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motor and pumps use 2 x 115 v ac and this is problem

Discussion in 'Sensors and Actuators' started by christos, Sep 9, 2015.

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  1. Tha fios agaibh

    Tha fios agaibh

    Aug 11, 2014
    Not trying to nit pick here, but rather clarify the terms.
    A neutral is not always a grounded conductor. Also, a grounded conductor may not be a neutral. An example where it's not a neutral, is single phase (2 wire)120v circuits.
    The Nec has clarified this since the 2008 code cycle.
    NFPA79 pertains to the wiring inside the machine controls, not the building wiring that we are talking about.
    Obviously, whither or not this conductor is grounded makes a big difference in installation.

    As far as US distinction of "ground", the actual terms are; equipment ground for chassis connection. And grounding electrode for earthing.

    As far a symbols, I would not call one way incorrect. Rather a different way of identifying things.
    Schematics vary greatly depending on what you are looking at and the country of origin.
  2. christos


    Sep 9, 2015
    First of all thank you all for your help . I said before that i will use at line 1 -> 230 vac , line 2 -> neutral and of course i will use and the earth line extra . To be sure i will try this directly to the motors and the pumps .
    Tommorow i will try all of these and i will inform you . After a successfull try ( i hope) , i am sure i will have more questions about the switches system and how i will connect them correctly . It has many relays working with 24 volt with a transformer from 115 to 24 ( i have to change this transformer)
    Thank you all again
    Old Steve likes this.
  3. Tha fios agaibh

    Tha fios agaibh

    Aug 11, 2014
    Good luck Christos.
    Be advised that fusing or overload sizing may need to be changed because your power changed slightly.
  4. Minder


    Apr 24, 2015
    I tend to disagree here, the earth ground symbol is pretty much universal in my experience..
    Here in N.A. in particular, the earth ground is used indiscriminately for both chassis and earth GND.
    The Art Of Electronics by Horowitz and Hill are a particular example of wrong/misleading usage of this.

    Attached Files:

    Last edited: Sep 11, 2015
  5. Tha fios agaibh

    Tha fios agaibh

    Aug 11, 2014
    Minder, I agree with the importance of a chassis ground (IEC symbol) etc.. in electronic circuits, but the scope of this thread was talking about building wiring where the different ground symbols are not relevant. Again, they just spec the electrical prints different.

    Regards, John
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