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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 04:18 PM
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spinlondon

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I thought the instructions were to earth the sink, to disipate static.
 07 October 2011 04:21 PM
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tomgunn

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Thanks... more good points.... ( had to laugh at "trying to avoid corrosion when connected to pipework of dissimilar metals perhaps? - I'm making this up!" ), the packaging just said that the sink needs to be connected to earth for 'static' reasons... it was that simple... but I will get the slip back and post it!

Cheers peeps!!

Tom

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 07 October 2011 04:23 PM
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AJJewsbury

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I thought the instructions were to earth the sink, to disipate static.

That's what was said, but it seems a but unlikely that something metallic that large with lots of water splashing around the vicinity is going to build up much of a charge. People charged up by some other means (Norm's knickers or whatever) might discharge to the sink - but I would have thought that solidly earthing it would be likely to make that problem worse not better.
- Andy.
 07 October 2011 04:34 PM
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geoffsd

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These are very dangerous instructions by B&Q.
Whether there is some mysterious reason for them regarding the sink itself is of no consequence.

Should the sink, for example as has already been said, be connected to only plastic fittings then it MUST NOT be bonded.
 07 October 2011 04:34 PM
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John Peckham

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I think you will find that BS7671 has not contained the words "sink" or "kitchen" since 1991!

-------------------------
John Peckham

http://www.astutetechnicalservices.co.uk/
 07 October 2011 05:14 PM
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skup53

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Was the sink specifically designed to have an electric waste disposal ?
That may be a clue !!
 07 October 2011 05:16 PM
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tomgunn

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Originally posted by: geoffsd

These are very dangerous instructions by B&Q.

Whether there is some mysterious reason for them regarding the sink itself is of no consequence.



Should the sink, for example as has already been said, be connected to only plastic fittings then it MUST NOT be bonded.


I rarely use plastic pipework as it is not good at keeping the taps in a solid state, ( using plastic pipework tends to let the taps move about a bit after a while once fitted ), so all pipework is in copper / lead. The bad point on my side is that I didn't check the clients bonding! I am going back and I will check for this!

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 05:17 PM
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tomgunn

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Originally posted by: skup53

Was the sink specifically designed to have an electric waste disposal ?

That may be a clue !!


No.... its a basic sink and if it did have one then I would not be able to fit it as I am not a part P member... but my son is. The thing is if there was a unit to be fitted then that would be earthed anyway.

Cheers!

Tom

-------------------------
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 05:25 PM
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mawry

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Crikey I hope a certain author doesn't see this post otherwise we'll have another 500+ thread on here!
 07 October 2011 05:33 PM
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tomgunn

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sorry!

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 05:39 PM
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rocknroll

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Originally posted by: tomgunn

sorry!

Tom


Is this any use to you;

http://forum.davidicke.com/showthread.php?t=159975

I thought you had him on speed-dial LOL

regards

-------------------------
"Take nothing but a picture,
leave nothing but footprints!"
-------------------------
"Oh! The drama of it all."
-------------------------
"You can throw all the philosophy you like at the problem, but at the end of the day it's just basic electrical theory!"
-------------------------
 08 October 2011 10:46 AM
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tomgunn

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Originally posted by: rocknroll

Originally posted by: tomgunn



sorry!



Tom




Is this any use to you;



http://forum.davidicke.com/sho...ad.php?t=159975



I thought you had him on speed-dial LOL



regards


Oh RnR... I do love you, ( not in a 'manly' way of course ), where would this forum be without people like you? I went to see him at Brixton... couldn't get out of it.... had a screaming match at the bloke sitting next to me.... in there for nigh on 12 hours... me bum was sore... my head was throbbing.... no hes not No 1 on my Christmas list.... but he does have some good points and NO.... I will not get in to a slanging match on this forum again... I'm a granddad!! I'm reeeeeeeeeeeeeeelaxed, calm, also sometimes but oveall happy!

