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  1. H

    Correct warning signs for high voltage (potential belt off 2 phases) please help!!!

    Anyone with experience of this or an idea please help. I have 2 phases going going into a cab, each one 230v. However there is a real chance someone could touch the two and get a belt from each phase at the same time. What would be the correct type of warning sign to use? Also out of...
  2. B

    Correct size trunking for heat dissipation?

    I have to do an install using trunking which I have nebr used before, I understand there had to be 45% free space inside for heat travel. so what size trunking do I need to fit two 2.5 t&e cables inside? As I said I have never used trunking before so it is new to me.
  3. J

    who's correct with electric company rpi increase...in there quote.

    i have had a few solar panel quotes where one guy has said a ten percent year on year rise in electric one at 5% one at 7.% and this makes quite a bit of difference to my returns who do i believe and who's is the more accurate figures should they not all be using the same increase percentage...
  4. J

    Cooker circuit info

    Hello all. I'll start by saying this is my first post. My name is John and I'm a maintenance engineer (electrical) from Scotland. Have found alot of cooker info on here but just to make surey My fully electric cooker is rated at 12925w and there is also a 45a fuse protecting and 6mm cable...
  5. P

    plastic conduit cutters

    Hi guys and girls, Im now in the market for some new plastic conduit cutters any reccomendations please ? :bulb2:
  6. R

    EICR's

    Am i correct in thinking you don't need to be registered with a scammer scheme to do ECIR's?
  7. F

    Is this calculation correct?

    Hi i was looking at this old post and saw a calculation resolved which im not too sure is right and would apprciate confirmation wether it is or isnt Q24. A continuity of ring final circuit conductors test is to be carried out on a circuit supplying the office. The circuit is wired in 2.5mm...
  8. HappyHippyDad

    Correct wiring of RCCB?

    Hello all.. I figure its better to ask and be ridiculed than not! I am about to add a couple of spurs to a ring that is not RCD protected. The neighbour definitely wants them channeled in rather than surface trunking so I have to RCD protect. It is an old Tenby CU with crabtree SB6000 MCB's. I...
  9. T

    sorry if wrong section- help with Q on inductive reactance - revision homework

    hi all, can someone if the following answer is correct. would as teacher but 2 days till class. a coil of inductance of 0.2H is connected across a 230V 50Hz supply. What will be the current flowing in the circuit, if we assume that there is no resistance? XL= 2pie fL XL= 2pie * 50 * 0.2 =...
  10. S

    Correct RCD switch?

    The RCD switch in my small consumer unit in my shed is a 25A 30mA RCD. The switch is knackered but I've found an old one I've had from an older board. It's a 40A 30mA though, is it still ok to use this? Although the supply is only 4mm it is protected by a 32A MCB in the domestic mains board. The...
  11. T

    What circuit to test?!

    Went to a mates new bungalow as he wanted me to cast an eye on his electrics to make sure all is ok, (didnt want a EICR). It is generally in a good condition, correct earthing, correct selection of MCBs, RCD etc but the lighting has no CPC. I explained the options but he wants me to re-wire...
  12. kingeri

    Correct cable for SELV circuit

    Hi guys, at a job tomorrow and looking through the spec. Bathroom is to have 12v SELV downlighters (not sure why). What cable is best to use for the run between trannies and lights, i.e. the 12v parts of the circuit? It's been a while since I've had to deal with these, as I don't recommend...
  13. K

    16kw 3 phase load. do I NEED 4 OR 6 SQ CABLE? Thank you

    16kw 3 phase load. do I NEED 4 OR 6 SQ CABLE? Thank you
  14. M

    Megger 1720 with correct firmware, sucess!!!!!

    Hi all, was very sad on thursday, picked up my megger 1720 which had old firmware on, V1.01, hence would trip rcd, rcbo's out on low setting loop tests, wasnt impressed at all, took it back and got another one with firmware V2.05, works perfectly very happy now, thanks for those who replyed to...
  15. F

    Wiring Advice for Garage RCD Needed

    Hi all, I am looking to replace a very old and rusty RCD unit with a modern day unit. The old unit is different to the new one and I would like to be 100% sure i have the wiring correct. The situation i need explained is this: 1. I have the mains coming into the unit 2. I have a 2 way...
  16. C

    Newbie question... garage circuit connected to ring final circuit.

    Hi, I am studying for me 91 and am currently practicing on my home. I have found that my garage circuit consisting of a small 2 way CU with 1 of each; ring and lighting circuit (no RCD). I expected to see this circuit connected to the main CU through its own CB but in fact it is connected to...
  17. S

    Megger 1730 have I done the correct thing?

    Hi firstly I'm new to the forum and understand there will be a few topics in the past on this so sorry in advance. Iv just bought a new test meter and it comes tomorrow having a job to test later in the week. My old boss has always used Metrel testers and they seemed great but I always fancied...
  18. P

    polarity testing

    hi guys, when testing to confirm polarity of swa going from house to outbuilding. a. why is it necessary b. why is it carried out before the installation is energised
  19. K

    DNO 1st Notification Help/ Schematic Drawings

    Hi All, Wonder if you can help me, we have only just become MCS registered and we have our first Solar PV installation planned next week, this is a 4kw but we are using a 3.6 Powerone inverter and it is capped at 16 amps, am i correct in saying that i dont need to prenotify but i have to...
  20. i=p/u

    have i got correct testing forms

    the house im working on at moment has had a conversion to attic, i had to change the board for extra ways.. do i use eic for new circuits and eicr for existing circuits or can i put on one eic and comment on what happened , i.e changed board for extra ways

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