目的和范围:1.1本工程实践旨在作为指定农场防雷系统的指南，并根据公认的设计、材料和安装标准检查现有、新的或拟议的防雷系统。1.2本工程实践适用于保护农舍、谷仓、棚屋、筒仓、板条地板、， 栅栏、树木、谷仓设备和其他相当大的导电体或电感体。包括高达23米（75英尺）的普通结构。1.3典型建筑物上的常见组件详细说明了正常条件下的当前做法。 这些例子不能涵盖农场上存在的广泛结构变化。建议业主或其代理人在本协议未涵盖的情况下，向在防雷原理、理论和安装要求方面经验丰富的工程师，或向公认的、推荐的防雷材料和设备制造商或经销商，寻求工程咨询。1.4在本工程实践未涵盖的区域，请参考美国国家消防协会第。 78，防雷规范；保险商实验室标准，主标签防雷要求；或防雷协会标准LPI-175，安装规范。

Purpose and Scope:1.1This Engineering Practice is intended as a guide for specifying farm lightning protection systems, and to check existing, new or proposed lightning protection systems against accepted standards of design, materials, and installation.1.2This Engineering Practice is applicable to protection of farm homes, barns, sheds, silos, slatted floors, fences, trees, barn equipment and other sizable bodies of conductance or inductance. Included are ordinary structures up to 23 m (75 ft) high.1.3Common assemblies on typical buildings are detailed to show current practices under normal conditions. Examples cannot cover the wide range of structural variations existing on farms. It is recommended that when a condition is not covered herein, the owner or his agent obtain engineering consultation by an engineer experienced in lightning protection principles, theories, and installation requirements, or from an established and recommended manufacturer or distributor of lightning protection materials and equipment.1.4In areas not covered by this Engineering Practice, refer to the National Fire Protection Association Standard No. 78, Lightning Protection Code; Underwriters' Laboratories Standard, Requirements for Master Label Lightning Protection; or Lightning Protection Institute Standard LPI-175, Installation Code.