question: When was a 11kV system of NY , New Haven and Hartford was converted to 12.5 kV ?
answer: 1987
turker_answer: In 1987 the 11kV system of NY , New Haven and Hartford was converted to 12.5 kV .
rule-based: Was a 11kV system of NY , New Haven and Hartford was converted to 12.5 kV in 1987 .