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    V-phase

    This is not the correct way of looking at it. It is not the power consumption (or wattage) that is fixed, but rather it is the resistance that is fixed.The power rating is merely the power that will be drawn at a particular voltage. If you reduce the voltage, then you also reduce the current...
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    Re: 4mm resistance

    There are several different tests that measure impedance. You could be thinking of Zs (earth fault loop impedance). The max Zs for a circuit depends on the fuse or circuit breaker protecting that circuit. For example, the IEE On Site Guide says that a circuit with a B32 breaker has a max Zs of...
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    Push in mcb

    Both makes are type B, 3kA.
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    Push in mcb

    Wylex push in MCBs are cheaper from Electricfix, £6.53 incl VAT, making them a few pence cheaper than Toolstation's GE versions. The Wylex MCBs come with their own backplate as they don't fit into the original rewirable backplates. With GE, the backplates are appear to be extras. I don't know...
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    Cal Checking Your Test Instruments

    Where can you buy a CalCard for less than £21?
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    Ge mcbs volex mcbs wylex rcbo

    If it's a GE board then why not fit a GE RCBO? Tool Station sell them with free next day delivery. Or follow Pevvers' suggestion.
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    number of points served

    According to Kitcher in 'Practical Guide to Inspection, Testing and Certification of Electrical Installations', Just realised that this isn't asked for on the IEE forms, so it doesn't feature in the OSG or the regs.
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    number of points served

    The way I've looked at it is that a switch is: another point to be earthed another point where tests can be taken another accessory for the customer to choose I thought that the number of points was recorded for the benefit of the next electrician to work on the circuit. What if a circuit has...
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    Zs on a ring question

    I thought that when Solo suggested checking spur connections he may have meant checking where the spurs are tapped into the ring. Getting three wires neatly into a terminal can be more fiddly than just the standard two. Also, faults on a circuit are more likely to be found where it has been...
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    number of points served

    I would count a 2g switch as 1 point. The wires are taken to one point in the building, there is one point to open for testing and there is one electrical accessory there (the switch). If the light switch includes two circuits, eg hall & landing lights, then I would count it as a point on each...
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    Accessible or not?

    The connection onto the oven itself is on the back of the oven, so the wall connection is no more or less accessible than this.
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    bathroom lights

    As Jason said, it will probably be possible but check with your electrician. There are two ways to connect the light. One is with a permanently live supply and a small pull cord on the mirror light. The other is to have it coming on with the ceiling light. Decide which you prefer, buy the...
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    Technical Guidance Doccument Part M Draft 2009

    I noticed that the document relates to the building regs in the Republic of Ireland.
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    Cross Bonding

    This is what the ESC & others have to say about supplementary bonding at boilers: New or Rewired Domestic and Similar Installations, Question 6
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    Socket Heights in New Extensions

    If this project is to be inspected by the local building inspector then I would suggest that it is worth asking him first before fitting the sockets & switches outside of the disabled zones.
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    missing earth

    When asked about taking the cpc from a nearby socket circuit, I assumed it was from a ring. If, on the other hand, the second circuit is a radial then to come from this circuit instead of from the CU would only be extending the radial. It's perhaps not good practise to split a radial into 2...
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    missing earth

    One option would be to disconnect the radial at the CU and supply it via a fused spur from the ring. This may not be ideal but it could be the only alternative to some more extensive rewiring. If you are considering replacing the just cpc then is it worth completely replacing the twin & earth...
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    Diy tt ??

    It may have been worth checking Zs at a few sockets while you were there. To measure Ze you presumably picked an earth wire from the jumble and measured the resistance to earth of that wire on its own. There may still be other connections to earth, including the bonding. Obviously this would not...
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    2391-10 inspection and testing

    If you look on the City & Guilds website and find the course, you can get a list of all the colleges and training companies in your area eligible to run the course.
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    Testing lighting circuit with no CPC

    Thanks, I have already seen the ESC guide but it doesn't give much info on testing or filling out a minor works cert. I understand that ideally you would rewire, but failing that you should remove metal (class 1) fittings. I just wondered if anyone had any suggestions or tips for the testing and...

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