RCCB as main switch?

[Noob2013]

Hi all,

I have been to a property where the tails come out of the meter and into an RCCB which then feeds the main switch of the consumer unit. All circuits are protected by MCBs.

If I'm adding a new circuit, is it best put in an RCBO instead of an MCB?

Thanks

 

[Simlec]

Should this question not be on the Screwfix forum ?

You would use a MCB. But do you know why ?

 

[Guest125]

There should not be a 'front end' RCD installed at all. Circuits should be separated so that if a fault occurs the whole installation does not trip.

 

[Simlec]

There should not be a 'front end' RCD installed at all. Circuits should be separated so that if a fault occurs the whole installation does not trip.

Yes lets rip it all out and start from a fresh.. and then also get rid of the 100mA time delay RCD's from them old installs lol

 

[ImpededLoop]

Hi all,

I have been to a property where the tails come out of the meter and into an RCCB which then feeds the main switch of the consumer unit. All circuits are protected by MCBs.

If I'm adding a new circuit, is it best put in an RCBO instead of an MCB?

Thanks

Hi Noob,

A new circuit would need notifying under Part P of the building regs. As your profile shows that you're an apprentice you could maybe undertake this job with one of the electricians that you work with.

Also, if you don't already have it, get yourself access to the trainees forum.

 

[telectrix]

There should not be a 'front end' RCD installed at all. Circuits should be separated so that if a fault occurs the whole installation does not trip.

cobblers. this was most likely to regs. when installed. there's no requirement to bring it up to current regs. although any work done on the installation must comply to 17th.

 

[HandySparks]

What's the differential current rating of the RCCB?

 

[Guest125]

cobblers. this was most likely to regs. when installed. there's no requirement to bring it up to current regs. although any work done on the installation must comply to 17th.

"most likely"

good enough for you. Not good enough for me.

As soon as he disconnects the tails to the existing he must be happy with the current installation before he reconnects it.

Just my opinion.

 

[ImpededLoop]

Could be TT with a metalclad CU.

 

[HandySparks]

... and what's the purpose of the new circuit?

And the installation method?

 

[Octopus]

There should not be a 'front end' RCD installed at all. Circuits should be separated so that if a fault occurs the whole installation does not trip.

Reg number please?

 

[HandySparks]

... and earthing system?

 

[telectrix]

"most likely"

good enough for you. Not good enough for me.

As soon as he disconnects the tails to the existing he must be happy with the current installation before he reconnects it.

Just my opinion.

as long as it's safe for continued use. the fact that it was installed to a previous version of the regs. is no reason to condemn it. that's like condemning a 1990's car because it doesn't have abs or airbags.

 

[Simlec]

Hi Noob,

A new circuit would need notifying under Part P of the building regs. As your profile shows that you're an apprentice you could maybe undertake this job with one of the electricians that you work with.

Also, if you don't already have it, get yourself access to the trainees forum.

Can't we have an "Apprentice" badges Mods?

 

[Guest125]

Could be TT with a metalclad CU.

Then should be time delayed.

 

[Simlec]

"most likely"

good enough for you. Not good enough for me.

As soon as he disconnects the tails to the existing he must be happy with the current installation before he reconnects it.

Just my opinion.

Why would he/they be doing that?

 

[Guest125]

as long as it's safe for continued use. the fact that it was installed to a previous version of the regs. is no reason to condemn it. that's like condemning a 1990's car because it doesn't have abs or airbags.

Not condem but advise and make sure it is on the cert if the home owner does not want it.

 

[Guest125]

Why would he/they be doing that?

He said he wanted to install henly block after the meter and tap into the tails.

 

[Simlec]

He said he wanted to install henly block after the meter and tap into the tails.

Where does it say that ???

 

[Guest125]

Reg number please?

I will check tomorrow when in the office. But I am certain of this.