How to ground a cabinet room?
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As shown in the diagram, only two LEBs are left for electrical use. Regarding instrument grounding, which one is correct between Figure 1 and Figure 2 above, or are neither correct?
Figure 1 shows the correct approach: the instrument ground should be connected independently to the LEB. This ensures the safe and effective grounding of the instruments, preventing interference or circuit issues that may arise from connection to the power supply ground. In Figure 2, the instruments and power supply share a common ground point, and this approach is not recommended. .
Refer to SH/T 3081 \"Code for Design of Instrument Grounding in Petrochemical Industries\"