PE (always learning)
Senior Member
- Location
- Saint Louis
- Occupation
- Professional Engineer
Hey everyone,
I had a question about a project where I am being asked to provide short circuit current ratings for integrated power systems equipment. Basically what we have is a switchboard with four sections. We have a CT compartment section that feeds a 277/480V distribution section that feeds a transformer section that then feeds another section of the switchboard with 120/208V distribution. This is all a part of one switchboard called an integrated power systems switchboard by Siemens. The interrupting rating of the devices on the 277/480V side and the 120/208V are different. My question is what do I apply for the short circuit current rating of the switchboard? Do I treat the 277/480V side and the 120/208V side as separate switchboards and apply two separate SCCR ratings even though they are all technically a part of one integrated power system switchboard? Please let me know your thoughts.
Best Regards,
Engineer in training
I had a question about a project where I am being asked to provide short circuit current ratings for integrated power systems equipment. Basically what we have is a switchboard with four sections. We have a CT compartment section that feeds a 277/480V distribution section that feeds a transformer section that then feeds another section of the switchboard with 120/208V distribution. This is all a part of one switchboard called an integrated power systems switchboard by Siemens. The interrupting rating of the devices on the 277/480V side and the 120/208V are different. My question is what do I apply for the short circuit current rating of the switchboard? Do I treat the 277/480V side and the 120/208V side as separate switchboards and apply two separate SCCR ratings even though they are all technically a part of one integrated power system switchboard? Please let me know your thoughts.
Best Regards,
Engineer in training