1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULJULY 24, 20151UL 331COutline of Investigation for Fuel Filtration UnitsIssue Number: 1July 24, 2015Summary of TopicsThis is the first issue of the Outline of Investigation for Fuel FiltrationUnit
2、s, UL 331C.ULs Outlines of Investigation are copyrighted by UL. Neither a printed norelectronic copy of an Outline of Investigation should be altered in any way. All ofULs Outlines of Investigation and all copyrights, ownerships, and rights regardingthose Outlines of Investigation shall remain the s
3、ole and exclusive property of UL.COPYRIGHT 2015 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULJULY 24, 2015UL 331C2No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTI
4、ON WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .52 Components 53 Units of Measurement .64 Undated References 65 Glossary .6CONSTRUCTION6 General 67 Enclosure 78 Accessibility of Uninsulated Live Parts and Film-Coated Wire .119 Protection Against Corrosion 1610 Supply Connections .1710.1 Co
5、rd-connected products 1710.2 Strain relief 1710.3 Bushings 1810.4 Permanently connected products .1810.5 Supply connections suitable for conversion 2011 Grounding .2112 Current Carrying Parts 2213 Internal Wiring 2313.1 Mechanical protection .2313.2 Wiring insulation .2313.3 Splices and connections
6、2314 Separation of Circuits .2415 Insulating Materials .2416 Spacings 2517 Protection of Service Personnel 2718 Pumps 2819 Valves .2819.1 Electrically operated valves 2819.2 Manually operated valves .2820 Gauges 2821 Piping, Tubing, and Fittings 2822 Flexible Metallic Hoses 3023 Control Panels .3024
7、 Filters and Strainers .3025 Electric Heaters 31PROTECTION OF USERS AGAINST INJURY26 General 3127 Sharp Edges .3128 Guards 3129 Strength of Enclosures 3230 Surface Temperatures .3231 Stability 3232 Strength of Mounting Means .33JULY 24, 2015 UL 331C 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHE
8、R REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULPERFORMANCE33 General 3334 Deformation Test .3335 Leakage Test 3436 Dimensional Stability Test .3537 Weight Change Test 3538 Hydrostatic Strength Test 3639 Moist Ammonia Air Stress Cracking Test 3740 Input Test 3741 Leakage Current Test .3842 T
9、emperature Test .4042.1 General .4042.2 Maximum normal load 4443 Capacitor Discharge Test 4444 Dielectric Voltage Withstand Test .4544.1 General .4544.2 Primary circuits 4544.3 Secondary circuits 4645 Starting Current Test 4646 Grounding Continuity Test .4747 Strain Relief Test .4747.1 Pull relief t
10、est 4747.2 Push back relief test 4848 Humidity Conditioning .4849 Rain Test 4850 Mounting Tests .5151 Stability Test .5152 Durability Test 5153 Impact Test 52MARKING54 General 5355 Identifying and Rating Information 5456 Cautionary Marking .55INSTRUCTIONS57 General 5658 Instructions Pertaining to Ri
11、sk of Fire, Electric Shock, or Injury to Persons .5759 Installation Instructions 5860 Operating Instructions .5861 User Maintenance Instructions .5962 Moving, Transporting, and Storage Instructions .59JULY 24, 2015UL 331C4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION
12、 WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 This outline covers fuel filtration units rated 600 V or less. These units are intended for use with oneor more of the following:a) Diesel fuel and diesel fuel/biodiesel blends with nominal biodiesel concentrations up to 5percent (B0 B5) formulated i
13、n accordance with the Standard Specification for Diesel Fuel Oils,ASTM D975.b) Kerosene formulated in accordance with the Standard Specification for Kerosine, ANSI/ASTM D3699.c) Fuel oil (heating oil) formulated in accordance with the Standard Specification for Fuel Oils,ASTM D396.1.2 These devices
14、are intended to be installed in accordance with the National Electrical Code,ANSI/NFPA 70.1.3 This outline does not cover fuel filtration units for use with fuels other than as mentioned in 1.1.1.4 This outline does not cover filters or strainers themselves. These devices are covered under theStanda
15、rd for Strainers for Flammable Fluids and Anhydrous Ammonia, UL 331, or the Outline ofInvestigation for Strainers for Diesel Fuel, Biodiesel Fuel, Diesel/Biodiesel Blends with Nominal BiodieselConcentrations Up to 20 Percent (B20), Kerosene, and Fuel Oil, UL 331B.2 Components2.1 Except as indicated
16、in 2.2, a component of a product covered by this outline shall comply with therequirements for that component.2.2 A component is not required to comply with a specific requirement that:a) Involves a feature or characteristic not required in the application of the component in theproduct covered by t
17、his outline, orb) Is superseded by a requirement in this outline.2.3 A component shall be used in accordance with its rating established for the intended conditions ofuse.2.4 Specific components are incomplete in construction features or restricted in performance capabilities.Such components are int
