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Hi, We have an old actuator that is fed by 125 VDC. We received a new replacement for it but it is for 110VDC. Is it ok to use the same supply for the new one? I looked for the datasheet but it doesn't mention the voltage tolerance. Thanks

The interrupt rating is 400A. It's an MCC fed from a transformer and there is DC for the emergency stop switch.

Yeah we had no past issues with these MCCBs. It might be a malfunction on that specific phase.

Diagramhttps://files.engineering.com/getfile.aspx?folder=2bb3faf3-3267-4da9-aa96-a9cae605a9e9&file=?1.jpg

Hi, I need some help with investigating a burnt circuit breaker that feeds a compressor's motor. As you can see in the drawing attached, the voltage is 400V and a molded case circuit breaker that feeds the motor was burned at one phase only as an alarm was flagged of the motor overloading. As...

Hi, I have two questions regarding lightning protection arrestors and down conductors: 1. We have a gasoline loading bays and there is a grounding busbar for its instrumentation and lighting that's connected to the grounding grid. The canopies of these have lightning arrestors installed, and...

Hi, There was a brief power shudown that occured while switching from main power supply to backup generator for testing. An elevator in an old building was stuck with people trapped in it. An investigation is ongoing and I would like to know from electrical and technical pov what are the...

Dear che12345, We're following IEC.

I have a 400V, 10kVA UPS that will be fed from a 480V panel through 15kVA, 480/400V delta/wye transformer. I just want to confirm my calculations. I will take the power from 25A breaker with a 3C 10mm² power cable to the transformer. From the transfomer I will run 3C 10mm² + 4mm² ground to 25A...

Greetings, I just want to confirm the duration proposed by the contractor to shutdown a LV switchgear to install two new circuit breakers. Cable glanding 2 hours for each breaker Breakers installation 4 hours for each breaker Cable termination 3 hours for each breaker Torqueing and...

Thanks all. The substation is ours and inside our plant. The housing projects is nearby the plant since it's designated for our employees. And the reason for connecting from the same substation is the ease of access and logistics since it's ours.

Greetings, We have a substation that feeds a fuel loading plant and there is an on-going project to build houses near the plant and it was proposed to supply this project from the same substation. Is there any standard that prohibits a substation from feeding industrial and residential loads at...