Earthed metal protection

[ianphilip007]

hi there

may need to bury some meter tails in wall (25mm 16mm earth), not my usual practice, now they will not be below 50mm so they will need earthed mechanical protection. can any one advise as whats best to use for mechanical protection and the size of the earth cable required for earthing it ?

many thanks

 

[oxocube]

Are you just spouting off your opinion, or can you back up what you say with any facts?

Read chapter 41. I find it hard to believe that any spark can think that unearthed metal covers/containment for plastic sheathed cables complies with regs and is safe.

 

[Deleted member 26818]

Read chapter 41. I find it hard to believe that any spark can think that unearthed metal covers/containment for plastic sheathed cables complies with regs and is safe.

I'll take that as a no then.

 

[oxocube]

What do you think 'Read chapter 41 'means. On the other hand ignore my advice, the uk will be a safer place when you're inside for manslaughter.

Are you an electrician?

 

[Deleted member 26818]

What do you think 'Read chapter 41 'means. On the other hand ignore my advice, the uk will be a safer place when you're inside for manslaughter.

Are you an electrician?

It says I am on my JIB card, what's it say on your JIB card?

 

[oxocube]

The last one I had said 'electrical technician', and I see you've swerved away from your lack of knowledge problem.

I'm not really interested in continuing a conversation with someone so ignorant of the basics of safe electrical work. God help people using your installations.

 

[mickys86]

It's Friday night.... The beers must be flowing !! 

 

[Deleted member 26818]

The last one I had said 'electrical technician', and I see you've swerved away from your lack of knowledge problem.

I'm not really interested in continuing a conversation with someone so ignorant of the basics of safe electrical work. God help people using your installations.

Not aware we were having a conversation.
As far as I'm concerned all you've done is spouted some inane opinions, and made some derogatory comments.
Now if you could actually back your opinions/comments up with some coherent argument, then I might consider engaging in conversation with you.
Unfortunately suggesting somene reads the chapter that relates to providing protection against electric shock, when the thread is about providing additional protection to cables concealled in walls, just doesn't cut it as a coherent argument.

 

[KFH]

I agree that spinlondon is right. The regs do not state that the protection against screws and nails needs to be earthed. Whether one would earth it as a matter of principal is a different discussion.

 

[rob121]

I agree that spinlondon is right. The regs do not state that the protection against screws and nails needs to be earthed. Whether one would earth it as a matter of principal is a different discussion.

Agreed! Although as someone said you might find one idiot would drill straight through it. Was working on a flat in london where it was supplied via T+E that wasnt RCD protected. Ended up buying a couple of sheets of 600X400mm 3mm thick sheets to protect upto the CU, which was then just plasterboarded over. Meant it was protected both sides and I think it cost less than 20 quid. Could have drilled it and put a crimp on some 10mm cable but didnt at the time.

 

[oxocube]

I find all this very hard to believe, the cables are buried less than 50mm deep. Therefore there are only two alternatives;

1, They should have 30mA rcd protection, but that would not comply with various regs in sect 132 regarding separation of circuits and convenience, so is unacceptable.

2. They must be enclosed in earthed metal as specified by regs 522.6.7, 7 and 8 and various regs in sect 41.

And with that I'm out.

 

[rob121]

Oxo, I believe Spinlondon is refering to the same reg you are. If you read 522.6.6 (iv) be mechanically protected against damage suffiecient to prevent penetration of the cable by nails. screws and the like. Doesnt mention it has to be earthed. Unless theres a reg that over rides that, that ive missed? Im only a newbie so correct me if im wrong.

 

[wade88]

all can be resolved with a fight to the death armed with nothing more then a 1m piece 1.5 T+E and whatever you can find in your lunchboxes.... ding ding seconds out. my money is on spin, he rides a big bike...must be tough and bearded? probably has a brick in his lunchbox

 

[oxocube]

Oxo, I believe Spinlondon is refering to the same reg you are. If you read 522.6.6 (iv) be mechanically protected against damage suffiecient to prevent penetration of the cable by nails. screws and the like. Doesnt mention it has to be earthed. Unless theres a reg that over rides that, that ive missed? Im only a newbie so correct me if im wrong.

I have some self drilling screws that will drill into RSJ's, and will go through 3/4mm steel in seconds. Thats another reason why it should be earthed.

 

[oxocube]

all can be resolved with a fight to the death armed with nothing more then a 1m piece 1.5 T+E and whatever you can find in your lunchboxes.... ding ding seconds out. my money is on spin, he rides a big bike...must be tough and bearded? probably has a brick in his lunchbox

I've only got a handbag and a moped.

 

[wade88]

I've only got a handbag and a moped.

hang bag round the bonce at 31 mph could do some serious damage!