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O-PEN Devices... will there be a standard?

Robert Waters

Hi ,

I am looking to find out if there is a standard being worked on for O-PEN devices that provide safety protection for single phase EVSE connected to a TN-C-S system?

I am fully aware of the information on this subject within the amendment to 7671 and the IET code of practice for EVSE installations, but wondered if a specific BS document was being drafted up. and if so, what the possible launch date was and how I could get hold of any provisional documents.

Regards

Rob

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    Good question. For those that opt for an open pen method, 722.411.4.1 indent iv allows for a device that relies on the voltage between P and N to be monitored such that when it deviates from the 207-253v range the contactor pulls out. The method is only applicable to single phase. A well respected source has discredited its safety and even the indent has a note of caution. Irrespective of what the manufacturers of charge points who employ this method might have in their instructions, it is not inconceivable that such equipment could be used for a single-phase application in a TPN installation where the protection could be compromised. 
    One manufacturer I am aware of uses this method but also has a CT on the protective conductor to the car that pulls the contactor out when around 18mA is flowing.

    For me, the only viable option for the installation of EV charge points on TNCS systems is indent (iv) which the current COP seems to have ignored but I think I understand the reasons.

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  • 0

    Good question. For those that opt for an open pen method, 722.411.4.1 indent iv allows for a device that relies on the voltage between P and N to be monitored such that when it deviates from the 207-253v range the contactor pulls out. The method is only applicable to single phase. A well respected source has discredited its safety and even the indent has a note of caution. Irrespective of what the manufacturers of charge points who employ this method might have in their instructions, it is not inconceivable that such equipment could be used for a single-phase application in a TPN installation where the protection could be compromised. 
    One manufacturer I am aware of uses this method but also has a CT on the protective conductor to the car that pulls the contactor out when around 18mA is flowing.

    For me, the only viable option for the installation of EV charge points on TNCS systems is indent (iv) which the current COP seems to have ignored but I think I understand the reasons.

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