Calculating Voltage Drop

To calculate the voltage drop in your system, you need to consider the following factors: Conductor length

625 ft per run x 3 runs = 1875 ft

Conductor type

Amor clad cables

Conductor size

350 mcm

Current draw

800 amps*

Voltage

480 voltsUsing these values, we can calculate the voltage drop using the following formula:

Voltage drop = (Current draw x Conductor length) / (Conductor area x Voltage x Power factor)

Power Factor

The power factor is not provided in your question, so we will assume a typical value of 0.9 (90%).

Conductor Area

The conductor area for 350 mcm amor clad cables is approximately 0.354 inches squared (in²).

Calculating Voltage Drop

Plugging in the values:

Voltage drop = (800 amps x 1875 ft) / (0.354 in² x 480 volts x 0.9)= 1.43 volts

Conclusion

The calculated voltage drop of 1.43 volts is within the acceptable range for most electrical systems. Therefore, your plan to use three, 350 mcm amor clad cables for a distance of 625 ft per run to feed an 800 amp, 480 volt, three-phase power panel should be adequate to account for voltage drop.

Note: Always consult with a qualified electrician to verify your calculations and ensure the safety and compliance of your electrical installation. Flag for review