Hoping there might be a SCCR guru that could guide me to an answer:
I’m doing some retrofit projects where the panels have to be updated for SCCR since they left the facility. What I have are Telemecanique contactors and overloads with FRS-R fuses in front of them.
I went to the UL website (https://www.ul.com/resources/short-circuit-current-ratings-combination-motor-controller-components) and pulled the spreadsheet for Square-D IEC fuse (SquareD IEC Fuse_04-08-08.xls) and did in fact find my contactors and overloads in all of the panels.
However, they are all listed in combination with a Square-D fuse block for Class J and CC fuses. (GS1GU3 for Class J fuses, GS1DDU3 for CC)
The original panels have a Bussman R600 fuseblock (200kA SCCR) with FRS-R fuses.
So, if I were designing this panel from scratch, I would use those parts recommended. However, the FRS-R fuses have a better rating, are already wired and in the panel. Do I have to swap them out for the Square-D component / fuses in order to achieve the 100kA rating? Is there any leniency on the fuse block that is used?
I’m doing some retrofit projects where the panels have to be updated for SCCR since they left the facility. What I have are Telemecanique contactors and overloads with FRS-R fuses in front of them.
I went to the UL website (https://www.ul.com/resources/short-circuit-current-ratings-combination-motor-controller-components) and pulled the spreadsheet for Square-D IEC fuse (SquareD IEC Fuse_04-08-08.xls) and did in fact find my contactors and overloads in all of the panels.
However, they are all listed in combination with a Square-D fuse block for Class J and CC fuses. (GS1GU3 for Class J fuses, GS1DDU3 for CC)
The original panels have a Bussman R600 fuseblock (200kA SCCR) with FRS-R fuses.
So, if I were designing this panel from scratch, I would use those parts recommended. However, the FRS-R fuses have a better rating, are already wired and in the panel. Do I have to swap them out for the Square-D component / fuses in order to achieve the 100kA rating? Is there any leniency on the fuse block that is used?