Instyle LED Lighting Specialists UK
This official sponsor may provide discounts for members


  1. H

    208V Single phase wiring from 3 phase 4 wire disconnect

    I work in a location that was once a Machine shop showroom. We have 208/230/480 etc in the building. I need to install a temperature chamber that requires single phase only 208V or 230V supply. I have a 100 amp rated disconnect literally in the exact location this needs to go. I've read for...
  2. E

    Insulation resistance check on LED fittings

    Hi, Do I need to disconnect LED fluorescent fittings when doing an insulation resistance check? Thanks
  3. P

    URGeNT wiring the disconnect to 3000 watt water heater

    Hi, I'm replacing oil water heater with 3000 watt electric. square d main panel. bi pole 20 amp breaker. 12/2 wire to a eaton dp221ngb 30 amp disconnect. I have 118v on both conductors going in disconnect but no power coming out. two 15amp glass type p fuses are in the disconnect. Why is there...
  4. G

    Temp pole 100-amp disconnect to original 100-amp main panel wiring.

    Good morning, I'm hoping that a crusty retired construction super is welcome here. I'm remodeling a cabin that has the old 2-wire electrical system panel, so all the neutrals and grounds are attached at the same ground strip and the cabin service drop is 2-wire URD. I already updated all the...
  5. Vortigern

    SWA supply cables between buildings will not disconnect in required time

    Doing calcs on swa supply to building as sub main from main three phase squard D board for single phase supply off of TN-S supply. I used cable mate from jarsoft and looked up various tables for disconnection times. In all case scenarios it tells me it will not disconnect within the required...
  6. K

    Disconnect, grounding and mechanical protection requirements when bringing power to a chicken coop...

    Hi, I want to bring 2 x 20A (@120V) to a chicken coop. It will be powered from my garage panel which will require 140' of cable. 85' in the garage along 2 walls, and 55' buried between the garage and the coop. I used a few voltage drop calculators and it looks like I will need a 6/3 to stay...
  7. S

    Breaking negative DC twice in disconnect

    Hello all, We have a 175 Kw 1500Vdc string inverter. It has 12 mppt channels with 2 inputs each. Each channel (you can have 1 or 2 strings per "chanel") has 1 DC contactor for the positive and 2 DC contactors for the negatives. Does anyone know the specific UL requirements for this and where to...
  8. littlespark

    Something else to disconnect before testing...

    First came double sockets with integrated USB outlet, now BG has a double socket with USB and a built in wifi repeater. I think i'll just stop using 500v dc across L & N completely. I'm now waiting for double socket with integrated toilet roll holder.
  9. Mr.Smith

    HEAT TRACE - What should be used as means of disconnect?

    Currently overseas and inside a small pumphouse heat trace is required. Wondering if I need double pole RCD protection for it? Thanks in advance.
  10. the pict

    RCD issue, or is it?

    Changed a consumer unit everything fine all test came back hunky dory, but one RCD would not trip on the test button so swapped them around, same deal,I then got random trips from unassociated circuits IE kitchen ring plug in kettle and the opposite RCD would trip disconnect incoming earth...
  11. MKspark

    Isolation Certificate

    Morning All this might seem like a strange question but we are re-wiring a lot of kitchens where the kitchens will be ripped out the day before we start works, but they would like us to isolate the Kitchen Ring and cooker circuit before its ripped out as some points are surface mounted on the...
  12. J

    Insulation resistance testing Lighting circuit

    Hi everyone. I'm looking for advise on how to test IR on commercial lighting. There's so many lights on 1 circuit , do I have to take out all the lamps in all the lights to perform the test or can I simply test between LN -E ? Even though I have spent lots of time testing domestic installs and...
  13. P

    Domestic Quote for replacing old storage heaters

    Not sure if this is the right forum but can anyone advise on this? I am replacing 2 storage heaters and have been quoted around £1,100 plus vat for removal/disposal of the old (non asbestos) ones and fitting of the new ones (Dimplex manual not Quantum). I could order these heaters myself for...
  14. S

    Disconnecting a power outlet from a 3 phase control box

    Good afternoon everyone, I'm hoping someone can give me some advice /guidance. My brother in law has a large saw bench with a 3 phase motor, he has sold the bench but we need to disconnect the cable for the motor from the metal electrical 3 phase control box. I'm a retired person but have done...
  15. S

    IR testing

    Hi guys, might make myself look stupid here when wanting to carry out an IR test on a lighting circuit and you have sensitive equipment that you can't disconnect,if you do an IR test linking L-N to Earth is this basically the same as testing L-N. the reason I'm asking is because I have an issue...
  16. keniff

    Texecom alarm

    Hi guys I have a texecom veritas alarm I installed about a year ago, I'm wanting to move the bell box outside to a different wall but Im not sure how to bypass the tamper on the bell box so it doesn't bell up when I take the lid off, any ideas or help would be great!
  17. M

    removing alarm sensor

    Hi guys. Just a quick one. Doing the electrical work on an extension and they used to have a garden shed with an alarm sensor in it. I want to remove the sensor from the system but wondering what's the correct way to do it. The sensor has a +,-, tamper and N.C in it. So do I just bridge out that...
  18. G

    unidentified circuit

    did a cu upgrade on a house the other day but could not identify 1 16a radial circuit. The old board was not labelled and the owners were no help. I searched high and low for it and the house was also full of junk which didn't help. What do others do in this situation ?
  19. D

    rcd meter tails

    hi i tested a domestic property earlier,and someone has sunk the meter tails,the fb is a 17th edition,my question what size external rcd is required for the meter tails,its a pme system,many thanks
  20. D

    ADT Alarm (won't let me post in Alarm)

