What is this and is it normal? Council electrics

[RyanA]

It's been almost 4 years since the council updated all the electrics in the house, at the time they moved the fuse box to the back wall rather than the side wall. Today curiosity got the better of me and I'm just wondering what this is, as it doesn't look normal. At the time a council inspector looked everything over and said it was OK.

Basically wires coming through the wall where the fusebox used to be, going into this little bar with screw things on it, they just plastered over all the wires. From the little bar are more wires going into the fusebox.

What is this, and is it normal/safe?

 

[Deuce]

You used the word "potential" in your post

Food for thought If someone were to touch the earth bar, what else could they touch that can cause a potential difference to expose them to harm

The outer metal case of anything else plugged in and earthed - I did think about that

But it's still going to want to take the most direct route to earth, which is via that earth terminal. So I'd rather be touching outer case of anything else plugged in and earthed than that terminal the earth circuit became live.

 

[Jay89]

Out of interest, how is that not potentially dangerous if there were a fault that led to the earth terminal carrying current? It is surely only there as it 'may' one day need to carry current.

Ignoring the RCD protection that must be present on the new box anyway, as that can fail and the earth terminal could carry current undetected for a length of time in some situations.

Just curious as to how that is safe?

They are there as a direct path to earth. I presume the other two cables leaving the terminals will be the main bonding to the other services, which will have exposed metal parts also.

You would hope as the installation has been signed off by an inspector that any fault current would trip the RCD

 

[Amp David]

The outer metal case of anything else plugged in and earthed - I did think about that

But it's still going to want to take the most direct route to earth, which is via that earth terminal. So I'd rather be touching outer case of anything else plugged in and earthed than that terminal the earth circuit became live.

 

[buzzlightyear]

why are people complaining about the state of the electrics when people living ruff on the streets .bugs me

 

[Gavin John Hyde]

the walls were that damp we had to screw it all to walls as the stuff kept falling off!

Reliance on stick on trunking
Can't rely on the sticky stuff best to always drill trunking to the wall

There again,maybe I drill it only because I'm used to the damp walls in these parts

Haha... It was done by council on a contract i was on. They were bit funny at first when it all came off. When we started screwing they moaned about time and cost of screws and plugs.. . It was a case of as cheap as possible and as quick as possible. The old stuff was all left in place with backboxes filled with plaster. I dread to think what happened to that block of flats... Council barely maintained it..

 

[Deuce]

They are there as a direct path to earth. I presume the other two cables leaving the terminals will be the main bonding to the other services, which will have exposed parts also.

You would hope as the installation has been signed off by an inspector that any fault current would trip the RCD

Yes I mentioned the RCD earlier, I agree it's not likely to ever become dangerous because it must now have an RCD. But RCD's are not 100% reliable, even if recently tested. It just seems crazy to leave the final part of the earth network of the entire house exposed like that. What is the point?

 

[Amp David]

Like i’ll say again

 

[Deuce]

why are people complaining about the state of the electrics when people living ruff on the streets .bugs me

It's an electricians forum - seems like the right place to focus on what is right and wrong with electrical installations, not society as a whole..

 

[Des 56]

You may need to think about that healthy old "Bird on the wire"

Then consider why we use cpcs and install bonding conductors to create a equipotential zone, what the fruits of having that zone means for our safety

Edited to give my opinion
Earthing and bonding is the age old and most reliable No 1 safety feature
Rcds are best thought of as maybe being necessary, but they are more of a back up rather than the main safety item

 

[Deuce]

You may need to think about that healthy old "Bird on the wire"

Then consider why we use cpcs and install bonding conductors to create a equipotential zone, what the fruits of having that zone means for our safety

Yes I'm sure there is a reason - I'm just asking (in layman's terms) what the reason is for leaving it exposed, and why it can't ever become live, if there is a fault in another connected appliance which leads to live travelling to ground, via that terminal. And for arguments sake there is no RCD/faulty RCD.

 

[Amp David]

What?

 

[buzzlightyear]

It's an electricians forum - seems like the right place to focus on what is right and wrong with electrical installations, not society as a whole..

It's been almost 4 years since the council updated all the electrics in the house"

I can see by the pics that was put on here .
if the op does not like it he can only ring the council and complain to them and see what they say.

 

[Leesparkykent]

Thanks but I'm still confused about this. I totally understand that having it visible/accessible means it's safe as far as inspection goes... And I understand that a bodge job to hide it could damage earth continuity and leave a greater potential danger.

But surely it is designed to carry current in certain situations, so it's not safe to be exposed. How can it be?

Why can't it just be mounted in the CU as in fairly typical these days. Surely that is safe in both regards?

It's an exposed conductive part...The shock protection is provided by automatic disconnection of supply (ADS).

ADS is the most commonly used protective measure and applies to most electrical installations.

Connecting together accessible metalwork of an electrical installation, that is, the exposed conductive parts and extraneous conductive parts which are bonded as part of the protective measure ADS, reduces the touch voltage in earth fault conditions.

 

[Jay89]

Yes I mentioned the RCD earlier, I agree it's not likely to ever become dangerous because it must now have an RCD. But RCD's are not 100% reliable, even if recently tested. It just seems crazy to leave the final part of the earth network of the entire house exposed like that. What is the point?

Depending on the earthing arrangement the final part (in the house) will either be the sheathing of the incoming cable or the neutral terminal inside the main head. I can’t say I’ve seen a domestic installation where the MET is completely enclosed.

As long as everything remains connected I can’t see that there is any danger

 

[Deuce]

It's an exposed conductive part...The shock protection is provided by automatic disconnection of supply (ADS).

ADS is the most commonly used protective measure and applies to most electrical installations.

Connecting together accessible metalwork of an electrical installation, that is, the exposed conductive parts and extraneous conductive parts which are bonded as part of ADS, reduces the touch voltage in earth fault conditions.

Thanks that all makes sense. But in an earth fault condition, that would still become live - and would be the last connected conductive part before ground. Does that not make it potentially more dangerous to be in contact with?

Edit I appreciate that no matter what most current will still want to travel to ground, not through anyone touching it - but there is still some low level risk of making contact isn't there?