I have my AM2s coming up and i am a little confused to the live polarity test on a 3 phase circuit. It's the first live test and I dont want to fail on what is a simple test. I know how to perform a live polarity test on a single phase circuit but unsure on the procesure for 3 phase. Is it just...
Does it matter which way you connect the 2 wires to an engine's coolant temperature sensor?
Does the thermistor inside the sensor have polarity?
I do not know the pinouts on the car's temperature sensor and I do not want to risk damaging the car's computer.
Thanks in advance.
Carried out an eicr and noticed x2 double sockets have reverse polarity that supply a frying machine at high level.
After correcting the reverse polarity on the two sockets i plugged the fryer back in and the circuit MCB tripped out and the appliance popped.
I am unable to open the fryer up as...
Been on a job in Warmley this afternoon, customer told by Knowhow/curry's that she has reversed polarity so couldnt connect washing machine. worryingly all faceplates were metal so not ideal!
Go out and 230 between neutral and earth,nothing between line and earth. called western power who sent...
My customer has a series E consumer unit which has a 100mA MK RCD as the main switch. I am adding a socket to the socket circuit on this board so need to give it 30mA protection.
I happen to have a 30mA Steeple RCD for a series E CU (I collect as many different CU's as I can)...
Gas safe plumber here please be gentle.
Just went to a boiler breakdown. I traced the fault to the room thermostat so I linked it out on the pcb board in the boiler.
The boiler is working fine now. 2 year old B&Q combi.
While I was there I checked with my multimeter the supply...
How many sparks would work in a square D KQ 3phase DB board if it was LIVE i was putting a new mcb in a live DB and it blown the MCCB at section board i tested between phases and there was no polarity between any conductors switched the MCCB and it tripped again
WHAT COULD OF HAPPENED
Hi Guys, im hoping someone can help me.
I have recently installed 3.2kw system for an offgrid job. The problem im getting is that im only ever seeing around 300 watts solar generation for the whole system.
We have used 10 x Canadian Solar 320 watt panels Voc for the panel is 44.9 and the ISC IS...
Hello beautiful people.
Quick one for anyone who may have an idea:
Attended job today with a room with 2x 5ft fluescents not working and found 50v between N-E. I did basic tests on the fittings (continuity, ir, etc) - all ok. main earth and everything else ok.
Checked the light nearest the...
I use a Socket & See tester instrument to provide a means of confirming safe isolation before working on boilers.
Can anyone explain why I am required to press the touch pad at the bottom of the test instrument in order for it to perform a polarity test?
I understand what polarity...
Does anyone know how to test the Earth Fault Loop Impedance on a monitored circuit such as IPS?
I have found in the past that even a Martindale Socket Voltage Tester can trip out the circuit as it is monitored.
I also found that no matter which way the neutral and line test probes...
Hi all, my mum runs a B&B and has a lot of issues with European guests forgetting adapters, etc. and was wondering if fitting a European socket in the house would be ok? I'm yet to confirm the actual voltage in her house but can't see anything wrong otherwise? She's provided adapters in the past...
Was asked to fit two transformers for shop window display.
there was 8 12V down lighters in total split into two circuits and both switched through a timer,
The owner wants to replace the 8,12V dichroic MR16 bulbs with 12V MR16 LED 1.8w bulbs.
The reason he wants to replace the dichroic...
Hi, I am a newly qualified electrician and have a quick question. A friend asked me to take a look at a socket that was making an arcing noise after a water spillage so I went round to have a look. I ended up swapping the socket for a new one and this fixed the aching noise however when I...
This is probably very easy but for the life of me I haven't been able to discover the answer and solution.
Three phase taken to a tpn fused isolator, then taken to a sub meter and split to three spn consumer units (each being sub metered again) The neutral has been taken to a Henley...
Can anybody tell me the sequence of testing that's stated in BS7671? At college I've been taught CRIPES, which is:
Ring final continuity
Earth loop impedance
Why are these carried out in this specific order?
Working in Wales yesterday, 9 255w panels and 1 SMA 2000HF Inverter.
So we have 1 string of 9 panels in series.
