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  1. M

    What should be the minimum resistance required between 3 phase and grounding (connecting wire to earth)

    Hi I am new to electrical engineering. I want to measure the 3 phase voltage near the water pumpset motors. I have connected phase lines to earth through a diode and six 1 mega ohm resistors (measuring the voltage across resistor). The same earthing wire is connected to ground in my dc circuit...
  2. N

    USA Is there an either/or switch

    I need a switch with two live outputs whereby I can switch between L1 and L2 but not permit L! and L2 to be active at the same time. What would you call this type of switch?
  3. P

    Difference between lutron and quinetics?

    Morning chaps, Just doing some research for a job I have coming up where I need to reduce the amount of cables on show and also the customers wants all smart lighting too. I’m looking into both quinetics and Lutron has anyone ever had many dealings with either of these also what is the...
  4. M

    Regulations: Distance between central heating Pipe and Consumer unit

    Hello Guys Hope you are all keeping well and safe in this unprecedented times. Just wanted some advise please. So Yesterday i had a new radiator installed but the installation required extending pipe work under the stairs near the consumer unit and where the main electric feed into the house...
  5. N

    SWA cable between light fittings

    Hi All. I am having my house rendered soon, before that I want to put cabling in for around 6 wall lights around the outside of the house (something like those GU10 up and down lights you see so often), obviously I want the cable hidden beneath the render however the cable won't go in...
  6. R

    Help required please re PRT-E thermostat wiring symbol (difference between models and compatibility)

    Hi all, firstly I’m not in anyway qualified to do any electrical work but was just hoping for a quick piece of help In regard to trying to find a replacement for my non-functioning Uponor PRT-E digital thermostat which controls our underfloor heating. The model in question, the PRT-E is generic...
  7. S

    Do I need an inline fuse between my alternator and battery isolator?

    I purchased a 95 amp battery isolator and my alternator pushes 95 amps but I'm assuming that it may spike above that occasionally. Should I put a fuse between the two? I am only aware of 100 amp maxi fuses would that save the isolator for damage or do I need to purchase a battery isolator rated...
  8. L

    Industrial There is a one circuit (one voltage source), two phases and neutral, but there is an amps difference between Ph1 and Ph2 (minor 3A only).

    Hello Electricians, This is my first post and I'm glad to be one of this forum member. However, to clarify my question. I've a "Skin Effect Heating System", fed by 1240 V. The circuit is quit simple, Phase U, Neutral in the middle and Phase V. Phase U and Neutral feeding the heating cable#1...
  9. M

    236-1 and 3

    I achieved my 236-1 and 2 between the years 1992 and 1997. I have just received my AM2 certificate. I have been working as an electrician for over twenty years. Can I now apply for a jib card with what I’ve got or will I need to do an nvq3. thanks in advance.
  10. 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...
  11. B

    Spacing between clusters of sockets and switches

    Evening, is there a standard gap to put between clusters of sockets and light switches? Eg if you have a couple of double sockets, a tv socket and a lamp socket grouped together, how much of a gap would you put between them. Also if you had few light switches grouped together what sort of gap...
  12. G

    Length of tails between meter and consumer unit

    Hi, I am currently studying for my 18th edition regs update exam and came across a video by SparkyNinja on you tube. I think SparkyNinja is very good and produces high quality content. However I disagree with his interpretation of regulation 434.2.1 (i) In his video he says you need a fused...
  13. Dan

    OFTEC Self-Certification As an electrician, do you feel you have enough independent competition between certification companies when it comes to renewal time?

    As an electrician, do you feel you have enough independent competition between certification companies when it comes to renewal time? (Poll total results are publicly visible - but NOT the actual individual votes - those are private and cannot be accessed via the forum software once the vote is...
  14. S

    Which fuse rating to between starter and leisure battery?

    What fuse rating do I need to put in between the starter and leisure battery? I have a 12V 75AH Starter battery and 110Ah leisure battery. Cable size 16mm or 8mm. (this is for my off the grid van :) )
  15. B

    Distance between Gas and Electric box caravan site

    Can anyone tell me where to find distance between Gas box and Electric box on caravan site I know it’s 600mm, now on new install someone’s connected the boxes now between the edge of gas to edge of electric box is around 630mm but this isn’t taking in to account a socket which will be plugged in...
  16. T

    Domestic Relationship between coax splitter and amplifier?

    Hi New here, so greetings to everyone. Fitted Labgear splitter in loft a few weeks ago to split cable from outside aerial. (One now goes to new tv in bedroom, other downstairs to main tv) Signal is ok (100% quality on all freeview channels, but signal level only about 40% on most) Only...
  17. P

    Domestic RCD trips every morning between 08.00 and 09.00

    I live in rural Italy. You get to chose your max KW here and pay accordingly. Most home have 1.5-3.0 kw, I pay extra for 5kw. I am at the end of the low voltage lines, one of only a few on this circuit. I constantly have voltage problems, according to my fluke multimeter it can go from 190v to...
  18. Litoral

    Domestic Video and simple comparison between the shortest and longest day of the year

    To explain easily the difference in power generation from winter to summer. Might be useful, I hope it helps
  19. rolyberkin

    Joint between 16mm &1.5mm!

