massive electricity bills (Fusion) electric wet heating system

Discussion in 'Electricians' Talk' started by Margaretk76, Apr 4, 2016.

  1. Lectrician

    Lectrician Screwfix Select

    They only need to measure the current in the live (or lives). The neutral current is not needed. If you open a meter, the middle two terminals are just a block with a tiny little connection for voltage measurement. In fact, on older installs, where the meter was remote, it was common to run two full sized lives and a single smaller neutral. Not done these days.

    11,000v metering is done with VT meters reducing the voltages to 110v, but as 11,000v is delta, only two phase need to be connected, the third can be calculated by the meter.
    madhatter1uk and FatHands like this.
  2. stateit

    stateit Screwfix Select

    A bit like The Numskulls, Handy. There's a couple of little blokes in there. They take it in turns. One using the abacus and notepad, the other making cups of tea and small talk to keep the other one awake.
    madhatter1uk likes this.
  3. fire

    fire Well-Known Member

    Load in a new electricity meter is just an ammeter. The same as the clamp type placed on the Line conductor. It measure the current draw and has the inbuilt firmware into a Motorola, Texas instruments or Broadcom processor to calculate and display the usage. Very basic low end CPU with firmware.

    The old meters used an field motor, the more current draw the faster the motor turned which mechanically counted up the usage on the dials.

    It really is just a ammeter and some software to convert current usage into KWH referenced against the current voltage supply.

    @Lectrician You forgot about the big relay used to remotely disconnect the supply as they see fit(new smart meters) and for pre-pay it just disconnects based on software commands either from the ROM or by the RF handheld device.

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