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  1. HappyHippyDad

    Understanding the relationship between TNCS, TNS and TT

    I have never actually had to make an electrical system into a TT. I have added rods in order to get an effective Ra but never had to (for example) install a TT on a new garage or shed. It's best I give an example with regards my question.. A new garage has a supply taken to it from the house...
  2. S

    Difference between dead short and short circuit

    Hi looking for some help about faults and symptoms and difference between short circuit, dead short, and overcurrent to know which fault you have. Is short circuit line and and neutral fault dead short zero resistance and a tripped breaker And overcurrent to much current in circuit causing...
  3. A

    Difference between Dimplex Quantum models

    Hi all, I’ve got a question about the Dimplex Quantum High Heat Retention Storage Heaters. I’ve been in discussion with a supplier about these. He’s provided a few quotes. He’s knocked about £350 off the price by offering my the G series Quantums. He says these are exactly the same as the RF...
  4. 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...
  5. N

    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?
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. L

    There is a one circuit (one voltage source), two phases and

    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...
  12. 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.
  13. 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...
  14. 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...
  15. 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...
  16. 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...
  17. G

    Neutral between phases

    I am trying to connect a smart light switch but there is not neutral. Next to the switch there is a socket with a neutral but it is under a different phase. I understand that it is the same neutral for the whole house on all phases, but when I use the other neutral, it short circuits. I checked...
  18. 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 :) )
  19. 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...
  20. T

    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...

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