UL 79:2016 pdf free download – STANDARD FOR SAFETY Power-Operated Pumps for Petroleum Dispensing Products.
18 Hose Nozzle Valve, Hose, and Coupling
18.1 A pump assembly for use with interchangeable service-station type hose-nozzle valves is not prohibited from being furnished without a hose-nozzle valve when the assembly is marked as specified in 74.4(a). A pump assembly not for use with interchangeable service-station type hose-nozzle valves is not prohibited from being furnished without a hose-nozzle valve when the assembly is marked as specified in 74.4(b).
18.2 When a hose assembly, consisting of hose and couplings, is supplied with the pump assembly, it shall have nonferrous couplings attached and comply with the Standard for Hose and Hose Assemblies for Dispensing Flammable Liquids, UL 330.
19 Conduit Seals
19.1 A factory-installed conduit seal incorporated as part of the product shall comply with the requirements of the Leakage Test, Section 43: the Leakage of Wire Seal Test, Section 44; and the Hydrostatic Strength Test, Section 49,
19.2 When a conduit seal is incorporated with the product, the wires or conductors shall be securely held and tightly sealed where they pass into the enclosure. When a sealing compound or cement is used it shall:
a) Provide a tight fit;
b) Neither soften nor crack under service conditions:
C) Be resistant to the solvent action of the liquids and vapors to which it is capable of being exposed — see the Tests on Sealing Compounds, Section 55:
d) Be resistant to moisture and aging: and
e) Have a depth equal to the inside diameter of the conduit or 58 inch (15.9 mm). whichever is greater.
The sealing compound used in a conduit seal shall not flow or creep at the operating temperature of the device. Sealing compounds that soften with the application of heat shall have a softening point of not less than 200°F (93.3°C) when used adjacent to motors having Class A (Class 105) insulation and not less than 236°F (113.3°C) when used adjacent to motors having Class B (Class 130) insulation. The softening point is to be determined in accordance with the Standard Test Method for Softening Point by Ring-and-Ball Apparatus. ASTM E28.
19.3 When a nipple is used to retain the sealing compound for lead wires, the depth of the seal shall not be less than the internal diameter of the nipple or 58 inch (15.9 mm). whichever is greater. Depending on the compound. the size of the lead wires. and the construction of the sealing well. a greater depth of sealing compound shall be used as required to form a tight seal. Means shall be provided in the nipple to anchor the sealing compound.
20 Electrical Equipment
20.1 Electrical conduit to be immersed in the liquid to be handled shall be of the rigid, seamless, metallic type or other material that has been determined to be equivalent.
20.2 Electrical equipment and wiring shall be arranged so that the liquid does not drip or drain on them during the intended care and usage of the pump assembly.
20.3 Wiring shall be in threaded rigid metal conduit, threaded steel intermediate metal conduit, or Type Ml cable with termination fittings that comply with the requirements for Class I. Group D equipment for use in hazardous locations specified in the National Electrical Code. NFPA 70. All boxes. fittings, and joints shall be threaded for connection to conduit or cable terminations in compliance with the requirements in Class I, Group D equipment for use in hazardous locations. At least five full threads shall engage in each threaded joint.