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 5 replies
  • Subscribers 38 subscribers
  • Views 1186 views
  • Users 0 members are here
Options
You may also be interested in
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

EV Chargers with built in RCD and 537.2.2

Ian Cheek

I read 537.2.2, and wonder if this applies to our EV charge points which offer built in 30ma and 6ma DC RCD's. Im sure these RCD must be electronic in nature. 

Upstream is a traditional MCB, so the EV Charger could be isolated.

However looking at 411.3.2.1 it has the line "the protecticve device shall be suitable for isolation of at least the line conductor"

So as 411.3.2.1 uses the term isolation, and the RCD is a protective device, should the inbuilt RCD comply with 537.2.2?

I'll stop reading the regs and have a cup of T, Thank you for looking, and in advance of your advice.

Parents
  • 0

    More my questions is of the electronics. Electronic isolation can not be used, based on my experience with electronic isolation, in its off state, it is only off if it tries to pull current, you can often still measure the input voltage at the output when it is switch (driven) off.

    It could well be that the switching mechanism is still mechanical even if the detection system is electronic (not unlike most RCBOs these days). Most EV charge points have an in-built contactor (to switch the charging current and ensure the connectors are dead when not connected to a vehicle) - so the RCD element could well operate though that.

       - Andy.

Reply
  • 0

    More my questions is of the electronics. Electronic isolation can not be used, based on my experience with electronic isolation, in its off state, it is only off if it tries to pull current, you can often still measure the input voltage at the output when it is switch (driven) off.

    It could well be that the switching mechanism is still mechanical even if the detection system is electronic (not unlike most RCBOs these days). Most EV charge points have an in-built contactor (to switch the charging current and ensure the connectors are dead when not connected to a vehicle) - so the RCD element could well operate though that.

       - Andy.

Children
No Data

Community Rules & Guidelines