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SINGLE PHASE LOAD SHEDDING

John Peckham

I design LV electrical installations including large current hungry domestic installs. I am frequently having single phase supplies upgraded to 3 phase for these houses due to mutiple ovens in kitchens, ASHP, AC units, EV charging etc loads. If I cannot get an upgraded 3 phase supply I want to use load shedding so that the single phase supply capacity is not exceeded. I am looking for a simple 3 phases device with current coils on the supply that will disconect chosen loads. I do not want any fancy electronics or PLCs etc. Can anyone recommend any product on the UK market that will do this.


Thanks

JP

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    Depending on the exact requirements, it is often possible to use "shower priority units" For example, connect an electric cooker in place of the "high priority" shower and connect immersion heaters or space heaters, via a small consumer unit in place of the "low priority" shower. Then, whenever the cooker is in use and drawing more than say 10 amps, the space heaters or water heaters are isolated.

    Multiple units may be used if desired. For example, use of cooker "A" isolates two immersion heaters, use of cooker "B" isolates 5 or 5KW of space heaters.

    EV chargers are available that monitor the total current used by the whole installation, and pause or reduce charging when this current would otherwise be excessive.

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    Depending on the exact requirements, it is often possible to use "shower priority units" For example, connect an electric cooker in place of the "high priority" shower and connect immersion heaters or space heaters, via a small consumer unit in place of the "low priority" shower. Then, whenever the cooker is in use and drawing more than say 10 amps, the space heaters or water heaters are isolated.

    Multiple units may be used if desired. For example, use of cooker "A" isolates two immersion heaters, use of cooker "B" isolates 5 or 5KW of space heaters.

    EV chargers are available that monitor the total current used by the whole installation, and pause or reduce charging when this current would otherwise be excessive.

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