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Topic Title: B&Q's sink requires earthing....
Topic Summary: or does it?????
Created On: 07 October 2011 09:25 AM
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 07 October 2011 09:25 AM
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tomgunn

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Hi all....

I was fitting a section of a kitchen last week and the supplied B&Q stainless steel sink instructions said that the sink must be connected to an earth for 'static earthing' reasons... any feedback on this as I thought that the 17th ed doesn't incorporate anything for a kitchen sink anymore?


Oh dear... oh dear oh dear... I do hesitate when I post these types of questions!!!!

Oh well... its done now!!

Tom...

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 07 October 2011 09:33 AM
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normcall

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Static is a real problem, Tom.
I always need to investigate the cause and usually caused by man-made fibres in underwear. Strangely, it's usually female underwear as they spend more time at the sink.

That's my excuse anyway, what's yours?

-------------------------
Norman
 07 October 2011 09:36 AM
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daveparry1

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It's true the regs. dont require it in domestics but I suppose we're back to "manufacturers recommendations" so I suppose it should be done if that's what they say Tom,

Dave.
 07 October 2011 10:28 AM
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spinlondon

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Very odd, I''ve just fitted a sink for my Daughter a couple of weeks ago.
Went with her to B&Q when she purchased it to get some bits for the new worksurface.
Nothing in the instructions about earthing, and no tag to connect to.
 07 October 2011 12:01 PM
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tomgunn

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Hahaha... well Norm... I will be wary of washing my knickers too much... and always earth myself when they are done!!

But Dave... why doesn't the 17th ed allow for that though? We all know that a potential can be introduced.... duh wot to do?

Good point spin..... there wasn't an earth lug on the sink that I fitted either!

Ummmm... do I or dont I fit an earth?

Cheers!

Tom..

BTW... Can I be the first to say merry Christmas to all?

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Tom .... ( The TERMINATOR ).

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I can resist anything..... except temptation! ( Karl Gunn ).
 07 October 2011 12:12 PM
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ant1uk

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I still fit an earth on as it only costs a few pennies.

The 17th doesn't require it but imagine your client shows his new kitchen to his mate next door and has a look round and says your electrician didn't earth the sink, then your client thinks you have cut corners even though you done it to the regs. Is it worth the argument and end up going back to do it anyway wasting more time and money.

This does happen trust me!
 07 October 2011 12:13 PM
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AJJewsbury

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What do the manufacturer's instructions say exactly? Any if's or but's around them? Earthing to dissipate static is usually done through a high resistance (several M ohms) and doesn't feel appropriate for a domestic kitchen.

I can see it would be useful if someone's using the draining board to play with old CMOS ICs, but hardly the sort of thing I'd expect sink manufacturers to take into account.
- Andy.
 07 October 2011 12:22 PM
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OMS

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Good point spin..... there wasn't an earth lug on the sink that I fitted either!

Ummmm... do I or dont I fit an earth?


To what Tom - 1/4" hole in the drainer with a 6mm brass bolt ? -

Regards

OMS

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 07 October 2011 12:30 PM
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daveparry1

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It could just be that they're still using instructions that were first issued years ago, I often see instructions with recently bought fittings which still refer to zones 1,2,&3!
 07 October 2011 01:16 PM
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tomgunn

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Originally posted by: OMS

Good point spin..... there wasn't an earth lug on the sink that I fitted either!



Ummmm... do I or dont I fit an earth?




To what Tom - 1/4" hole in the drainer with a 6mm brass bolt ? -



Regards



OMS




-------------------------
Tom .... ( The TERMINATOR ).

handyTRADESMAN ... haha

Castle Builders

Why did Nick Clegg cross the road? Because he said he wouldn't!

I can resist anything..... except temptation! ( Karl Gunn ).
 07 October 2011 01:21 PM
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marclambert

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Would that be earthing or bonding you're referring to?
I can recommend a good book on the subject, published by David Somebody or another I think...
 07 October 2011 01:22 PM
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tomgunn

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Yeah but no but.... lok me 'onour... core blyme or wot? I waz only dooooing wot the 17th ed sed... 'onest me-lud!!

