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right thanks      i will look at books soom more  . thanks for the help .

poni thanks for that i have bean deviding the In =32 not the Iz=62             done it 3 times        . thanks again

It is

Hi all just a small question can some one just check my working out Ib. = 30 In = 32 It = 24a Iz=62a. Ca=0.79 Cg=0.60 Is the IT. 24a. Right or am I missing some thing just seams a bit low Thanks.

Sorry nozspark. I have to design a circuit. Design current is 38 A Do I need to use a 40 A. As a protective device i n .

Ib is 38a value of p d is ? Can not find a c mcbs to this 38a . I know you can not go eney lower than this ib can I use a mcbs of 40 a. Thanks. Eney help .

Thanks . Having a bad day. . It's in bs7671 ; 2008

Hi all just a sort one . Can sum one help me understand wot the protection Ip2x. Or ipxxb mean . Looked all through books can't find a thing about it .