Question: when did the nec first introduce afci protection to the code
[{'answer': '2014', 'provenance': [{'wikipedia_id': '897047', 'title': 'Arc-fault circuit interrupter', 'start_paragraph_id': 2, 'start_character': 290, 'end_paragraph_id': 2, 'end_character': 294, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '897047', 'title': 'Arc-fault circuit interrupter', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 543, 'bleu_score': 0.977139080690077, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13016087654607924790}, 'section': 'Section::::Abstract.'}]}]