Type 4 circuit breakers

[cambria]

In a small building used as an amusement arcade the CU contains twelve circuit breakers which are probably over 20 years old. The labels show they are Square D Q0-X Type and also instantaneous trip Type 4 . Are these type 4 as referred to in the OSG as not for general use, if they are there is a bit of problem as the Zs readngs are averaging about 0.7 ohms which is too high for a 30 amp type 4 breaker according to OSG. It is a TN-C installation Anyone got any info on these breakers ?

 

[Mac]

Had a look on the web mate.This is all i could find.
Square D Circuit Breaker: GE AK Circuit breakers

 

[cambria]

Sorted ! Scheider (Square D) sent me a full data sheet for their type 4 breakers showing trip currents Zs etc

 

[electricAl]

It is a TN-C installation Anyone got any info on these breakers ?

More out of curiousity than anything, do you mean TN-C (or TN-C-S)?

 

[cambria]

Sorry TN-C-S

 

[electricAl]

Intuition

 

[ICE]

Cambria,

You could'nt forward me a copy of the data sheet could you


Cheers


ICE