Distribution lines primary voltages are which of the following?

Distribution lines primary voltages are which of the following?

• A. 34.5 kV & 13.8 kV
• B. 48 kV & 24 kV
• C. 12 kV & 4 kV
• D. 120 V & 240 V

Answer: (C)

Primary distribution lines carry medium voltage from substations to local transformers, operating in the kilovolt range to balance efficiency with safety. These voltages are high enough to minimize losses over distance but low enough to be manageable for local equipment. A common and practical range for these lines is 4 kV and 12 kV, which are routinely used to feed distribution transformers that then step down to 120/240 V for homes and businesses. The other options mix in service voltages (like 120/240 V) or voltages that are more typical of higher-tier transmission or subtransmission, not the standard primary distribution level. So the voltages 4 kV and 12 kV best describe distribution lines on the primary side.

Primary distribution lines carry medium voltage from substations to local transformers, operating in the kilovolt range to balance efficiency with safety. These voltages are high enough to minimize losses over distance but low enough to be manageable for local equipment. A common and practical range for these lines is 4 kV and 12 kV, which are routinely used to feed distribution transformers that then step down to 120/240 V for homes and businesses. The other options mix in service voltages (like 120/240 V) or voltages that are more typical of higher-tier transmission or subtransmission, not the standard primary distribution level. So the voltages 4 kV and 12 kV best describe distribution lines on the primary side.