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  1. J

    Length and size of armoured cable.

    Afternoon All. I am currently doing an electrical job for a customer, who has a build an external shed, at the back of their garden. i have currently installed 15 double sockets, 2 lighting points on 2 separate circuits. The distance from the consumer box to his shed is approx 30 metres...
  2. V

    Hi I'm new here! Have a question on Radial & Ring circuits

    I am a DIY and working on an extension on my home. I found out that one area of my house is on a 4mm radial for sockets on a 32amp mcb which I know is fine. Now the question is Can I safely continue wiring 4mm radial? Total length from distribution to last socket will be around 60metres with 12...
  3. N

    0.00 ohms r1+r2 on radial circuit?

    Hi all, I've tested several radial circuits and only getting 0.00 ohms on the r+r2 test (zero'd leads) 2 of the radials only supplies one socket each and are approx. 3 metres in total length. (zs 0.25 and 0.21) Another radial only supplies one socket and is appox. 5m in length. (zs 0.35) The...
  4. uksparks

    Meter tail length

    Hi, Quick issue here, went to a job today, basically the roof you can see is a garage roof attached to the side of a bungalow, the roof is coming off and being raised up in line with the rest of the house and being converted into a dining room and having a breeze block liner inside. Other than...
  5. S

    Course Length Query

    Hi all, I am 29 and am currently looking to completely change my career as I have had enough of continually sitting behind a desk. I have looked at some electrical courses and think that I have found one that can work around my full-time job. Its the City & Guilds 2365 NVQ Level 2. The...
  6. H

    Help with EICR code!

    Hi, just wondered what your thoughts are on this, 3 bed town house Whole house ring final, mixture of 2.5 / 1.0 & 2.5 / 1.5 twin and earth cables, End to ends = 0.78, 0.78, 1.6. R1r2 = 0.61 (spur). ZS = 0.66! BS7671 recommends a max of 100 square meters which using 2.5/1.5 = an r1r2 of...
  7. R

    I Can't See How This Works...

    Here's the scenario: Ring Final Circuit Design Current = 20 Amps Circuit Breaker = 32 Amps (may well be using an RCBO - but that's another story) Ring length total (end to end) < 45 meters Correction Factors - grouping factor of 0.78 (reference method E with 9 other circuits) Gives an Iz of...
  8. G

    how to cure a blowing fuse

    Some latvian contractors had complained about a welder blowing a fuse on an extension lead repeatedly,Finally they announced they didn't need the electrician calling out as they had resolved the issue,yes that is a piece of an M6 bolt!
  9. P

    am i doing the right course length time ???

    Hi there!! I'm new to this site and I am whishing to become an electrician I am currently studying at night class at a my local college L2 2330 2year and then L3 1year so all together 3 Years some people have said why not train with the olci and you will be trained in 18 months but some people...
  10. K

    Ohms Law & Cable length

    Hi guys,, Brand new here so easy going ok! Something is baffling me and i cannot for the light of me figure it out even after study of GN3. I'm 41 and been around a while so not wet behind the ear. If 55m of 2.5mm cable has a known resistance of 7.41m ohms per metre this equates to...
  11. M

    Voltage drop calculation

    Hello everyone just want a little help how you would calculate the volt drop if 230 single phase heater circuit line & neutral conductors combined resistance of 0.68 Temperature at 20 degrees and load current of 16A? show calculations got this in my 2395 today wanna make sure I used the...
  12. A

    two methods to verify a low ohm meter i think is not working properly?

    I am looking to answer a question on a course, and cant think of 2 methods to verify readings on a low ohm meter....please help?
  13. M

    Maximum cable length.........??

    Good afternoon all, firstly im pretty rubbish at cable calcs. My question is this, the load on the circuit is 6.6kw for a outdoor ev charger so the cable would be clipped direct. Using 4mm NYY cable is ok subject to the cable length, any ideas on the maximum cable length before having to use...
  14. N

    cable length

    Hi there, I've been asked by a farmer to replace the overhead cable going from the house to some of the sheds. The cable goes from the house to Shed A where it splits in a consumer unit and onto Sheds B and C. When calculating voltage drop to I enter the entire length (i.e. from house to Shed...
  15. F

    Radial length

    Ok just a quick one got brane freeze here a 20a radial can be no more than 50m2 so if this is a straight run what length is it basically how do you convert square metre into metres in a straight run thanks in advance
  16. A

    Meter Tail Length - Getting the Electrical/Mathematical Equations from the DNOs.

    Hi everyone, I'm new to this forum and this is my first post, so apologies if I get anything wrong. I do a lot of property redevelopments, and some landlords (myself included) prefer to put the elec and gas meters outside the property in meter boxes. This can cause issues, as often the only...
  17. Y

    Voltage drop question

    Hi everybody. I have a question (still learning, passed 17th edition and part P, but I'm not yet registered). If you use formula from On-Site Guide p.140 what the design current you put in the formula, to calculate max length of cable for 11.5V. If 32amp then the maximum length of ring final...
  18. J

    Cable sizing for 24V LED lighting

    I believe I have been wrongly advised by my supplier about sizing cable for a lighting installation and I was hoping that someone with more experience of DC cabling will be able to set me straight. We are looking to install some LED strips to a coffered ceiling above a swimming pool. I have...
  19. B

    Earth Electrode Testing

    I have been tasked with carrying out some earth electrode and LPS testing using the fall of potential method but to do this I need to know the length of the rod. How do I work this out if I don't know the length?
  20. F

    Calculating Voltage Drop on a Ring main

    Hi Guys, I'm fairly new to the industry and have sat and passed all the relevant exams to become a Domestic installer. I'm a little stuck with one of my pieces to be assessed by NICEIC. I'm doing a full rewire at my dads house and would like to check that I'm calculating the cable volt drop...

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