UL Standard for Safety Fire Test for Heat and Visible Smoke Release for Discrete Products and Their Accessories Installed in Air-Handling Spaces (Fourth Edition)
This is a fire test method for determining the fire performance response of discrete products (including@ but not limited to electrical@ mechanical@ and plumbing equipment) intended to be installed in air handling spaces@ such as above suspended ceilings or below floors. These products are subjected to an open flame ignition source and evaluated using a product calorimeter. This test may be used to determine fire performance and smoke characteristics of discrete@ non-continuous building materials where the Test for Surface Burning Characteristics of Building Materials@ UL 723@ is not applicable. The purpose of this test is to determine the rate of heat release and the rate of smoke release of the burning product samples as they relate to the requirements for fire-resistant and low-smoke-producing characteristics in accordance with the provisions of the following codes: National Electric Code@ NFPA 70; International Mechanical Code@ NFPA 5000; Standard for the Installation of Air Conditioning and Ventilating Systems@ NFPA 90A. This test method does not provide information on the performance of products in other fire or test conditions. This test does not investigate the toxicity of the products of combustion. This test does not cover the constructional@ electrical@ or other performance requirements of the product. The Codes noted in 1.3 reference the use of UL 2043 for electrical equipment with combustible outer enclosures. Specifically@ the ?National Electrical Code? and the ?International Mechanical Code? expressly state that electrical equipment with metal enclosures shall be permitted. Consequently@ UL 2043 is not intended to apply to electrical equipment with metal outer enclosures unless otherwise specified by end-product-standard requirements.