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Shower priority control, for 2 out of 3.

broadgage
Does anyone make a shower priority control for THREE showers, that permits of any TWO showers being used at the same time, but NOT all three.

3 phase 100 amp supply. Showers each 40 amps.


L1-----------3 showers, showers one and two to take priority, shower three disabled if BOTH the others are in use, but permitted if only one other is in use.

L2------------as L1

L3-----------2 showers, either or both can be used, but if both are in use, the output intended for the third shower is turned off, this to supply immersion heaters.


I appreciate that one would probably "get away" with 3 showers each of 40 amps, on a 100 amp supply, but in this case with significant other load I am a bit uneasy about two showers, three no way!  This is an existing installation with a history of operating the cut out fuses.


The water supply is confirmed as ample, boosted supply from a large cistern.
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  • 0
    Sounds like you want a full 3 way Non-Priority setup : no one has priority, 1st come 1st served


    Have you considered a 2 way non-Priority board, and a main always available (i.e. a priority)

    That way, you still get the 2 out of 3, just not the 2 lower priority units at the same time.


    Else maybe speak to Garo or similar, to see if they will build you one.

    Gotcha is the need for 2 pole Priority relays - and not seen those in a quick google.

    (so 3 times each of Switched outputs put in series of the other 2 Showers' disabling contactor)

    i.e. you need to votes of cutoff to actually cutoff,

    OK, you can apply similar logic and have two disabling contactors in parallel ... but that means 6 not 3 of those.



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  • 0
    Sounds like you want a full 3 way Non-Priority setup : no one has priority, 1st come 1st served


    Have you considered a 2 way non-Priority board, and a main always available (i.e. a priority)

    That way, you still get the 2 out of 3, just not the 2 lower priority units at the same time.


    Else maybe speak to Garo or similar, to see if they will build you one.

    Gotcha is the need for 2 pole Priority relays - and not seen those in a quick google.

    (so 3 times each of Switched outputs put in series of the other 2 Showers' disabling contactor)

    i.e. you need to votes of cutoff to actually cutoff,

    OK, you can apply similar logic and have two disabling contactors in parallel ... but that means 6 not 3 of those.



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