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  1. L

    Volt drop question

    Hi I've got a question regarding volt drop. When calculating volt drop to a 3 phase distribution board do I use 230v (11.5v) or 400v (20v) The board I'm attempting to put a cable to is 75 meters away. Design current 100A From TABLE 4D4A Cable selected = 25 mm² For 25 mm²: mV/A/m 1.75 for 230v...
  2. 8

    Domestic: 20A DP switches and ring final circuits??

    Hi all :). Seeing alot of cases where I have seen 20A DP switches in a kitchen (for example) each feeding a radial 2.5t&e to each white goods appilance or similar, and the 20A DP switch primarys are fed from the 32A kitchen ring final circuits - Is this accepteble to BS7671? I'm guessing...
  3. M

    Dedicated ring final used to serve heating panels ?

    Afternoon, here's the proposed setup I am planning to supply 9 off 600w IR heating panels from a ring final circuit the installation is commercial and the panels will be fitted to a suspended ceiling a contractor and thermostat will control the heaters the circuit is fed from a 32a rcbo in...
  4. M

    Ring final end to end test

    As doing a cu change ,I have a ring final in a house with an end to end reading on r1-r2-Rn are so low that somewhere very close under a floorboard the ring must have been connected together somewhere, customer refused to pay more, so i have put in a 20amp mcb. To comply with current rating of a...
  5. Soulsurfer

    Ring final fault.

    Hi I have just looked at a friends place and she asked for a test on the CU as she thought it looked tatty ! It is, ran first ring o.k. Next ring seems to run zig zag fashion up & downstairs and to random outlets like a drunk wired it in ! Problem came when testing end to end I got r1 > 2000...
  6. happysteve

    Current carrying capacity of a ring final circuit - grouping factor?

    Eh up :) I'm trying to challenge myself with scenarios where I'm not sure if my interpretation of the calculation rules + regs is correct or not. RFCs are doing my head in. I think I understand most of the theory: - 433.1.204 lists a specific case where a RFC protected by a 30/32A protective...
  7. A

    2 certs one job

    Hiya From a 3 phase board i have pulled a submain in to feed a 6 way single phase board and wired my final circuits from there. But i have also wired a single radial to feed a socket from the 3 phase board via a rcbo. How do you cater for this lot on test sheets? Would you do a...
  8. J

    ring circuit why ?

    why do people use a ring circuit? i understand that the cable for example 2.5mm twin and earth can carry more current in theory another reason i can think of dont know if its why is the circuit may require a heavy use of socket outlets e.g an office using computers etc... but what other reasons...
  9. A

    2.5mm2 Ring Final Circuit vs 4.0mm2 Radial

    I recently read an article about the advantages of both the RFC and Radial circuits, after which I must admit that I am more swayed towards the Radial. What are others thoughts? What do you prefer and why?
  10. P

    supplementary bonding and rcd protection

    Hi, a recent PIR has picked up no RCD protection and no supplemantry bonding to pipe work. Am i correct in saying if all circuits to bathroom are protected by RCD then supplementary bonding is not required?
  11. S

    Continuity of ring final on radial circuits

    Stuck on Unit 304 Task B, the question states the method on how to carry out a ring final test on a radial circuit. Thanks
  12. whinmoor

    Final Score...

    ... Polys 2 - Monos 6 Amazing scenes this lunchtime in Yorkshire !! I just had to stop the car and take a photo. There were no optimisers or micros on the rails but plenty of dangling cables. I wonder what the householder was quoted for. Why not fit some more to the left of the chimney? No...
  13. happysteve

    IR compliance - trainee (and mentors!) quiz

    Been reading up for my 2394/5 exams next week. Learnt some interesting stuff over the last few days. Thought I'd pose a simple quiz, as this was something that I misunderstood, and I'd be interested to find out if others do too (or if it was just me!) :) Just for fun, trainees and mentors can...
  14. happysteve

    GN3: IR test, whole installation vs final circuit

    Eh up :) Someone tell me where I'm going wrong. I'm reading up on testing theory, using GN3 (6th edition, incorporating Amd 1, 2012). Section 2.7.7, pp40-41. "Simple installations that contain no dist. ccts should pref be tested as a whole, see fig 2.4a." "Test should be carried out with...
  15. I

    Fused spur from ring final for exterior lighting

    Trying to calculate the voltage drop for a run on external lights supplied via 5Amp Fused/rcd spur from local ring final circuit. for a quotation and have got a bit confused re Voltage drop. 27m run in 1.5mm cable total load on lighting radial 420w. (no diversity as all lights either on or...
  16. C

    400v through a ring final circuit

    Hey guys, I had a callout the other day, 7 fan coil units where not working, these where supplied via a ring final circuit and once all unplugged the circuit engaged, I latter discovered all fan coil units had a dead link between line and earth under a 250v insulation test. The manager and...
  17. S

    Ring Final Circuit testing, What is wrong. Trainees only to answer please.

    You have been asked to carry out a full test on a ring final circuit. It is wired in 2.5mm single core cables. (I have made the test result values up to make things easier to work out). You have confirmed that the ring is continuous, and your r1 value is 0.5 ohm, your rn is 0.5 ohm and your r2...
  18. Poult12

    Cup Final

    Time get ready for my u14s youth final. Wish us luck! Bradford Town Youth Panthers Vs Bath Arsenal Chippenham Town Hardenhuish Park 16:30 kick off
  19. uksparks

    NICEIC Certification Scheme NICEIC Form questionH

    On an EIC, be it with whoeverm but using a standard one, or that of niceic online, how or here would I write the details of a control circuit from a time switch to Contactor etc? Or dont you bother?
  20. 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...

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