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Thread: Mains power meters

  1. #1
    Automated Home Lurker
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    Default Mains power meters

    Hi.
    I have some non invasive clamp on power meters that I use to read mains current. I wanted to put one on each ring mains in my house so I can see localised power consumption.

    Something I don't understand is, if I put a clamp meter on single ring mains what stops me sensing the current on all the other ring mains for the entire house? Will I sense current beyond the MCB isolating that ring?

  2. #2
    Moderator toscal's Avatar
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    Interesting.
    I know when you are testing a single ring circuit you are supposed to turn off the others, to avoid for want of a better word cross contamination. One way would be to put in a din rail mounted energy meter after the circuit breaker for the ring, then clamp on the output side of this. Or use the blinking led to measure power consumption.
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  3. #3
    Automated Home Legend paulockenden's Avatar
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    You only sense the current passing through the clamp or CT.

    Think of it a bit like measuring water flowing through a pipe and it might make more sense.

    Ring mains make things complicated.
    Last edited by paulockenden; 21st June 2019 at 02:09 PM.

  4. #4
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    Quote Originally Posted by paulockenden View Post
    You only sense the current passing through the clamp or CT.

    Things of it a bit like measuring water flowing through a pipe and it might make more sense.
    Ah! This explains why you only receive an appliances power usage as the power cable is basically a spur.

    Thanks for the help.

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