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To calculate the volt drop for a particular cable we use {Tables 4.6, 4.7 and 4.9}. Each current rating table has an associated volt drop column or table. For Effect of Voltage Variation. ○ Definition of Terms. ○ Philippine Electrical Code Provisions. ○ Formula for Voltage Drop Calculation. ○ Sample Voltage drop calculations using the DC-resistance formula are not always accurate for reactance and AC resistance (see Example 2). AWG copper wire. Table 4 – Effective Z Calculations for Selected Wire Sizes at Various Power Table 5 – Error Voltage Drop Calculations for Real-World Examples in NextMultiply distance (length in feet of one wire) by the current (expressed in amps) by the figure shown in table for the kind of current and the size of wire Voltage Drop = in volts (V). I = Current in amperes. R= Conductive resistance in ohms/ 1000 ft. X= Conductor inductive reactance in ohms/1000 ft. Answer: First, calculate the total voltage drop allowed in the circuit. This is done by (480 volts x 3%) or 14.4 volts. Then use the three-phase formula for