All, evening to you. I’ve started using electraform for doing certs. Doing an EICS and in the test results part there is a column next to measured Zs marked measured kA. I might be being special, but I’m not sure what I’d put in here for each circuit. Looking at my spare manually completed...
I was recently at a job and had a discussion with another Electrician regards a high Zs reading on a ring final circuit.
R1+R2 measured 1.68ohm
This puts the circuit over the permitted zs. I begun seeking out the issue.
However the other electrican said...
i have been filling in NICEIC certs now for the past two months
the way our firm work is to give out what they call a site sheet we test and fill in the results and all the information and then the QS looks over it and finalises it, I was given a completed cert fully printed out from our...
I am hoping someone can clarify if my understanding on earth fault loop impedance testing is correct.
A low efli is needed so a protective decive can operate in the required time, the lower the z the quicker it will operate.
ZE= External resistance from borad to supply, board...
hello, i got this qustion and would like someone to show me the working out of it please.
the measured value of loop impedance for a circuit is 0.83 ohms. if the temperature at the time of the test was 20c and the cable is 70c (factor1.2), what is the correct value. ze = 0.4 ohms
I was measuring Zs on a lighting circuit some time ago. First I did R1+R2 and it was around 1.60, pretty high but there were a few connections on the way and most of the cable was 1.0mm. Ze measured at the CU was low about 0.10 only, so Zs altogether around 1.70. When I measured it using...
Hi all need some advice when filling out test results on eicr's after carrying out live zs tests do you leave out R1 R2 column as in a lot of cases the measured reading is below ze value do you just make a note that it is a measurement and not a calculation?
any help appreciated
Have been called to a recently installed installation. Customer noticed one of the GLS BC LED lamps was glowing when turned off. Here are the facts:
Circuit tested - all tests appear normal.
Wired with feeds at the switch.
All lamps are LED
Measured voltage when lights switched on is...
Do you agree that we only should be working dead when establishing the Zs for final circuits other than socket outlet circuits? That is, don't use the line, neutral and earth probes of the E/L tester except for Ze and Ipsc. Simply add R1+R2 to Ze.
I have my part p assesment in about 4 weeks. I have a kewtech kt61, it does everything i need it to apart from pscc. Will i be required to perform a manual pscc test or will calculating it be acceptable? As my tester doesnt do it. Thanks
I must be confused about some wording,
Light circuit R1+R2 is 1.84 Ze measured = 0.28
So if I do Ze +(R1+R2) I get 2.06
Maximum Zs allowed is 6.14
actual measured Zs is 0.88
This measured Zs is much lower than the max value, I know higher is not good but lower Zs leads to any problems ??
on a tn system, 238vs, would the disconnection time be 0.4s or 0.2s, i thought as over 230vs it should be 0.2s, but working with another engineer who disdagreed & pointed out tables in bs7671 show 0.4s to 5s?
Also when completing certs should you include the 80% or not in the maximum...
We measured PSCC on a three phase dist board in a commercial establishment. This board is fed from a main switch board with a main 400Amp switchfuse with BS88-2 fuses rated at 88kA. Feeding a second 160Amp switchfuse with BS88-2 fuses protecting the cabling to the board we were...
Looking around for gu10 led replacements. Obviously I know that ebay can hardly be described as a recognised distributor but they do have many sellers of and a wide variety of led lights. Apart from the normal worries about buying from such an 'outlet', I am concerned that the lumens figures...
two lighting circuit, one upstairs one down stairs, both on serparate rcds when i test down stairs at the last light for zs not a problem, when i upstairs at the last light, just beeps but doesnt give me a zs, why is that?
After a bit of advice:
I am just doing a bit of home testing prior to starting my 2391 later this month, but have come across a couple of strange results. Measured the R1 and got 0.98, also got the same for the Rn so not a bad start, but got 1.95 for the R2. I tested it a few times as I...
Hi. This seems like a newbie question but please help.
Received the test results with an 'excessive earth loop impedance' on one final circuit. Circuit originates with a 32A MCB and serves 10 socket points. Wiring is 2x2.5mm live, 2x2.5mm cpc. Max Zs = 0.72 Ohm. r1 (line) = 1.68, rn (neutral) =...
am looking at the question and am a bet lost now on answering it.....
The maximum permissible values of earth fault loop impedance for three circuits are 1.44 Ω, 0.92 Ω and 7.67 Ω. If the measured values for these circuits are 1.25 Ω, 0.68 Ω and 6.22 Ω, determine if the measured values are...
Hi there... Couple of questions for you experts. Still learning.....:o
Been to a factory today... It has one main incoming board and 55 distributon boards scattered around there factory...
They asked me to fit/wire a couple of socket outlets under one dist board. Which only uses the...
i have a question on a shower circuit the ccu is a crabtree sb6000 type,tn-c-s system,100a main switch split load 6 way 4 protected by 80a 30mA rcd with shower 40a,cooker 32a not used,32a sockets for all house,16a old immersion circuit now used to supply 3 pir 500w...
Sorry to bring up an old post but im confused.
I have carried out tests on a kitchen ring final wired in 2.5mm/1.5mm T&E, results as follows:
r1=0.36 rn=0.34 r2=0.59
I then joined leg 1 of line conductor to leg 2 of cpc and leg 2 of line conductor to leg 1 of cpc and measured the R1+R2 at...