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  1. 3phasemike

    FREE IEC ELECTRICAL SYMBOLS

    thanks for your surgestions, have checked them out but 1 want to keep using AutoCAD 2002lt, need symbols in blocks with editable attrubutes, have started drawing up one at a time but someone elses libary of symbols with attrubutes already added would be better. thanks for your help thus far Mike
  2. 3phasemike

    FREE IEC ELECTRICAL SYMBOLS

    Hi can you guys point me in the direction of free IEC electrical symbols, I've checked a few sites out and haven't been able to find just what I'm looking for. really wanting to set up a drag and drop system within AutoCAD 2002 LT, have found a few packages but don’t want to purchase / purchase...
  3. 3phasemike

    Tuned Filter for Specific Mains Voltage Frequency

    Thanks all for you suggestions, since posting this I have further information. The local authorities method of generation is via an 3 phase induction motor, this has, by its nature an a mount of slippage, resulting in a generated frequency of "about 1042Hz", the resultant beat...
  4. 3phasemike

    Tuned Filter for Specific Mains Voltage Frequency

    Help, We are trying to filter out a switching frequency (used to switch street lighting and control domestic hot water), we have some electronic lighting dimmers (echelon network based) that are being affected by the previously mentioned "ripple" frequency (the lights they control are...

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