18、ended for use only under limited conditions, such as certain temperatures notexceeding specified limits, and shall be used only under those specific conditions.JULY 24, 2015 UL 331C 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL3 Units of M
19、easurement3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.3.2 Values of voltage and current are rms values, unless otherwise indicated.4 Undated References4.1 Any undated reference to a code or standard appearing in the requi
20、rements of this outline shall beinterpreted as referring to the latest edition of that code or standard.5 Glossary5.1 For the purpose of this standard the following definitions apply.5.2 GASOLINE/ETHANOL BLENDS Blended fuels composed of a gasoline component and anethanol component. The numerical val
21、ue corresponding to the ethanol component determines the blendrating (such as E85 for 85% ethanol, 15% gasoline).5.3 HAZARDOUS LOCATIONS Locations in which flammable gases or vapors are or may bepresent in the air in quantities sufficient to produce explosive or ignitable mixture5.4 SECONDARY CIRCUI
22、T A circuit supplied from a secondary winding of an isolating transformer.CONSTRUCTION6 General6.1 A product shall employ materials found by investigation to be acceptable for the intended application.6.2 A product shall be assembled so that it will not be adversely affected by the vibration of norm
23、aloperation.6.3 The construction shall be such that parts can be replaced or reassembled to function as intendedafter being dismantled.6.4 The device shall incorporate provisions for support independent of piping, tubing, or conduit that maybe connected thereto.6.5 The frame or chassis of the device
24、 shall not be used to carry current during intended operation.6.6 Products shall be suitable for an intended ambient temperature range of minus 31 to 104F (minus35 to 40C).JULY 24, 2015UL 331C6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL7
25、Enclosure7.1 A product shall be formed and assembled so that it will have the strength and rigidity necessary toresist the abuses to which it is likely to be subjected, without resulting in a risk of fire, electric shock, orinjury to persons due to total or partial collapse with resulting reduction
26、of spacings, loosening ordisplacement of parts, or other defects.7.2 Cast and sheet-metal portions of an enclosure shall not be thinner that the applicable values specifiedin Table 7.1.Table 7.1Thickness of enclosure metalMinimum thickness, in (mm)Metal At a small flat unreinforcedsurface and at a s
27、urface of ashape or size to providemechanical strengthAt a surface to which a wiringsystem is to be connected in thefieldAt a relatively large unreinforcedflat surfaceDie-cast metal 3/64 (1.2) 5/64 (2.0)Cast malleableiron1/16 (1.6) 3/32 (2.4)Other cast metal 3/32 (2.4) 1/8 (3.2)Uncoated sheetsteel0.
28、026 (0.66) 0.032 (0.81) 0.026 (0.66)Galvanizedsheet steel0.029 (0.74) 0.034 (0.86) 0.029 (0.74)Nonferroussheet metal0.036 (0.91) 0.045 (1.14) 0.036 (0.91)7.3 Among other factors that should be considered when judging the acceptability of a nonmetallicenclosure are:a) Mechanical Strength;b) Resistanc
29、e to impact;c) Moisture absorptive properties;d) Flammability; ande) Resistance to distortion at temperatures to which the material may be subjected underconditions of normal or abnormal usage.7.4 An enclosure of polymeric material shall comply with the applicable requirements for products that aren
30、ot categorized as household use only as contained in the Standard for Polymeric Materials Use inElectrical Equipment Evaluations, UL 746C.JULY 24, 2015 UL 331C 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL7.5 An enclosure of polymeric mate
31、rial shall be subjected to the Resistance to Impact Test described inthe Standard for Polymeric Materials Use in Electrical Equipment Evaluations, UL 746C before and aftercold conditioning at minus 31F (minus 35C ) for 3 hours. After each test, the enclosure shall comply with7.1.7.6 The enclosure of
32、 a product shall prevent molten metal, burning insulation, flaming particles, or the likefrom falling on flammable materials, including the surface upon which the product is supported.7.7 The requirement in 7.6 will necessitate that a switch, a relay, a solenoid, or the like, be individuallyand comp
33、letely enclosed, except for terminals, unless it can be shown that malfunction of the componentwould not result in a risk of fire, or there are no openings in the bottom of the product enclosure. It willalso necessitate the use of a barrier of nonflammable material:a) Under a motor unless:1) The str
