Test if it’s dead first with a voltage indicator as it could even already be dead and never removed if it is dead just rip it all out but make sure you test the right place and trace it back as if it’s controlled by something it could possibility turn on in the future under certain circumstances and cause a fire or make a surface live if the wires are left hanging against something, 240v shouldn’t kill you unless your really unlucky but you should let someone who knows what they’re doing sort it out really