4.4kW on a plug?

[Newboy]

Doing some minor works at a clients house and was surprised to find a build-under double oven (with a rating plate 4400W) connected via flex (don't know CSA) & plug(top) to an unswitched 1 gang socket switched above worktop by 45 amp DP cooker switch.

Diversity or cr*p installation?

 

[flameport]

Diversity or cr*p installation?

Both.

The former has prevented the fuse blowing (assuming it even has a fuse in it).
The latter is why it must be replaced with the proper wiring and connector.

 

[Newboy]

Thanks for confirming my thoughts

 

[ban-all-sheds]

Interesting.

Using the standard diversity calculation you get less than 13A.

So if a circuit with a cable with a CCC of 13A was used, and a 13A OPD used, all would be well.

So why not this?

 

[EFLImpudence]

Apart from that, perhaps all the elements can't be on at the same time.

 

[ban-all-sheds]

Then would it say 4400W on the plate?

 

[EFLImpudence]

Mmmm. I suppose not - if that's all it says.

18A is a strange value for an appliance.

 

[Newboy]

if that's all it says

Heat watts 4300/ motor watts 100 / total watts4400
50 Hz / 230-240v

 

[EFLImpudence]

Can you have all 4400 on at the same time?

 

[Newboy]

Seems to be the case - top and bottom oven seem to work with no interlock to prevent simultaneous use.

The only thing I can think of is that there is a grill element in addition to the top oven element - possibly taking the total load to 4.4kW but not possible with two elements alone.

Can't track down an manual for the product - despite checking all the usual sources and the manufacturer.

Appliance has been in use for over 10 years - plug(top), flex & socket all look undamaged

 

[ban-all-sheds]

Seems to be the case - top and bottom oven seem to work with no interlock to prevent simultaneous use.

As it should be.

If I bought a double oven and found I could only use one at a time I'd be returning it toot sweet.

The only thing I can think of is that there is a grill element in addition to the top oven element - possibly taking the total load to 4.4kW but not possible with two elements alone.

You probably can't use the grill and the top oven at the same time.

The maker might have just added up all 3 elements and got 4.4kW - as EFLI says, it's a strange amount, as it busts the oh-so-common 16A. Don't suppose you noticed if it was made for a market where 3-phase is common?

Appliance has been in use for over 10 years - plug(top), flex & socket all look undamaged

Which prompts me to repeat my question.

Everyone is happy with Ib ≤ In ≤ Iz when Ib is found using the normal diversity calculation, and In & Iz are 16, or 20, or 32 etc.

So why not when it's 12.7 ≤ 13 ≤ {whatever the flex is}?

 

[EFLImpudence]

Is it a moulded plug?

 

[EFLImpudence]

So why not when it's 12.7 ≤ 13 ≤ {whatever the flex is}?

I think it is applicable with a double oven

but

IF all 4.4kW were on or off together and only switching on and off with the thermostat I would not be so comfortable with it being on a plug.

 

[Newboy]

Is it a moulded plug?

No

 

[Newboy]

Don't suppose you noticed if it was made for a market where 3-phase is common?

Only other identifiers on the plate are GB & IE which I would take to be here and Ireland