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Hardware Thread, PAT testing network switches in Technical; Point of Interest. When I was a Electrical Apprentice (a long time before the PAT tester ) you used a ...
  1. #16
    tickmike's Avatar
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    Re: PAT testing network switches

    Point of Interest.
    When I was a Electrical Apprentice (a long time before the PAT tester ) you used a 'megger', we used a 5000 volt one to do some tests and as apprentices you bet your mates how long you could hold the leads and turn the handle (I know now why I have no brain) it made you eyes light up !!!.
    I still have one of the older ones of my fathers from the second world war and it still works, its got a handle on it you turned to generate the voltage to do the test and a meter scale on the top which is calibrated in meg ohms.
    After them you had the battery powered 'megger' .

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    Quote Originally Posted by tickmike View Post
    I was horrified when I went along to the charity run school I look after today and found that someone had P.A.T. tested all the IT equipment without asking my advice first.(strong word with the head needed !) Being a fully qualified Electrician I understand what can happen to sensitive electronic equipment .
    What the 'PAT' tester does is to apply Twice the operating voltage eg. for 240/250 volt.50 hz equipment so 500 V .DC. would be applied across :-
    say if you tested an IEC lead
    a.. 500V live to neutral conductor.
    b.. 500V live/neutral to earth .
    c.. current of about 20 amps from one end of the earth cable to the other eg. mains plug to IEC socket.
    You would also check to see if the mains plug fuse is of correct size, all terminals are tight,any damage to equipment or leads etc.
    When I worked in a research lab I looked after and I tested many electrical items and the major problem was poor earths eg. the earth lead from the mains lead connected to the equipment chassis strait on to a painted surface.
    Items with surge suppressors in can be damaged.

    Test the leads only.
    Fully agree with what could happen to a PC with 500Vdc to a PC but any PAT tester worth his salt will test all full voltage PC's.... having said that though if you are only testing the IEC lead then you are not fully ensuring the equipment has a correct earth bond, this should be an instant fail for a class 1 PC as you have only carried out half the test. Dependent on the PAT tester used, there should be the facility to reduce the current to 100mA for Class 1 IT Equipment, my Seaward has inbuilt preset tests which include the 100mA drop and has never popped a PC yet.

  3. #18

    plexer's Avatar
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    6 year old thread

    Ben

  4. #19
    sparky2488's Avatar
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    Quote Originally Posted by plexer View Post
    6 year old thread

    Ben
    Ha ha . . . didn't even notice that

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