The roof was like this with each letter corresponding to a panel.
ABC panels in landscape, the rest portrait.
All panels at same...
Im going to be doing my am2 in September, I'm very confident with the build. The only thing I can't get around is the live tests, what order do the live tests go in? Also some help on fault finding.
Under what circumstances would a Sub-DB need to have MPB links to water and gas?
I had always believed that the CPC of the feed from the Main-DB would be sufficient, assuming it had been designed and installed properly.
Got a situation where you have a small Sub-DB in a caretakers office...
well that was fun!
very limited testing of dc
turned up at job this morning a field of solar panels to test
5 mins instructions off we went
carried out irpos to earth array
neg to earth array
isc with test isolat
managed to test 1 string pair on 50 invertors
not bad for first day!
Morning all, many RCDs have N or L marked on the front of them, to indicate polarity, but just looking at a bunch of Niglon pre-populated CUs and the RCDs all have N in the top left corner on the front, which I thought meant the left terminals are Neutral, but the Neutral bar is in the right...
Ok here is a fault I discovered today which is a bit of a headscratcher
Was called to a house today to look at problem with upstairs sockets, the customer was saying that they were working intermittently
so first thing I did was get the volt stick out for a quick check. There was one socket...
Ive just got back off a job, I narrowed it down to the immersion heater element causing a b16 60898 mcb to trip.
I disconnected the thermostat to see if that was causing the problem first which in this case it was'nt.
I then put the terminals straight on to the element terminals to...
Hi all, FIRST POST, yay. The problem I have is a 17000tl that will not work because the device shows 'ISO' is falling below 1000. Samil have a UK tech guy. He started last week, I had him on site today, a good guy, willing to help and learn but neither he nor I no what 'ISO' is or what it's...
I just wondered why i would get a reading of 1400 - 1800ohms between lives on 2 different circuits one being a new circuit installed about a month ago by an other spark, the only reason i check was two ring mains that had been put into one mcb by the last sparks and told the customer he need a...
Just recently bought a house and been looking at the electrics making sure it is all right. The property has a conservatory on the back and a light which doesnt work. When I measured between live and neutral I got 0v so went back to the switch. Here i also got 0v. Went to measure between earth...
might be answering my own question here if you have wrong polarity on a strip light the lamp will still work so we are in the process of changing these to led strip light (flurocents this is ) were the lamp is 18w 75v dc you only have to wire one end of tube but if you get the wrong polarity it...
A customer ive quoted recently wants panasonic HIT panels as part of the system and ive never fitted these before, on segens website it says dont reverse the palarity on multible string otherwise you'll destroy the panels, so im a bit reluctunt to fit them as there not the cheepest...
I have my 302 Practical exam (testing) on Wednesday. I just wanted to know if I am right in what I'm doing.
1. First you would do the Testing of the Protective conductors. Using the R2 method (Long Lead)
2. Then you would do the R1+R2 Tests of all your circuits. Connecting Live and Earth...
doing R1 + R2 on lighting circuit green probe on cpc
Red probe on Switch line (switch ON) or Line.Which is correct? Switch line to confirm polarity? .took readings on both .why is switch line reading higher. Thank you for any replies.
Been doing an eicr today, went to do an R1+R2 on a lighting circuit and got no reading between earth and live but neutral to earth was 1.36 ohms. Straight away thought reversed polarity, but the luminair was working correctly before we arrived, so i put the power back on and checked the voltage...
Hey, I have a Megger 1553 and lent it to a friend, who is an experienced spark with 2391 and good knowledge/experience of testing. However, friend carried out PFC test using 3 leads, even though PFC should be carried out using 2 leads on this unit. Since PFC was carried out incorrectly the...
Trying to decide which socket tester to buy, I like the Socket and See 32 / 34 /36.
I already have a Megger 1553 which has RCD and Zs test.
The highest model seems to detect E/N incorrect polarity is this only if the installation has an RCD?
I used my fluke for the first time today practicing on a test board I built up for 2391 paractical exam.
I went through all the tests and got to the live tests.
First test was supply polarity and I am getting a reversed L-N reading on the display. L-E read fine, N-E also reads fine...