2 amp mcb max Zs ?

[craig]

Can anybody tell me the max Zs allowed for a 2 amp BS 60898 mcb ? All tables I have start at 5 amp ?
Thanks in advance !

 

[MarcT]

use 46/In for a type B and 23/In for a type C

 

[craig]

Thanks. - Seem a bit high ? Where did you get the info ?

 

[MarcT]

page 49 of the red book. the forumula is usually used for breakers higher than 125A but it works but it's linear so it works throughout. so you could take the value for 10A and multiply by 5 for 2A