ex protector
Member
- Location
- Gemany, Bühl
Dear all, first of all I would like to say thank you to all members. I learn every time more and more.
But as always I have questions about the SCCR rating (UL508A) for panels.
The moment I have a cabinet which is supplied from external source (plug, cord connected) where the only information I have is 120V/60Hz/20A.
This line runs into a pressure controller which has two relay contacts to switch the power (L and N). After these two contacts the line is wired direct to an AC/DC converter from Siemens SITOP PSU100M. Output 24 VDC is wired direct to a selctivity module SITOP PSE200U.
All equipment inside is supplied with 24 VDC. So I only have the 120V circuit which ends at the PSU.
I don't understand how to give a SCCR rating for this cabinet. I cannot find any SCCR information labeled at the PSU.
My second question refers to a supply also via plugs because it is also a movable plant.
Here I have a main supply 3x480V/60/Hz, pre-fuse is 3x25A and a circuit 120V/60 Hz. max. fused 10A.
The 480V line supplies a PSU 480VAC/24VDC and via a manual motor controller eaton PKZM0 and a contactor to a motor agitator.
I believe the only way I need to check is the line to the motor, or?
But what's about the 120V line? This supplies an electronic pressure controller with two contacts and after the contacts a contactor to switch the 480V into the cabinet. Also a vessel light is supplied from the 120V line, fused with 2A. Do I need here also a SCCR rating? The pressure switch has no SCCR rating.
I hope you can help me with some helpful notes and information.
Thanks for your feedback and stay healthy.
Thomas
But as always I have questions about the SCCR rating (UL508A) for panels.
The moment I have a cabinet which is supplied from external source (plug, cord connected) where the only information I have is 120V/60Hz/20A.
This line runs into a pressure controller which has two relay contacts to switch the power (L and N). After these two contacts the line is wired direct to an AC/DC converter from Siemens SITOP PSU100M. Output 24 VDC is wired direct to a selctivity module SITOP PSE200U.
All equipment inside is supplied with 24 VDC. So I only have the 120V circuit which ends at the PSU.
I don't understand how to give a SCCR rating for this cabinet. I cannot find any SCCR information labeled at the PSU.
My second question refers to a supply also via plugs because it is also a movable plant.
Here I have a main supply 3x480V/60/Hz, pre-fuse is 3x25A and a circuit 120V/60 Hz. max. fused 10A.
The 480V line supplies a PSU 480VAC/24VDC and via a manual motor controller eaton PKZM0 and a contactor to a motor agitator.
I believe the only way I need to check is the line to the motor, or?
But what's about the 120V line? This supplies an electronic pressure controller with two contacts and after the contacts a contactor to switch the 480V into the cabinet. Also a vessel light is supplied from the 120V line, fused with 2A. Do I need here also a SCCR rating? The pressure switch has no SCCR rating.
I hope you can help me with some helpful notes and information.
Thanks for your feedback and stay healthy.
Thomas
