basically says no alterations or additions shall be to an existing installation made unless any existing equipment which will have to carry additional load is adequate, and the earthing and bonding is adequate
The looks you get!!
- Thread starter nozspark
- Start date
130-07-01 No addition or alteration, temporary or permanent, shall be made to an existing installation, unless it has been ascertained that the rating and the condition of any existing equipment, including that of the distributor, which will have to carry any additional load is adequate for the altered circumstances and the earthing and bonding arrangements are also adequate.
So good luck signing a certificate for alterations to an installation with no main bonding and no chance of correct disconnection times...
So good luck signing a certificate for alterations to an installation with no main bonding and no chance of correct disconnection times...
S
saxondale
but BAS also says you dont need to use 130-07-01
If you are working to BS7671 then 130-07-01 is a fundamental principle.
No you don't - you could work to a different set of standards which also provide reasonable safety, and maybe one of those doesn't require main bonding.
I'd be surprised, however, if in this day and age any of them don't provide for maximum disconnection times, which a TT installation with no RCD is going to struggle to meet.
But I'm assuming that most professional electricians in this country will choose to work to BS7671, and will want to issue certificates saying that the work for which they have been responsible is to the best of their knowledge and belief etc etc...
Totaly agree
...and because as electrical engineers we have no powers to make anyone change anything all we can do is offer advise. And if the customer chooses to ignore the advise all we can do (as nozspark has done) is walk away.
S
saxondale
such as ? - genuine question
Those of any member of the EEA are obviously OK.
Those of any CENELEC member should also be easy to justify.
Australia, NZ - it would be hard to argue that their standards were unsafe.
Those of any CENELEC member should also be easy to justify.
Australia, NZ - it would be hard to argue that their standards were unsafe.
there is an "earth free" method used in some electronics factories round here
I can't remember how it's done though. As far as I can remember the idea is that with no earth, a person can't provide a path to earth through his body in the event of a fault. You have to be very careful not to introduce an earth potential by mistake.
The site below gives a good description. It's noticeable that as anaesthetics became safer (less flammable) in the 1980s then some electrics in some theatres "drifted" into incorporating earths, whilst conducting floor surfaces were used in repairs. Ether is still used and other gases are flammable. This has resulted in injuries and (I believe) one death.
V
www.touchbriefings.com/pdf/13/hosp031_p_HOFHEINZ.PDF
V
www.touchbriefings.com/pdf/13/hosp031_p_HOFHEINZ.PDF
Firstly I am not an electrician and am prepared to be shot down . .
Going back to the original post surely all you need to do is add a single RCD in the supply to his consumer unit and install the bonding giving protection to current standards.
Surely it is not necessary to upgrade the CU. Might not be ideal if a blown bulb trips his whole supply but that is his choice.
Going back to the original post surely all you need to do is add a single RCD in the supply to his consumer unit and install the bonding giving protection to current standards.
Surely it is not necessary to upgrade the CU. Might not be ideal if a blown bulb trips his whole supply but that is his choice.
That would do.
'mmmm, except that this introduces a different set of risks: that all power will be cut and all lights will go out in the event of an earth fault, including circuits which are not faulty. This brings hazards if you are for example: lifting baby or disabled person in or out of bath; up stepladder; lifting heavy object; running downstairs; lifting cooking pan of boiling water or hot fat; operating some machinery; using knives; lighting the Christmas pudding 
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