RCBO query

[Jurassicspark]

Wire wound heater elements as used in fan heaters, tumble dryers etc can certainly distort and sections short out.

What kind of distortion are you referring to?

Mechanical bending?
Heat warping?
Or anything else that I’m not aware of?

And is this a short between adjacent turns of the element? A short to the sheath?

And would that that short between turns of a resistive wire be relatively low impact due to small voltage differences between adjacent turns? Or am I missing something?

In the oven the 2 connexions were at the same end of the outer metalic sheath so I imagine a short formed within the enclosed element part way round.
In the shower heater I didn't get around to investigating much but at the time: One of the 3 elements was low resistanceend to end but the IR was ok.

How much was it approx?

I haven't seen it for several years so sadly I think it must have gone for scrap.

EDIT: that reminds me, I thought I posted a pic of an over heated flex

Thanks. Useful information.

 

[Jurassicspark]

So what's your solution to the original question?

Don’t think mr morqthana has the on site guide on him.

 

[pete01]

Don’t think mr morqthana has the on site guide on him.

He doesn't like to answer anything for some reason

 

[morqthana]

So what's your solution to the original question?

That was the original question:

If the 6mm cable's to remain in-situ, do you agree re dropping to 32A RCBO?

OK - in passing there was also this question:

Checking the shower installation manual, it states 40/45A MCB for their 9.5kW model, however if running on a 6mm cable they further state circuit protection should be 32A. So that's why he's suggesting a 32A RCBO?

But that's not really a question which can be answered - speculating on what was going through the electrician's mind. The only "real" question was the one quoted above.

 

[pete01]

That was the original question:

So your answer would be don't use an rcbo that may be overloaded?

Doesn't really help someone that doesn't know what you are talking about and just wants a simple answer does it?

 

[pete01]

@diy_fun_uk....look what you started

 

[Harry Bloomfield]

He doesn't like to answer anything for some reason

He strikes me, as some newly qualified individual, who is desperately over-anxious to demonstrate the wealth of their newly acquired knowledge. As you suggest, someone who responds to question, without directly answering it.

 

[morqthana]

So your answer would be don't use an rcbo that may be overloaded?

Doesn't really help someone that doesn't know what you are talking about and just wants a simple answer does it?

And yet:

 

[morqthana]

He strikes me, as some newly qualified individual, who is desperately over-anxious to demonstrate the wealth of their newly acquired knowledge. As you suggest, someone who responds to question, without directly answering it.

So is that why you decided to rudely dismiss a question I asked you instead of answering it?

 

[diy_fun_uk]

@diy_fun_uk....look what you started

lol, tell me about it

 

[pete01]

And yet:

View attachment 390439

Yes thats called an explanation

 

[Jurassicspark]

lol, tell me about it

As this thread is already ruined by a nutcase, reply back to this message, with anything, just to make your message count hit 7,000. You're one post away to hit that milestone.

 

[morqthana]

lol, tell me about it

Don't beat yourself up - where it really went off the rails was when Harry Bloomfield tried to make out that all this:

• As in a time you'd more likely state in minutes than fractions of an hour? Yes.
  As in only a few minutes? No.
• You said "The thing about a shower, is that they only run for a matter of minutes."
  I asked if you meant a time which would be stated in "minutes" rather than "hours" or fractions of hours, or if you meant just a few minutes.
  If some examples would help, does your "matter of minutes" encompass, say, 20/35/50 minutes, or is it limited to 3/5/10. That sort of thing.
  I didn't think it was that complicated.

was unintelligible gibberish, and a bunch of other people joined in with that. Not because there was any justification for saying it - to a man they have swerved all the requests to show a reasoned analysis of the words and the syntax which supports the claim, but because they just wanted to take a pop at me. Whether for their own childish amusement, or because they think that personal animosity is a good guiding principle when posting here, I couldn't say.

 

[pete01]

Don't beat yourself up - where it really went off the rails was when Harry Bloomfield tried to make out that all this:

• As in a time you'd more likely state in minutes than fractions of an hour? Yes.
  As in only a few minutes? No.
• You said "The thing about a shower, is that they only run for a matter of minutes."
  I asked if you meant a time which would be stated in "minutes" rather than "hours" or fractions of hours, or if you meant just a few minutes.
  If some examples would help, does your "matter of minutes" encompass, say, 20/35/50 minutes, or is it limited to 3/5/10. That sort of thing.
  I didn't think it was that complicated.

was unintelligible gibberish, and a bunch of other people joined in with that. Not because there was any justification for saying it - to a man they have swerved all the requests to show a reasoned analysis of the words and the syntax which supports the claim, but because they just wanted to take a pop at me. Whether for their own childish amusement, or because they think that personal animosity is a good guiding principle when posting here, I couldn't say.

OMG it's you that ruined the thread and you cant even see it...jjeeezzzzz

 

[morqthana]

Yes thats called an explanation

So this is OK, and merits thanks:

I would never advise running anything over 32A on a 32A MCB as you will be running it on its curve - a big no.

And this is not OK and merits criticism:

don't put in an RCBO that would be overloaded.

I think you should take a step back and look at yourself.