Breaking capacity of a 3871 breaker?

[telectrix]

Petulant Furry Cat.

 

[Top Cat]

whats the PFC here TC?

0.783kA

 

[Top Cat]

Petulant Furry Cat.

Bog Off!:6:

 

[GLENNSPARK]

put em down as 1kA then TC....its still compliant and you`v also covered yourself by putting em down as the lowest withstand.....

 

[Top Cat]

Started to put details in computer package:- Cooker-type of wiring A - Ref method 100 - Points served 1 - Live 6.0mm E 2.5mm - Max dis time 0.4 - BS No 3871 - Type (automatically comes up N/A) - Breaking capacity 3
Operating current 30mA. Now at this point it should automatically work out the Max Zs. But no it comes up as "Invalid combination"!!!!!!!!!

Now have i done anything wrong or should i bypass this and put in my own figure, trouble is i can't find Zs for 3871 breakers (tables) in BGB

 

[telectrix]

Operating current 30mA.


​should you not be entering the In of the 3871, not the RCD?

 

[telectrix]

if it's a type 1 BS3871, the max. Zs is 230/ 4In

 

[Top Cat]

Getting confused now! The heading is RCD operating current I(triangle)n

Can't find table in BGB, Where did you get that info Tel?

 

[telectrix]

deep in the recesses of what pretends to be a brain. as a type B 60898 is 5In, type C is 10In, the 3871's type 1 is 4In, type2 is 7In. can't remember the rest.

 

[Silly Sausage]

Here you go...