Fire Pump takes the pump motor, locked-rotor current, jockey pump, supply and run length, and gives back the Article 695 overcurrent device, conductors and voltage drop check, with a drawing.
The drawing the Suite wrote for a 50 hp, 460 V fire pump tapped ahead of the main: the circuit from the utility to the motor, each part numbered and answered beside it.
The report the Suite wrote for this example: the inputs and the worked-out answers, then the drawing on its own page.
Pages 1 and 2 list the inputs, then the supply, disconnect, overcurrent device, conductors and voltage drop with their sections; page 3 is the drawing with what is not in the circuit, the checks and what people get wrong.
The phone app's example job, Example - 50 hp fire pump, opened with Open phone job… and worked out by the Suite.
STEP 1 OF 6The example in, before it is worked out: 50 hp, 460 V pump, 363 A locked-rotor, 2 hp jockey, tapped ahead of the service disconnect, 200 ft of copper in PVC.
STEP 2 OF 6Worked out: overcurrent device 400 A (363 A + 3.4 A = 366.4 A), conductors 3 AWG Cu (85.5 A), voltage drop within 695.7.
STEP 3 OF 6How it was worked out: supply, disconnect, overcurrent device and conductors, each with its section, then the voltage drop.
STEP 4 OF 6Voltage drop (448 V starting, 473 V running), what is not in this circuit, the controller, then the drawing begins.
STEP 5 OF 6The drawing: tap ahead of the main, the 400 A fire pump device, the listed controller and the motor, each answer numbered beside it.
STEP 6 OF 6What is deliberately not in this circuit, the checks (448 V and 473 V both pass) and what people get wrong.
