本文档将对与谐波电流相关的问题进行概述，并特别关注于信息技术设备。同时对国际规章中解决这些问题的方式进行介绍。

An Emergency Power Off (EPO) system is a control mechanism, formally known as a "disconnecting means." It is intended to power down a single piece of electronic equipment or an entire installation from a single point. EPO is employed in many applications such as industrial processes and information technology (IT). This white paper describes the advantages and disadvantages of EPO for protecting data centers and small IT equipment rooms containing uninterruptible power supply (UPS) systems. Various codes and standards that require EPO are discussed. Recommended practices are suggested for the use of EPO with UPS systems.

Radio frequency identification (RFID) technology helps automate a variety of business processes, improving their efficiencies. It generates a huge volume of data that needs to be filtered, processed and stored, and generally requires its own virtual local area network (VLAN). To gain all the promised benefits and return on investment of RFID, the network must be highly available. The data center physical infrastructure (DCPI) must be assessed for vulnerabilities in power, cooling, physical security, and other CCPI elements. Failing to plan for DCPI can lead to disruption of critical business processes resulting in loss of revenue and competitive advantage. This paper provides an understanding of an RFID network and its components, identifies critical DCPI locations, and explains how to plan for high availability.

Many power-related problems are the result of Inter-System Ground Noise. This problem cannot be corrected using typical AC-only power protection equipment. The cause and solution of Inter-System Ground Noise problems are described.

当今的技术室需要恒温恒湿的环境，以便敏感的电子设备可以达到最佳运行效果。标准的舒适型空调不适合技术室，会造成系统关闭和组件故障。因为精密空调可以使温度和湿度的变化维持在一个整定值的范围之内，所以可以提供敏感电子设备所需的恒温恒湿的环境，从而使您的公司避免发生高代价的停机时间。

市场上目前充斥着各种不同类型的 UPS 系统，其特性也各不相同。本文对于每种 UPS 类型给出了定义，探讨了每种系统的实际应用，并列出了各种系统的优缺点。借助于这些信息，您可以做出明智的决策，选择适合自己需要的 UPS 拓扑结构。

以太网供电（PoE）技术首创通过部署可同步支持供电和数据访问的单条以太网线缆实现削减成本的目的。然而，如果用来支持PoE技术部署的电源和制冷规划不善，则可能导致意外的停机故障。本文将介绍在保障PoE技术投资时需谨慎考虑的电源和制冷方案注意事项。

数据中心和网络机房对于物理和供电基础设施的设计规模通常比实际这需要大出一倍。本文介绍了与过度规划相关的统计数据。并对与过度规划有关的成本进行了量化。进而讨论了导致过度规划设计的基本原因，并介绍了避免过度规划设计的一种新的架构和方法。

Contrary to popular belief, the recycling of lead-acid batteries, which are the most common batteries found in data centers, is one of the most successful recycling systems that the world has ever seen. Reputable battery manufacturers, suppliers, and recycling companies have teamed up to establish a mature and highly efficient lead-acid battery recycling process. This paper reviews battery end-of-life options and describes how a reputable vendor can greatly facilitate the safe disposal and recycling of VRLA lead-acid batteries.

本说明将有助于解释瓦特（W）与伏安（VA）之间的差异，并介绍这两个术语在电力保护设备的指定中是如何被正确和错误使用的。