Electrical Design for Fire Fighting Pumps
Electrical Design for Fire Fighting Pumps
Oct 11, 2018
electrical-knowhow.com
Fire Pumping Calculations: Every Pump Operator’s Basic Equation⁠ -------------------------------------------------------------------------⁠ The equation EP = NP FL APP ELEV is the basic equation every pump operator needs to calculate when operating the fire pump. ⁠ ⁠ Today, many pump panels have flow meters that allow the pump operator to match the readout on the pump panel with the gallon-per-minute (gpm) flow of the selected nozzle. ⁠ ⁠ This is a disservice to the integrity of the pump operato
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Fire Pumping Calculations: Every Pump Operator’s Basic Equation⁠ …
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Fire Pump Circuit Sizing is Mind-Blowing! Short-Circuit/Ground-Fault Protection Size - Protection must have an ampere rating not less than the nameplate locked-rotor current of the fire pump motor (between 6 to 8 times motor FLC) [NEC695.4(B)(2)(1)]. Conductor Sizing - Conductors must have an ampacity of not less than 125 percent of the motor full-load current rating in accordance with 430.22 [NEC 695.6(B)(2)]. In this example, a 34A FLA/183A LRC fire pump motor requires 200A protection [240.6(A
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