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  1. Richard Burns

    IP rated switchcover

    Those ones are not particularly waterproof as such, they would stop the switch getting splashed but that is about it. Though they are in general fairly neat. Perhaps the "MK shield" switch cover would be OK rated at IP55, however you would need to open the cover to operate the switch and again...
  2. Richard Burns

    Electrician Jobs Rfc for a newby confirmation please guys

    For a confirmation of an existing ring I would say that in general just measuring the end to end continuity of the ring conductors would show that it is a ring of some sort. To check it is a compliant ring, such as at initial verification, would require the crossover figure 8 measurements but if...
  3. Richard Burns

    LED transformer advice needed

    They would both be OK, the 5V one is a lot more expensive than the one in my link and also larger, I do not think it would be the best choice, especially as the lights may not be quite so bright so you may need to buy a replacement, but that is up to you to select. The ones I linked to have...
  4. Richard Burns

    240v/12v LED strip lighting

    I haven't used the 240V flexible LED strip and would tend to think it would be easier and cheaper to use low profile slim LED under cupboard strip lights instead. However if the customer needs flexible or wants colour changing or such like then you are stuck with it. There should not be a...
  5. Richard Burns

    LED transformer advice needed

    I would expect that the total wattage of each set of lights is 2 W, based on the supplies provided. The 12 V one should not be too hard to find but a 6 V constant voltage power supply might be harder to find as it is not a very standard voltage, you may find a 5V power supply would work just as...
  6. Richard Burns

    end of Chewbaaca??????????

    RIP Peter Mayhew. He worked at the same hospital as my Dad, and when my Dad was rushing down some steps he collided with someone, started to say "Sorry, I didn't see you!" turned around and realised he was looking at Peter Mayhew's chest level and stopped after the "sorry"! OOOOaaahhh!
  7. Richard Burns

    Evening from Burton On Trent

    Welcome to forum, good luck with the course and / or finding an apprenticeship.
  8. Richard Burns

    What is the BS number of the DNOs cutout fuse?

    I tend to record the information as "labelled as" and then specify what is on the carrier. I try and provide as much reasonable information as I feel is useful. However NV would be the most appropriate designation even though it is less informative. If the fuse in the carrier has not been...
  9. Richard Burns

    Wiring extractor fan with timer

    It does not look as if the original fan was wired to be a timer fan just to come on and off with the lights. You could readily wire your timer fan to operate in this way by linking the fan timed line and permanent line terminals. To change to timer function may well be possible but it would be...
  10. Richard Burns

    Body’s resistance with mcb only

    The effects of electric shock are very variable and subject to a whole range of different considerations. The resistance (or impedance) of the body is one consideration but then you have to say where the current travels, hand to foot, foot to foot, hand to hand, head to hand and so on. The...
  11. Richard Burns

    Outside power - shallow depth

    You would want a mechanical digger for solid chalk and it will still take ages. Your method with warning tape would be OK, but T&E down PVC conduit? not the easiest or nicest, I would tend to go for H07RNF flex down ducting. Alternatively you could use cable protection cover boards or strip over...
  12. Richard Burns

    RCD won’t trip help needed

    As far as I can tell you are installing an RCD at the origin of the installation to ensure that on an earth fault the supply will be disconnected within the required time stated in table 41.1. Since this is a TT installation and assumed to be at nominal 230V the disconnection times would be 0.2s...
  13. Richard Burns

    Conductor Operating Temperature H07RN-F

    The 4F... tables are for flexible conductors. If you still want to use rigid conductor cables tables to consider the installation method then at least 70°C tables would be better than 90°C.
  14. Richard Burns

    Fuseboard change advice

    For multicore cables I tend to label the line conductors and then put in the neutral and cpc for each physical cable and then refer to the labelling for each line to place in the OCPDs. However if you have say a small domestic board with cooker, ring, lights on one side and immersion, ring...
  15. Richard Burns

    6 core flex mains and low voltage

    As a resolution could you not just insert a small junction box prior to the plug to allow a short length of four core and two core to exit to the appropriate plugs, though anthonybragg's solution is better in the initial install.
  16. Richard Burns

    Can anyone help with this question?

    My thinking is a safety system is one that is designed to operate in an adverse circumstance, power failure, fire, etc. When setting up a system you need it to work reliably because it may save lives or property. Therefore you attempt to ensure that any problems do not stop it working. If it is...
  17. Richard Burns

    Can anyone help with this question?

    I would agree with Telectrix, if you read chapter 56 in BS7671 this gives requirements for safety services, sources and wiring systems. The question is a bit unclear as it only mentions wiring systems, but if the source for the wiring system and the safety service require a specific protection...
  18. Richard Burns

    Heating s plan testing questions

    When doing the AM2 your initial verification inspection and testing is verifying the accuracy and safety of the fixed wiring up to the SFCU for the heating controls. The wiring thereafter is the control wiring for the heating system. If you are then later in the AM2 doing fault finding on the...
  19. Richard Burns

    Tests prior to RCD fitting

    IR testing L-E and N-E is measuring the resistance to earth. Based on the resistance measured this indicates the current that may flow to earth. Normally the high values of Insulation resistance mean a tiny tiny current will flow to earth, not enough to trip an RCD. The differences between IR...
  20. RCD Trip vs IR.jpg

    RCD Trip vs IR.jpg

    • Richard Burns
    • Media item
    • Comments: 0
    • Category: Electrical Videos

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