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Discuss Sizing Cooker fuse / diversity...confused in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

A

aaronstuart

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Replacing cooker 32A mcb.
New is rated at 9kw = 39.1 Amps.

Been reading through other posts and some say I can use existing fuse because of allowing for diversity.
I was led to believe that diversity was for calculating tails / main fuse etc.

Will the 32A mcb be ok or should I uprate it to a 40A?

Having problems getting the mcb, mainly cost......Crabtree sb6000 40A.

Thanks Aaronstuart.:confused:
 
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i would try it on the 32a with it all on and see what happens maybe mesaure what its pulling
if you goto 40a you need to check your cable size
ie length ref method etc
 
A

acat

  • Thread Starter Thread Starter
  • #3
As above but remember that your mcb is to protect the cable so a combination of diversity, current carrying capacity and installation method will decide.


Chris
 
A

aaronstuart

  • Thread Starter Thread Starter
  • #4
6MM cable, approx 8m clipped direct

Thanks for you quick replies
 
A

acat

  • Thread Starter Thread Starter
  • #5
32A should be fine diversity is only a guide unless you are having a big party (am I invited:)) I doubt that you will be having any problems.



Chris
 
S

sparkswillfly

  • Thread Starter Thread Starter
  • #6
32a type b mcb will hold for 1 hour at 40a before it let go
 
D

david.saxon

  • Thread Starter Thread Starter
  • #10
What a wally, I completly missed what he was asking!

Must do better
 
Last edited by a moderator:
E

electro

  • Thread Starter Thread Starter
  • #11
Hi

If its 9KW you need a 40A circuit breaker, diversity is for maximum demand not sizing your circuit protection.

Regards
 
W

Wotsit

  • Thread Starter Thread Starter
  • #12
Dont really beleive what i am reading! Since when was putting in a smaller protective device to get over cable size acceptable?

Every circuit shall be designed so that a small overload of long duration is unlikley to occur

Co-ordination will only be met when regulation 433.1.1 is met. i.e Ib<In<Iz

1. The rated current of the protective device (In) is not less than the design current (Ib)
2. The rated current will not exceed the lowest ccc (Iz) of the circuit

What you are suggesting by "bang in a smaller breaker it will be all right mate" can lead to a potentialy overloaded circuit:confused:

And the post about diversity is utter rubbish
 
Last edited by a moderator:

scotsparky

-
Arms
What you are suggesting by "bang in a smaller breaker it will be all right mate" can lead to a potentialy overloaded circuit:confused:

And the post about diversity is utter rubbish



That part.!
 
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