28A in 4mm cable 6.5kw hob

[Jackr123]

i need to wire in an induction hob which is 6.5kw and the cable already chased in is 4mm and would be a real pain to replace for a bigger. I just wanted to know if it would be alright or play it safe with a 6mm?

 

[Dave OCD]

How long is the cable run, does it pass through any type of insulation ?

 

[Jackr123]

Sorry forgot to mention that. The run is 15m, clipped direct and passes through no insulation.

 

[Octopus]

I would normally run 6mm - then there is plenty of scope for future changes .........

 

[polo1]

Well Ref B gives you 28A max on 4mm t&e and the appliance is unlikely to draw all its 6500W at the same time, so 4mm should be fine unless a more onerous installation method has been used.
Ok, clipped direct gives you even more headroom.

 

[Ian1981]

4mm clipped direct is 37 amps so depending on the installation method, 4mm is acceptable as I can't see zs being an issue if only 15 meters long.
Also diversity can be applied so the load is likely to be lower than 28 amps anyway.

 

[Jackr123]

Thank you all very much. Saved me a lot of time and money.

 

[Dave OCD]

Yep in this case 4mm would be fine, but obviously just an isolator for the hob, not a panel with a socket as well. And a 32a MCB for the OCPD, not a fuse.

 

[Octopus]

The hob being 6.5kw - but what would it actually draw?

I've just been working on a kitchen where the customer sourced, induction hob, came fitted with a 13A plug!

 

[Ian1981]

Just over 15 amps applying diversity so even if you had a socket on the control panel that's only 20 amps.

 

[Dave OCD]

No point having a socket as well on a 4mm, pushing your luck IMO. You just know the 3kW 'fast boil' kettle will end up in there.

 

[Ian1981]

The 4mm will handle it as you'll never overload the 32 amp OCPD 15 amps + a 13 amp kettle if that's what it pulls and a CCC of 37 amps.
Don't be so pessimistic dave

 

[Dave OCD]

Now then Ian you're forgetting the oft quoted Christmas Day scenario.

 

[telectrix]

what's wrong with plugging it into the light ( using a bayonet plug, of course). it worked for my mum's iron for 40 years.

 

[Ian1981]

Now then Ian you're forgetting the oft quoted Christmas Day scenario.

That's what a microwave is for!
Microwaved turkey mmmmmm