69.1 A carbon monoxide alarm shall operate as intended after being connected in each polarity. While energized under either polarity, the alarm shall comply with the requirements of the Electric Shock Current Test, Section 70. This includes cord connected and fixed wiring (splice lead) types, battery types (main or standby) and multiple station interconnection leads. Each polarity is to be applied for at least 24 hours on all units unless a trouble signal or alarm (or pre-alarm) signal is obtained. For battery operated alarms intended to be connected by a polarized clip assembly, the reverse polarity is to be applied for a minimum of 1 second. A trouble or alarm (or pre-alarm) signal is to be not prohibited under any incorrect polarity applied. A maximum 1-second alarm is not prohibited when the correct polarity is connected.