Star-Delta Motor Starting - Performance


Many questions sent in to the site are in connection with motor starting and in particular star-delta.  For all but the simplest application, there is merit in performing a more detailed study.  Carrying out a software study allows both the electrical performance and that of the connected mechanical systems to be evaluated......Read More..

By Steven McFadyen on Thursday, July 10, 2014

IEC 60287 Current Capacity of Cables - An Introduction


IEC 60287 "Calculation of the continuous current rating of cables (100% load factor)" is the International Standard which defines the procedures and equations to be used in determining the current carry capacity of cable. The standard is applicable to all alternating current voltages and direct current cables up to 5kV......Read More..

By Steven McFadyen on Thursday, January 31, 2013

Electromagnetic Fields - Exposure Limits


Exposure to time varying magnetic fields, from power frequencies to the gigahertz range can have harmful consequences.  A lot of research has been conducted into identifying these effects and developing recommended safe exposure limits....Read More..

By Steven McFadyen on Saturday, June 28, 2014

Community Activity

Steven McFadyenNotes discussion - please restrict comments to asking for clarifications on the note or adding value to the topic. If you are looking for help with a general question, please use our questions section.
Don't forget to search the site first; the answers may already be available.

1 day ago

    naban asked the question lightning and grounding

    1 month ago

    ram31 voted for Power Swing

    This answer is useful

    1 month ago

    ram31 commented on Arc Flash

    1 month ago

    myElectrical Tools

    myElectrical Tools

    We have tools to help.  Our tools range from assisting with basic calculations to IET compliant cable sizing. Feel free to browse and try. 

    Units Conversion
    Complex Number Calculator
    3-Phase Calculations
    IEE Cable Sizing
    Circuit Protective Conductor
    Power Factor Correction

    even more tools...




    Notes is a collaborative collection of electrical engineering information and educational material. Why not consider adding your knowledge and help make a better Notes for everyone.

    Have something interesting to share or some hidden knowledge why not add a post. Sharing your thoughts and ideas is a great way to pass on knowledge.  Who knows you may even become famous along the way. 

    Learn More

    Contribute - Questions and Answers


    Have a question. Care to help by using your expertise to answer. Contribute to our questions and build up your reputation.

    It's quick and easy to ask or answer questions. Why not give it a try.

    Learn More

    Latest Questions:

    1. Lightning and Car Alarms
    2. Power Transformer Temperature Measurement
    3. Voltage Conversion
    4. Arc Flash
    5. Voltage Transformer
    6. Earth Leakage Protection for 3 Phase Motor (Rating < 5.5kw)
    7. Power Swing
    8. Grounding Transformers above Ground Level

    most popular notesMost Popular Notes:

    newsletter logo

    Our Newsletter

    Receive updates on new posts by email
    down arrow
    Our website uses cookies so that we can provide a better experience.
    To learn more about what cookies are and how to manage them visit