UK RCBOs and TT systems

[default]

Hello. Just a quick question, when using RCBOs in a TT system does the max permitted Zs change? For example the max permitted Zs for a 32a type c RCBO in a TN system is 0.68, does this change to 1667 in a TT system?

 

[mainline]

It's the use of the rcbo that changes the max zs.

 

[default]

Does the max permitted Zs of an rcbo change to 1667 on a test sheet when used in a TT system? Please no cryptic jedi answers.

 

[mainline]

Does the max permitted Zs of an rcbo change to 1667 on a test sheet when used in a TT system? Please no cryptic jedi answers.

Yes.

 

[default]

Thanks

 

[James]

Yes.

or in fact, NO!
it is 1667 on any earthing system I can think of other than something a bit special like some IT
(independent of terra, not Information Technology!!)

@default May the force be with you.

 

[mainline]

or in fact, NO!
it is 1667 on any earthing system I can think of other than something a bit special like some IT
(independent of terra, not Information Technology!!)

@default May the force be with you.

How about one that has only mcbs ? aka yoda.