I'm glad that you found the FCU and have, at least temporarily, solved your problem!... so I removed this appliance and to my surprise I found a fused spur switch with 13amp fusewhich had blown, which now explains why the 40amp mcb didn’t trip, ...
As EFLI has implied, if a load which drew 40A was connected via a 13A fuse, it would never have worked (fuse would have blown first time it was switched on) - was that the case?The reason it blew is because it shouldn’t be connected to a 13 amp fused spur, the cooker is rated at 40 amps so I have now replaced it with a proper cooker switch as it’s protected by the mcb.
Was that the first time you had ever used the cooker?
Are you sure the cooker supply is actually routed throught the 13A fuse?
As EFLI has implied, if a load which drew 40A was connected via a 13A fuse, it would never have worked (fuse would have blown first time it was switched on) - was that the case?
The instructions for the cooker may say (almost certainly unnecessarily) that it should be connected to a "40 A supply", but it is very unlikely that it would actually require a supply anything like that large.
Do I take it that the 'cooker' really is a 'full cooker' (i.e. an oven plus hob)? Ovens alone are often designed to run of a 13A supply (e.g. through a plug/socket) and, even those which need a bit more than that probably don't usually draw enough current to blow a 13A fuse.
Yes it’s a 5kw oven and the secondary unit is a oven/microwave, both connected to this supply, looking back when the fuse blew I did have both ovens operating at same time, maybe this caused some overload. All good now.
Fair enough. By application of the accepted principle of diversity, A 5kW oven, in itself, would be deemed to take ('an average of') about 13.5A, which would never blow a 13A fuse. However, if this was perhaps the first/only time you had also run the two appliances simultaneously (through the same 13A fuse) that might well be the reason why the fuse blew on this occasion.Yes it’s a 5kw oven and the secondary unit is a oven/microwave, both connected to this supply, looking back when the fuse blew I did have both ovens operating at same time, maybe this caused some overload. All good now.
Are you sure it wasn't a kitchen fitter?I’m ****ed off with those electricians who did this in first place.
Is that not what the "5kW" the OP told us will be?What is the maximum load of the oven?
You may be right they were general builders doing everything under supervision of the contractor.Are you sure it wasn't a kitchen fitter?
LMFAOdoing everything under supervision of the contractor.
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