Spur from shower switch
- Thread starter Jupiter01
- Start date
Why can't you use the lighting circuit?
The longer version of this story: the bedroom once up on a time had 4 lights (in 4 corners of room) operates from a single switch. I carved off one of these corners and created an en-suite. One light (this doesn’t have the live feed) has fallen into this en-suite area but you now have to switch all of the lights on/off. Rookie mistake!
I am now planning to redo the tiles in the en-suite and would like to rectify this along with installing an extractor fan.
I have a shower isolation switch on the outside of this wall and was thinking that I can easily pull in a cable from here.
I hope this makes sense.
I am now planning to redo the tiles in the en-suite and would like to rectify this along with installing an extractor fan.
I have a shower isolation switch on the outside of this wall and was thinking that I can easily pull in a cable from here.
I hope this makes sense.
Ok, fair enough.
As you say, install an FCU and run light and fan from that.
Just to allay questions, what is the rating of the MCB and shower?
As you say, install an FCU and run light and fan from that.
Just to allay questions, what is the rating of the MCB and shower?
I will check and confirm but I know it has the thick twin and earth going into this switch and then from here to the shower. I will check the rating tomorrow and get back to you.
Assuming the above checks out, I plan to spur from this shower switch to a FCU (6amp fuse) and then run a light, extractor and the associated switches off this. Am I thinking along the right lines?
Thanks again
Assuming the above checks out, I plan to spur from this shower switch to a FCU (6amp fuse) and then run a light, extractor and the associated switches off this. Am I thinking along the right lines?
Thanks again
Yes, sound good. Easily obtained fuses will be 5A.
The light and fan won't make much difference but it wouldn't be right.
Ok. It's just to make sure you don't already have too big a shower for the MCB.
The light and fan won't make much difference but it wouldn't be right.
Yes, that is correct.
It can be. 1.0mm is more appropriate.
Strictly speaking if shower is 9.5kW or less @ 240V.
10.5kW would be too much for the 40A breaker already and something should be done - not that the light and fan are going to make much difference.
10.5kW would be too much for the 40A breaker already and something should be done - not that the light and fan are going to make much difference.
Yep. 
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You could use 1.5mm between the shower switch and the FCU if you meet the requirements of 433.2.2 or 433.3.
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