UL 22:2009 pdf download.Amusement and Gaming Machines.
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.
82.5 A material with a flame-spread index gher 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 Iwo 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, UI 7460.
Exceplion: When f1akng or peei,ng of the coating will not result rn the reduction of spacings or the brkiging of (we parts that may present a risk of fire or electric shock, then the coating need not comply with UL 746G.
8.3 Enclosure bottom openings
8.31 The enclosure of an appliance shall prevent molten metal, burning insulation, flaming particles, or the like from falling on combustible materials, including the surface upon which the appliance is supported.
8.3.2 The requirement in 8,3.1 necessitates the use of a barrier or pan of noncombustible matenal:
a) Under a motor unless:
1) The structural parts of the motor or of the appliance provide a bamer that has been determined to be equivalent;
2) The overload protection provided with the motor is such that no burning insulation or molten material falls to the surface that supports the appliance when the motor Is energized under each of the following fault conditions:
i) Open main winding,
ii) Open auxiliary winding, and
iii) Starting switch short-circuited.
82.5 A material with a flame-spread index gher 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 Iwo 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, UI 7460.
Exceplion: When f1akng or peei,ng of the coating will not result rn the reduction of spacings or the brkiging of (we parts that may present a risk of fire or electric shock, then the coating need not comply with UL 746G.
8.3 Enclosure bottom openings
8.31 The enclosure of an appliance shall prevent molten metal, burning insulation, flaming particles, or the like from falling on combustible materials, including the surface upon which the appliance is supported.
8.3.2 The requirement in 8,3.1 necessitates the use of a barrier or pan of noncombustible matenal:
a) Under a motor unless:
1) The structural parts of the motor or of the appliance provide a bamer that has been determined to be equivalent;
2) The overload protection provided with the motor is such that no burning insulation or molten material falls to the surface that supports the appliance when the motor Is energized under each of the following fault conditions:
i) Open main winding,
ii) Open auxiliary winding, and
iii) Starting switch short-circuited.
