Hi ther
I'm fitting a new IKEA kitchen for my father and have insta Ed a new cooker switch. When testing with cooker breaker off I was sill seeing 9.6v on my multimeter. As I individually switched other breakers off I saw the voltage decrease witheach breaker till i switched off the main...
Hi knowledgeable collective.
To the chase. TN-S Megger 1553
2 wire Ze 0.09 but was getting Zs on cooker cable 1.5 metre long using No trip 3 wire got 33.4ohms So went back through system right to isolator post meter and was still getting 33 ohm reading. So 2 wire uses higher current so might...
Hello while 255V seems to be a normal voltage for low voltage networks it causes issues to my solar installation where the inverter works up to 240V.
Any idea why Western Power increased the voltage?
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...
Good morning,
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
Ze 0.18
Tncs
This puts the circuit over the permitted zs. I begun seeking out the issue.
However the other electrican said...
Hello there everyone, I've dead tested some ring mains on a job recently but unfortunately I didn't do my measured end to ends. The circuits only have two spurs on each.
I have my R1 + R2's, it was wired in 4mm T and E so the earth is obviously 1.5mm.
For example, if one circuit measured...
bcwright
Thread
calculate
conductors
final
measured
ring
ring final
Discussion/s to be had.....If one measures Ze, then measures R1+R2 at all points on circuit, would the result be a measured Zs.......
What is the point of carrying out highly inaccurate 2 lead Zs tests which do not tally with 3 lead tests carried out on the same machine......
The earth fault...
Hi all
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...
Q, The earth fault loop impendence measured for a circuit is
L1.1 0.61
determine showing all calculations weather it complies with Bs7671
what do I need to do
Can anyone give me the formula with ref to Appendix 14 of the regs??
Near the bottom of that page it says accurate calculation of Zs with
respect to load current and conductor temp.thanks
Hi all,
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...
Hi guys,
Im just filling in my first ever solo EIC when I check the onsite guide and gn3 for max permitted zs (tabulated) for bs60898 type b 32A the table shows 1.16ohms but to me it didnt ring a bell, checking bs7671 table 41.3 shows max zs to be 1.44.
Can anyone shed some light on why and...
Silo
Thread
earth
impedance
loop
loop impedance
max
measured
query
I was wondering if anyone can help me out with this conundrum.
I was testing a domestic property and tested a security alarm which was a 6A MCB not supplied by any RCD.
Ze was 0.12 Ohms
R1+R2 was 0.10 Ohms
Now using the calculation I assumed the reading would be no greater than 0.22 Ohms...
I have some remedial works to do on a fairly large commercial installation.
The majority of the submains from the main panels are protected by 63 and 100A MCCBs, and as a results of a high Ze (0.24), a lot of the submains Zs’s don’t meet the regs figure.
Replacing the cables is not an option...
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
kshah86
Thread
earth
factor
fault
impedance
loop
measured
question
value
Hi!
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...
matt_bei
Thread
light
light switch
lights
measured
normal
pendant
switch
switched
voltage
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