In a simplified 240-volt single-phase feeder model, assume unity power factor and negligible reactance. Current is 48 amperes and the total outgoing-and-return conductor resistance is 0.30 ohm. What voltage drop results?

Texas Journeyman exam practice question · Feeder Calculations

In a simplified 240-volt single-phase feeder model, assume unity power factor and negligible reactance. Current is 48 amperes and the total outgoing-and-return conductor resistance is 0.30 ohm. What voltage drop results?

A4.8 volts
B72 volts
C800 volts
14.4 volts

Where to look it up

Explicit exercise assumptions; not a universal code requirement.

Why D is correct

For the stated resistive model, voltage drop is I × R = 48 × 0.30 = 14.4 volts. The supplied resistance already includes both conductors. This is 14.4 / 240 × 100 = 6 percent of the source voltage; no code-compliance limit is established by this calculation.

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In a simplified 240-volt single-phase feeder model, assume unity power factor and negligible reactance. Current is 48 amperes and the total outgoing-and-return conductor resistance is 0.30 ohm. What voltage drop results?

In a simplified 240-volt single-phase feeder model, assume unity power factor and negligible reactance. Current is 48 amperes and the total outgoing-and-return conductor resistance is 0.30 ohm. What voltage drop results?

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