[Clauses (a), (b), (d)] To limit the probability that the performance of carbon monoxide alarming devices will fall significantly below expectations, which could lead to carbon monoxide gas entering living space undetected, which could lead to the acute poisoning or asphyxiation of persons.

[Clause (c)] To limit the probability that electrical connections and circuits for carbon monoxide alarming devices will be disconnected, which could lead to carbon monoxide alarming devices becoming non-operational, which could lead to carbon monoxide gas entering living space undetected, which could lead to the acute poisoning or asphyxiation of persons.