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Disconnection time extended to 63 amp circuits

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Does anyone know why the 0.8 and 0.4 second disconnection time requirements are now extended from 32 amp circuits to 63 amp receptacle circuits? Is this because the supply sources are getting stronger?

[ElectriciansForums.net] Disconnection time extended to 63 amp circuits
 
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A total guess, but I'm wondering if this is anything to do with covering future EV charging points?
(Note to self I must get Amendment 1....)
 
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