Power plant fire detection system Power plant fire detection system MEP Designer (Mechanical) (OP) 6 Feb 17 07:11 is a fire detection system required for cable trenches for a 500 kV & 220 kV GIS substation in accordance with NFPA?? I appreciate Your cooperation.. RE: Power plant fire detection system 21121956 (Mechanical) 8 Feb 17 14:40 Hello everybody: Take a look to NFPA 850 (National Fire Protection Association). In this document has been incorporated the material of NFPA 851 dealing with Recommended Practice for Fire Protection for Hydroelectric Generating Plants. It is a good point to start your search on this subject. El que no puede andar, se sienta.