Rcd protecting new ring main

[davek]

Hi all,
I have been to look at a job, in a unit who require extra socket in a office. It is one of those building that has been split into small units,
The supply is 3ph. Each unit is supplied from mains with separate meters and a 3pole isolation switch with bs88 fuse 63a.
the board is a merlin gerin isobar 4c. the breaker are c60hb. my thought where rcbo but I can only get a c rated 32a which using table b6 gives me 0.58 ohms the zs at supply to board is 0.18.any thought or suggestions.
thanks
Dave

 

[bigdavs83]

They make them in various sizes, 6,10,16,20,25 32,40,50,63..... in 'b', 'c' and 'd' types.

I think we all know they make them in differing sizes to suit the application however he is struggling to get different from a type c. Or I'm reading the OP wildly wrong lol

 

[telectrix]

just spotted an extra zero in my post. didn't realise my fingers stutter. must be the cold.edited now.

 

[davek]

I believe Schneider fit the merlin is there any others.

 

[Deleted member 72666]

just spotted an extra zero in my post. didn't realise my fingers stutter. must be the cold.edited now.

And there's me thinking you'd found a new reg number from amendment 3! lol

 

[davek]

just spotted an extra zero in my post. didn't realise my fingers stutter. must be the cold.edited now.

lol I spotted it but new what you meant, its I strange board post on lol

 

[telectrix]

the schneider do fit.

 

[bigdavs83]

Schneider bought over merlin gerin so is essentially the same make. It's not a good idea to try to get another make to fit the db as its not to manufacturers instructions therefore any issues with it in the future it'll be your name on the sheet saying that's ok.

 

[Plonker 3]

It's not a good idea to try to get another make to fit the db as its not to manufacturers instructions therefore any issues with it in the future it'll be your name on the sheet saying that's ok.

Strewth not that old chestnut again, as long as the OCPD fits correctly there is no problem with this.

That rumour needs putting in the same place as cuttting off a plug top i validates the warranty.

 

[telectrix]

it's still a get-out for the manufacturers in case of trouble. they can afford high powered lawyers. we can't.

 

[bigdavs83]

Strewth not that old chestnut again, as long as the OCPD fits correctly there is no problem with this.

That rumour needs putting in the same place as cuttting off a plug top i validates the warranty.

i'd fail it straight away. It's not to manufacturers recommendations. If the manufacturer recommended that you don't do it a certain way and you do it that certain way then you are setting up for a big fall should it go wrong. Looks guff as well

 

[Engineer54]

i'd fail it straight away. It's not to manufacturers recommendations. If the manufacturer recommended that you don't do it a certain way and you do it that certain way then you are setting up for a big fall should it go wrong. Looks guff as well

And if the MCB's/RCBO's are essentially manufactured in the same factory on the same production lines, on the same machines, only the manufacturers logo and part/model numbers etc, differ??

You'd be surprised just how many so-called manufacturers use 2nd party manufacturing company's to supply their own products and licence product production for 3rd party manufacturers.

 

[old_sparky_RE]

I'm with Dillb on this...is it fit-for-purpose ? If yes fit it.

I don't invite all my friends (yes both of them) to look at my DB, so I don't care what it looks like as long as it is safe for my family and the wife can reach a tripped circuit with a stick :cheesy:

Its a recommendation ("this may invaladate the warrenty") not mandatory, its just another reason for them to try and weasel there way out with their shoddy product.... and don't get me started on fans and 3A fuses.

 

[ipf]

At the last NIC visit I was told that installing a different 'make' of breaker was a no no, even if it was the same breaker labelled differently...................I laughed.....then went outside and had a whistle.
Schneider IS Merlin.

 

[Plonker 3]

i'd fail it straight away. It's not to manufacturers recommendations. If the manufacturer recommended that you don't do it a certain way and you do it that certain way then you are setting up for a big fall should it go wrong. Looks guff as well

Care to explain what you would "fail" it on?

 

[Guest77]

i rarely use upper case letters. can't be arsed.

We know

 

[Guest77]

i'd fail it straight away. It's not to manufacturers recommendations. If the manufacturer recommended that you don't do it a certain way and you do it that certain way then you are setting up for a big fall should it go wrong. Looks guff as well

LMAO, really, what a lot of tosh.

 

[Guest77]

Care to explain what you would "fail" it on?

It is a different colour lol, absolutely identical otherwise and made in the factory on the same machine and inspected by the same person but slightly different in colour so it is now dangerous, oh and it is your name on the test sheet :smilielol5:

 

[telectrix]

nissan recommend shell oil in their engines. i put castrol in mine. does that invalidate the warranty?

 

[Guest77]

nissan recommend shell oil in their engines. i put castrol in mine. does that invalidate the warranty?

That depends where you buy it from, is it a Shell endorsed garage or shop? :smilielol5:

 

[telectrix]

ebay. it's cheaper . a bit black though.