C
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 ?