34、uctural parts of the motor or of the product provide the equivalent of such abarrier;2) The protection provided with the motor is such that no burning insulation or moltenmaterial falls to the surface that supports the product when the motor is energizedunder each of the following fault conditions:i
35、) Open main winding,ii) Open starting winding,iii) Starting switch short-circuited, andiv) Capacitor of permanent-split capacitor motor short circuited - the short-circuit is to be applied before the motor is energized, and the rotor is to belocked;3) The motor is provided with a thermal motor prote
36、ctor - a protective device that issensitive to temperature and current - that will prevent the temperature of the motorwindings from exceeding 257F (125C) under the maximum load under which themotor will run without causing the protector to cycle and from exceeding 302F(150C)with the rotor of the mo
37、tor locked;4) The motor complies with the requirements for impedance-protected motors in eitherthe Standard for Overheating Protection for Motors, UL 2111, or the Standard forImpedance Protected Motors, UL 1004-2, and the temperature of the motor winding willnot exceed 302F(150C) during the first 72
38、 hours of operation with the rotor of themotor locked; or5) A vertically mounted motor is supplied with a metal screen on the end bell having amesh with nominal openings not greater than 0.079 inch (2 mm) between center linesand with wire diameters of not less than 0.018 inch (0.45 mm) or if the mot
39、or complieswith the Hot Flaming Oil Test in the Standard for Information Technology Equipment -Safety - Part 1: General Requirements, UL 60950-1.b) Under wiring, unless the wire is marked VW-1.JULY 24, 2015UL 331C8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT
40、 PERMISSION FROM UL7.8 The barrier mentioned in 7.7 shall be horizontal, shall be located as indicated in Figure 7.1, and shallnot have an area less than that described in that illustration. Openings for drainage, ventilation, and thelike may be employed in the barrier, provided such openings would
41、not permit molten metal, burninginsulation, or the like to fall on flammable material.This is generated text for figtxt.JULY 24, 2015 UL 331C 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULFigure 7.1Location and extent of barrierNOTES A Regi
42、on to be shielded by barrier. This will consist of the entire component if it is not otherwise shielded and will consist of theunshielded portion of a component that is partially shielded by the component enclosure or equivalent.B Projection of outline of component on horizontal plane.C Inclined lin
43、e that traces out minimum area of barrier. The line is always1) Tangent to the component,2) 5 degrees from the vertical, and3) Oriented so that the area traced out on a horizontal plane is maximum.D Location (horizontal) and minimum area for barrier. The area is that included inside the line of inte
44、rsection traced out by theinclined line C and the horizontal plane of the barrier.JULY 24, 2015UL 331C10UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL7.9 A door or a cover of an enclosure that provides access to any overload-protective devic
45、e that requiresresetting or renewal shall be hinged or otherwise attached in an equivalent manner.7.10 Means shall be provided for holding the door or cover over a fuseholder in a closed position, andthe door or cover shall be tight-fitting.7.11 An enclosure of a unit shall be considered suitable fo
46、r outdoor use and shall comply with the RainTest, Section 49.8 Accessibility of Uninsulated Live Parts and Film-Coated Wire8.1 To reduce the likelihood of unintentional contact that may involve a risk of electric shock from anuninsulated live part or film-coated wire, an opening in an enclosure shal
47、l comply with either (a) or (b).a) For an opening that has a minor or dimension (see 8.5) less than 1 inch (25.4 mm), such apart or wire shall not be contacted by the probe illustrated in Figure 8.1.b) For an opening that has a minor dimension of 1 inch (25.4 mm) or more, such a part orwire shall be
48、 spaced from the opening as specified in Table 8.1.Exception: A motor other than one used in either a hand-held product or a hand-supported portion of aproduct need not comply with these requirements if it complies with the requirements in 8.2.Table 8.1Minimum acceptable distance from an opening to
49、a part that may involve a risk of electric shockMinor dimensionaof opening, Minimum distance from opening to partinches (mm)binches (mm)b3/4c(19.1) 4-1/2 (114.01c(25.4) 6-1/2 (165.0)1-1/4 (31.8) 7-1/2 (190.0)1-1/2 (38.1) 12-1/2 (318.0)1-7/8 (47.6) 15-1/2 (394.0)2-1/8 (54.0) 17-1/2 (440.0)d 30 (762.0)aSee 8.5.bBetween 3/4 inch and 21/8 inches (19 and 54 mm) interpolation is to be used to determine a value between valuesspecified in the table.cAny dimension less than 1 inch (25 mm) applies to a motor only.dMore than 21/8 inches (54 mm), but n
