New to testing... Ze, PSCC & PEFC

[kung]

Dont worry its easily done at the start at least your doing it right not the pub diy bloke way !

 

[Guest123]

 

[TPES]

Because ive read in a number of places that Max Ze is..

TNCS = 0.35
TNS = 0.8
TT = 20

So because TNS is 0.8 as wrote and not 0.80,
This was why im thinking i have to get it lower than 0.8

 

[kung]

lol cool !

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.

tut tut and wheres your safe isolation ? (switch off and lock off) etc etc ?

 

[TPES]

Right, Heres my second go..

This is a TNCS, Better photos..

I know its a peice of cake to most of you but have i sussed it?

I lost my green crock clip, thats why using black one..

(And yes I do like creme eggs!!)

 

[Spudnik]

Right, Heres my second go..

This is a TNCS, Better photos..

.... have i sussed it?

Correctamondo!!

 

[Guest123]

Spot on mate.

 

[TPES]

Good Good!

So on EIC..

I put in the "External Earth Fault Loop Impedance Ze" = 0.20
& For my "Prospective Fault Current" from my readings what would you put in the "kA" Box ???

 

[Spudnik]

Good Good!

So on EIC..

I put in the "External Earth Fault Loop Impedance Ze" = 0.20
& For my "Prospective Fault Current" from my readings what would you put in the "kA" Box ???

Yep and the PFC box you put your highest value of PEFC or PSCC which is 1.01.

Odd though as normally on a TNCS they are near enough the same, but dont worry about that for now!

 

[TPES]

So from my readings you'd put in "1 kA"

and the maximum this can be is 16.5kA, Is this correct?... and this will be written in the "Short Circuit Capacity" Box on the EIC?

 

[Spudnik]

What certs are you using?

 

[TPES]

What certs are you using?

NIC EIC..

Domestic Electrical Installation Certificate

 

[Spudnik]

So from my readings you'd put in "1 kA"

and the maximum this can be is 16.5kA, Is this correct?... and this will be written in the "Short Circuit Capacity" Box on the EIC?

Ok Nature of Supply etc.

External EFLI Ze is the max so for TNCS its .35 There is then a box underneath for Measured Ze

PFC Single phase is what you measure so 1.01kA

Short Circuit Capacity is normaly 33kA for BS 1361 Type II 100A fuse.

 

[TPES]

Ok thanks J.. I dont know where ive got 16.5 from, ive seen it the max for something.

Where in the red book would i find these figures?

 

[Spudnik]

It is the max for some fuse types.


Have a look in the OSG Page 57