I am looking for any feedback from people using a contact type of voltage tester at voltages > 1 kv. The intent is for confirmation of isolation. What do you use? Have you tried any other contact type tester? What voltage range is this tester used upon? Any feedback on ease of use, reliability...
Recently we had an incident on a bus feeding multiple PWM style VFDs, motor loads and small transformers. The bus is high resistance grounded, limited to 2 A. Over a span of about 3 hrs, 3 drives tripped and a transformer shorted to ground on the primary. Several of the drives would not restart...
I have been having a problem with pushbutton operators sticking in a Cl 1, Div 1 inside location. Does anyone do maintenance on pushbuttons? What do you do? What material do you use to clean the operator shafts? I have asked the vendor for guidelines on this topic and have received no answer.
In Canada, we used to classify hazardous areas where the gas groups were designated A, B, C, D. Even though Gp A was generally felt to represent more dangerous gases than Gp D, it was a Code requirement that the Gp labelled on the equipment had to match the Gp in the area classification (i.e...
