Just had an Electrolux 7.4Kw hob fitted. Instruction say an H05BB-F Tmax 90c cable MUST be used between the hob & junction box. Nobody seems to know what this cable is, or where to get it. Electrolux are out of stock. Electrician used standard 6mm. Hob has 4 x 2.3Kw rings, with boost to 3.2Kw but is rated at 7.4Kw. Has power sharing circuitry but can only handle 1 ring on full at a time, remaining rings in use drop down from full, thus losing maximum heating ability. Most annoying. Electrolux service tech won't investigate as 'correct' lead has not been used, but admits that the unit seems underpowered. He boiled .5L water from cold, took 6m 20. He reckons it should take 3m 40. Hob sits on shared 30A feed with oven, but running the oven doesn't alter boil time dramatically. Any suggestions please.
Are you a tradesperson and able to answer this question?
If an undersize circuit breaker had been fitted, it would just trip out! It's nonsense to think that the hob has any form of intelligence than can determine what type of circuit protective device is fitted upstream, so LV electrical is wrong there.
The hob probably came with a wiring diagram that showed several connection options as its made for the whole of the EU and not just the UK. In some EU countries the hob would be connected at 230v as in the UK and elsewhere at 400v. First thing is to check connections and that any removable links that need to bridge the live terminals are fitted are in place etc.
H05BB-F cable is a black high temperature flexible rubber cable (normally referred to as HO7RNF) and is widely available. Most UK electricians don't use it as it's expensive and they don't normally have it with them on their van. Here's a link to an ebay seller that sells it per metre:
http://www.ebay.co.uk/itm/6mm-x-3-Core-Rubber-Cable-H07-H07RNF-HO7-HO7RNF-CUT-TO-LENGTH-/251416265294?pt=UK_BOI_Materials_Supplies_Electrical_ET&hash=item3a8993c24e#ht_618wt_1018
Electrically fitting this high temp flexible cable will make no difference to how the hob functions and the fault could well be a control circuitry issue inside the hob if it's been correctly wired and links are in place as mentioned above.
Anyone for ohm's law? Anyone....? No? Maybe test the voltage just a thought, funny no one has mentioned this, it's only the first rule of electrotechnical practice, that and you don't talk about electrotechnical practice... Caio.
the cable is just heat resistant cable.
Power sharing induction is normally just seen on a 13 amp supply, where the power management is controlled so that it doesn't draw more power than the 13 amp fuse can cope with.
I haven't seen power share on a hob designed for a 32 amp dedicated cooker circuit, it doesn't make sense to me.
Are you sure this is not a 13 amp variant ?
The 13 amp version is designed to be a replacement for those swapping to electric from a gas hob, which is plugged into a normal socket
