Hello,
I have designed multiple PCBs and I believe I am fairly knowledgeable in low power DC circuits. I am currently working on a project in which it will control multiple high power LED panels. The total current will be ~60A at 12V. I will use bus-bars on the PCB and it will be thick copper, so it should be fine in that regard.
My issue in understanding is when it comes to the proper usage of chassis ground and how it relates to the safety of a high power DC system. This PCB will be mounted into a sheet metal enclosure. This enclosure will be in close contact (touching) with people constantly, so safety is paramount. Within this same metal enclosure, there will be a metal enclosed DC power supply, which will supply my power for the board. Similar to this, but higher power rated of course.
So, I see a few options:
This is my reasoning for this:
If not, which should I do, and why?
If they are both isolated from the enclosure completely, that also seems like a safe route, but I feel that if number 3 is also safe, it ensures that the worst case scenario is handled safely.
Thank you so much,
Kyle
I have designed multiple PCBs and I believe I am fairly knowledgeable in low power DC circuits. I am currently working on a project in which it will control multiple high power LED panels. The total current will be ~60A at 12V. I will use bus-bars on the PCB and it will be thick copper, so it should be fine in that regard.
My issue in understanding is when it comes to the proper usage of chassis ground and how it relates to the safety of a high power DC system. This PCB will be mounted into a sheet metal enclosure. This enclosure will be in close contact (touching) with people constantly, so safety is paramount. Within this same metal enclosure, there will be a metal enclosed DC power supply, which will supply my power for the board. Similar to this, but higher power rated of course.
So, I see a few options:
- Isolating the power supply and the PCB from the enclosure with plastic or another insulator
- Grounding the power supply or the PCB to the enclosure.
- Grounding both the power supply and the PCB to the enclosure.
This is my reasoning for this:
- If there is a loose wire from the power supply, it will short with the enclosure of itself, which shorts to the main enclosure, ensuring a breaker/fuse blows.
- Same as 1, but with the PCB.
If not, which should I do, and why?
If they are both isolated from the enclosure completely, that also seems like a safe route, but I feel that if number 3 is also safe, it ensures that the worst case scenario is handled safely.
Thank you so much,
Kyle