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EN60335-1 safty standard question

Discussion in 'Electrical Engineering' started by Andy Pichotta, Apr 9, 2008.

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  1. Hello:

    Years ago when I was required to start designing electronic controls
    to meet the EN60335 requirements I was under the impression that I needed to
    have 4000V isolation and at least 8mm creepage AND clearance between any
    high voltage to low voltage.

    When I say high voltage I am refering to120 or 208/230/240VAC
    line voltage. When I say low voltage I mean any circuitry connected to
    secondary side of the power supply transformer where an end user will come
    in contact, like a user interface, say push buttons or temperature sensors.

    More recently a few people have told me that this spacing and
    dielectric strength really depends on the contamination level of the circuit
    board. If it is in a clean environment, you really don't need the 8mm
    clearance. Is there truth to this?

    Thank you,
    Andy
     
  2. Yes I do have a copy of this standard that we purchased a few years back.
    There is a table in there that lists different creepages and clearances for
    different situations, but I have never been quite sure which row in the
    table would apply to the "high to low" situation I refer to in my original
    post. I do know from past experience that if I stay with at least 8mm I will
    not have an issue with this spacing when the board goes out for agency
    approval, but I am never quite sure if I can get by with less spacing.

    Thanks,
    Andy
     
  3. Porky Taylor

    Porky Taylor Guest

    Rubber Gloves!!
     
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