Dual board with no earth on final circuits

[Sparksaflyin]

Hi guys. Need to change the fuseboard at my parents house but none of their final circuits have a cpc run to them. Obviously have an earth on the main incoming so I can get a 16mm earthing conductor up to my new 18th edition metallic consumer unit but they don’t want a rewire so none of the final circuits will be protected with an earth.

My question is will this be an issue in the functionality of the rcds? Obviously the rcd functions on an imbalance between live and neutral so as far as I’m concerned it shouldn’t be too much of an issue hopefully, just wanted to get some of your opinions on the matter.

Another issue I can see is how I’m supposed to test for disconnection times without an
earth?

Opinions would be greatly appreciated

Thanks

 

[Sparksaflyin]

And they're still like this, and you being a sparky ? Have you been peeking at the will or something ?

Yes they are still like it stubborn as an old goat is my dad. What can I say

 

[telectrix]

just check the other circuits. bet you they all have cpc's. then if they insist on metal switches, check that their wills are in order.

 

[Sparksaflyin]

yep. RCDs don't need earths/cpc's . the human body provides the earth path to provide the imbalance.

Lovely stuff! So as long as I make a note of it on the doc and the ---- pile of other stuff I’m sure to find, my --- is covered?

 

[telectrix]

Not entirely sure how to take that

having just read post#31, maybe i should have said goat instead of pork.

 

[davesparks]

So In terms of the functionality of the rcds, you can’t see this being an issue? I would assume that if any exposed/extraneous conductive parts do become live and someone touches them and creates a fault path, that the rcd will pick up on this imbalance regardless?

Yes if someone touches the parts and receives an electric shock the RCD will operate once the shock has become severe enough. And if that person is in good health they will find the experience painful but likely survive, if they are not in good health or they have a weak heart they may well not survive the experience.

 

[Andy78]

Yes they are still like it stubborn as an old goat is my dad. What can I say

Be stubborn back then. Tell him no board swap unless cpc added or at the very least all metal accessories changed to plastic.
Show him the electrical safety first guide to help persuade that a real danger presently exists and that the correct course of action should be followed.

 

[telectrix]

Lovely stuff! So as long as I make a note of it on the doc and the **** pile of other stuff I’m sure to find, my --- is covered?

you go to work on an ---? i thought even essex had horses these days.

 

[Sparksaflyin]

just check the other circuits. bet you they all have cpc's. then if they insist on metal switches, check that their wills are in order.

If I end up changing the board I will remove all the metal switches and replace with Plastic while he’s not looking. Like I say though, for arguments sake, the rcd will still protect against this? Only problem being I can’t really test the theory out without an earth?

 

[Markyd]

No wonder you call yourself sparksaflyin.........change the metal lighting fittings back to plastic until you replace the CU....Then leave them on

 

[Andy78]

Lovely stuff! So as long as I make a note of it on the doc and the **** pile of other stuff I’m sure to find, my --- is covered?

A note on a cert cannot excuse you from the responsibility of not doing your job properly or leaving an unsafe condition.

 

[Sparksaflyin]

you go to work on an ---? i thought even essex had horses these days.

We do mate. Ship them all from up north.

 

[telectrix]

We do mate. Ship them all from up north.

silly arse. them's not horses, they's northern women

 

[Markyd]

Lovely stuff! So as long as I make a note of it on the doc and the **** pile of other stuff I’m sure to find, my --- is covered?

What a great attitude to have.......im done ..im out

 

[Sparksaflyin]

No wonder you call yourself sparksaflyin.........change the metal lighting fittings back to plastic until you replace the CU....Then leave them on

They’ll all be plastic by the time I’m done. He won’t be so stubborn once he knows my names tied to it. ( hopefully )

 

[davesparks]

, the rcd will still protect against this? Only problem being I can’t really test the theory out without an earth?

No, in this situation an RCD disconnects the circuit once a person is already receiving an electric shock. A 30mA RCD disconnects the supply before the shock reaches a level that is not normally fatal for a healthy adult.