Installing fitted oven

[Rogercranstoun]

In addition to my Neff U15M62 double oven having an earth stud within the 3 stud terminal box, there's also a large earthing symbol shown on the top casing of the oven with some sort of snap-in lug at its side.

Beyond reference to a qualified person, there's nothing in the installation instructions.

Can anyone clarify its purpose?

Also, I'm planning to connect the oven through a 30A junction box installed in the housing's lower cupboard with H07 3 core 6mm flex, but would it be better to use a 45A connection box?

The cable from the CU to the junction box is 6mm through a 32A mcb. Total connected load of the unit is 5.7kW

Thanks

 

[EFLImpudence]

In addition to my Neff U15M62 double oven having an earth stud within the 3 stud terminal box, there's also a large earthing symbol shown on the top casing of the oven with some sort of snap-in lug at its side.
Beyond reference to a qualified person, there's nothing in the installation instructions.
Can anyone clarify its purpose?

I would think it is just a standard moulding. Perhaps for use with metal housings.
If you have a meter you could check for 0Ω between it and earth terminal.

Also, I'm planning to connect the oven through a 30A junction box installed in the housing's lower cupboard with H07 3 core 6mm flex, but would it be better to use a 45A connection box?

Better to use a proper 45A Cooker Connection Unit.

You do not mention a Cooker Control Switch.
There should be one easily accessible within two metres of the oven.

The cable from the CU to the junction box is 6mm through a 32A mcb. Total connected load of the unit is 5.7kW

That's fine.

 

[Rogercranstoun]

Many thanks for your swift reply EFLImpudence

A separate earth terminal for connecting to a metal housing makes a lot of sense.

I should have mentioned that a 45A cooker connecting switch is positioned on the wall alongside the housing with the 6mm cable then running down inside a dry lined wall to the lower cupboard. I'll be making the connection in there with the H07 running down from the oven.

 

[Rogercranstoun]

Grateful for a little more clarification.

The instructions for wiring the oven make the following observation:

'Contact protection must be ensured by the method of installation'

Am I right in thinking this is reference to the need for my planned 32A MCB and 45A cooker switch

 

[EFLImpudence]

'Contact protection must be ensured by the method of installation'

Is this in the electrical installation section or does it refer to contact with hot parts?

Am I right in thinking this is reference to the need for my planned 32A MCB and 45A cooker switch

I wouldn't think so but could be a reference to correct operation of the protective device(s) if, indeed, it is an electrical instruction.

 

[Rogercranstoun]

This sentence forms part of the 'Connecting the appliance to the power supply' section.

This manly covers safety part 1 requiring an earth + the power cord type (H05 V V-F or higher).

The comment before the 'contact protection' sentence reads:

'In the installation, there must be an all pin isolating switch with at least a 3mm contact gap, or the appliance must be connected to a plug with an earthing contact. This must remain a accessibly after installation'

I've assumed this refers to the 45A DP cooker switch.

As it's a German originating product, my guess is that the original instructions have lost something in translation as the rest of this section talks of the 'phase and neutral (zero) conductor' connecting.

 

[wingcoax]

For "all pin" read "all wire" or "all phase" meaning that the contacts in the switch have a gap of at least 3mm to ensure the circuit is broken on the two main cores(Live/Neutral)

 

[Rogercranstoun]

Thanks wingcoax..that's my understanding; a 45A cooker switch has a 3mm gap on both points when in the 'off' position, preventing any arching of current.

 

[wingcoax]

Good man.