For a 19.8-amp, 3Ø, 208-volt load 152 feet from the panel, what is the smallest circuit conductor you can use to limit voltage drop to 1.8%?

For a 19.8-amp, 3Ø, 208-volt load 152 feet from the panel, what is the smallest circuit conductor you can use to limit voltage drop to 1.8%?

• A. 10 AWG
• B. 6 AWG
• C. 12 AWG
• D. 8 AWG

Answer: (D)

To determine the smallest circuit conductor that can be used to limit the voltage drop to 1.8% for a load of 19.8 amps at 208 volts over a distance of 152 feet, it is essential to calculate the allowable voltage drop. 1. **Calculate the Maximum Allowable Voltage Drop**: The percentage voltage drop is calculated based on the total voltage: \[ \text{Maximum Voltage Drop} = 208 \text{ volts} \times 0.018 = 3.744 \text{ volts} \] 2. **Calculate the Voltage Drop per Conductor**: Since the load is 3-phase, we need to account for the circuit configuration when calculating the voltage drop. The formula for voltage drop in three-phase systems is: \[ V_d = \frac{1.732 \times I \times L \times R}{1000} \] Where \( V_d \) is the voltage drop in volts, \( I \) is the current in amps, \( L \) is the one-way length in feet, and \( R \) is the resistance of the conductor in ohms per thousand feet. 3.

To determine the smallest circuit conductor that can be used to limit the voltage drop to 1.8% for a load of 19.8 amps at 208 volts over a distance of 152 feet, it is essential to calculate the allowable voltage drop.

1. Calculate the Maximum Allowable Voltage Drop:

The percentage voltage drop is calculated based on the total voltage:

[

\text{Maximum Voltage Drop} = 208 \text{ volts} \times 0.018 = 3.744 \text{ volts}

]

2. Calculate the Voltage Drop per Conductor:

Since the load is 3-phase, we need to account for the circuit configuration when calculating the voltage drop. The formula for voltage drop in three-phase systems is:

[

V_d = \frac{1.732 \times I \times L \times R}{1000}

]

Where ( V_d ) is the voltage drop in volts, ( I ) is the current in amps, ( L ) is the one-way length in feet, and ( R ) is the resistance of the conductor in ohms per thousand feet.