Hello i recently did an insulation resistance test on a ring main. the customer 'forgot to mention the alarm was connected on a fused spur!!! the alarm was last seen with a light flashing ( prob to indicate supply faliure ?) And as far as im aware(ACCORDING TO CUSTOMER) the main 3a fuse on spur is still intact. What damage might have been done and how do i go about rectifying it? Thx in advance .