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electrical wiring

  1. A

    Consumer unit heights

    Hi guys I've read consumer unit heights are to be situated so that the breaker switches are between 1350mm and 14500mm from the floor in a new build property. Is this really the case. Is this a must or can the consumer units when being installed in a new build property be installed lower for...
  2. A

    Kitchen appliance FCU

    It isn't a requirement for FCU's to be used for kitchen appliances ie dish washer or washing machine is it in a new build? I was thinking of just putting a double socket in a cupboard and plugging in the two appliance but have read about using FCU's and was wondering if this is a requirement or...
  3. M

    Isolator before the meter

    I wish to find out what’s people’s thoughts on isolators before the meter? Typically they are installed after the meter and before the CU, but does anyone know if there is any reason why it cannot be placed before the meter? Aside from what revenue protection like or not, is there any legal or...
  4. J

    RCD vs MCB...

    Does an MCB protect against fault current in the same way as an RCD does? As in, both devices trip by way of detecting imbalance in the Line conductors and thus using magnetism to sprag the switch? I ask, because if so, I can’t get my head round why an RCD is better than an MCB. I know that it...
  5. J

    RCD impedance

    Hi everyone, I appreciate this is probably a really silly question. I’ve come across the below test question and although I know how to find the answer, I don’t understand why we would need to know what the max permissible earth fault loop impedance is in relation to a 30mA RCD? I hope someone...
  6. Bear

    A Question from the 2392/52

    Morning all, Am studying for my multiple choice questions next month, and my brain does not seem to get these type of questions? Want to now if am doing it right and understanding the theory correctly. The question below and then the way i got my answer. A radial socket outlet circuit is...
  7. A

    Tv socket height new build

    1200mm is the max socket outlet height in new build property so what's the score with putting a socket at a height where a wall mounted tv will be situated obviously required to be higher than 1200mm. Is this now not allowed for new build properties?
  8. T

    Weird Earth Fault

    Had a weird one today. Doing an EICR and the lady says yeah we dont touch the screws at the switches or sockets as we get a shock from them. I said yeah?? Went to unscrew a light switch and sure enough zap. Touched it again and nothing so i was thinking static. Tested the house ze 0.14 tncs...
  9. A

    Consumer unit heights and mains tailsnew build

    are the consumer unit heights for a new build 1350mm and 1450mm. The services to the new build property will be on the front outside wall of the house meaning the tails will have to be passed through the cavity wall. Can I pass the tails up through the cavity wall to a reasonable height and...
  10. xylophone

    How insistent should I be on type certification

    Hello forum members I am installing a Switch fuse unit bought from CEF. It’s a Proteus unit with a proteus branded main switch and Ferraz Shawmut fuseholder I queried the type certification for this combination because the images on the website had proteus on the fuseholder too but It wasn’t...
  11. A

    Loft installation methods

    So new build bungalow is to have 300mm loft insulation as told by building control. This means installation method 101 comes into place however as it's a bungalow all circuits including cooker ring mains etc will be installed this way as they come from the loft space down. This installation...
  12. A

    Loft insulation and ratings

    Hi guys New build small 2 bed bungalow to have 300mm of insulation in loft space. Obviously all circuits to be ran in loft and dropped. Circuits to be used are alarm circuit 6amp, lighting 25x 4w downlights 6amp, 2 x 32amp ring mains, 16amp boiler radial, 32 amp hob/oven circuit (undecided if...
  13. J

    Calculating R1+R2 on a ring...

    Hi guys, I just need help with something really basic that I’m struggling with in terms of calculating resistance (as opposed to measuring). Just a hypothetical question here, not a real situation, I just need to understand the theory. If I had a socket, just 1, on a radial, running from DB...
  14. HappyHippyDad

    Is an extractor fan required in a NEW utility room?

    The customer is having an extension. This will include a utility room which will have the usual in it, i.e. sink, washing machine, fridge. There will be a window. Approved document F is pretty big and I was hoping that someone could assist in pointing me to the right bits on whether an...
  15. A

    New build bungalow project

    A friend of mine is currently building a 2 bedroom bungalow and wants me to wire the house up. I've never been involved in a new build before especially a bungalow. I understand part p needs to be taken into account. I have attached the plans to give a better Idea There will be two bedrooms...
  16. G

    Regulation 434.5.2 - Time a conductor can withstand fault current

    Can anyone help me clarify the formula in regulation 434.5.2, the time a conductor can withstand a fault current without sustaining damage. t=k2 x S2 / I2 The regulation states I is the effective fault current. Does effective fault current mean the prospective short circuit current/...
  17. 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...
  18. S

    Electrical Wiring vs Plumbing

    Thanks to everyone for help with my last question - here's the next one!! Having our 1930's flat re-wired and re-plumbed. Floors and ceilings are concrete - so wires and pipes are all being chased into walls! Radiators are currently set very high and have asked for them to be lowered to a...
  19. S

    Light switch height

    Hi Having my flat re-wires. It’s on the first floor, with no disabled access. Electrician is saying light switches have to be a max of 1200mm from floor (about 400mm lower than their current position!). I realise that this is the standard for new builds - but does it apply to old properties...
  20. S

    Location of isolator switch - bathroom fan

    Just having a bathroom fan installed. It's an intelligent unit that runs continuously but thought it best to have an isolator switch. Have been told the isolator switch has to be outside the bathroom on the hall wall above the bathroom door. We would prefer to have it in the hall cupboard...

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