S-type RCBOs

[peterinreading]

Does anyone make S-type RCBOs?

For discrimination you should use an S-type RCD to protect a sub-main feeding a CU with a normal 30mA RCD or RCBOs. This can be handled with a 100mA 100mSec S-type RCD. It would be convenient if this were combined with a type B or C 63 amp MCB.

This is in a domestic context with a main DB feeding a number of CUs.

 

[Octopus]

Thanks for all your comments. Looks like a combination of tactics may be required as IssyS says: add mechanical protection where feasible, re-route the submains where feasible, or otherwise change the cables for SWA. Whatever tactic is used, the S-type RCDs don't add any useful additional protection and therefore the question I asked of whether S-type RCBOs are available is irrelevant.

Try answering my question!

If the distribution circuit is existing why are you looking to add RCD protection?

 

[davesparks]

Why are you dead set against adding 30mA protection to the submains?
If the installation is divided across multiple boards then it's no different to dividing it across a twin RCD split board

 

[Dave OCD]

It's equally likely that each sub main is feeding a complete flat or dwelling so in that situation having a remote 30ma RCD feeding complete CUs would at best be hugely inconvenient in the event of tripping and at worst dangerous.