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set up for immersion goes like this for me....

Option 1) 16amp breaker > 2.5mm t&e to 20amp DP isolator > flex from this to immersion.

But how is this set up.....

Option 2). 16amp breaker > 2.5mm t&e to 13amp fcu > flex from this to immersion

Are both fine?
 
If domestic no requirement for local isolation if on its own dedicated circuit.
 
Hi - Local 20A DP switch for immersion isolation is appropriate IMHO as work may be done in the vicinity by someone not familiar with boards etc. I use 2.5mm from the board as it has margin for installation Method 103 worst case.
 
Hi - Local 20A DP switch for immersion isolation is appropriate IMHO as work may be done in the vicinity by someone not familiar with boards etc. I use 2.5mm from the board as it has margin for installation Method 103 worst case.

So, good practice but not required.
 
What do the manufacturers instructions say? Or is this a theoretical question? Local DP switch for me also. If the voltage fluctuates that fcu will die. Seen it happen so many times. Also the local isolation helps Mr wet pants who’s either too stupid or too lazy to isolate elsewhere!
 
What do the manufacturers instructions say? Or is this a theoretical question? Local DP switch for me also. If the voltage fluctuates that fcu will die. Seen it happen so many times. Also the local isolation helps Mr wet pants who’s either too stupid or too lazy to isolate elsewhere!

Would you agree no actual requirement for local isolation
 
Local isolation is safer for anyone else working on the immersion heater in the future and also makes it easier for testing in the future.

A local isolator which is effectively under the constant supervision of the person doing the work is a safe isolation which doesn't rely on them having a lock off kit which many domestic workpeople don't. Also most circuits are rcd protected these days so the local dp isolation prevents tripping the rcd when N and 3 touch whilst working on the immersion.

And for testing the DP isolation allows you to test a suspect immersion heater without having to disconnect the neutral somewhere.
 

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