Posting a message to the forum will remove the above advertisement
  1. angel While you're here, would you mind checking out our Electrician's Insurance section to see if we could save you a few quid? - Specifically our Van Insurance Deals and Public Liability Insurance Deals. Thanks for supporting the forum! angel

Discuss Electrical Assignment Questions Please Help in the Electrical Forum area at ElectrciansForums.co.uk.

Thread Status:
Not open for further replies.
Please make sure you checkout our forum sponsors, many do discounts for members and, they keep the forum free to use.
  1. Steph1321
    Online

    Steph1321 Guest

    Hi I am currently studying a degree in hospitality management and for one of the modules I have to supply answers on some electrical questions I have struggled to find information on some of these questions and I was hoping someone would be able to help?

    The questions I have are:

    1. What sort of consumer unit/fuse box does your establishment have?
    · Is it a ceramic fuse block with different capacity fuse wire fitted?
    · Is it a fuse box with large fuse cartridges instead of fuse wire?
    · An MCB (miniature circuit breaker) style of consumer unit?
    What are the advantages and disadvantages of each type of consumer unit?
    I havent been able to find much at all on the differnent types of unit.

    1. There should also be an overall protection device that will trip all the power in case of a severe problem, this used to be an Earth Trip switch, but in modern consumer units it is an RCD.



    · How does an RCD work?
    · Why might an RCD trip out?
    · Why is an RCD safer than a fuse?



    2. What should you do if an RCD covering the kitchen keeps tripping out on a busy Saturday night?


    2. What colour should the outside sheathing of a PVC ring main cable be under new regulations?

    3. Why does a TV have 3 amp cartridge fuses in its plug but an electric fan heater have a 13 amp fuse?


    4. What would happen if you got them the wrong way round?

    Im really sorry there are so many but any help would be great!!!









     
  2. JASON
    Offline

    JASON Electrician's Arms

    Location:
    Button Pressing
    Hi and welcome :)

    One of the lads will help you out im sure.
     
  3. telectrix
    Offline

    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    same exact questions asked on a thread last week.
     
  4. Archy Styrigg
    Offline

    Archy Styrigg Electrician's Arms

    Location:
    Manchester
    Greetings fella!

    What type of establishment are you talking about?
    Domestic, Commercial or Industrial?
     
  5. Archy Styrigg
    Offline

    Archy Styrigg Electrician's Arms

    Location:
    Manchester
    Must be on the same course.
     
  6. Steph1321
    Online

    Steph1321 Guest

    Commercial it has to be based on my place of employment which is a holiday park. thanks
     
  7. ringer
    Offline

    ringer Electrician's Arms

    Location:
    Peterborough
    answers in black above ^^^
     
    • Like Like x 4
    Last edited: Feb 26, 2012
  8. JASON
    Offline

    JASON Electrician's Arms

    Location:
    Button Pressing
    10 brownie points for Mr ringer :D
     
    • Like Like x 1
  9. Archy Styrigg
    Offline

    Archy Styrigg Electrician's Arms

    Location:
    Manchester
    Good answer from the ringer there!

    To add to why is an RCD safer Q...
    If one touches a Line(live) part, that's only protected by a fuse or MCB, the resistance of your body won't cause enough current to flow to blow the fuse/trip the MCB, so the circuit remains live with possible resulting death if you don't leave contact. An RCD will disconnect the supply within milliseconds @ a current of a few 10s of milliAmps.
     
  10. Archy Styrigg
    Offline

    Archy Styrigg Electrician's Arms

    Location:
    Manchester
    1. There should also be an overall protection device that will trip all the power in case of a severe problem, this used to be an Earth Trip switch, but in modern consumer units it is an RCD.

    Could argue with that one. I would say that the overall protection device would be the supplier's fuse.
    Remember, RCDs are for additional protection.
    '17th edition' CUs are dual RCD because everything has to be RCD protected now (domestic) & to provide some discrimination (RCBOs are best for that).
     
  11. HandySparks
    Online

    HandySparks Trusted Advisor

    Location:
    Hampshire
    Business Name:
    Neish Electrical Services
    An RCD works by comparing the currents in the line an neutral conductors of a circuit (which, under normal circumstances, should be equal) and disconnecting the supply if the difference becomes too high. This would generally be caused by some of the current flowing to earth, for example via your body if you're unlucky enough to be touching a live part. Most, but not all, RCDs are sensitive enough and fast enough to prevent electrocution.
     
  12. supasparxs
    Offline

    supasparxs Electrician's Arms

    Location:
    Leigh, Lancashire
    Hi Steph,
    There are several types of cables that can be used in creating a ring main such as a Twin and earth cable (Like you have in a house), FP200 Gold or generic (generally used on fire alarm systems but can be used for power and lighting), conduit (either plastic or steel) with singles cables within it. In recent years the colour coding of the wiring did change, but the colour of the outer insulation is unchanged.

    I think either the person setting the question could have been unclear.

    The reason why I suspect there is an error is because the outer insulation has not changed colours.

    here is a piece that explains it a bit better

    http://www.******************/Technical/DataSheets/Cable/CableColoursLeaflet.pdf

    If I'm correct about an error the new live cable is brown, neutral is blue and earth core is unchanged as green and yellow

    Richard
     
  13. Archy Styrigg
    Offline

    Archy Styrigg Electrician's Arms

    Location:
    Manchester
    Ring Final Circuit!
    Don't lose marks for incorrect lingo.
     
  14. supasparxs
    Offline

    supasparxs Electrician's Arms

    Location:
    Leigh, Lancashire
    Dependant on the age and the state of the wiring where you are working it's possible to have any of these. I think you should have a look at work tomorrow.

    1) a rewirable fuse is cheap, can be a bit fiddly to rewire, possible to break the fuse-wire whilst fitting, when looking for a faulty circuit you may have to pull fuses that are live, the load the the fusewire will burnout is more of a guide, possible to replace fusewire with a piece of metal which is dangerous.
    2) Cartridge fuses, easier to change, less likely to break whilst fitting, still need to pull potentially live circuits finding the faulty circuit. Cartridge fuse can overload by about 40% than the what is on the side of the fuse
    3) Miniature Circuit Breaker are more expensive, normally work with electromagnetism, to trip at over current, easy to identify which circuit is faulty, easy to reset,

    I hope this helps

    Richard
     
Loading...
Similar Threads - Electrical Assignment Questions Forum Date
Electrical training centers/colleges in Costa Del Sol Non UK Electrical Works Thursday at 11:23 AM
Can I start an electrical company with only Level 2? Business Related Wednesday at 9:58 PM
Thread Status:
Not open for further replies.

Share This Page

Electricians Directory Post a Domestic Job Post a Commercial Job