Under the nfpa 496 type z pressurization umbrella what are your thoughts on this design / theory. Use nitrogen to perform the initial enclosure purge and pressurization, this allows a pressure switch to close which in turn closes a contactor that makes the electronics energized. This enables an enclosure mounted fan to turn on and a damper to open, then the fan takes over the pressurization of the enclosure and enables the nitrogen to be turned off (the fan is pulling air through ductwork from a non-classified area -I know it's not ideal to have negative pressure in the ductwork but lets say it is sealed and a combustable gas sensor is also monitoring the ducted air).
The reasoning for this design is to avoid having c1.d2 rated pressurization fan and explosion proof (NEMA 7) boxes for contactors and batteries while also limiting the amount of nitrogen consumption (only used during system start-up). Thanks in advance for your comments.
Regards,
Jason
The reasoning for this design is to avoid having c1.d2 rated pressurization fan and explosion proof (NEMA 7) boxes for contactors and batteries while also limiting the amount of nitrogen consumption (only used during system start-up). Thanks in advance for your comments.
Regards,
Jason