什么是UL555认证

UL认证是什么？~

UL认证是美国保险商试验所（Underwriter Laboratories Inc.）作出的认证的简写。UL安全试验所是美国最有权威的，也是世界上从事安全试验和鉴定的较大的民间机构。 它是一个独立的、营利的、为公共安全做试验的专业机构。
它采用科学的测试方法来研究确定各种材料、装置、产品、设备、建筑等对生命、财产有无危害和危害的程度；确定、编写、发行相应的标准和有助于减少及防止造成生命财产受到损失的资料，同时开展实情调研业务。
UL 认证在美国属于非强制性认证，主要是产品安全性能方 面的检测和认证，其认证范围不包含产品的 EMC（电磁兼容）特性。
总之，它主要从事产品的安全认证和经营安全证明业务，其最终目的是为市场得到具有相当安全水准的商品，为人身健康和财产安全得到保证作出贡献。就产品安全认证作为消除国际贸易技术壁垒的有效手段而言，UL为促进国际贸易的发展也发挥着积极的作用。

扩展资料：
UL始建于1894年，初始阶段UL主在靠防火保险部门提供资金维持动作，直到1916年，UL才完全自立。经过近百年的发展，UL已成为具有世界知名度的认证机构，其自身具有一整套严密的组织管理体制、标准开发和产品认证程序。
UL由一个有安全专家、政府官员、消费者、教育界、公用事业、保险业及标准部门的代表组成的理事会管理，日常工作由总裁、副总裁处理。目前，UL在美国本土有五个实验室，总部设在芝加哥北部的Northbrook镇，同时在台湾, 苏州，广州和香港分别设立了相应的实验室。
参考资料：百度百科-UL认证

UL555是UL的标准号，是UL颁发的关于Fire Dampers的标准。其范围如下：

1 Scope

1.1 These requirements cover fire dampers that are intended for use where air ducts penetrate or terminate at openings in walls or partitions; in air transfer openings in partitions; and where air ducts extend through floors as specified in the Standard for Installation of Air-Conditioning and Ventilating Systems, NFPA 90A. Fire dampers are intended for installation in accordance with codes such as the BOCA National Mechanical Code, SBCCI Standard Mechanical Code, ICBO Uniform Mechanical Code, and the International Mechanical Code.

1.2 Fire dampers are evaluated for use as either:

a) Fire Dampers for Static Systems - For HVAC systems that are automatically shut down in the event of a fire or for air transfer openings in walls or partitions,

b) Fire Dampers for Dynamic Systems - For HVAC systems that are operational in the event of a fire, or

c) Combination Fire and Smoke Dampers - For locations in HVAC systems where a fire damper and a smoke damper are required at a single location.

1.3 Under these requirements a fire damper is subjected to a standard fire exposure, controlled to achieve specified temperatures throughout a specified time period, followed by the application of a specified standard hose stream. This exposure by itself is not representative of all fire conditions; conditions vary with changes in the amount, nature, and distribution of fire loading, ventilation, compartment size and configuration, and heat sink characteristics of the compartment. These requirements provide a relative measure of fire performance of fire damper assemblies under these specified fire exposure conditions. Any variation from the construction or conditions that are tested such as method of installation and materials has the potential to substantially change the performance characteristics of the fire damper assembly.

1.4 Fire dampers for static systems (no air flow through the damper) are intended to close automatically upon the detection of heat by a heat responsive device.

1.5 Under these requirements combination fire and smoke dampers and fire dampers for dynamic systems are exposed to standardized heat and airflow conditions and are evaluated for dynamic closure under these conditions.

1.6 Combination fire and smoke dampers shall also comply with the applicable requirements in the Standard for Smoke Dampers, UL 555S.

1.7 Fire dampers for dynamic systems are intended for use where the airflow is operational at the time of fire, such as in a smoke control system, or from other situations in which the fan system is operational at the time of a fire.

1.8 Where fire dampers are required in ducts that penetrate fire barriers and where the duct is also used as part of a smoke control system, the system designer shall ascertain which type of fire damper is appropriate for the application. Fire dampers for dynamic systems are evaluated only for dynamic closure under heated airflow conditions. Combination fire and smoke dampers that have an elevated temperature rating are evaluated for dynamic closure under heated airflow conditions and they are also evaluated to operate under heated air conditions.

1.9 Tests conducted in accordance with these requirements are intended to demonstrate the performance of fire dampers during the period of fire test exposure and are not intended to determine acceptability of fire dampers for use after exposure to fire.

1.10 It is the intent that tests conducted in accordance with the test methods described herein develop data to enable regulatory authorities to determine the acceptability of fire damper assemblies for use in locations where fire resistance of a specified duration is required.

1.11 Fire dampers are intended to close automatically upon the detection of heat by the use of a fusible link or other heat responsive device.

1.12 These requirements do not cover:

a) Performance of the fire damper assembly in walls, partitions, or floors constructed of materials other than those tested.

b) The performance of the fire damper assembly when installed using methods other than those fire tested.

c) Measurement of heat transmission through a fire damper assembly.

d) Measurement of the degree of control or limitation of the passage of smoke or products of combustion through the fire damper assembly.

至于哪些厂家有UL认证，访问UL官方网站数据库：http://database.ul.com/cgi-bin/XYV/template/LISEXT/1FRAME/index.htm，在Keyword中输入“Fire Dampers”即可查询。

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