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Thread: Not to be done at home boys and girls

  1. #1
    Join Date: Jul 2011

    Location: London

    Posts: 713
    I'm Colin.

    Red face Not to be done at home boys and girls

    A experiment, NOT TO BE DONE AT HOME BOYS AND GIRLS
    I got some of the EWA IC cable which has four conductors and a shield,
    Tested the break down voltage at 2500VAC between all.
    OK the wire could handle about 3Amps max.
    Made a simple cheap and nasty MK plug and Bulgin IEC lead 2 M long.
    And tried it on the New Oberon I have, based on the M50 and M50P mixed (only 3 ever made cost to high)
    We have one my sons Sam and Scott have one each.
    It was fantastic the cheapo Woolworth IEC was crap in conclusion.
    Just a fun and dangerous things to do under lockdown.
    Still waiting for Solar Panel from space Mike, phew

    Keep well all.

  2. #2
    Join Date: Feb 2010

    Location: Moved to frozen north, beyond Inverness

    Posts: 1,810
    I'm Dave.

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    Quote Originally Posted by Colin Wonfor View Post
    A experiment, NOT TO BE DONE AT HOME BOYS AND GIRLS
    I got some of the EWA IC cable which has four conductors and a shield,
    Tested the break down voltage at 2500VAC between all.
    OK the wire could handle about 3Amps max.
    I don't quite understand how you could do this. Do you work for the National Grid or similar?

    Also, if you tested a cable at 2500V to breakdown, did it end up as a smouldering snake or a piece of shrivelled up carbon?

    At least doing this sort of thing to a Wooworth (do they still exist - surely not ...) wire would be less expensive, even if that also resulted in a burnout
    Dave

  3. #3
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 5,535
    I'm Alan.

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    Quote Originally Posted by dave2010 View Post
    I don't quite understand how you could do this.
    There are plenty of insulation testers that can test at 1000V. A PAT machine possibly tests at 2500V, I have one somewhere but can't bring the figure to mind immediately.

  4. #4
    Join Date: Feb 2010

    Location: Moved to frozen north, beyond Inverness

    Posts: 1,810
    I'm Dave.

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    Quote Originally Posted by Firebottle View Post
    There are plenty of insulation testers that can test at 1000V. A PAT machine possibly tests at 2500V, I have one somewhere but can't bring the figure to mind immediately.
    Do these work non-destructively? I'm not sure of that.
    Dave

  5. #5
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 5,535
    I'm Alan.

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    Yes they do, the current on fault is very low.

  6. #6
    Join Date: Jul 2011

    Location: London

    Posts: 713
    I'm Colin.

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    Dave I designed and made in the past PSU's at 150KV at 1A and 55V at 100KA so 5KV at 10mA is bit of cake.
    Cable insulation is PTFE and in three layers so no problem It did survive 5KV and the current leaking was just 1mA.
    So no cable fried or smoked or vaporised or was harmed in this test, so do not call out RSPCC out.

  7. #7
    Join Date: Jan 2009

    Location: Essex

    Posts: 23,466
    I'm openingabottleofwine.

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    I have made mains cables using twin core screened cables. Tested using a 1kV Megger, they had an insulation resistance of > 3 GOhm.
    Barry

  8. #8
    Join Date: Jan 2008

    Location: Gerrards Cross

    Posts: 2,605
    I'm Tony.

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    I have several of these types of units for various cable testing along with a VNA, for this type of general cable safety testing work Kikusui are first rate quality.

    https://www.telonic.co.uk/Kikusui-TO...-p/tos5302.htm
    Coherent Systems
    Real high end sound with musicality not hifi

  9. #9
    Join Date: Jul 2011

    Location: London

    Posts: 713
    I'm Colin.

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    Thanks Mr.C

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