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NON COMPLIANT NEW EV INSTALLATIONS

John Peckham
I was sent some information from the ECA concerning an audit undertaken by the Office of Low Emission Vehicles.


The sites inspected were those installed by "qualified" and "registered" installers claiming the OLEV subsidy.


0.8% were found to be dangerous (C1), 19.6% Potentially Dangerous (C2) and 25.6% requires improvement (C3). That makes 46% of new EV installations by qualified and registered persons to be non-compliant.


Am I the only person who thinks this is an utter disgrace?





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    John Peckham:


    With a loss of the supply neutral the vehicles bodywork will rise up  to a voltage possibly approaching 400V


     


    Just to reinforce this ... it's not as simple as considering that the Neutral downstream of the broken PEN conductor can only "float" up to the highest phase to earth voltage.


    If one phase is lightly loaded, and the other two phases have roughly equal loads, but opposing power factors, the voltage can rise above the phase to Earth voltage - the worst-case being nearly 1.4U, where U represents the actual supply voltage to Earth. Worth remembering that the worst-case value of U may not be 253 V for many LV transformers in the UK, but 264 V.


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  • 0
    John Peckham:


    With a loss of the supply neutral the vehicles bodywork will rise up  to a voltage possibly approaching 400V


     


    Just to reinforce this ... it's not as simple as considering that the Neutral downstream of the broken PEN conductor can only "float" up to the highest phase to earth voltage.


    If one phase is lightly loaded, and the other two phases have roughly equal loads, but opposing power factors, the voltage can rise above the phase to Earth voltage - the worst-case being nearly 1.4U, where U represents the actual supply voltage to Earth. Worth remembering that the worst-case value of U may not be 253 V for many LV transformers in the UK, but 264 V.


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