The thing is..... I have not liked the idea of not earthing the kitchen sink... even though the regs say not to.... in future I'll suppliment all sinks, ( obviously with a 6mm brass bolt!!!! ). I have had a look in my dustbin but the slip of paper's not there... it must be in the clients bin. I am going back soon so I'll grab it and post it.

Good replies... cheers!

Tom

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Tom .... ( The TERMINATOR ).

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I can resist anything..... except temptation! ( Karl Gunn ).
 07 October 2011 01:23 PM
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tomgunn

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Originally posted by: ant1uk

I still fit an earth on as it only costs a few pennies.



The 17th doesn't require it but imagine your client shows his new kitchen to his mate next door and has a look round and says your electrician didn't earth the sink, then your client thinks you have cut corners even though you done it to the regs. Is it worth the argument and end up going back to do it anyway wasting more time and money.



This does happen trust me!


Ahhhhh. I wasn't trying to save time or money just going with the 17th ed..... I know what to do the next time... haha!!

Tom

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Tom .... ( The TERMINATOR ).

handyTRADESMAN ... haha

Castle Builders

Why did Nick Clegg cross the road? Because he said he wouldn't!

I can resist anything..... except temptation! ( Karl Gunn ).
 07 October 2011 01:27 PM
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OMS

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Stop worrying Tom - if the sinks in and they have water just march on - plenty more jobs to do mate

regards

OMS

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 07 October 2011 02:14 PM
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spinlondon

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They used to attach plug chains to the rear of cars to disipate static.
I've also heard a phrase about being chained to the kitchen sink.
I wonder....
 07 October 2011 02:46 PM
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tomgunn

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Originally posted by: OMS

Stop worrying Tom - if the sinks in and they have water just march on - plenty more jobs to do mate



regards



OMS




-------------------------
Tom .... ( The TERMINATOR ).

handyTRADESMAN ... haha

Castle Builders

Why did Nick Clegg cross the road? Because he said he wouldn't!

I can resist anything..... except temptation! ( Karl Gunn ).
 07 October 2011 03:40 PM
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geoffsd

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The sink should not be 'earthed'.

It will require 'bonding' if it is an extraneous conductive part.
 07 October 2011 03:57 PM
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tomgunn

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Good point! BUT... I don't think that the sink is an extraneous conductive item as its connected by copper and lead pipework.... or.... am I wrong?

Tom

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Tom .... ( The TERMINATOR ).

handyTRADESMAN ... haha

Castle Builders

Why did Nick Clegg cross the road? Because he said he wouldn't!

I can resist anything..... except temptation! ( Karl Gunn ).
 07 October 2011 04:10 PM
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marclambert

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Ere we go again..If it's connected to copper water incoming (which is already bonded) then yes it's extraneous, but already bonded. If it's isolated from the copper by plastic washers etc, then no it's not extraneous any more than a fork on a work top is. So no don't bond. Simples
 07 October 2011 04:16 PM
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AJJewsbury

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I don't think that the sink is an extraneous conductive item as its connected by copper and lead pipework.... or.... am I wrong

Pipework or not, the sink is highly unlikely to be an extraneous-conductive-part. To be an extraneous-conductive-part it need to be able to introduce a potential into the installation (or location). Given that (usually) no part of the sink is outside the installation, it can't really carry a voltage into the installation.

The pipework could be an extraneous-conductive-part (if its metallic and comes out of the ground for instance), but then you'd sort that by bonding the pipework where it enters (i.e. normal main bonding).

I'm sure there's no BS 7671 requirement to bond a sink.

Manufacturer's instructions might be based on something else. I've no idea what (trying to avoid corrosion when connected to pipework of dissimilar metals perhaps? - I'm making this up!). My feeling is that something's been lost in translation somewhere... If you need an answer, the first step must be to see what the instructions actually say. If they don't make sense, then challenge the manufacturers....

- Andy.
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