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  1. I

    Help please. A2/A3 radial circuits

    Hi all. New member, first post. I'm only in training at the moment and i'm a bit stuck. My text books refer to A2 and A3 radial circuits, but for the life of me I cannot figure out what the difference between them is. Can anyone help or point me in the right direction? I would be very...
  2. H

    Lumens per circuit watt

    This is a table showing the lumens per circuit watt ratings of most fluorescent and incandescent lamps:
  3. K

    Merlin gerin type b rcbo

    I installed a ringmain in an office flush in the wall in pvc conduit, tested the circuit and its over the max zs allowed for a type c 32a rcbo. no prob i thought i will get a type b, after searching i cant get one, spoke to merlin gerin they said they dont make them, i said what if my zs is...
  4. W

    Cable length limit from table 7.1

    Evening all Hopeully someone can help me get my head around this. I'm looking at table 7.1 OSG. For the 1361/3036 45A radials on a TN-S system the limiting factor is sc, which means its limited by the line to neutral loop impedance (short circuit). But the TNC-S it isn't. Can't see what the...
  5. R

    sockets for table lamps ??

    Hi all just a quick one, what is the best way to install two sockets in lounge for table lamps only as the owner wants them switched from a double switch plate. do i feed off the downstairs lighting ring and put a fused spur in line before the sockets with a 3A fuse to stop the lighting circuit...
  6. S

    Can anyone recommend a link or website where i can find short circuit capacity table

    Can anyone recommend a link or website where i can find short circuit capacity table for type C MCB's
  7. J

    Volt Drop trouble

    Hi ALL Have to install a Condenser unit on a roof in the nxt couple of weeks the length of run is around 50M the unit FLC is 24A will be Reference method E on Try for most of the run 4mm swa can take 41A table 4D4A and 6mm can take 53A. Just need some advice regarding VoltDrop As this is...
  8. G

    AC table saw motor only seeing 90V across the inputs?

    I bought an old Craftsman table saw (circa 1982) a couple months back and today the motor stopped turning, instead it started just sitting there making an electrical buzz. I've got it apart and all the connections and stuff looked good, so I broke out the multimeter and measured the input...
  9. C

    OSG Final Circuits voltage drop table question

    Just been flicking through and table 7.1 to enable final circuits to be installed without calculating voltage drop has one of the criteria as ii)The final circuit is connected to a dis board or CU at the origin of the installation Just seeing that I understand this and the reasoning behind...
  10. A

    Period Inspection Report - Holday Cottages

    What does anyone think the maximum period between period inspection on holiday cottages should be? Guidance note 3 is not too clear. I'm sure there are many installations which don't drop into the catagories as detailed in Table 3.2 My best suggestion is "Restaurants and Hotels", or...
  11. P

    inserting pictures bs 3036 fuse

    guys, Have a bs3036 main fuse but cannot find anything on it to say what rating it is need help
  12. R

    max Zs for delayed RCD's

    The regs give a table for non delayed RCD's and circuits under 32A, how do you calculate max Zs if there is a delayed RCD or if the circuit is over 32A?
  13. I

    voltage drop

    with the value for volts Mv x Ib x l/1000 7.3 x 39 x 28/1000 = 7.97 V how can i comfirm this value is acceptable??? any help would be great :cool:
  14. K

    RCBO Max Earth Loop Impedance Readings

    Hi all, This is my first post on this forum, so please be easy on me.;) We currently have new Merlin Gerin consumer units installed within Aberdeen College, and looking at table 41.3 b the eli readings should be 0.72 minus rule of thumb. This fails most of the existing circuits. When i...
  15. H

    Voltage drop

    How do we calculate voltage drop on a ring final sockets only, Given the length of the circuit is 40 meters the cable is 2.5mm so therefore the amp per meter is 18, the mcb is 32 so is it 40 x 18 x 32 / 1000 = 23.04 but thats more than 5% = 11.5. Do we not use the mcb for socket outlets as we...
  16. D

    Help Please - max earth fault Loop Impedance value table needed urgently

    Hi everyone Would be really grateful for your help on this. I have my 1st NICEIC assessment on Monday (am bricking it) - anyhow I only have an old table & I need one like you get on the back of the proper NICEIC pads - the most up to date table. Has anyone got one they could send me so...
  17. W

    Earth Loop Impedance Table 17th Edition

    Hi Guys, Here is a handy 17th Edition Loop Impedance Table. This table gives you a direct comparison with your Zs tests results and is calculated @ the 0.8 Rule of Thumb figure. Enjoy! :) Warren

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