    Hi Guys, I need to disconnect a phone line from an ADT alarm system. Contract is up and customer just wants a bells only system. I imagine once disconnecting a fault will throw up....can this be removed in user functions? Am not keen on crashing and re-programming the whole alarm. At this...
  21. A

    TT System testing and results

    Hi Guys, I have been testing for about a year and have come across my first tt system yesterday. I disconnected the earth and tested for Ze and got 8.67 ohms which I believe to be a great reading as osg allows up to 200 ohms. I couldn't do a Ra reading as the rod is under the house and...
  22. G

    Arching from neutral on stud work

    Hi all, took s load of sockets off on a job and plasterers have been in to take the plaster board off , builder rang me and he says its arching on the stud work from the neutral, going down tomorrow to have a look, lives are out of the RCBO's but earths and neutrals still connected. you guys...
  23. S

    ZE Testing

    Hi Gents. What a lovely day - 27c in my living room!! Will need the fan tonight. When ZE testing do you take the main earth out from the CU or the MET? If you take it out of the CU would I get bad readings due as the earthing to the gas and water services? Thanks
  24. 5

    A couple of AM2 questions.

    Hi all, I'm new to this forum and its due to the fact that I have my AM2 exam this coming Monday. I just have a few questions. - Do I need to earth bond the cable tray? - I know that the External Loop Impedance Test is on the incoming side of the installation, and that when testing i need to...
  25. D

    Domestic Switch spur behind fridge what can you do

    I installed a switch spur behind fridge customer was not impressed, but what can you do in this situation I assured him it was perfectly fine, no cupboards next to fridge only way round it to make the fridge sit flush anyone else had a situation like this.
  26. B

    Domestic RCD tripping, advice

    Hello, to everyone, would like some clues and ideas please, from obviously more experienced members on this forum. Have attended the call out from customer, apparently his sockets don’t work. The board is old with plug in BS1361 cartridge fuses, as soon as I put the only one ring circuit fuse in...
  27. N

    Testing Help

    Hi guys starting a new job testing commercial properties, i have passed my 2391 a few years ago and im just looking to refresh myself< 1: when doing an IR test on circuits protected by rcbo's to i have to disconnect both neutral and earth flying leads? 2: what are the flying leads on rcbo's...
  28. P

    Insulation Testing Conundrum

    Hi Guys Domestic - Old Hager Box 14 MCBs RCD Main Switch. Totally stuffed with wiring - not keen to disturb Tested the Full L+N busbars to E. IR = 1.8 Meg b****r! So close to 2 Meg! Tried L busbar to E -all trips off. 1.8 Meg!!!!!!!!! - had to disconnect RCD! Tried each cct in turn L to E...
  29. Y

    IR Testing

    Hi All, Firstly I'll apologise for not trying to collate this with another thread, But thanks to my organisation skills I find myself short on time. I'm currently at College and coming up to a assignment to do with testing etc. I understand pretty much all area's of testing, However theres a...
  30. F

    IR Testing lighting cct with fixed bathroom extractor load

    Domestic CU change, TN-C-S. Lighting circuit has an Extractor Fan with Electronic timer installed. When performing IR test on the lighting, should i just test the whole lighting cct between L & N (connected together) and the CPC - I do not want to remove the cover of the extractor to disconnect...
  31. P

    RCD test button

    If an RCD passes the manual push button test, is this any indication that it will disconnect in the required time under actual fault conditions?
  32. R

    Testing help

    Morning all! Just completed my two jobs for my NIC assessment. Confident in my work and all of my test results etc. Anyway assessor had a cancellation so has booked me in for this friday so just wanted to double check a few things that are playin on me a bit. Nothing major but just wanted to...
  33. T

    Domestic RCD's

    Hi people, Can any tell me what would make an RCD take a long time to disconnect, i understand they monitor the line and netural wires but what would make them take a long time to disconnect or not even trip when testing. Many Thanks.
  34. L

    Disconnecting a 3 phase compressor

    Hi all, I've just been asked to disconnect a 3 phase compressor. Not having done this before is it just a case of power off, disconnect then power back on or is there something special I'm missing out or need to consider? Regards.
  35. M

    Advice appreciated Radial/Ring Circuits

    I have a customer with a 4 double socket ring main on a 32Amp MCB in thier Snug, R2 and RN are all Good but R1 is open Circuit. The CU has a 100mA RCD on A TNCS (need to change it to a 30mA) the house was refirbished about two years ago and dont think the builder got in a proper Electrician...
  36. W

    Dead Testing - 3Phase Motor and S-Plan

    When testing Insulation Resistance or Continutiy on a 3phase Motor, do you need to disconnect the cables from the motor? Or do you just test I.R to the starter, then I.R from starter to motor? (as the starter will be open when dead) Would a motor come under "equipment vulnerable to testing"...
  37. R

    Testing Zs - disconnect main bonding or not ?

    Hi When measuring Zs on circuits do you guys leave the main bonding connected or disconnect it? Most of my testing books including GN3 say leave it connected, but another book by Anthony Hinsley says to disconnect it as it will introduce parallel paths (which I get) and that if left connected...
  38. C

    Problem with Power Cabinet blowing fuses

    Hi there, I have a ----y problem as follows: I have a ABB disconnect switch Fused at 60A, supplying 3 phase 575V(North America) to a Power Cabinet. The Power Cabinet has several motors and a 6000VA transformer, that steps down the voltage to 230VAC/120VAC single phase. The Cabinet...
  39. Mark.W

    Minor work IR

    Chaps I replaced a single socket for a double socket for a customer today, and whilst doing the IR tests noticed that the Line/Neutral reading was low. The readings were: L/N 0.95 Mohms L/E 97.6 Mohms N/E 87.4 Mohms I checked and made sure that nothing was plugged in on the ring and noticed...
Top Bottom