    A donut of a builder has helpfully run a piece of swa two core 16mm to a small feature fountain fitted with 1.5mm flex, suggestions on best way to join, couldn’t get the 16mm in a wago!
  20. A

    difference between zi no trip and zi trip

    hi everyone, i have just got the fluke 1664fc can somone please tell me the difference between a zi no trip test and a zi trip test. i know that it in zi trip it is a high current test but still i can not understand why im getting different readings between live and earth. Thanks
  21. R

    Joining wall between 2 flats, sockets and fire prevention

    On site today and heard the carpenter tell the site manager that all the sockets and switches on the joining wall (flat opposite side) will need to have fire prevention boxes built aroud them. The site manager is having trimber supports added for the sockets and told him there is fire...
  22. M

    What is the difference between 6944x and 6943x

    Apart from price what is the difference between the above cables
  23. Baddegg

    TT or not TT................

    so in between stressing about the connection between KA and zs readings (thanks mattja) I’ve been to meet a customer who wants a pub built in his back garden (yep), tncs supply, will be no extraneous parts at all to the “pub” all plastic water and waste,incoming water is tee’d from mains which...
  24. N

    Fuse between batteries

    Hi all I’m in the process of upgrading my solar set up to 2x 260w panels with a 40a mppt tracer I’ve just bought a 2000w(4000w peak) inverter which will be running off my 2 120ah leisure batteries connected in parallel using 70mm2 cable fused at 350a But my question should the fuse between the...
  25. R

    Coordination between conductor and oveload devices

    A good memory trick for exam conditions for coordination Ib In Iz (Alphabet) the earlier letters are always lower in value than the earlier ones, saves remembering Ib < In In < Iz Ib < Iz
  26. T

    Voltage between live and earth

    I've finished rewiring the upstairs in our house (in Bulgaria). This is 3 bedrooms and the living room on separate ring mains. I bought an earth rod and put that in the yard and as I was connecting up the earths, I decided to check if there were any voltages between various points. With the...
  27. jaydub

    100A DP Isolator Installation Between Meter and CU

    Hi guys, When installing a new CU does anyone ever install a 100A double pole isolator switch between the meter and the consumer unit? Very often I come across 16mm tails which need to be upgraded to 25mm so I join the old tails to new in a Henley block and get the DNO to come and upgrade...
  28. Gavin John Hyde

    Parallel earth path between 2 circuits

    I have a ring circuit (circuit 1) and a light circuit (circuit2) in a flat im working on and i have somewhere in the walls or ceiling a joined earth path. From what i have seen there is no obvious metal conduit, so it seems its either the ventilation system that is fed by the same ring and goes...
  29. K

    Cables run in cavity between block and brick of an internal wall

    Hello, I'm currently in the process of building a side extension. I will be putting in 2 new rings and 2 new lighting circuits. To get them from the CU to the extension I wanted to run them in the cavity of the old external wall (now internal because there is an extension on the other side)...
  30. B

    Looking for work between training??

    Hi I’m currently doing my city and guilds 2365 course level 2 and 3 and looking for some work as an electricians mate on my 2 weeks off from the course to gain some experience. I have nearly completed my level 2 and start the level 3 in 4 weeks. I’ve got my own van and basic hand tools I live in...
  31. einstein

    The difference between a registered scheme & standard bs7671 condition report

    Whats the merit between a niceic/napit/elecsa certificate vs a standard bs7671 certificate (available online) for a condition/periodic report? Why join a scheme when its not statutory?
  32. A

    Maximum distance between collectors and tank?

    Hi, I'm looking at installing a solar water system for a friend. He runs a B&B so has much higher hot water needs during the summer, and also a very high annual bill for heating and water. So it seems like he's ideally suited for a solar thermal system to at least reduce the costs. We live in...
  33. S

    Interaction between loads - power quality and noise.

    Hello, Sorry if this isn't the right forum for this. Didn't look to be far off... So I'm looking for some advice please with regards to interaction between loads sharing a circuit. I understand (or think I do!) a lot of the composite concepts and I think I have an idea of what my answer might...
  34. R

    Back box fire ratings

    I carried out an install on a kitchen in a village hall a while ago I installed some deep back boxes on the brick wall but the builders then installed batons the wall and used insulation board so even my deep boxes weren't close to flush with the wall, I put in some long screws to get round it...
  35. C

    Working live

    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
  36. infinity

    Extending Data cable over 270M

    HI all, We have a customer who has 2 x 50 kWp solar arrays (one with SMA inverters; the other Delta) with a 50 kW export limit. He currently has a Cluster Controller / Energy Meter set up and working fine to limit one of his 50 kWp arrays (SMA) to zero export. The customer would now like to move...
  37. buzzlightyear

    new 18th regs, coming soon to your nearest cinema soon !

    more monies down the drain .
  38. D

    LED GU10 bulbs still glowing when turned off

    Hi Guys, Just need a little advice if possible. I have recently fitted 6 GU10 Downlights 230V on a customers landing with 5W Cool LED GU10's. When he turns off his light one light is still slightly on. I know this has something to do with the two way switching for the landing and a bit of...
  39. A

    3 phase quarry pump

    Latest fact finding mission for you gurus to help me learn about Todays problem was a quarry pump not running, guy went out and meggared the cable and pump and found one of the two 10mm cables was down on the black phase. So while cable was ordered up and being delivered he was called...
  40. F

    Voltage through earth to desk

    I built a metal desk with wood top. I just wired in a 500W heat lamp on the desk. 13A plug goes to a single metalclad socket via 1.5mm2 3 core cable. Same cable then goes from socket to 1 way metalclad switch. Same cable then goes from switch to heat lamp. Earths are all connected to each...
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