RCBO Tripping

[Kkiernan09369]

Hi all, new here, looked over the forums and on google couldn’t find much Info.

I have a consumer unit where the sockets, cooker and shower are protected by an RCBO.

I had to replace to sockets with ones that have built in USB. So switched off the MCB for sockets (as you would) I would have switched of the mains but the missis was roaring a joint.

When I removed the existing socket I accidentally touched the nuetral and earth cable together. But didn’t think anything of it untill two hours later when the missis noticed the oven was off.

Some How the RCBO had been tripped.

So I reset everything. Switched the sockets mcb to off and replicated the earth and neutral touching and sure enough it tripped the RCBO.

Why would this happen if the MCB was switched off?

I’m asking to double check that this shouldn’t happen and there may be a fault along the lines somewhere?

Or should it happen?
And before anyone says “your not a sparky, don’t be playing with electrics” I was only changing a socket face plate it’s no big deal I’ve done it literally thousands of times in my life but never experienced this.

 

[Pete999]

Hi all, new here, looked over the forums and on google couldn’t find much Info.

I have a consumer unit where the sockets, cooker and shower are protected by an RCBO.

I had to replace to sockets with ones that have built in USB. So switched off the MCB for sockets (as you would) I would have switched of the mains but the missis was roaring a joint.

When I removed the existing socket I accidentally touched the nuetral and earth cable together. But didn’t think anything of it untill two hours later when the missis noticed the oven was off.

Some How the RCBO had been tripped.

So I reset everything. Switched the sockets mcb to off and replicated the earth and neutral touching and sure enough it tripped the RCBO.

Why would this happen if the MCB was switched off?

I’m asking to double check that this shouldn’t happen and there may be a fault along the lines somewhere?

Or should it happen?
And before anyone says “your not a sparky, don’t be playing with electrics” I was only changing a socket face plate it’s no big deal I’ve done it literally thousands of times in my life but never experienced this.

Looks like you accidentally instigated a N.E fault which would Trip the RCD

 

[Kkiernan09369]

Looks like you accidentally instigated a N.E fault which would Trip the RCD

And this will definitely happen when the MCB is switched off?

I’m wondering then , about a year ago I do remember the misses changing a light fitting and she called me up from work and the RCBO had tripped. But the light circuit isn’t on the RCBO side

 

[buzzlightyear]

And before anyone says “your not a sparky, don’t be playing with electrics” I was only changing a socket face plate it’s no big deal I’ve done it literally thousands of times in my life but never experienced this.

hoops , not again ..

 

[littlespark]

First of all, it’s an RCD, which covers a number of circuits each with its own mcb.
An RCBO is an rcd and mcb combined.

Second. An mcb only disconnects the live, where the rcd is detecting an earth fault on the live AND the neutral, the neutral still being connected when the live is off.

I just had a dumb moment and thought your missus was ROLLING a joint, not roasting.

So, back to the rcd... it will trip off on a neutral - earth short as well as a live to earth.

 

[Kkiernan09369]

Thank u all set my mind to rest. RCBO RCD MCB if I knew it was a rcd not a RCBO then I might not be here asking the above question. thank you anyway and thanks for educating.

 

[buzzlightyear]

pop corn ready ,its now sorted.lol.

 

[Kkiernan09369]

View attachment 50487 pop corn ready ,its now sorted.lol.

I don’t get it

 

[buzzlightyear]

RCDs Explained | Electrical Safety First - https://www.----------------------------/guidance/safety-around-the-home/rcds-explained/ this should explain .

 

[buzzlightyear]

I don’t get it

I thought I need to pop it in just in case .

 

[Kkiernan09369]

[QUOTE="buzzlightyear, post: 1552599, member:[/QUOTE]
Just didn’t know the reference of the popcorn and the going to prison

 

[buzzlightyear]

electdickarty you cant smell it ,unless some body gets hurt ,has for gas you can smell it if the chicken is cooked .lol.

 

[littlespark]

electdickarty you cant smell it ,unless some body gets hurt ,has for gas you can smell it if the chicken is cooked .lol.

You don’t smell gas, actually, Buzz.... the smell is artificial and is added to gas so you know if it’s leaking.

When it comes to calor gas cylinders, when it’s really smelly, then you know the cylinder is empty of gas, not as most people would think, more smell equals more gas

 

[MJPD29]

Your missus smoking joints while your working hard. Doesn't sound fair to me

 

[buzzlightyear]

You don’t smell gas, actually, Buzz.... the smell is artificial and is added to gas so you know if it’s leaking out of some body

my my little spark I did not know you are a connoisseur of gas, I bet you could smell it from 20yards when people pass wind .

 

[telectrix]

I don’t get it

join the club. even 40 years' experienced sparks don't get some of his posts.

 

[littlespark]

my my little spark I did not know you are a connoisseur of gas, I bet you could smell it from 20yards when people pass wind .

You pick up a few little tips from working on a caravan site for a decade. Like it seems acceptable to be smoking a cig while working on a “live” gas pipe.... the supposed gas safe engineer we employed always did

 

[telectrix]

You pick up a few little tips from working on a caravan site for a decade. Like it seems acceptable to be smoking a cig while working on a “live” gas pipe.... the supposed gas safe engineer we employed always did

and if he's still alive????? a lit smoke is a good indication of a gas leak. it glows brighter.