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3 Phase Time Switch
Posted 25 March 2011 - 08:32 AM
I'm just about to install a 3 phase 8 Way DB that will feed 4 x 9Kw 3 phase immersion elements.
The customer has asked for each element to be fitted with a time switch.
The elements will be controlled by a 20amp Rotary Isolation switch.
What can I install, and where should it be installed?
The elements are due to be hard wired, but I suppose I could fit a 32amp plug onto the tail?
Posted 25 March 2011 - 10:48 AM
Posted 25 March 2011 - 12:15 PM
Posted 01 May 2011 - 09:38 PM
OK, the plan has changed!
There can be a single timeswitch to control power from main isolator to DB.
What is available out there, that can handle this load?
It also needs to have a manual override to stich the timeswitch off!
Posted 01 May 2011 - 09:59 PM
That way you have to reset it in the event of a power fail.
IF it MUST come back on after a power fail, then use a latching switch in the door?
Just wire the controls for the 4 contactors in parallel feeding each one from the DB?
Put a local isolator at each immersion if the control panel is remote?
Really you need to be able to isolate the panel, though with 4 circuits scrap that!...
Use one timer fed from another db way to run 4 seperate boards similar to the suggestion above?
You could put the timer control in a small enclosure in an accesible area, or even use a domestic timer as you would be just controlling the contactors, then use a box like the suggestion by Benji for each heater just leaving out the timer?
Not really now sure what you are trying to achieve!
It feels tooo late now, don;t know why very tired all of a sudden!
Posted 01 May 2011 - 11:00 PM