Have a nice weekend all... orf to the carboot ... again... hahaha ( ).

Tom

-------------------------
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 ).
 08 October 2011 10:55 AM
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OldSparky

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back on topic..

i had a customer who kept getting static shocks of her sink..

it was caused by walking over her new laminate floor, then when she touched the sink she discharged.. would it be better not bonded??
 08 October 2011 11:26 AM
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impvan

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when she touched the sink she discharged.. would it be better not bonded


Why? She'll discharge just the same..

If the sink's NOT bonded, she'll get a shock as she charges up the uncharged sink.
If the sink IS bonded she'll get a shock as she discharges.

Arguably, she'll get a lesser tickle from the NOT-bonded sink, 'cos she won't be losing ALL of her charge; the charge will try to equalise between her and the sink.



If only B&Q paid as much attention to removing the razor-like edges from their sinks as they do in producing *****-covering pseudo-electrical advice....
 08 October 2011 05:07 PM
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Maxpower

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So here we are again at the same old crossroads.

We have a "Bible" to guide us which we must abide to, which I believe contains the sentence "there is no requirement in BS 7671 to bond kitchen sinks" or similar, but we have manufacturer's instructions which have to add their own layer of instructions mostly to cover themselves rather than to provide an element of protection or safety.

So do we adhere to 7671, or 7671 first then the manufacturer's instructions?

It's not just about what will keep us out of court, but what is sensible, and also what will get the bill paid - yes I've had a works manager threaten to withohold my cheque unless I did bond the sink.
 08 October 2011 05:16 PM
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OMS

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If there is no provision on the sink for a termination (as Tom said) how can the manufacturers instruction stack up, they are effectively nonsense along the lines of "please earth this sink to avoid static, but we don't believe that's credible so we have shaved about 4p off the manufacturing cost by not providing a tag but couldn't be ***** to re write the leaflet -

BS 7671 doesn't require it, common sense doesn't require it - so leave the bloody thing unbonded and just crack on

regards

OMS

-------------------------
Failure is always an option
 08 October 2011 05:30 PM
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rocknroll

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Originally posted by: OMS

If there is no provision on the sink for a termination (as Tom said) how can the manufacturers instruction stack up, they are effectively nonsense along the lines of "please earth this sink to avoid static, but we don't believe that's credible so we have shaved about 4p off the manufacturing cost by not providing a tag but couldn't be ***** to re write the leaflet -

BS 7671 doesn't require it, common sense doesn't require it - so leave the bloody thing unbonded and just crack on

regards

OMS


The progress of this thread has led me to believe there is some evidence of a definite 'sinking feeling' in your post!! :

regards

-------------------------
"Take nothing but a picture,
leave nothing but footprints!"
-------------------------
"Oh! The drama of it all."
-------------------------
"You can throw all the philosophy you like at the problem, but at the end of the day it's just basic electrical theory!"
-------------------------
 08 October 2011 05:45 PM
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Avatar for OMS.
OMS

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The progress of this thread has led me to believe there is some evidence of a definite 'sinking feeling' in your post!! :


Very good Funkmeister - , like what you did there

Grumpy for sure - still at the desk, trying to unravel an impossible nat vent scenario (I wish someone would tell Architects that blue and red arrows on a drawing won't actually make the air go where they want it to) when I should be Looking for the Heart of Saturday Night -

Regards

OMS

-------------------------
Failure is always an option
 08 October 2011 05:51 PM
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bob1963

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If it is just static buy an anti static spray from RS, we had this problem with bank vaults giving peeps shocks, problem solved.

PS dont wear womens underwear at work if it gives you a static shock!!

Laters
 08 October 2011 07:43 PM
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weirdbeard

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Originally posted by: OMS

BS 7671 doesn't require it, common sense doesn't require it - so leave the bloody thing unbonded and just crack on

regards

OMS


Hear, hear!
IET » Wiring and the regulations » B&Q's sink requires earthing....

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