Just thought of something else to ask, as you do. The 40 amp MCB comes with a 6kA, 10kA and 15kA rating and I read somewhere recently that the 6kA trips fewer times than the 10kA. Which would be best for a shower?
Type 'B' MCB's
- Thread starter philhoward
- Start date
This rating on MCBs refers to the current it can withstand and continue to operate.
It is very unlikely any fault in your house will approach 6kA therefore this will suffice.
How many times do you expect your MCB to trip?
It is very unlikely any fault in your house will approach 6kA therefore this will suffice.
How many times do you expect your MCB to trip?
I don't expect it to trip at all but in my search for the perfect MCB for my Memera 2000 C/U I just wanted to make sure i was buying the correct item. Thanks again
6/10kA that you see on your breakers is in reference to the Ics, this is the rated short circuit capacity of the breaker.
It will display the maximum current that the device can interrupt safely.
It will display the maximum current that the device can interrupt safely.
But you already asked that question on Sunday on your other thread http://www.diynot.com/forums/viewtopic.php?p=2038811#2038811
Didn't you like the replies you got?
The "perfect MCB" for your Consumer Unit will be the one that the competent person provides when he does the work. Your question leads me to suspect that you do not have that competence level.
Get an electrician. The combination of water and electricity isn't worth the risk.
Strange that nobody has asked this yet:
Can you confirm that the circuit cable is rated for 40A given how it's installed?
And what testing do you plan to do, and how?
Can you confirm that the circuit cable is rated for 40A given how it's installed?
And what testing do you plan to do, and how?
Didn't get e reply to that part of my question. Household consumer unit new to me but I was a RM Mechanic with Autoelectrician who had to work outside with 240v Generators in snow ,hail and rain so I do know the hazards which is why I asked pertinent questions...
6mm double insulated twin core and earth (I presume that sparky new his household stuff) and installed when the house was built in 1996. Needs a 45 amp, double pole switch to be fitted before the shower unit and if it is in the bathroom it needs to be corded. Plumbing needs an inline shutoff valve for the water as well which will be done.
Not exactly - It is the maximum current which it can interrupt without damage to itself and hence continue to operate.
Do you know what the maximum current carrying capacity of the 6mm cable is?
There is a way of working it out if you're interested?
What provision is there for additional protection?
Martin
Think I made a little error there, trying to watch the cycling and post is not my forte.
It's the Icn that can be interrupted safely.
Maybe, maybe not.
Maybe he didn't expect it to need to carry 40A - I guess it used to be on a 32A?
But as you are taking responsibility for a new design, you have to ensure that the cable as installed has an adequate current carrying capacity.
Yes, but what testing do you plan to do, and how?
- http://www.diynot.com/wiki/electrics:mcbtocable
- http://www.tlc-direct.co.uk/Book/4.3.1.htm
- http://web.archive.org/web/20080213151445/http://www.kevinboone.com/cableselection_web.pdf
- http://www.tlc-direct.co.uk/Book/4.3.11.htm
- http://www.tlc-direct.co.uk/Technical/Charts/VoltageDrop.html
- http://www.tlc-direct.co.uk/Book/5.3.1.htm
- http://www.diynot.com/wiki/electrics:mcb2
- http://www.tlc-direct.co.uk/Book/8.1.1.htm
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