Could any one explain the 0.75 multiplying factor in the following equation. According to the American Electricians' Handbook, when a three-wire system is tapped from a four-wire three-phase system the voltage drop is calculated as follow provided that the effect of inductance is neglected...
Can any mechanical engineer tell me what would be the effect (if any) of low starting voltage of an electric fire pump on the required water pressure? As you may know, the motor torque will drop in a squared amount as the voltage drops. Do you compensate for the drop in the initial water...
