Amp rating of this oven

[EFLImpudence]

An appliance using resistive heating elements can have a failure mode that causes the current flowing on the Live wire to be higher than the designed current.

Do you think an oven that is part of a cooker has larger wiring than a single oven; if not, how do you justify using a higher rated OPD for a cooker?

 

[JohnW2]

Back to my question. What size MCB should I use in this situation? Sorry, I’m still unclear on this.

That really depends upon whether you want an answer in terms of electrical considerations/ calculation and 'electrical common sense' OR whether you want to 'fully comply' with the manufacturer's 'instructions'.

If the latter then, as I understand it, the manufacturer seems to be clear enough in stating what they 'require' - and, if you want to follow their 'instructions' literally, it presumably cannot be any sort of MCB, because they require a 25A fuse. ... many of us would probably suggest that such an approach would be silly!

Kind Regards, John

 

[Jupiter01]

For the umpteenth time the one you have is OK. No need to spend money, time, or effort

I don’t have one!!
Asking for a recommendation on what size breaker I need

 

[bernardgreen]

that the probability of such an event is so low as to not require (or really justify) addressing it in any way.

Sometimes the "addressing" comes after the "impossible" event has happened from lawyers acting for the person(s) who suffered loss and/or injury in the event,

 

[EFLImpudence]

Do you, John, not discover once that the so-called manufacturer's "instructions" for MK sockets were actually written by the marketing department; not electrical experts?

 

[Jupiter01]

That really depends upon whether you want an answer in terms of electrical considerations/ calculation and 'electrical common sense'

This one please John

 

[bernardgreen]

Do you think an oven that is part of a cooker has larger wiring than a single oven;

I believe that the manufacturers will use wire ( just ) adequate for the current carrying needs of the element the wire is connected to.

I also considerate it possible that some ovens nay be designed to contain any minor fire that night be caused by overheated wiring in the oven

 

[JohnW2]

Sometimes the "addressing" comes after the "impossible" event has happened from lawyers acting for the person(s) who suffered loss and/or injury in the event,

You appear to be perpetuating the view that it is not acceptable to leave any theoretical risk "unaddressed", even if the probability of the event occurring is incredibly small.

Lawyers may, of course, 'try it on', but I really don't think that any Court would buy into such a view.

Kind Regards, John

 

[JohnW2]

Do you, John, not discover once that the so-called manufacturer's "instructions" for MK sockets were actually written by the marketing department; not electrical experts?

That is, indeed, what I was told by their Technical Department - which they gave as their reason for 'not being sure' what was meant by "13A per socket outlet" ... and that didn't relate merely to "Manufacturer's Instructions" - it was with reference to something described as a "Technical Data Sheet" (albeit apparently written by the marketing dept.!)

Kind Regards, John

 

[JohnW2]

This one please John

4800 W would translate to 20A (max) at 240V, and if (as is virtually always the case), that would translate to about 19.17 A at 230V (which one is meant to be able to use for calculations. On that basis, a 20 A OPD would be adequate.

However, one is allowed to apply diversity - and the after-diversity current is about 13A - so a 16 A OPD would actually be acceptable.

Having said all that, you have (greatly oversized) 10 mm² cable, so it's totally unnecessary (from the point of view of cable protection) to consider OPDs anything like as small as 16/20 A (as has been said, you could probably have a 63A one!).

I would think that most people would, as for any 'cooker circuit', probably use a 32 A MCB. That would give more than enough protection to the 10 mm² cable - and the only reason for going any lower than 32A is if you wanted to 'obey' the MIs - but, as has been said, if they really felt that their appliance (rather than the cable) required "25A protection", it should be provided internally in the oven.

Does that help?

Kind Regards, John

 

[DetlefSchmitz]

Here's the actual instructions. Usual meaningless cop-out if you ask me.

 

[EFLImpudence]

Oh dear.

 

[JohnW2]

"Accidental contact" with what?

Kind Regards, John

 

[JohnW2]

Would any native-English-speaking person who knew anything about electrical installations use the phrase "energy-isolating device"?

In what way, I wonder, would not having an "energy-isolating device" and/or not "identifying the live and neutral conductors in the mains socket" result in "damage to the appliance"?

Kind Regards, John

 

[winston1]

I don’t have one!!
Asking for a recommendation on what size breaker I need

So you are putting in a new circuit. Have you notified building control? You cannot add a circuit to a CU without doing that.