Měiguó mínyòng diànwǎng chángjiàn de shì fēnxiàng gōngdiàn.
Split-phase power supply is common in U.S. residential grids.
Tips
usage
Strictly an electrical-engineering term. The 相 (xiàng) here is the technical 'phase' (as in three-phase electricity 三相电 sānxiàng diàn), not the everyday meaning 'appearance'.