Help! Supplying two ovens from a single radial

[andy100]

Hello,

I have a 6mm t&e protected radial circuit running from the CU to the kitchen, this was originally going to feed just a new Neff Oven, rated at 3.68KW total connected load ~ 16Amp. This was fine, but now it turns out that the new Microwave we’re getting is rated at 3.1KW total connected load and the technical specs state it should be protected at 15Amps. The Microwave was originally going to be less powerful and would have been able to connect into a 13Amp FCU off of the mains ring but now I have the problem that I have a single 6mm t&e radial that I need to feed both appliances. I have seen the appendix on the 17th ed and know this is allowed.

I have a 32Amp MCB which will protect the 6mm cable and allow enough current to supply both appliances but I’m concerned about short circuit protection for the appliances themselves as well as protecting the 2.5mm flex tails that will run from the isolator switches to the appliances. Any advice would be much appreciated.

Thanks

Andy

 

[Engineer54]

Just testing his confidence in deciding...

Think it's more like your confidence that needs testing!! lol!!:wink5:

 

[i=p/u]

Yes I doubt myself sometimes is why I use too waste time changing to 4mm...

 

[andy100]

Well, for the microwave, it has a 2.5mm 1m flex tail pre-cabled so can't change this anyway.

If the concern is that the 32A MCB is not going to protect the 2.5mm cable then surely you would have another problem with the Oven wiring itself e.g I can see that the onward internal wiring from the connection plate of the oven is at most 2.5mm. So if my 2.5mm cable isn't protected, the oven wiring certainly isn't either. Therefore on that basis I can't see any advantage to change my connection tails to 4mm.

 

[i=p/u]

Uh I wasted my time and customers money

 

[i=p/u]

So what fault current can a 1.5mm flex take

 

[Guitarist]

So the manufacturers instructions are just being ignored?

 

[Engineer54]

So the manufacturers instructions are just being ignored?

Only if they are obviously referring to European type regulations, .....and remember European plug tops and wall accessories do not include fuses!! Yet another reason why chopping a moulded fused plug top from an appliances lead/cord can't and won't void any manufacturer's warranty, no matter what the service company say's, if it is then connected to the mains supply in accordance/compliance with BS7671!!

The big problem with multi national manufacturers instructions, is that rarely do they fully relate to countries outside of the appliances country of origin. Look carefully and you will usually see some form of small print, stating that appliance must be connected to a mains supply in accordance with your countries recognised codes/regulations!!!