shaun1
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As others have said you need to notify the DNO if this cable is before the service head/meter. The screw probably vapourised when it came in to contact with the live, clearimg the fault. But what you are now left with is damage to the insulation all the way through. This could lead to another, potentially larger arc flash, which could cause a fire or serious burns if you are in the vicinity. Get it sorted ASAP
