Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi all! We have been experiencing an issue on site where threads have been missing the latest postings. The platform host Vanilla are working on this issue. A workaround that has been used by some is to navigate back from 1 to 10+ pages to re-sync the thread and this will then show the latest posts. Thanks, Mike.
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

neutral?

2»

Comments

  • #52
    listermint
    Registered Users, Registered Users 2 Posts: 34,105 ✭✭✭✭listermint


    wotzgoingon wrote: »
    Tomorrow in day light or even now if you have a torch disconnect the two neutrals which I know they are and also the feed and switch wire. Also turn off the electricity by the main switch easier for someone who doesn't know which circuit is which. Then disconnect the two wires in the ceiling light or what ever light the switch activates and short the live and neutral. Then go back to switch and connect the DMM to the switch wire and neutral and set it to beep and it should beep or show a short if you have it set to ohms.

    Now you will know it is a neutral which I knew all along

    Without being funny.

    I wouldn't have you in my house if your not prepared to test things before diving in .

    Rule one


    Never assume anything. Especially with live feeds. Never

    The first man to make bravado assumptions is the first man injured..


  • #53
    wotzgoingon
    Registered Users, Registered Users 2 Posts: 14,309 ✭✭✭✭wotzgoingon


    listermint wrote: »
    Without being funny.

    I wouldn't have you in my house if your not prepared to test things before diving in .

    Rule one


    Never assume anything. Especially with live feeds. Never

    The first man to make bravado assumptions is the first man injured..

    It's kind of funny that you quoted the post where I showed you how to do a basic trace.


  • #54
    gctest50
    Registered Users, Registered Users 2 Posts: 9,605 ✭✭✭gctest50


    wotzgoingon wrote: »
    Also you will never get a shock from a neutral on non RCD lighting circuit. So I do not know where you get this load swinging from....

    wotzgoingon wrote: »

    Also the comment you won't get a shock is true

    You will get a shock, depends on the upstream load swinging out of the neutral



    QcI8kjq.png



    T6JLcDW.png


  • #55
    Tuco88
    Registered Users, Registered Users 2 Posts: 1,053 ✭✭✭Tuco88


    wotzgoingon wrote: »
    Everything its is connected to will stop working. Also the comment you won't get a shock is true but obviously if there was a short you would for the few mili seconds until the breaker tripped.

    Well you're in for a shock when you test that theory.


  • #56
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    gctest50 wrote: »
    You will get a shock, depends on the upstream load swinging out of the neutral

    What happens if the ebay lamp was 1 megohm, what voltage then?


  • #57
    gctest50
    Registered Users, Registered Users 2 Posts: 9,605 ✭✭✭gctest50


    Bruthal wrote: »
    What happens if the ebay lamp was 1 megohm, what voltage then?

    230, then drops depending on the resistance of the boards clown completing the circuit


  • #58
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    gctest50 wrote: »
    230

    How would you know?


  • #59
    gctest50
    Registered Users, Registered Users 2 Posts: 9,605 ✭✭✭gctest50


    wotzgoingon wrote: »

    Also you will never get a shock from a neutral on non RCD lighting circuit.

    Livestream it so

    Connect a 500w lamp to a non RCD supply

    Cut the neutral and hold both ends, one in each hand

    Since you will get a shock or die from this, try contact boards from beyond the grave


  • #60
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    gctest50 wrote: »
    230, then drops depending on the resistance of the boards clown completing the circuit

    Well if it was 100k ohm analogue meter and you test the open points, it will read 21 volts.

    Test with a 5 megohm digital meter, and it will read 191v.

    Which is correct?

    Both really.

    And that is related to these ghost voltages seen with digital multimeters, they are real voltages, but the capacitive coupling that causes them has so high an impedance, that it is not detectable by touch etc, only by very high impedance meters.

    A 2k ohm person in series with 50 megohm cap coupling circuit cap coupled to nearby live circuits (de-energised but near live circuits) , will have almost 0v across them. The meter though, with its multi megohm impedance, can have 20 or 30v or more show on it.


  • Advertisement
  • #61
    wotzgoingon
    Registered Users, Registered Users 2 Posts: 14,309 ✭✭✭✭wotzgoingon


    gctest50 wrote: »
    Livestream it so

    Connect a 500w lamp to a non RCD supply

    Cut the neutral and hold both ends, one in each hand

    Since you will get a shock or die from this, try contact boards from beyond the grave

    Ok I will do it tomorrow, I'm a little busy now. Don't you worry i won't let you down.


  • #62
    2011
    Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,602 Mod ✭✭✭✭2011


    I think this thread has run its course.

    However I think it is important to understand:
    1) Neutrals are not always blue.
    2) Although neutrals should now be blue not so long ago they were supposed to be black.
    3) Regardless what what colour a neutral must or should be some people ignore the rules!

    To illustrate the risk of believing that all neutrals "must be blue" have a look at these examples:

    Example 1 - Here the blue is the 3rd phase and neutral is black. Completely compliant with the rules at the time and still in use today.
    Example 2
    Example 3


This discussion has been closed.
Advertisement