Rcbos in a tt system

[Welchyboy]

is there anyone who can clarify the debate about single pole rcbos on a tt system???

i have a main 300mA s type DP rcd at origin and wanted to use rcbos on sub main cu's in other buildings instead of using a single 30mA device to protect a whole cu

as a whole board going down would be an issue

page 16 of the OSG shows a tt set up with rcbos without even a main 100mA rcd being used, so whats the problem?

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[davelerave]

i think the issue is that the single-pole rcbos downstream don't clear the N-E fault

 

[Welchyboy]

No...got it being a **** didnt think!! thanks

 

[Chr!s]

They also allow for isolation.

Regards |Chris

 

[SirKit Breaker]

Fit DP RCBO's!

 

[La Poste]

Can anyone recommend a double pole RCBO, they seem to be hard to come by these days.

Thanks.

Edit here's some:

http://compare.ebay.co.uk/like/300608485162?var=lv&ltyp=AllFixedPriceItemTypes&var=sbar

 

[Engineer54]

I think you'll find, all the manufacturers supply them. I've just looked up 2 apart from your link, and both had DP RCBO's listed!!!

 

[La Poste]

I think things must be changing because they used to be much harder to get hold of in the past, going back maybe three years or so, hard to get from the wholesalers in the UK I mean, they would only stock SP RCBO's.

 

[Chr!s]

Try Single Pole, switched neutral RCBO'S

 

[jamie-spark]

Single pole rcbo's are alowed pn tt systems. Lenny posted a link to a thread about this subject a week or two ago