New lamona cooker hood tripping both rcds

[Paddington]

Hi, installed a new lamona cooker hood as part of a kitchen refit. Connected to 6a lighting circuit on switched 3a fuse supply. All tested fine, but use any function on hood, and dual rcds trip. Checked wiring, all ok, fused switch is new click, but since not tripping when this is switched on, sure it’s not that. Fused switch as it’s own independent cabling. Before I remove extractor And frog march back to howdens, any one any constructive ideas?

 

[Pete999]

Hi, installed a new lamona cooker hood as part of a kitchen refit. Connected to 6a lighting circuit on switched 3a fuse supply. All tested fine, but use any function on hood, and dual rcds trip. Checked wiring, all ok, fused switch is new click, but since not tripping when this is switched on, sure it’s not that. Fused switch as it’s own independent cabling. Before I remove extractor And frog march back to howdens, any one any constructive ideas?

Where exactly have you connected the cooker hood to the lighting circuit?

 

[Paddington]

Run direct from cu

 

[westward10]

Is the hood Class I or II.

 

[DPG]

Out of interest why did you feed it from the lighting circuit if you have taken it direct from the consumer unit? I assumed you had taken a feed from the lighting circuit because you could pick it up near to the location of the hood.

 

[Pete999]

QUOTE="Pete999, post: 1379502, member: 72029"]Where exactly have you connected the cooker hood to the lighting circuit?[/QUOTE]
Have you connected the N to the corresponding N busbar? you may have created a "borrowed N condition"

 

[Paddington]

QUOTE="Pete999, post: 1379502, member: 72029"]Where exactly have you connected the cooker hood to the lighting circuit?

Have you connected the N to the corresponding N busbar? you may have created a "borrowed N condition"[/QUOTE]
Wisps gold to that man, I had indeed borrowed neutral, problem resolved, thank you sir

 

[Pete999]

Have you connected the N to the corresponding N busbar? you may have created a "borrowed N condition"

Wisps gold to that man, I had indeed borrowed neutral, problem resolved, thank you sir[/QUOTE]
Glad we could help out

 

[Taylortwocities]

Of course, you do know that connecting directly to the consumer constitutes a new circuit??

This work therefore needs to be notified to the local authority, and of course you'll be providing an installation certificate that confirms that all of the tests you have done meets the requirements of BS7671?

Of course you will

 

[DPG]

The debate on 'one ocpd = one circuit' will now begin again......

 

[Pete999]

The debate on 'one ocpd = one circuit' will now begin again......

He only has one OCPD he has just connected the N to the wrong busbar.

 

[davesparks]

Which part of the name ‘lighting circuit’ makes people thing it is suitable for providing power to non-lighting loads?

 

[Midwest]

Bathroom extractor fans, are installed onto lighting circuits.

 

[davesparks]

Bathroom extractor fans, are installed onto lighting circuits.

When there is a regulatory requirement for them to be controlled by the lighting circuit it is necessary yes.

 

[Midwest]

Are we talking of Approved doc F?

Not all bathrooms require an extractor fan. I'm just in an argumentative frame of mind. I wouldn't put a cooker hood on a lighting circuit.

 

[DPG]

Deleted .

 

[DPG]

He only has one OCPD he has just connected the N to the wrong busbar.

Sorry , I wasn't clear there. I was meaning Taylor's comment about it being a new circuit.

 

[Taylortwocities]

It's a radial circuit with a 6amp OCPD.
If it offends then just label it on the CU as lighting and extractor fan.

On the 32amp ring final (oh the label just says 'sockets'.)
And there are a couple of FCUs on there, .

What am I to do??? Create another circuit labelled FCUs? Do me a favour.

 

[Midwest]

I reckon about 6 pages

 

[Pete999]

Sorry , I wasn't clear there. I was meaning Taylor's comment about it being a new circuit.

Right Ta

 

[telectrix]

Are we talking of Approved doc F?

Not all bathrooms require an extractor fan. I'm just in an argumentative frame of mind. I wouldn't put a cooker hood on a lighting circuit.

me neither. i'd put it on the wall above the cooker.

 

[Paddington]

Of course, you do know that connecting directly to the consumer constitutes a new circuit??

This work therefore needs to be notified to the local authority, and of course you'll be providing an installation certificate that confirms that all of the tests you have done meets the requirements of BS7671?

Of course you will

Ah, the extractor circuit already existed off the 6a mcb feeding upstairs lights and was switched fuse 13a. I replaced the fused switch so only a minor cert and no part p, but as I was adding a new circuit to electric hob on a 32a 4mm feed, I produced a major, and part p, included a whole plethora of minor changes on the back of the major. Part p completed as part of the condition report that was submitted by other spark. Not sure if neutral was mis connected already or by either of us when Completing tests. Paperwork is ridiculous though, takes nearly as long as finding the borrowed N!

 

[Paddington]

me neither. i'd put it on the wall above the cooker.

I find above the hob is more efficient!

 

[Taylortwocities]

I’m sorry to have confused things. You see, I read

Where exactly have you connected the cooker hood to the lighting circuit?

And then this

Run direct from cu

So I assumed new circuit. Silly me.

 

[DPG]

I see the confusion but, as he says, it's connected to the lighting circuit.

Isn't a circuit defined as electrical equipment connected to the same OCPD??