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大多数现行的国家建筑供电用线标准，都是基于安全防火来考虑的。除少数外，这些标准均未能足够地重视电能效率和线路的充分接地，尤其是被称为“电源质量”的现代电工学问题。介绍了电源质量问题的由来和当前解决的方法。通过使用较多或更大的导体来解决电源质量，这对于铜的消费具有积极的意义。特别应强调的是，谐波电流常常产生在常用的“固态”电子设备的开关模式电源中，它能使线路的薄弱部位击穿，并且使变压器产生危险的过热现象。
Most of the current national line standards for building power supply are based on safety fire protection. With the exception of a few, these standards do not adequately focus on power efficiency and adequate grounding of circuits, especially the modern electrotechnical problems known as “power quality.” The origin of power quality problems and the current solutions are introduced. The use of more or larger conductors to solve the power quality has positive implications for the consumption of copper. In particular, it should be emphasized that harmonic currents are often generated in the switch-mode power supplies of commonly used “solid-state” electronic devices. They can break down the weak parts of the circuit and cause dangerous overheating of the transformer.