View the thread, titled "Tripping electric shower" which is posted in Australia on Electricians Forums.

S

stoutlad

Hello, I've read a few similar threads online but none come up with an answer.

I've had this particular 9.5Kw shower for 3-4 years and has run without problem. A few days ago it it just cut out after about 4 or 5 minutes and set off the trip switch which is a Proteus B45. Firstly after reading some stuff I tightened all the connections in the shower unit and in the isolator switch outside the bathroom, it is the type like a cooker switch but with 'Shower' written on it. Same thing happened again but seemed to be after only a minute or so this time. Since the shower is used a lot I decided that it just must be on it's last legs so bought a new one only to discover the same thing happening again. I replaced the isolator switch outside the bathroom and still no better. The only thing I have not tried is replacing the actual B45 trip fuse thing but I figured if that was the problem it simply wouldn't work, would it?

Some details.. 9.5Kw Triton replaced with 9.5Kw Triton with a different model name but exactly the same fittings, I didn't have to alter anything at all to fit it in, think it must be same model but new name. Nothing else is connected to the shower circuit, the cable runs from it's own box next to the main fuse box directly to the isolator switch outside the bathroom then from there, through the wall to the shower. It is 10mm cable.

Any ideas as to the cause?
 
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I am going for a low reading in meg ohms if you IR this, something like where the regs state below 2megohms then investigate.....this could be the case
 
Well he hasn't phoned back, thought he might have phoned last night or this morning just to let me know he got my message and maybe say when he could have a look so I have went and got a new MCB @ £16 odds and tried it and it appears to be working. Had it running for 7 minutes without it tripping. Hopefully that's what the problem was but I'd still like it checked out to make sure there's nothing else wrong
 
Just goes to prove, the simple things are generally the best things to check/change first. Seems the OP has replaced/changed just about everything on this installation except the cable, ..Shame the MCB was the last thing rather than the first...lol!!! Expensive learning curve that one, but one he won't forget in a hurry!! lol!!
 
Just goes to prove, the simple things are generally the best things to check/change first. Seems the OP has replaced/changed just about everything on this installation except the cable, ..Shame the MCB was the last thing rather than the first...lol!!! Expensive learning curve that one, but one he won't forget in a hurry!! lol!!
Yes :icon9: . Hopefully the old shower was what caused the problem with the MCB, can the old one (shower) be tested without being connected up? About 4 years is all we ever get out of those type of showers usually, ofen not even that. In years gone by we never had a MCB, it was just a fuse but the shower used to blow too after about 3 years
 
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Still not been to check this out by the way, what was that about electricians coming when they say and plumbers not? :)
Where are you based? Someone on here will be out to you within the hour. You've either got a short on the cable run or a faulty mcb. Won't take long to find
 
don't think scottish circuits leak to earth, there too tight :)

watch out, mogga's about.LOL.
 

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