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  1. Peter Monfort

    Ring final with 4mm legs

    It would surely have been better to make it into two radials. These could have been supplied by two 4mm^2 radials and the 2.5mm ^2 could have been arranged in a variety of Spurs or radials. I think this circuit is more commonly known as a tree in other countries. It would also simplify...
  2. Peter Monfort

    Running cable through a switch back box

    I did I digital search of the GN1 and can't find anything that says it isn't permitted either. But that doesn't make it sensible.
  3. Peter Monfort

    Running cable through a switch back box

    I tend not to do this. The cable takes up space in the back box and can be awkward when fitting your face plate. There is also a risk that t when screwing in the face plate the small threaded screws can pierce the cable. It would also not likely be able to move if the screw did make contact...
  4. Peter Monfort

    D.C. Motor theory.

    The field can be considered to be constant since it is separately excited. The speed of a dc motor is proportional to back emf / flux i.e Eb / φ so if the field and therefore flux is reduced the speed will rise. Here is a useful link...
  5. Peter Monfort

    Ring final circuit question

    I Sussed it. if you do it the correct way L1 to N2 and L2 to N1 you effectively create two identical loops. Taking a reading at any socket effectively measures the resistance across two loops of equal length in parallel. So using the equation for resistances in parallel the resistance will...
  6. Peter Monfort

    Ring final circuit question

    Hi Yes...in training. I understand why they should be the same reading. but what happens if you connect L1 to N1 and cross connect L2 to N2? the readings change then don't they? Why is this?
  7. Peter Monfort

    Ring final circuit question

    When you do the continuity test on a ring final circuit and you have to connect L1 to N2 and vice versa, this assumes you know which L cable is the incoming or outgoing. I understand that if you connect L1 to N1 and vice versa the ohm readings rise then fall as you go round the ring circuit...

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