The use of PE line in TN system and TT system is analyzed, and the characteristics of lighting return circuit in residence and the advantages of adding PE line are discussed.

对PE线在TN系统与TT系统中的作用进行了分析，讨论了住宅内照明回路的特点及增加PE线后的优点。

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The bottom line: PE should be seen in relation to the level and the direction of interest rates rather than in relation to its historical level.

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The orange line plots earnings, the dark blue line shows the historical normal PE ratio applied by the market, and the light blue shaded area reflect dividends paid out of earnings.

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