BS 7273-4提供了设计、安装、调试和维护建议 用于启动车门释放机构的电子装置，该释放机构保持打开、自动关闭 防火门；打开电子门锁；或使电动滑动门打开。这个 业务守则于2007年首次发布，并于2015年修订。购买本文件时可获得的所有当前修订均包含在购买本文件中。

BS 7273-4 provides recommendations for the design, installation, commissioning and maintenance of electronic arrangements for the actuation of door release mechanisms that release held-open, selfclosing fire doors; unlock electronically locked doors; or cause powered sliding doors to open. The code of practice was first published in 2007 and was revised in 2015.All current amendments available at time of purchase are included with the purchase of this document.