.80 is a value between 0.795 and 0.804

...Your calculator needs re-calibrating...:icon12:

 

[davesparks]

...Your calculator needs re-calibrating...:icon12:

ok, so this is the second version of my reply after noticing the wink at the end of that, this version being far more polite

 

[Paul.M]

Could it be that it was 0.8 exactly, with the zero dropped as it would be irrelevant, to the outcome calcs.
Sorry I'm trying to get my head around this, not disrespecting your post.

Yes mate. If the 2nd, 3rd 4th etc decimal place is not required, dont need to use it or it would become 0.800000 or 0.8 X 10 to the power of minus 6 (level 3 maths, you will see)

^^ that is correct isn't it gents? Been a long time since writing this form of equation and it does not look right?

 

[Des 56]

This is getting too in depth,anyone know if my maths are right,I seem to keep getting e=mc squared