Does the SIS system require dual power supply?
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Where is the requirement for dual power supply in the SIS system?
HGT 20509-2014: Specification for Power Supply Design of Instruments – this is the relatively newer standard. Chapter 6: For important chemical processing units, measurement and control instruments should be powered by a dual-path UPS supply.
In addition, **fire protection and safety regulations also require that primary load systems must have dual power supply**
As required by GB50770-2013, the SIS system should be powered by a dual-channel uninterruptible power supply
It is advisable to use a dual-channel uninterruptible power supply; redundancy in power supply is preferred, with two separate power sources