Wiring up an induction hob - wanted to sense check if what I'm doing is correct

[davesparks]

on single phase you don't require the black and grey. blue to 4, brown to 3. link 2-3.

No, he needs the grey and black as per the diagram, the brown and blu encores aren't of sufficient CSA for the current, that's why the diagram is shown with the grey/ blue and brown/black paired at the connection plate, not just linked out on the hob terminals.

 

[davesparks]

so they've supplied a cable meant for 2 phase to a customer with a single phase supply?????

Yes, this is fairly common, although the flex is normally pre fitted to the hob rather than being loose.

 

[telectrix]

so to pre-empt Brexit..... ditch the foreign 5 core and fit some goof old British 7/036 3 core in red/black.

edit. good,not goof.

 

[PEG]

No, he needs the grey and black as per the diagram, the brown and blu encores aren't of sufficient CSA for the current, that's why the diagram is shown with the grey/ blue and brown/black paired at the connection plate, not just linked out on the hob terminals.

Yep,neutral is actually linked at both ends,in diagram.

 

[Cupa]

Morning folks!

The hob is a Bosch PIE631FB1E, 7.4kW. I couldn't find a useful manual aside from how to use the thing.


So, I rang Bosch tech support who said the 5 core is the
correct cable to use in the UK and that I should hook the lot up as per schematic N1, as shown on the back of the hob.
Things I'd like to know the answer to if anyone knows:

(a) #1 remains unused for some reason

(b) #4 + #5 are linked if you look carefully whereas #2 + #3 are not?!



(c) appliance has a sticker rating of 7.4kW, the cable is much thinner than the 4mm 3 core heatproof flex I hooked the oven and grill up with. Is this due to the diversity factor?

Thank you for the ongoing help guys, appreciate it.

 

[Bobster]

a) probably a generic molding used for multiple appliances, or even a three phase version.

b) 2 and 3 could be wired as separate phases, this is why they are kept separate from the factory. The neutral is always linked.

c)You are using 2 x what looks like 2.5mm for both the "live" and neutral so in effect 5mm.

Put some brown heat shrink or tape over the black on both ends, and put some blue heat shrink or tape over the grey wire to identify that they are being used for the same thing.

 

[Cupa]

Thanks Rob! I bought a new heat gun about six months ago and have been itching to use it, so will crack open the shrink wrap assortment and get that done.

 

[Cupa]

Hello guys just wanted to give a quick update - here is how I wired the induction hob in (pic attached).

At the cooker outlet plate end, I applied my shrink wrap in pairing up the blue + grey (neutral) and then separately paired up the black + brown (live).

Sadly I don't have a photo of that part because it was only after I finished everything AND put the cover on the cooker outlet plate back on and fitted the kitchen drawers that I realised I didn't do a photo, doh!

Went back to the consumer unit, fired it up and it works a treat.

Thanks to all for your help!

 

[Always learnin]

What an excellent post and series of answers.
I'm replacing an old ceramic job with an almost identical Bosch induction hob to that of the original poster. So finding this post has resolved my query about the cabling BUT the 5 core cable supplied by Bosch with our 7.4kw induction hob is actually marked 1.5mm.

My Question 1..... An assumption was made in one of the answers above that it's "probably 2.5mm" so I'm naturally concerned that my 2*1.5mm (3mm) cables will be right on the limit for my 7.4kw Bosch induction hob.
My Question 2.......The length of exposed cables from the outer sheath to the crimped ends is 7cm. This seems to me a bit long to be of much use? The crimped ends will be great to connect into the cooker outlet screws, but will mean that the sheathed section is outside the cable gripper.
Any suggestions or advice will be gratefully received.