BV规范关于风油遥切的出处

ht736019516

BV审图对电气风油遥切要求：Either using "Normal open type" circuits provided with audible and visual alacase of circuit /power failure,
or using "Normally closed type" circuits, and it is to be provided with two electrically independent groups for the duplicated consumers,to avoid serious consequence by the mistake of wiring break.请问出自BV规范的哪里？