Having a debate; Is there a difference between pre-insertion resistors and closing resistors in circuit breakers?
It seems as though most manufacturers are relying more on switch sync devices instead of any mechanical resistors (pre-insertion or closing) for 345 and 500 breakers. Without...
i have an aluminum block that is tin plated. starting to show signs of white corrosion. i have been told that it is normal for tin plating to show corrosion based on environmental conditions.
two questions:
1. can anyone confirm or deny that tin plating can corrode?
2. is there an easy test, i...
We are Doble testing a gas CB for power factor. We are getting a 'bad' result on one of the bushings at full pressure. All of the others are getting 'good' ratings. When we take the pressure down to 5psi, it passes. We are getting a new tank of gas from the manufacturer.
Has anyone run into...
