Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 8 replies
  • Subscribers 32 subscribers
  • Views 2007 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

24VDC Power Supplies & Leakage Current

Les Spiteri
Hi, looking for some thoughts.


I recently had a customer asking for an RCBO upstream of a 24VDC power supply (i.e. on the 240Vac incoming) and I thought "never seen that before".
  • What possible reason is there for doing this?

  • Would this be considered "safer" than using an MCB?

  • What would happen without RCBO one if there was leakage inside the 24Vdc power supply?

  • Only time I have previously used RCBOs was where you provide a socket in enclosures as per all guidelines now.


Thanks Folks

Parents
  • 0
    Les Spiteri:

    It would be a switch mode power supply and SELV,  I usually earth the 0V of the output of the power supply. I had been taught to do this many years ago as it means that any single fault condition short to 0V trips the circuit. Off topic slightly but that still means its SELV correct?


    The S in S E L V stands for seperated. If any of the output is connected to any of the input (by connecting the outgoing 0v line to mains earth for example) then it is not SELV


Reply
  • 0
    Les Spiteri:

    It would be a switch mode power supply and SELV,  I usually earth the 0V of the output of the power supply. I had been taught to do this many years ago as it means that any single fault condition short to 0V trips the circuit. Off topic slightly but that still means its SELV correct?


    The S in S E L V stands for seperated. If any of the output is connected to any of the input (by connecting the outgoing 0v line to mains earth for example) then it is not SELV


Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines