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  1. W

    using 1 way rcd protected mains unit as a rdc protected spur

    I have been asked to install a supply a feed to a water pump which is located underneath a bath. The idea is to feed this using the up-stairs ring which unfortunately isn't rdc protected. I know that rcd protected switched spurs are available, but have unfortunately not been able to get hold...
  2. W

    earth cable c.s.a

    Can somebody tell me why the earthing tail is smaller in c.s.a than the phase and neutral tails (from the main head)? Should they ideally all be the same diameter?
  3. W

    neutral as an earth

    In PME, neutral is connected to earth. Why can't you use neutral to provide earthing in domestic applications, ie, earthing metal socket boxes with a link to the neutral? Why is there a need for a separate protective circuit?
  4. W

    replacing older consumer units with split load boards

    I have just fitted a split load board to replace a unit that is probably about 15 years old (mini trips) for a house that has recently been extended. The new circuits for the extension have been connected to the unit without fault. However, upon adding the existing circuits, the RCD trips when a...
  5. W

    spur questions

    can you wire a spur from a spur from a spur? can you wire more than one spur from a single double socket, ie, two spurs directly from a single double socket?
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    two way/intermediate lighting

    The method i have been taught for 2 way/intermediate lighting is to have a switch line (twin and earth) and a length of three core connected to a 2 way switch, then a length of three core to an intermediate switch, and finally a length of three core to a second 2 way switch. Does it matter as to...
  7. W

    lighting circuits type

    I know that there are two main lighting circuit methods - junction box and loop systems. Do you use one or the other in a single circuit, or can you use a combination of the two? What is the common practice? For example, if two rooms had down-lighters and two rooms a central ceiling rose could...
  8. W

    circuit consumption calculations

    This is my first time so be gentle! How do you calculate the demand on an electrical circuit so that you can determine the correct cable size? . I have been asked to cable the lighting circuit to an extension which consists of 2 rooms - bathroom and bedroom. The bathroom will have 3 50w...
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