tt system type s rcd

Discussion in 'Electricians' Talk' started by EZwire NE, Nov 25, 2006.

  1. EZwire NE

    EZwire NE New Member

    what is the time delay on the 100 ma type s rcd ?
  2. 2 wheeled ant

    2 wheeled ant New Member

    450ms max, it only has to be time delayed if its used as main switch.
  3. markysparky

    markysparky New Member

    It can vary depending on what make you get.

    But all S types should trip out no less than 300ms to allow discrimination between the 30ma RCD and no more than 500ms to keep within 7671.

    Hagar is normally about 350ms and the last MK one I installed tripped out at 497ms :)
  4. electric dave

    electric dave Member

    A bit off subject, what sort of values do you get when testing earth rods/tapes etc for Ze for your area?
  5. markysparky

    markysparky New Member

    It really can vary on the ground itself. Clay, sand, granite.

    Last 2 I done I got around 11 for one on the 1st attempt. Another I spent half the day just getting it to about 45.

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