NFPA 20 and fire water pumps

[wd1980]

Floks,
Our plant is designed with electrical and back up diesel pump.
According to NFPA 20 should we Connect the electrical one to UPS in addition to a national grid (reliable source) or only to the latest one (no need to UPS connection)

Regards

 

[mk3223]

IMO, to have the diesel pump as the back-up, the electrical pump is okay with the regular power without UPS. And, it's still a good practice to have a double bus per supply circuit for the Fire water pump.
And, the Local AHJ has the final approval of your the fire water pump system.