Hi guys.
Got an issue with a DC string ... I am doing some DC testing and one of the strings is 0.5ohms (negative to earth). Positive is 29mohms and rising to earth.
Now usually I would expect to find a crappy mc4 or a damaged cable but this time I am on a farm where all the cable is visible...
Maximum Earth Fault Loop Impedance for OverCurrent Device was calculated
230/(MCB Rating*5) * Rule of Thumb
is that correct?
And how are they worked out now after Amendment 3?
Have a fault reading; Relay check fail.
Done some research and replaced the x2 check relays with quality components.
Still have the same fault sadly.
Any thoughts ?
I rather foolishly booked in a fault finding job in a 2 hour slot thinking I could solve it quickly, I couldn't!
It has me confused, although I haven't let myself slow down yet and focus so you guys may point out something obvious.
It is an intermittent tripping MCB on a 32A ring ciruit...
Hi everyone just to let everyone know that I did my AM2 last week and I only failed on the fault finding part. I was very confident before going into the fault finding test but I lost my way and the pressure got to me. I'm so chuffed that I pass everything else.
Just to explain what the test...
Where fault protection is provided by an RCD, the product of the rated residual operating current (IΔn) in amperes
and the earth fault loop impedance in ohms shall not exceed 50 V.
Hey,
We are putting in a Honeywell flex alarm. It's all wired in (following the manual). The problem is that all the sensors are coming up as having a short circuit and I can't work out why. I've wired it up with my friend (who is an electrician) and we really can't work out the problem...
So here is the situation
22kV/415V delta-star transformer with neutral point earthed on secondary
Downstream breaker of transformer 630A with earth fault setting 0.2xIn @ 100ms
This supplues a number of outgoing loads with respective 50A breakers which only have thermal and magnetic settings.
An...
Hi guys, I have carried out some testing on a existing domestic installation, I was finding a low IR Result on a lighting circuit. I identified and rectified the fault. I am going to carry on the with the testing on the weekend and will be doing the paperwork for my Testing on the install I just...
Hi all,
I was wondering if anybody has come across this fault before that I seem to be getting with my Megger MFT1552.
When I measure the voltage it reads around 260V (iv tried it in a few different properties). Then if I switch it to the RCD auto test or any of the RCD individual tests it...
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