Connections and wiring of Pro 3EM

    • Autor

    Hello,

    I would like to install the Pro 3EM device as I depict in this schematic. Could you please tell me if it is correct and safe?

    • Connect CTC/CTN at the beginning of the phase/neutral wiring distribution of the whole house, to measure the total consumed power in the household
    • Pass the three phase wires of the cooking plate through CTA to measure the total power consumed in the cooking plate
    • Pass CTB through the phase wire of the fridge
    • Integrate the generated power from the solar panels of collected by Shelly 1 PM into the ShellyApp to know the balance of generated and consumed power

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    Many thanks in advance

    You must connect terminals A and B of Shelly pro 3EM with the same live wire as terminal C to get correct results. The current transformer at neutral wire (IN) is obsolete. It will render the same current as IA, but no power or energy.

    Operate the Shelly pro 3EM in Monophase mode.

    „Habt Geduld. Alle Dinge sind schwierig, bevor sie einfach werden!“ (aus Frankreich)

    „Nothing in life is to be feared, it is only to be understood.“ (Marie Curie, 1867-1934)

    „Comment is free, but facts are sacred“ (C.P. Scott, britischer Verleger)

    • Autor

    Thank you thgoebel for the quick response!

    What you suggest is that I leave out the other two measurable phases of A and B, and only measure one phase and current with C. Did I understand it correctly?

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    Is it then not possible somehow to use phases A and B connected to the same live wire of C? I cannot think of any practical connection for this.

    Thank you

    I think your choice of words does not match the drawing. I can only see 1 phase there, so to be on the safe side:

    Is your installation single-phase or 3-phase?

    Überwiegend PRO 3EM im Einsatz zur Haus und PV Überwachung

    Zitat von Victor!

    Did I understand it correctly?

    No. Your sketch depicts a one-phase system with three points of measurement. Thus, each voltage terminal of Shelly pro 3EM has to be supplied with the (one) live voltage. Otherwise, channels A and B don’t give power and voltage figures.

    „Habt Geduld. Alle Dinge sind schwierig, bevor sie einfach werden!“ (aus Frankreich)

    „Nothing in life is to be feared, it is only to be understood.“ (Marie Curie, 1867-1934)

    „Comment is free, but facts are sacred“ (C.P. Scott, britischer Verleger)

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