220v. 230v, 240v, 250v?

[John-SJW]

I saw an oven that was rated at 3,100 watts. Now most would say that cannot be fitted on final ring circuit as rule of thumb. But:
3,100 watts draws amps of:
14.09 amps @ 220v
13.47 amps @ 230v
12.91 amps @ 240v
12.4 amps @ 250v

If the installation is 240v or 250v then it safely inside the 13 amp of a final ring circuit.

The question is, and the regs aficionados can help here, what is the voltage that should be used to assess, as maybe the voltage will vary in an installation over the years.

 

[John-SJW]

3700W requires a 16A supply. The hob probably has internal power management setttings to allow the total load to be limited to 16, 13 or 10A which should be set during commissioning. The rating given on the box is 3700W because that is what the hob is physically capable of delivering.

If you scroll down to the 'installation' tab on this link, Bosch have shown the 3700W limit as corresponding to the 13A plug version. I suspect that is a copy-and-paste mistake from the 16A Schuko-plug version and that they do not intend a 13A plug to supply 3700W.

PUE611BF1B Induction hob | Bosch GB

PUE611BF1B Induction hob | Bosch GB

www.bosch-home.co.uk

It says:

This hob is equipped with a UK 3 pin plug for an easy plug & play installation. The plug limits the maximum power output to 3.7 KW. For higher power output, please select a hob without plug and ensure installation is carried out by a qualified electrician

The 13A UK plug limits the maximum to below 3.7 kW - I think a mistake here in the writing.

 

[DPG]

It says:

This hob is equipped with a UK 3 pin plug for an easy plug & play installation. The plug limits the maximum power output to 3.7 KW. For higher power output, please select a hob without plug and ensure installation is carried out by a qualified electrician

The 13A UK plug limits the maximum to below 3.7 kW - I think a mistake here in the writing.

Agree, it seems like badly worded English.

 

[John-SJW]

Agree, it seems like badly worded English.

That is why I say use your judgement, not always going by the makers instructions.

 

[Lucien Nunes]

The 13A UK plug limits the maximum to below 3.7 kW - I think a mistake here in the writing.

Indeed, as I pointed out in post #59.

NEFF T36FB41X0G
BOSCH PUE611BF1B
SIEMENS EU631BEF1B

All four ring 13A induction hobs.

Bosch, Neff and Siemens are different brands of the same company, so I would expect to find those three hobs to be internally the same core product.

 

[DPG]

That is why I say use your judgement, not always going by the makers instructions.

Yes, but you can see the intention of what they mean.

 

[John-SJW]

My Smeg can be single or three phase.

 

[John-SJW]

Yes, but you can see the intention of what they mean.

That still needs judgement.

 

[John-SJW]

This 3,700 watt hob on a 13A plug, I am certain was a power adjustable version, with the makers not going by diversity. An assumption by me - the UK version with a plug would be factory set to 13A max.

 

[LastManOnline]

It says:

This hob is equipped with a UK 3 pin plug for an easy plug & play installation. The plug limits the maximum power output to 3.7 KW.

Interesting comment from the manufacturer, bearing in mind the 13amp fuse is installed primarily to protect the CABLE supplying the hob.

The 13A UK plug limits the maximum to below 3.7 kW - I think a mistake here in the writing.

13amp plug limit maximum? Unlikely. A 13 amp plug may well carry a few amps above its rating for a significant period

 

[John-SJW]

Interesting comment from the manufacturer, bearing in mind the 13amp fuse is installed primarily to protect the CABLE supplying the hob.


13amp plug limit maximum? Unlikely. A 13 amp plug may well carry a few amps above its rating for a significant period

Yes, fuses blow at above 13A, and only when sustained over-current is being drawn. It is a bad design that relies on the fuse not blowing.

 

[John-SJW]

Had a lady two weeks ago with gas hob and electric oven all controlled with normal cooker point, she wanted to change the hob to electric, no problem, she buys new Bosch induction hob, and I go there with a click dual outlet cooker outlet and some 4.0mm flex to connect it all up.
When we take it out of the box it is rated at 3700 watts and is factory fitted with a lead and 13 amp plug so as we are told to follow manufacturers instructions I then duly fitted a single socket to the cooker outlet circuit and plugged the Hob in.
Did not seem the right thing to do but to date have had no call backs, I do have to go there to do some other work shortly and will check it out and see how it is performing.

