Discuss Testing.. Never goes right.. in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

Welcome to ElectriciansForums.net - The American Electrical Advice Forum
Head straight to the main forums to chat by click here:   American Electrical Advice Forum

T

TPES

Practicing again...

TN-CS Supply New Built Home

Tested ring final circuit..

P - 0.34
N - 0.34
CPC - 0.59
________________________________________________

N1 - P2 = 0.70

N1 - P2
P1 - N2 = 0.16

P - N Sockets..
1- 0.19
2- 0.16
3- 0.17
4- 0.17
5- 0.18
6- 0.16
7- 0.21
8-
9- 0.18
________________________________________________

P1 - CPC2 = 0.95

CPC1 - P2
P1 - CPC2 = 0.21

P-CPC...
1- 0.23
2- 0.22
3- 0.26
4- 0.22
5- 0.23
6- 0.30 ? Why the high readings on socket 6/7/9..?? really annoys me.. No test i do ever goes right.
7- 0.36 ?
8-
9- 0.30
________________________________________________

Socket "8" was not accessible.. What do you do about this.. What would you write about this on Cert?
________________________________________________

Ze = 0.21
PFC = 1.23 kA
________________________________________________

IR Test..

L-N >1000
L-E >1000
N -E >1000
________________________________________________

Does all look ok ???​
 
Looks ok to me.

Its usually the case that the higher readings are normally spurs.

Should have similar readings wherever on the RFC.

How come socket 8 was not accessible?

Still, a note on the cert wont hurt.
 
Last edited by a moderator:
Your to keen!!!!!! If you have not wired it .... it's not your problem !!!!!!
Are ELI readings at each socket within limits ?
With it being new build !!!! These readings don't matter....If the Rcd trip times are within range at each outlet....... if you read the contradicting ECA guide to the Regs
 
Just because a circuit has RCD protection it does not negate the need for max permitted Zs values to be met.

There seems to be a bit of a culture brewing that if theres an RCD on the circuit then forget about the Zs, not the case in my book.
 
Agreed Len,

RCD's should ONLY be used if max disconnections times cannot be met, not instead of.

Obviously except in the case of TT's.
 
I know i am very keen, and this is sad i suppose but lately all i can think about is testing.. and all the tests and results.

This is why its frustrating me when im getting readdings off like this..
would you all be investigating these slightly higher readings on sockets 6/7/9 or just put down your R1+R2 as 0.36 being the highest. (even though the readings are out the 0.05 limit between sockets)
 
are you using a plug in tester ,if so use the probes were the cables terminate the sockets as the tightness of the plug can varrie from socket to socket
 
are you using a plug in tester ,if so use the probes were the cables terminate the sockets as the tightness of the plug can varrie from socket to socket


So you suggest to take the socket off and test with the probes on terminations not the (R1+R2) socket tester?
 
Ideally yes, because sometimes contacts in the sockets wear etc and can give odd readings.

Shoving the plug in and out a few times may help.

Would be interesting to see your results with the 3 wire method.
 
sid
you will find as you do more testing that the readings often vary a little from what you would expect its a case of learning what is an acceptable difference not every circ will be spot on by the book
 
sid
you will find as you do more testing that the readings often vary a little from what you would expect its a case of learning what is an acceptable difference not every circ will be spot on by the book


Ok, I had done a test today on a ring main in a farm house.

I had readings between sockets from 0.28 to 0.36, this is obviously out of the allowed 0.05. Theres no spurs.

Would you say this is acceptable although its not "by the book" and happily record down your r1+r2 as 0.36 ?
 
Magic the 0.05 ohms figure is a rule of thumb i use before hunting its not in the book!!. As spread of figures is only 0.08 ohms of a difference then i would recon its ok. However its only going by figues you have given.
There are meny reasond for this spread of reading such worn contaacts if your usin a plug to take loops, Diffrences in connections if you are using probes.
As Jason,Mark has already said its experiance that will tell you these things and if you should go hunting. Thing to take into account are age,usage ect if its 6 year old building getting its first periodic i would say its fine no worries but if its a 50 year old building showing sighns of wear have a think. It could be corrosion in terminals have a GOOD hunt. On older buildings be carefull!!
 
Cheers for your replys.. appreciate it..

Also i cant find max Ze for different earthing arangements in the red book.. anyone point me in the right direction?
 
TNCS - 0.35
TNS - 0.8
TT - 1667 although 200 is acceptable but it could be unstable and so should ideally be under 100.

Page 11 OSG
 
Last edited by a moderator:

Reply to Testing.. Never goes right.. in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc
This website was designed, optimised and is hosted by Untold Media. Operating under the name Untold Media since 2001.
Back
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock