Most electrical outlets have a prong that connects to the earth ground, which is also usually wired into the building electrical system for safety.

绝大多数电源插座有一个地线端与大地相连，这通常是为保障建筑电气系统的安全而采取的安全措施。

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This paper mainly elaborates the design basis, the design principle and the design methods of a hotel building electrical system.

本论文主要阐述了某宾馆建筑电气系统设计的设计依据、设计原则和设计方法。

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This paper mainly elaborates the design basis, the design principle and the design methods of a hotel building electrical system.

本论文主要阐述了某宾馆建筑电气系统设计的设计依据、设计原则和设计方法。

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