Boards.ie uses cookies. By continuing to browse this site you are agreeing to our use of cookies. Click here to find out more x
Post Reply  
 
Thread Tools Search this Thread
25-12-2009, 21:36   #1
mistermarantz
Registered User
 
Join Date: Dec 2009
Posts: 29
Electric shower correct MCB and cable size?

I have an old 8.5KW Triton electric shower for the last 10 years which needs replacing. I have bought a new 8.5KW electric shower and I'm hoping someone can help me.

I read the instruction manual of the new shower and it recommends a 10mm cable and a 40 amp MCB for showers over 8KW

I checked the set up of my old shower and it was wired with 6mm cable and the fuse box has a B32 amp MCB. The shower is approx 4m away from the fuse box.

Even though my old shower has worked fine for the last 10 years, can someone please advise me if the correct cable and MCB was installed from day 1??

Is 6mm cable and a B32 MCB safe for a 8.5KW shower??
mistermarantz is offline  
Advertisement
25-12-2009, 21:39   #2
Woddle
Closed Account
 
Join Date: May 2006
Posts: 6,471
In my opinion the 6sq is fine but I would change the 32amp mcb to a 40 RCBO.
Woddle is offline  
25-12-2009, 21:44   #3
Avns1s
Registered User
 
Avns1s's Avatar
 
Join Date: Jun 2006
Location: Mayo (80m / 262ft ASL)
Posts: 2,784
I agree, the 6 sq. should be fine for a short run like that. But I would change to the RCBO as Woddle says.
Avns1s is offline  
25-12-2009, 21:47   #4
mistermarantz
Registered User
 
Join Date: Dec 2009
Posts: 29
Folks, thanks for your help

Whats the difference between a MCB and a RCDO?

Also, what does the "B" in B32 mean?
mistermarantz is offline  
25-12-2009, 21:48   #5
davelerave
Registered User
 
Join Date: Feb 2003
Posts: 1,705
Ya.cables fine for 8.5kw at 4metres but change to 40a rcbo.Might need a small rewire if the existing 32 is already fed via an rcd .
Get a sparkie to test wiring at shower when finished
davelerave is offline  
Advertisement
25-12-2009, 22:00   #6
davelerave
Registered User
 
Join Date: Feb 2003
Posts: 1,705
The rcbo combines the overload/short-circuit protection of an mcb with the earth-leakage protection of an rcd.The 'B' denotes the magnetic tripping characteristic and is the type you need for shower
davelerave is offline  
Post Reply

Quick Reply
Message:
Remove Text Formatting
Bold
Italic
Underline

Insert Image
Wrap [QUOTE] tags around selected text
 
Decrease Size
Increase Size
Please sign up or log in to join the discussion

Thread Tools Search this Thread
Search this Thread:

Advanced Search



Share Tweet