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通过开关关闭。BS 5839-6 states that: For mains powered alarms, each with an integral standby supply (Grade D)1, the mains electricity supply should take the form of either a) an independent circuit at the dwelling's main circuit board, in which case no other electrical equipment should be connected to this circuit (other than a dedicated monitoring device installed to indicate failure of the mains electricity supply to the alarms);或b）单独使用的电力，定期使用的局部照明电路。
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