1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULJune 20, 20051SUBJECT 347BOUTLINE OF INVESTIGATIONFORMEDIUM VOLTAGE MOTOR CONTROLLERS, UP TO 15KVIssue No: 1June 20, 2005Summary of TopicsThis First Issue of Outline of Investigation, SUBJECT 347
2、B, coversrequirements for industrial control equipment and associated componentsincorporating static switching elements, having a-c voltage ratings above1500 V, up to 15 kV, and equipment incorporating electro-mechanicalcontactors with ratings above 7200 V, up to 15 kV intended for starting,stopping
3、, regulating, controlling, or protecting electric motors or otherelectrical loads including refrigeration equipment.COPYRIGHT 2005 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULJUNE 20, 2005SUBJECT 347B2No Text
4、on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .52 Glossary .53 Components 74 Units of Measurement .75 Undated References 7CONSTRUCTION6 General 77 Enclosure 87.1 General .87.2 Outdoor Enclosures .178 A
5、rrangement of Components 199 Guarding and Accessibility Of Live Parts 1910 Grounding and Bonding .2011 Protective Devices 2112 Overload Relays 2213 Isolating Means .2314 Interlocking 2415 Automatic Restarting 2516 Power Circuit Wiring 2516.1 General .2516.2 Wire bending space 2616.3 Restricting barr
6、iers .2617 Control Circuit Wiring 2817.1 Internal wiring 2817.2 Cord-connected circuits internal control .2917.3 Equipment over 7200 V .2918 Field Connected Control Circuit Terminals .3019 Spacings 3019.1 General .3019.2 Circuits of 600 V or less to ground .3220 Current Carrying Parts 33PERFORMANCE2
7、1 General 3322 Operating Voltage Test 3523 Short Time Capability Test Controllers without Static Switching Devices .3524 Short Time Capability Test Controllers with Static Switching Elements .3525 Temperature Test .3625.1 General .3625.2 Test conditions .3825.3 Temperature tests for equipment with s
8、tatic switching elements 3926 Make and Break Capability Test Electromechanical Contactors .3927 Make and Break Capability Test Static Switching Elements 4028 Overload Test Contactors Used in Controllers 4129 Overload Test Static Switching Elements Used in Controllers 45JUNE 20, 2005 SUBJECT 347B 3UL
9、 COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL29.1 General .4529.2 Controllers with automatic bypass circuitry 4529.3 Controllers without automatic bypass circuitry 4530 Mechanical Operation and Interlock Integrity Test .4531 Switching Capabil
10、ity Test Isolating Means 4632 Dielectric Voltage-Withstand Test .4632.1 General .4632.2 Meters 4732.3 Test procedure .4733 Short Circuit Interruption Test 4834 Dielectric Voltage-Withstand (Repeated) Test 5235 Short-Circuit Withstand Test .5236 Momentary Current Test .5336.1 Main bus test 5336.2 Gro
11、und bus test 5336.3 Test duration and bracing of connections 5336.4 Test-circuit conditions .5436.5 Test Circuit 5436.6 Performance .5437 Short Time Current Withstand Test .5437.1 General .5437.2 Main bus test 5537.3 Ground bus test 5537.4 Test Circuit Conditions 5537.5 Performance .5638 Impulse Wit
12、hstand Test 5639 Water Spray Test .5740 Accelerated Aging of Gaskets Tests 5841 Impact and Pressure Tests Viewing Panes 5842 Metallic Coating Thickness Tests .5943 Calibration Tests Overload Relays 60RATING44 General 61MARKING45 General 62JUNE 20, 2005SUBJECT 347B4UL COPYRIGHTED MATERIAL NOT AUTHORI
13、ZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 These requirements cover the following types of industrial control equipment and associatedcomponents intended for starting, stopping, regulating, controlling, or protecting electric motors or otherelectrica
14、l loads including refrigeration equipment:a) Equipment incorporating static switching elements, having a-c voltage ratings above 1500 V,up to 15 kV; andb) Equipment incorporating electro-mechanical contactors with ratings above 7200 V, up to 15kV.1.2 The requirements do not cover equipment consistin
15、g solely of electronic or static devices, circuits, orsystems, nor do they cover electronic variable speed motor controllers (power conversion equipment).1.3 These requirements cover equipment intended for use in ordinary locations in accordance with theNational Electrical Code.1.4 Fire Pump Control
16、lers are covered by the requirements in the Standard for Fire Pump Controllers, UL218.1.5 These requirements do not cover the internal construction of electrical instruments (such as meters)or equipment for use in Hazardous locations as defined in the National Electrical Code.1.6 Where noted in this
