UL 22-2009 pdf download

UL 22-2009 pdf download – Amusement and Gaming Machines.
8.2 External materials 8.2.1 Materials such as steel, aluminum, wood, particle board, composite materials, glass, and other similar materials shall be used for the enclosure, guard, or cabinet of an appliance. Glass shall be heat-resistant, tempered, wired, or laminated. See 8.2.2 for small parts requirements. Exception No. 1 : Other materials may be used for part or all of an enclosure when they comply with the requirements in 8.1 .4, 8.2.3, and the Standard for Polymeric Materials– Use in Electrical Equipment Evaluations, UL 746C. Exception No. 2: Materials with a flammability rating of HB, V-2, V-1 , V-0, or 5V in accordance with the Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances, UL 94, or material determined to be equivalent may be used for part or all of a cabinet. See also 8.2.3. Exception No. 3: Materials that are classed HB, V-2, V-1 , V-0, or 5V in accordance with UL 94, or an equivalent material may be used as guards when they comply with 8.1 .4, 8.2.3, and 45.1 – 45.3. Exception No. 4: Ordinary glass may be used when the optical or flatness requirement precludes the use of heat-resistant, tempered, wired, or laminated glass. 8.2.2 The flammability requirements in Exception No. 1 to 8.2.1 does not apply to small parts. For the purpose of these requirements, a small part is defined as one that complies with both of the following items: a) A small part shall not be part of the appliance enclosure, or enclose live parts or be used to reduce the likelihood of electric shock. b) The location of a small part is such that it cannot propagate flame from one area to another or act as a bridge between a possible source of ignition and other ignitable parts.
8.2.4 The flame-spread index in 8.2.3(b) is the average value based on tests on six specimens representative of the wall thickness used, with no single specimen value greater than 300. 8.2.5 A material with a flame-spread index higher than specified in 8.2.3 may be used as the exterior finish or covering on any portion of the enclosure, guard, or cabinet if the flame-spread index of the combination of the base material and finish or covering complies with 8.2.3. 8.2.6 The size limitations mentioned in 8.2.3 refer to the exposed surface area of a single unbroken section. If two sides of a single piece are exposed, only the larger side is to be considered in computing the area. 8.2.7 A conductive coating applied to a surface (such as the inside surface of a cover or an enclosure) shall comply with the appropriate requirements in the Standard for Polymeric Materials – Use in Electrical Equipment Evaluations, UL 746C. Exception: When flaking or peeling of the coating will not result in the reduction of spacings or the bridging of live parts that may present a risk of fire or electric shock, then the coating need not comply with UL 746C.
8.3.4 Materials used for barriers have a flammability rating of V-2 or less in accordance with the Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances, UL 94. Additionally, barriers that are accessible to a maintenance person shall comply with the requirements in 8.1 .4 and 45.1 – 45.3. Exception: Barrier materials need not have a flammability rating of V-2 or less when they are one of the materials mentioned in 8.2.1 or comply with Exception Nos. 1 – 4 to 8.2.1 . 8.4 Medium- and high-pressure lamps 8.4.1 A medium-pressure lamp shall be enclosed or guarded to protect against breakage due to external forces or impacts. 8.4.2 A high-pressure lamp shall be enclosed so that an explosion of the lamp will be contained. See 54.1 9 for high-pressure lamp caution marking. 8.4.3 High-pressure lamps may be exploded within the enclosure of the appliance to determine compliance with 8.4.2.UL 22-2009 pdf download.