Was this to a cooker radial 6mm cable? On on a final ring circuit? If on cooker radial, the plug could have been removed with the hob set to 3.7 kW drawing 16A.

 

[Lucien Nunes]

Interesting comment from the manufacturer,

But I think we have a concensus that this is a mistake.

Agree, it seems like badly worded English.

Achtung!
The Kookerhob is greatpowerneeding and the elektrische Kabels have to be placed bei the Skilledtechnician. In Europe is to make 16A Kuppling with a Schukostecker allowed. In Grossbritannien, because the dumme Plugtoppen the Weakcontacts and Stupidlittlefuses which like Heatelements often the Outburning or Downmelting are the cause of are required to have, is max. 13A permitted. Offchoppen von Plugtoppen is ABSOLUT NICHT GESTATTET!

 

[John-SJW]

But I think we have a concensus that this is a mistake.

By Bosch as well.

 

[littlespark]

But I think we have a concensus that this is a mistake.


Achtung!
The Kookerhob is greatpowerneeding and the elektrische Kabels have to be placed bei the Skilledtechnician. In Europe is to make 16A Kuppling with a Schukostecker allowed. In Grossbritannien, because the dumme Plugtoppen the Weakcontacts and Stupidlittlefuses which like Heatelements often the Outburning or Downmelting are the cause of are required to have, is max. 13A permitted. Offchoppen von Plugtoppen is ABSOLUT NICHT GESTATTET!

Thanks, Buzz... that makes perfect sense...


Oh.. it wasn't Buzz??

 

[telectrix]

But I think we have a concensus that this is a mistake.


Achtung!
The Kookerhob is greatpowerneeding and the elektrische Kabels have to be placed bei the Skilledtechnician. In Europe is to make 16A Kuppling with a Schukostecker allowed. In Grossbritannien, because the dumme Plugtoppen the Weakcontacts and Stupidlittlefuses which like Heatelements often the Outburning or Downmelting are the cause of are required to have, is max. 13A permitted. Offchoppen von Plugtoppen is ABSOLUT NICHT GESTATTET!

in myold house, back in the 70's the fuse box ( wylex with 3036's) was labelled "Achtung. Gerfingerpoken Verboten".

 

[Sparky Pat]

How many rings did that hob have?

4

 

[ipf]

But I think we have a concensus that this is a mistake.


Achtung!
The Kookerhob is greatpowerneeding and the elektrische Kabels have to be placed bei the Skilledtechnician. In Europe is to make 16A Kuppling with a Schukostecker allowed. In Grossbritannien, because the dumme Plugtoppen the Weakcontacts and Stupidlittlefuses which like Heatelements often the Outburning or Downmelting are the cause of are required to have, is max. 13A permitted. Offchoppen von Plugtoppen is ABSOLUT NICHT GESTATTET!

Are you Stanley Unwin in disguise?

 

[Julie.]

in myold house, back in the 70's the fuse box ( wylex with 3036's) was labelled "Achtung. Gerfingerpoken Verboten".

I prefer a label like this:

 

[LastManOnline]

When we take it out of the box it is rated at 3700 watts and is factory fitted with a lead and 13 amp plug so as we are told to follow manufacturers instructions I then duly fitted a single socket to the cooker outlet circuit and plugged the Hob in.

Remember the terms "close excess protection" and "coarse excess protection" (not sure if they are used much any more). But manufacturers would be aware that most fuses are pretty crude devices. A 13 amp fuse will happily carry 15,16 amps for more than enough time than it takes to cook your chicken in an ovan or have fry your chop and boil your spud

 

[LastManOnline]

I would never have connected a hob to 13A plug, irrespective of what the manufacturer sent it with. It is a matter of doing it safely, not covering your rear end - or believing them (some dodgy, and vague, instructions out there from many makers).

"Manufacturers instructions". Well that deserves a thread all of its own. The intent is correct. Who knows an appliance better than its maker.? But like everything, it's open to abuse. The solution in my view is proper scrutiny. Instructions without explanations is always a bad idea. Some manufacturers clearly see it as a blank cheque.