Proper grounding of SDR receivers
Hello! A portable smoke exhaust must be connected. According to clause 8.1. SP 60.13330.2016, it belongs to SDR electrical receivers, and the requirements of the codes of fire safety rules apply to it.
In this case, the connection should be made to the control panel, but clause 4.13. SP 6.13130.2013 prohibits us from using residual current circuit breakers and circuit breakers controlled by differential current.
Thus, the use of TT and TN systems for protective grounding of the specified power receiver is not possible. Tell me a way to fulfill the requirements of protective grounding without violating the requirements of the fire safety codes.
Why is it impossible to organize on the TN system? If at TT, I understand that the installation of RCDs and switches controlled by differential current is mandatory according to the PUE, then with TN it is not clear. After all, there is no need to install them.
Therefore, I believe that in your case there should be TN and power through the circuit breaker. In this case we omit differential protection.
I am more interested in how you comply with Section 4.3. from SP 6.13130.2013
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