1.1 這是火災(zāi)測試響應(yīng)標準。 1.2 幾種火災(zāi)試驗響應(yīng)特性，包括持續(xù)燃燒的時間、熱釋放速率、釋放的總熱量、有效燃燒熱和比熄滅面積；在恒定輻射熱通量下通過本試驗方法測量或計算。有關(guān)具體限制，請參見 5.7 和截面 6. . 1.3 當電纜試樣（不包括附件）經(jīng)受輻射熱時，通過燃燒電纜或光纜中包含的電氣絕緣材料進行試驗。 1.4 以國際單位制表示的數(shù)值應(yīng)視為標準。 括號中給出的值僅供參考。 1.5 本標準并非旨在解決與其使用相關(guān)的所有安全問題（如有）。本標準的用戶有責任在使用前制定適當?shù)陌踩?、健康和環(huán)境實踐，并確定監(jiān)管限制的適用性。 有關(guān)具體的預防說明，請參閱第節(jié) 7. . 1.6 本標準測量并描述了材料、產(chǎn)品或組件在受控條件下對熱量和火焰的響應(yīng)，但其本身并不包括在實際火災(zāi)條件下對材料、產(chǎn)品或組件進行火災(zāi)危險或火災(zāi)風險評估所需的所有因素。 1.7 防火測試本身就很危險。在進行這些測試時，應(yīng)采取適當?shù)娜藛T和財產(chǎn)保護措施。 1.8 本國際標準是根據(jù)世界貿(mào)易組織技術(shù)性貿(mào)易壁壘（TBT）委員會發(fā)布的《關(guān)于制定國際標準、指南和建議的原則的決定》中確立的國際公認標準化原則制定的。 ====意義和用途====== 5.1 本試驗方法用于確定由于將電纜或光纜中包含的絕緣材料暴露于錐形量熱器裝置中規(guī)定的初始試驗熱流中而導致的熱釋放速率和許多其他火災(zāi)試驗響應(yīng)特性。 5.2 定量熱釋放測量為電纜或光纜的設(shè)計和產(chǎn)品開發(fā)提供了潛在有用的信息。 5.3 熱釋放測量通過定量測量組件和復合材料修改引起的防火性能的具體變化，為產(chǎn)品開發(fā)提供了有用的信息。如果產(chǎn)品在相關(guān)火災(zāi)暴露條件下不會在其表面?zhèn)鞑セ鹧?，則本試驗方法中的熱釋放數(shù)據(jù)將無法預測產(chǎn)品行為。 5.4 通過本試驗方法確定的耐火試驗響應(yīng)特性受用作試樣的材料厚度的影響，無論是作為斑塊還是作為電線或電纜上的涂層。 使用的導線或電纜的直徑也會影響測試結(jié)果。 5.5 輻射暴露用作本試驗方法的能源。這種類型的光源已用于比較在垂直電纜槽配置中燃燒時電纜內(nèi)絕緣材料的熱釋放速率和火焰?zhèn)鞑パ芯浚ㄔ囼灧椒?D5424 和 D5537 ) ( 2- 9 ). 尚未建立明確的關(guān)系。 5.6 與傳播電纜火災(zāi)和非傳播火災(zāi)之間的臨界極限相對應(yīng)的熱釋放率值未知。 5.7 本試驗方法不確定凈燃燒熱。 5.8 尚未證明該試驗方法能夠預測電纜或光纜在全尺寸火災(zāi)中的響應(yīng)。特別是，本試驗方法未涉及電纜在全尺寸火災(zāi)中的自熄特性。

1.1 This is a fire-test-response standard. 1.2 Several fire-test-response characteristics, including the time to sustained flaming, heat release rate, total heat released, effective heat of combustion, and specific extinction area; are measured or calculated by this test method at a constant radiant heat flux. For specific limitations see also 5.7 and Section 6 . 1.3 The tests are conducted by burning the electrical insulating materials contained in electrical or optical fiber cables when the cable test specimens, excluding accessories, are subjected to radiant heat. 1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific precautionary statements, see Section 7 . 1.6 This standard measures and describes the response of materials, products, or assemblies to heat and flame under controlled conditions, but does not by itself incorporate all factors required for fire hazard or fire risk assessment of the materials, products or assemblies under actual fire conditions. 1.7 Fire testing is inherently hazardous. Adequate safeguards for personnel and property shall be employed in conducting these tests. 1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This test method is used to determine the heat release rate and a number of other fire-test-response characteristics as a result of exposing insulating materials contained in electrical or optical cables to a prescribed initial test heat flux in the cone calorimeter apparatus. 5.2 Quantitative heat release measurements provide information that is potentially useful for design of electrical or optical cables, and product development. 5.3 Heat release measurements provide useful information for product development by giving a quantitative measure of specific changes in fire performance caused by component and composite modifications. Heat release data from this test method will not be predictive of product behavior if the product will not spread flame over its surface under the fire exposure conditions of interest. 5.4 The fire-test-response characteristics determined by this test method are affected by the thickness of the material used as test specimen, whether as a plaque or as coating on a wire or cable. The diameter of the wire or cable used will also affect the test results. 5.5 A radiant exposure is used as an energy source for this test method. This type of source has been used for comparison with heat release rate and flame spread studies of insulating materials constructed into cables when burning in a vertical cable tray configuration (Test Methods D5424 and D5537 ) ( 2- 9 ). No definitive relationships have been established. 5.6 The value of heat release rate corresponding to the critical limit between propagating cable fires and non-propagating fires is not known. 5.7 This test method does not determine the net heat of combustion. 5.8 It has not been demonstrated that this test method is capable of predicting the response of electrical or optical fiber cables in a full scale fire. In particular, this test method does not address the self-extinguishing characteristics of the cables in a full scale fire.

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