UL 751-2012 pdf download

UL 751-2012 pdf download.Vending Machines.
14.5 When a vending machine is examined in connection with the requirement in 14.1. it is assumed that any part of the outer enclosure that can be removed without the use of tools or keys does not provide protection against electric shock.
14.6 An uninsulated live part shall be located or guarded so that it is not likely to be contacted by a route person while performing such routine, penodic service operations as collecting. retamprng, lubricating, or control adjusting.
Exception: A live part may be accessible if the voltage is 42,4 volts peak or less or if the available current measured through a t500•ohm noninductive resistor is 5 milliamperes or less.
14.7 The requirement in 14.6 will necessitate the use of an enclosure, cover, or barrier over an uninsulated live part that the route person may inadvertently touch while servicing or adjusting the vending machine. A cover or barrier that must be removed to perform a servicing function is not considered to provide the required protection.
14.8 Unless the vending machine is marked in compliance with 75.2, a Lampholder, a fuseholder, and a circuit breaker shall be installed or protected so that adjacent uninsulated high-voltage live parts. other than the screw shell of a lampholder or plug fuseholder. cartridge fuse dips, or wiring terminals to the tusetiolder will not be exposed to contact by persons servicing the lamp, fuse, or circuit breaker. A separation of less than 4 inches (102 mm) from the Insulating body of a fuse is considered to be adjacent. A barrier of vulcanized fiber or similar material employed as a guard for uninsulated Wgh-voltage live parts shall be at least 0.028 inch (0.71 mm) thick.
15 Protection Against Corrosion
15.1 lion and steel parts shall be protected against corrosion by enameling, galvanizing, plating, or other equivalent means if the corrosion of such unprotected parts might result in a risk of fire, electric shock, or injury to persons.
Exception No. 1: Bearings, laminations, or minor parts of iron or steel, such as washers, screws, and the like, need not be protected against corrosion.
Exception No. 2: The sheath of a heating element other than the immersion type need not be protected against corrosion.
Exception No. 3: If the oxidation of iron or steel due to the exposure of the metal to air and moisture is not likely to be appreciable— thickness of metal and temperature also being factors — surfaces of sheet steel arid cast-iron parts within an enclosui’e may not be required to be protected against corrosion.
15.2 The sheath employed to enclose a heating element of an immersion-type heater shall be of a metal resistant to corrosion by the liquid in which the heater is intended to be immersed.
15.3 An electrical enclosure of sheet steel exposed to the effects of weathering shall be protected against corrosion as specified in 15.4 — 15-9 or by other metallic or nonmetallic coatings that have been shown to give equivalent protection.
15.4 The requirements of 15.3 do not apply to a motor enclosure if the motor is contained within the vending machine enclosure.
15.5 An endosure with a thickness of 0.053 in (1.35 mm) or greater and that is contained within another enclosure, shall be protected by one of the following coatings:
a) Hot-dipped mill-galvanized sheet steel that complies with the coating Designation G60 or A60 In Table I of Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process. ASTM Designation A653. with not less than 40 percent of the zinc on any side, based on the minimum single spot test requirement in this ASTM designation. The weight of the coating is to be established using any method acceptable for the purpose. In case of question, the weight of coating is to be established in accordance with the test method of Standard Test Method for Weight [Mass] of Coating on Iron and Steel Articles with Zinc or Zinc-Alloy Coatings, ASTM Designation A90.
b) A zinc coating, other than that provided on hot-dipped mill-galvanized sheet steel, uniformly applied to an average thickness of not less than 0.00041 in (10.4 pm) on each surface with a minimum thickness of 0.00034 in (8.6 pm). The thickness of the coating is to be established by the Metallic Coating Thickness Test, Section 61.
C) Two coats of an organic finish of the epoxy or alkyd-resan type or other outdoor paint on both surfaces. The suitability of the paint is to be determined by consideration of its composition or by corrosion tests if such tests are considered necessary.
15.6 For an enclosure intended to provide the only enclosure of a current-carrying part or has a thickness less than 0.053 in (1.35 mm), protection shall be provided by one of the following coatings.