RCBO installtion in old MCU following EICR Report

[westward10]

Westward 10 mentioned 12 way busbar and thats what my electrican thought as well but it didn't fit. 15 way busbar was too big he said. He would not have changed just 4 RCBOS on the left, he said he was going to change to 6 x RCBOs by taking out the two RCDs on the right and the RCCBs so leaving just the main switch as is and 6 x RCBOs as there is a chance of tripping he said if the RCDs were left however the plan didn't work which is a shame as I was hoping to avoid disturbing the walls so next week it will be the Fusebox F2020MX board with the mounting frame installation.

Why wouldn't he change the four on the left seems the most obvious thing to do. You cannot remove the existing RCD just leave it.

 

[davesparks]

there is a chance of tripping he said if the RCDs were left

Do you have any tripping problems at the moment?

If there is currently no tripping problem then replacing the first 4 MCBs with RCBOs will not change this. The chance of nuisance tripping after this work will be exactly the same as it is before.

 

[westward10]

What reason have they given for replacing the RCD?

 

[MDJ]

Hi,

I recently had an EICR done at my property which unfortunately was unsatisfactory. So the electrican advised a new fuseboard from BG General or Fusebox

This has bothered me a bit Dean, why was the installation unsatisfactory? I generally am interested in why, can you take some pictures of the report and upload it as I like to know these things, lol yes I am a bit nosy

 

[westward10]

You can actually move all circuits to the left and fit RCBOs.

 

[Deanp35]

Why wouldn't he change the four on the left seems the most obvious thing to do. You cannot remove the existing RCD just leave it.

He advised everything needs to be taken out so that we have 6 - RCBOS and just main switch. The explanation that was given to me is that you can't have 4 - RCBOs and those current existing 2 RCDs for the sockets on the right due to increased risk of tripping. I don't know if that is true but thats what he advised and plus we still have the issue with the new bus bar not fitting current board. A new one won't fit and presumably the current existing bus bar can't be used for installing new RCBOs as a new 12 way one was advised but unfortunately didn't fit.

 

[Deanp35]

Do you have any tripping problems at the moment?

If there is currently no tripping problem then replacing the first 4 MCBs with RCBOs will not change this. The chance of nuisance tripping after this work will be exactly the same as it is before.

No tripping issues with current board. But we still have the issue with the new 12 way crabtree bus bar as it didn't fit the board and new RCBOs can't be installed on existing current bus bar.

 

[Deanp35]

This has bothered me a bit Dean, why was the installation unsatisfactory? I generally am interested in why, can you take some pictures of the report and upload it as I like to know these things, lol yes I am a bit nosy

No protection on the first four MCBs, plastic unit (front cover lid) and no SPD from what I recall.

 

[westward10]

He advised everything needs to be taken out so that we have 6 - RCBOS and just main switch. The explanation that was given to me is that you can't have 4 - RCBOs and those current existing 2 RCDs for the sockets on the right due to increased risk of tripping. I don't know if that is true but thats what he advised and plus we still have the issue with the new bus bar not fitting current board. A new one won't fit and presumably the current existing bus bar can't be used for installing new RCBOs as a new 12 way one was advised but unfortunately didn't fit.

Nothing physically needs changing. Starbreaker compact RCBOs will directly fit. Replace the four left side mcbs with RCBOs and move the right two to the two left side spare ways, the latter may not be necessary but it will take the type AC RCD out of the equation. The solution is so simple I cannot understand why they cannot see it.

 

[westward10]

No protection on the first four MCBs, plastic unit (front cover lid) and no SPD from what I recall.

How have they Coded this it should be no more than Code 3.