Thanks for the comment @EskEnergy - it’s nice to talk about those things with other people who are interested in electric vehicles!
I was asking about removal of GFI because I remember seeing somewhere a note to not to disconnect it. I was wondering if it plays a part in functionality of the equpment - e.g. check to allow charging to start.
Regarding other comments, there are few common misconceptions for domestic installatons I think I should address.
- “Open PEN detection device is required for all EVSE whether indoors or outdoors.”
Those devices are not a requirement in BS 7671:2018 (+A1 2020) at all. In fact 722.411.4.1. says that PME supply should not be usd for EVSE outdoors unless one of five conditions is met, where this Open PEN detection device is just one of the options.
If the vehcle is charged outdoors there are other options, for example, installing additional earth electrodes, converting existing installation to TT, TT system for EVSE only or isolation transformer.
Open PEN detecion device is never needed if the EV is charged inside and there is no posibility to use it while EV is outside. CoP 6.7.1. repeats that PME can be used within a building without rods (or open PEN devices for that matter), but gives aditional suggestion that non-extended tethered lead only should be used (key - you should not be able to be in contact with true earth and PME earthing).
- “Type B RCD is needed for DC fault protection”
722.531.3 specifies what type of RCD is needed for EVSE. That is:
*Type B RCD or
*Type A or Type F in conjunction with RDC-DD.
From my experience if Type B RCD is not installed, Type A RCD is used together with a residual direct current detecton device (RDC-DD) that can detect if the DC component exceeding 6mA and disconnect the supply. Those devices might be built-in in EVSE or can be installed seperatly.
- Regrding Discrimination.
In 18th edition it is called Co-ordination or selectivity. Yes, if you install RCD in your EVSE distribution board you might have issues with coordinaton with RCD/GFI. CoP recognizes that sometimes it might not be practicable to folow it. This is the reason why I was asking if GFI is required for functionality of the OpenEVSE.