The National Electric Code, in Article 690.5, requires that any PV array installed on the roof of a dwelling must incorporate a ground-fault protection device to reduce fire hazards.

《美国国家电气法规》第690.5条规定，安装于住宅楼顶的任何光伏阵列都必须配备接地故障保护器件，以减少火灾隐患。

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Two imitating boards which installed on the bottom of two side of header can adjust to stubble height according to different ground condition.

割台两侧底部设置仿形板，可根据不同地面状况调整割茬。

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The underground pipeline is usually installed by top pipe method for the constructions on ground with concentrated railway and highway.

地面建构筑物．在铁路、公路密集条件下．顶管法铺设地下管道为最常见的施工方法。

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O. headquarters, in Geneva, and installed in an obscure office on the ground floor.

NEWYORKER: Snacks for a Fat Planet

The ground-based system offered by Gogo, which connects a Wi-Fi hot spot installed in a jet to one of 135 antennas Gogo has on the ground in North America, has been running on commercial aircraft since 2008.

WSJ: Picking Planes Wired for Wi-Fi

Larger flood protection doors are being installed, air vents are being moved to the roof, and electrical equipment is being repositioned on higher ground.

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