UL 924-2020 pdf free download

UL 924-2020 pdf free download.Emergency Lighting and Power Equipment.
9 Environmental Rating
9.1 An enclosure shall not be marked with a type designation unless it has been determined to comply with the requirements applicable to that designation (s) as specified in the Standard for Enclosures for Electrical Equipment, UL 50.
9.2 An enclosure shall not be marked raintight,” rainproof,”“watertight,” or with other similar terms suggesting suitability for specific environmental conditions, unless the enclosure has been determined to comply with the requirements applicable to the corresponding type designation (s) specified in the Standard for Endosures for Electrical Equipment, UL 50.
9.3 The integrity of an enclosure marked with a type designation shall not be compromised by the introduction of openings or by the penetration of unevaluated fittings or component parts through the enclosure wall. Only fittings or component parts that have been evaluated and marked with a type designation equal to or better than that of the enclosure shall be used and installed in accordance with the part manufacturer’s instructions. The enclosure type designation shall be removed in all other circumstances unless the completed assembly is reevaluated and found to comply with the applicable requirements in the Standard for Enclosures for Electrical Equipment, UL 50.
9.4 Equipment intended for use in damp or wet locations shall be evaluated for compliance with Supplements SB or SC, as applicable.
10 Polymeric Materials
10.1 General
10.1.1 Polymeric materials used for the purposes covered by 102 — 10.6 shall comply with the applicable requirements of this section. When a material is used for more than one purpose, compliance with all relevant properties Is required. Materials that have not been identified as conforming to any required performance characteristic shall comply with the applicable alternative evaluation program of the Standard for Polymeric Materials — Use in Electrical Equipment Evaluations, UL 746C.
10.1.2 When there are any uninsulated live parts that represent a risk of fire located within 0.032 inches (0.8 mm) of a polymeric material covered by this section. the material shall additionally have hot-wire ignition (HWI) and high-current arc resistance to ignition (HAl) ratings of 3 or less.
10.1.3 When there are any arcing parts, such as unenclosed switch contacts, located within 0.5 inches (13 mm) of a polymeric material covered by this section, the material shall additionally have a hot-wire ignition (HWI) rating of 3 or less.UL 924-2020 pdf free download.