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  1. Richard Burns

    breaking capacity of overcurrent devices

    Try table 7.2.7(i) on page 79 osg. 18th blue edition.
  2. Richard Burns

    @ New Trainees.

    Welcome along Zane.C. Good to hear you have been using the forum. I hope It has hehelped your studies and that the learning goes well.
  3. Richard Burns

    The Forgotten Few....

    People come and go, some fond memories, some foul, but in general the forum manages to tick on whoever is on here. The dilution factor can help at times! I am backing off a bit at the moment, but may resurge at a later date. It is nice to have a known person on the forum posting because you can...
  4. Richard Burns

    bloody ads again

    I agree, that is a despicable approach.
  5. Richard Burns

    Urgent call out .....dinner now in the dog

    I get that all the time, call out on Sunday to an urgent problem... Yes it has been playing up for a few weeks but...Oh it went on Monday but...We have had problems with it since we moved in...well it has always been a bit odd but we have friends over tomorrow... Huh!
  6. Richard Burns

    Regs book at office

    I have already mentioned 134.1.1!:wink: But I pressed the agree button for your post but must have missed it!
  7. Richard Burns

    Definitive answer please - EICR

    If you have the competence and experience to correctly and safely complete the inspection and testing of an installation and make a valid and justifiable report on its condition then you are allowed to do this. The legal requirements would come from the Electricity at work Regulations which...
  8. Richard Burns

    Regs book at office

    Cooking loads over 2kW should not be supplied from a ring according to a note in appendix 15, T&E is advised in the ISITEE guidelines as being unsuitable for a use in a plug becauce the cable is not designed for frequent movement. 134.1.1 and 510.3 "shall take account of manufacturers...
  9. Richard Burns

    Overall main switch where the installtion has off peak heating ?

    It is two installations
  10. Richard Burns

    Overall main switch where the installtion has off peak heating ?

    Obviously the ideal is a four pole isolator, however there is some consideration that the post Des56 has just made is the point I was to make! Too slow.
  11. Richard Burns

    When to issue a danger notification?

    Come on, be realistic! how do you fix it to the busbar!!:sunglasses:
  12. Richard Burns

    When to issue a danger notification?

    I did a danger notification for a ring that was pulling 56A and they were complaining of frequent tripping and the RCBO burning out but did not want to split down the circuit.
  13. Richard Burns

    Lighting connection, socket outlet?

    As an easy solution I would tend to put a local fuse in the conduit box so that you only need to add another terminal and fuse holder to the box, if there is enough room. However a plug and socket arrangement should be OK. The instruction that the lights not be connected to the mains supply is...
  14. Richard Burns

    CCTV cable drop

    Calculate for the actual current draw not the absolute maximum, 30 A sounds a lot for 5 cameras but perhaps they are PTZ. Run the cable as a ring if possible to reduce volt drop.
  15. Richard Burns

    New BS5839 regs out now.

    Thank you, Always nice to know there is some use for all the money piling up!!
  16. Richard Burns

    2365 Design Project - May need some advice.

    Well done on the error, it is vital to be able to spot these (and correct them) The diagram and equations are something I have just written/drawn out to provide a total overview.
  17. Richard Burns

    Disconnection times, some clarification

    Yes 411.3.2.2 ii) includes circuits that supply luminaires. Asking if a regulation about circuit disconnection time applies to light fittings is a bit like asking if the price of eggs includes fluffy bunny rabbits! Correct, a circuit containing luminaries in a domestic premises must comply with...
  18. Richard Burns

    2365 Design Project - May need some advice.

    I think you are missing a key point Look at this calculation you typed Max R1+R2 2.73-0.11/1.2x12 = 181.94Ω And compare it to these that you typed 1.37-0.24/1.2*18* 1000 = 52.31m ohms/metre. Maximum Zs -Ze / I3 factor x length overall x 1000 What is the (small but important) difference? I...
  19. Richard Burns

    Wutos

    That is a sad and unfortunate thing to happen. We have been following the delightful rogue for many years and I am sorry that you have now lost him. A memory of loves lost and times past; the thread of memory holds on but the key player has gone to another stage. I wish you well and hope for the...
  20. Richard Burns

    2365 Design Project - May need some advice.

    Come on, remember what units you are working in at each stage. The calculation you show but do not explain seems to show Zs - Ze (1.37-0.24) Adjust for temperature (1.2) as a divisor goes from 70°C to 20°C Circuit length m (18) as a divisor give a value per m Ω to mΩ (1000) as a multiplier to...
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