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Immersion switch question - why L-Out to COM ?

  • 28-02-2021 11:15am
    #1
    deadl0ck
    Registered Users, Registered Users 2 Posts: 4,196 ✭✭✭


    Hi all,
    I had to put in a new immersion switch as my old one seems to have burned out (switch is physically stuck)

    Anyhow the old switch was very straightforward but in the newer one I have to Connect L(Out) to COM and then take the bath and sink out the L1 and L2 connections

    What's the purpose of having to join L(out ) to COM ? The old switch just "assumed" this and you didn't need this extra wire.

    I understand why I have to join them in order for the switch to work, but my question is why bother with this extra wire when it could have just been built into the switch ?

    Here's the Old Switch:
    5EaRRwjb.jpg

    and here's the new one:
    Um3rIvkb.jpg
    Tagged:


Comments

  • #2
    alan4cult
    Registered Users, Registered Users 2 Posts: 1,583 ✭✭✭alan4cult


    This came up on another thread. There are two reasons I can think of right now.

    Live out can go to a timer before it goes back to common. That way you have isolation of the timer and isolation of the immersion. Other configurations cannot isolate the timer.

    Live out can go straight to an immersion, useful when you only have one element, the bath sink switch then is irrelevant.


  • #3
    deadl0ck
    Registered Users, Registered Users 2 Posts: 4,196 ✭✭✭deadl0ck


    Ahhhh......Makes sense - thanks !!


  • #4
    Detour.
    Closed Accounts Posts: 34 ✭Detour.


    alan4cult wrote: »
    This came up on another thread. There are two reasons I can think of right now.

    Live out can go to a timer before it goes back to common. That way you have isolation of the timer and isolation of the immersion. Other configurations cannot isolate the timer.

    Live out can go straight to an immersion, useful when you only have one element, the bath sink switch then is irrelevant.

    Those are not relevant or valid reasons at all

    Isolating timers ? and single immersion heaters


  • #5
    alan4cult
    Registered Users, Registered Users 2 Posts: 1,583 ✭✭✭alan4cult


    Detour. wrote: »
    Those are not relevant or valid reasons at all

    Isolating timers ? and single immersion heaters
    Single immersion heater has one element not two and therefore does not require the bath sink switch.

    How would you isolate an immersion timer without access to common terminal?


  • #6
    Detour.
    Closed Accounts Posts: 34 ✭Detour.


    alan4cult wrote: »
    Single immersion heater has one element not two and therefore does not require the bath sink switch.

    How would you isolate an immersion timer without access to common terminal?

    How do you isolate a light switch, how do you isolate a 13amp double socket ?

    Bath/Sink is irrelevant it's not the appropriate switch for a single immersion heater

    Not having a go, just correcting the record for accuracy.


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  • #7
    alan4cult
    Registered Users, Registered Users 2 Posts: 1,583 ✭✭✭alan4cult


    Detour. wrote: »
    How do you isolate a light switch, how do you isolate a 13amp double socket ?

    Bath/Sink is irrelevant it's not the appropriate switch for a single immersion heater

    Not having a go, just correcting the record for accuracy.
    So what is the common terminal for in this scenario?
    I have always wired the timer downstream of live out but maybe I need to check regs on this one.


  • #8
    Detour.
    Closed Accounts Posts: 34 ✭Detour.


    alan4cult wrote: »
    So what is the common terminal for in this scenario?
    I have always wired the timer downstream of live out but maybe I need to check regs on this one.

    You shouldn't , you're breaking the supply to the clock doing that

    The dual -immersionn switch is for control and isolation of the heater


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