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 36 subscribers
  • Views 1645 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

Earthing Rods for EV chargers

johnwicklover

Why is earthing rod needed in a TN-C-S System but not required in a TNS system?

Could you have a earthing rod in a TNS system ?

Any pointers would be appreciated.

Thanks.

J

Parents
  • 0

    They are to provide protection if there’s a PEN conductor fault in the distribution network.

    There are two variations, an earth rod with a very low resistance to hold down touch voltage on earthed metalwork, being the vehicle being charged and a reference rod to measure voltage to true earth.

    Providing correctly installed earth rods to hold down the touch voltage if there is a broken PEN conductor is not generally achievable, the means of protection that now being used is Open-PEN Protection using voltage measurement within the EVSE which is also preferred to voltage measurement using a reference earth rod.

    If an Open-PEN is detected all lives, neutral and earth are disconnected at the EVSE, so there isn’t a high touch voltage of the vehicle body.

Reply
  • 0

    They are to provide protection if there’s a PEN conductor fault in the distribution network.

    There are two variations, an earth rod with a very low resistance to hold down touch voltage on earthed metalwork, being the vehicle being charged and a reference rod to measure voltage to true earth.

    Providing correctly installed earth rods to hold down the touch voltage if there is a broken PEN conductor is not generally achievable, the means of protection that now being used is Open-PEN Protection using voltage measurement within the EVSE which is also preferred to voltage measurement using a reference earth rod.

    If an Open-PEN is detected all lives, neutral and earth are disconnected at the EVSE, so there isn’t a high touch voltage of the vehicle body.

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