shower consumer unit

[kinger68]

need a little help please. I've just changed out a plug in fuse for a shower cu (63a rcd 50 a mcd). Connected correctly, shower powers up ok but when i push test button the rcd doesn't trip. At first I thought faulty rcd so I got a replacement of the same model. Connected up and the same problem. It is an MK Sentry unit. Can anybody help?

 

[Spark123]

Without knowing what you have done and how you have wired it we cannot say!

Can you post up some photos?
If you are in England or Wales then this work is notifiable to your LABC under part p of the building regs.

 

[kinger68]

Ok. I'll try to get a photograph up.

 

[kinger68]

Untitled

• kinger68
• 10 Jun 2009
• 1

 

[ericmark]

You have line going into bottom of RCD through MCB and neutral going into top.

 

[kinger68]

the neutral line from the bottom of the rcd to the bus was pre wired in the unit as was the live bus connecting the mcb to the rcd.

 

[kkynaston]

Your lives are the wrong way round.
Take the live out of the rcd and put it in the MCB and vice vera.

Also where is the shower cu supplied from?

 

[Spark123]

Yes, they are.

What he is saying is the live (red) supply is meant to go into the top of the RCD, the live (brown) to the shower is meant to go to the top of the MCB.
How you get it to hold in at all when the shower starts is anyones guess, unless it has fried the electronics inside the RCD!

I hope that you are isolating the supply cables before working on it too?

 

[RF Lighting]

Are those incommers double insulated?

 

[JohnD]

is this a leg pull?

 

[kkynaston]

is this a leg pull?

I was just thinking that myself

 

[kinger68]

done all of the above but to no avail. tested across pins 1 and 4 of the rcd for resistance with test button pushed - no reading. rcd's knackered. bought and fitted different manufacturer rcbo, job done.

 

[RF Lighting]

Are those incommers double insulated?

 

[JohnD]

done all of the above but to no avail. tested across pins 1 and 4 of the rcd for resistance with test button pushed - no reading. rcd's knackered. bought and fitted different manufacturer rcbo, job done.

The problem is, that you don't know how to install an RCD

=> you are not competent to do this work => you should not be doing it

 

[Steve]

done all of the above but to no avail. tested across pins 1 and 4 of the rcd for resistance with test button pushed - no reading. rcd's knackered.

You wont get a resistance - it only works when its live.

Did you test it using an RCD tester?