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: