What effect does higher pressure have on wire size?

What effect does higher pressure have on wire size?

• A. decreases amps needed
• B. increases amps needed
• C. increases voltage needed
• D. no effect

Answer: (B)

The main idea is that wire size is driven by how much current the circuit must carry. When a pump has to work against higher pressure, it must deliver the same water against a greater head, so it tends to draw more electrical current. More amps means the conductor must be larger to carry that load safely without overheating, so you’d size the wire bigger. Voltage isn’t the driver for sizing in this case, and the idea that there’s no effect isn’t correct, since increased load from higher pressure increases current draw.

The main idea is that wire size is driven by how much current the circuit must carry. When a pump has to work against higher pressure, it must deliver the same water against a greater head, so it tends to draw more electrical current. More amps means the conductor must be larger to carry that load safely without overheating, so you’d size the wire bigger. Voltage isn’t the driver for sizing in this case, and the idea that there’s no effect isn’t correct, since increased load from higher pressure increases current draw.