Regarding different voltage levels and different current categories
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According to clause 12.0.15 of the General Code for Fire Protection Facilities, \"For circuits with different voltage levels and current categories within a system, they should be installed in separate conduit pipes or in different slots of the same conduit.\" Does anyone know what this means? In the case of bus systems used for combustible gas detection, should the 24VDC power bus and the signal bus be run in separate conduit pipes? For the branch lines, we’ve been using three-core cables until now; should we split them into two two-core cables each?
Here, the low-voltage and high-voltage circuits of the instruments should be laid separately to avoid interference. The low-voltage electricity for instruments usually refers to voltages below 36V. Your combustible gas system is originally 3-wire, with 24V voltage. There is no need to lay them separately. For example, in the case of an electromagnetic flowmeter, if the supply voltage is 220V and the signal cable operates at 24V, then they need to be laid separately.