Rings or Radials ....

[123]

Only problem with 35mm boxes , not so good on the single skin walls , very easy end up in next room

Are you chasing the walls with a jack hammer or something?

 

[Dozer 73]

Are you chasing the walls with a jack hammer or something?

Of course , why what do you use
Residents aren’t usually too happy with a compressor in their living room though

 

[123]

I fit the Control Gear units - as Lee says - a small premium, for a simpler set up and far easier to fault find when it starts tripping.

What do you fit if it's TT?

 

[123]

Of course , why what do you use
Residents aren’t usually too happy with a compressor in their living room though

Wall Chaser and SDS Chipping Hammer - have yet to burst into the next room with 35mm deep boxes

 

[Dozer 73]

Can’t say I’m an expert on the house bashin so I,ll stand corrected
And probably leave it to the specialists

 

[Octopus]

What do you fit if it's TT?

not had one yet but I'm thinking 100 mA RCD in place of the 100a dp switch

 

[Leesparkykent]

not had one yet but I'm thinking 100 mA RCD in place of the 100a dp switch

Wouldn't be a good idea with them control gear RCBO's due to not being double pole or SPSN. The new wylex compact RCBO's are SPSN I believe.

 

[Ian1981]

deleted

 

[westward10]

Wouldn't be a good idea with them control gear RCBO's due to not being double pole or SPSN. The new wylex compact RCBO's are SPSN I believe.

Does that matter if they are only being used for circuit protection and not isolation with the main double-pole rcd supporting them.

 

[Leesparkykent]

Does that matter if they are only being used for circuit protection and not isolation with the main double-pole rcd supporting them.

well yeah unless you want the whole board tripping in the event of a neutral-earth fault...RCBO trips, as it's solid neutral the neutral isnt disconnected so takes out the upfront time delayed RCD.

 

[Midwest]

I can get a 10way lewden/control gear board with 8 RCBO's for £99

My local wholesaler only stocks MK, Wylex and some Hager stuff, unfortunately.

 

[Midwest]

Are you chasing the walls with a jack hammer or something?

The internal walls on a local residential estate (circa 1985), which I do a fair bit of work on, are made up of three pieces of 12mm plasterboard, stuck to each other

 

[Midwest]

well yeah unless you want the whole board tripping in the event of a neutral-earth fault...RCBO trips, as it's solid neutral the neutral isnt disconnected so takes out the upfront time delayed RCD.

My memory is a bit hazy, but I recall the 18th draft mentioning something about this subject? Guess division of installation would still have to be considered.

 

[stevethesparks]

Tried my fist SBS DP rcbo board this month, and am quite pleased with it. Mine was on a TT system, and I used a time delayed 100mA RCD as the main switch. The install was made easier and looked neat without all the wandering tails and functional earth leads from the rcbo's. Good price and quick delivery.

 

[suffolkspark]

if you've got TT you can fit a full RCBO board and LEAVE the 100A DP switch upfront unchanged.

if you've got a dual RCCB board, that is when you need to change the upfront 100A DP to a 100mA type S.

 

[Adj]

35mm boxes always - but the the dot and dab boys don't half cuss when I don't sink them in.

 

[Leesparkykent]

My local wholesaler only stocks MK, Wylex and some Hager stuff, unfortunately.

Change wholesaler ....I get them from Electric centre. My local branch stopped stocking MK as everyone moaned about them. On the shelf they now keep Hager and Lewden.

 

[sam400]

if you've got TT you can fit a full RCBO board and LEAVE the 100A DP switch upfront unchanged.

if you've got a dual RCCB board, that is when you need to change the upfront 100A DP to a 100mA type S.

What’s the thinking behind this?

Cheers

 

[suffolkspark]

What’s the thinking behind this?

Cheers

In a dual RCCB board you have the brown and blue link leads between the main switch and the RCCB's and neutral bars IF any of these were to come adrift or melt or be nibbled, and come into contact with the metal, then the only protective device is the service head fuse, and on TT you can be pretty sure you wont have a low enough Zs to allow enough current to flow to blow it so it will just sit there live all day long. in this instance the 100mA type s gives those internal link wires fault protection, and also maintains discrimination from your 30mA RCCB's.

With a full RCBO board there are none of these internal links so no need for upfront protection, and as somebody mentioned if you use single pole RCBO's and DO fit an upfront 100mA type S RCCB, you havn't got discrimination as the neutral will be left in circuit if the RCBO trips which could trip the 100mA.

In both instances a gland should be used on the incoming tails.

 

[Toneyz]

The internal walls on a local residential estate (circa 1985), which I do a fair bit of work on, are made up of three pieces of 12mm plasterboard, stuck to each other

I remember those walls nightmare for installing boxes.