Power-line communication (PLC) using an inhouse main-power line needs not to construct a additional new transmission lines. The main lines are for power transmission of a frequency of 50- or 60-Hz, not for high-frequency signal of a short-wave band. The main distribution line is fundamentally constructed from two-conductor line, so that its electromagnetic fields are generated in an open area, which is anxious for EMC problems in PLC. Generally, a theory for a transmission line is based on telegrapher's equations. In this article, in considering the EMC problems in the main distribution, the usage and application of a network, which has mode-voltage and -current terminals in the expression of impedance/admittance matrix has been proposed, is discussed. Moreover, some techniques based on the traditional transmission-line theory are discussed for some basic problems.%電力線通信（PLC）は短波帯の信号を，通信線路網を新しく構築しないで電力線配線網を使用する方式である．電力配線網自体は50あるいは60Hzの周波数の電力伝送用のものであり，短波帯の高周波信号を伝送することを目的としたものではない．電力配線網は2導体線路が基本線路系であり，本質的には電磁界が関空閣であるので，PLCではEMC問題が懸念されることは当然である．一般に伝送線路を用いる伝送回路網の理論は電信方程式である．小文では電力配線網におけるEMC問題を取扱う際にモード電圧・電流の端子で表現するモード行列の回路網表現法の使用法と伝送線路論的な手法を提示し，いくつかの基本的なモデルの取扱い法を述べている．
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