17、 Outline, requirements specified in the Standard for High Voltage Industrial ControlEquipment, UL 347, fourth edition, apply to these products.2 Glossary2.1 AWG Wherever it appears in this outline, the abbreviation AWG means American Wire Gauge.2.2 BUS A conductor, or group of conductors, that serve
18、 as a common connection for two or morecircuits.2.3 BUS, METAL-ENCLOSED An assembly of rigid conductors with associated connections, jointsand insulating supports within a grounded metal enclosure.2.4 CAPABILITY, INTERRUPTING The interrupting capability is the maximum value of current that acontact
19、assembly is required to successfully interrupt at a specified voltage for a limited number ofoperation under specified conditions. The term is usually applied to abnormal or emergency conditions.2.5 CAPABILITY, SHORT-TIME The short-time capability is the ability of electrical apparatus tooperate wit
20、hin specified performance criteria when carrying electrical overloads of a specified currentand time duration under specified conditions.2.6 CONTACTOR A contactor is a device for repeatedly establishing and interrupting an electricpower circuit.2.7 CONTACTOR, MAGNETIC A magnetic contactor is a conta
21、ctor actuated by electromagneticmeans.JUNE 20, 2005 SUBJECT 347B 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL2.8 CONTACTS, AUXILIARY Auxiliary contacts of a switching device are contacts in addition to themain-circuit contacts and functio
22、n with the movement of the latter.2.9 CONTROL, INDUSTRIAL Industrial control is broadly the methods and means of governing theperformance of an electric device, apparatus, equipment or system used in industry.2.10 CONTROL, REMOTE Remote control is a control function which provides for initiation or
23、changeof a control function from a remote point.2.11 CONTROL, THREE-WIRE Three-wire control is a control function which utilizes a momentary-contact pilot device and a holding circuit contact to provide undervoltage protection.2.12 CONTROL, TWO-WIRE Two-wire control is a control function which utili
24、zes a maintained-contact type of pilot device to provide undervoltage release.2.13 CONTROL CIRCUIT The control circuit of a control apparatus or system is the circuit whichcarries the electric signals directing the performance of the controller but does not carry the main powercircuit.2.14 CONTROL-C
25、IRCUIT TRANSFORMER A control-circuit transformer is a voltage transformerutilized to supply a voltage for the operation of control devices.2.15 CONTROLLER A device, or group of devices, which serves to govern, in some predeterminedmanner, the electrical power delivered to the apparatus to which it i
26、s connected.2.16 CONTROLLER CLASS E1 Class E1 controllers employ their contacts for both starting andstopping a motor and interrupting short circuits or faults exceeding operating overloads.2.17 CONTROLLER CLASS E2 Class E2 controllers employ their contacts for starting and stoppinga motor and emplo
27、y high-voltage motor circuit fuses for interrupting short circuit or faults exceedingoperating overloads.2.18 DRAW OUT-MOUNTED DEVICE One having disconnecting devices and in which the removableportion may be removed from the stationary portion without the necessity of unbolting connections ormountin
28、g supports.2.19 DROP-OUT, VOLTAGE OR CURRENT The drop-out voltage or current of a magneticallyoperated device is the voltage (or current) at which the device will return to its de-energized position.2.20 DUTY, CONTINUOUS Continuous duty is a requirement of service which demands operation ata substan
29、tially constant load for an indefinitely long time.2.21 ENCLOSURE An enclosure is a surrounding case designed to protect:a) Personnel against injury due to accidental contact with electrical or moving mechanical partsof the enclosed device(s).b) Internal device(s) against specified external conditio
30、ns.2.22 FAULT CURRENT Fault current is a current that results from the loss of insulation betweenconductors or between a conductor and ground.2.23 HIGH-VOLTAGE As used in this outline, a nominal voltage higher than 600 V.JUNE 20, 2005SUBJECT 347B6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER RE
31、PRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL3 Components3.1 A component of a product covered by this Outline shall comply with the requirements for thatcomponent and shall be used in accordance with its recognized rating and other limitations of use. SeeAppendix A of UL 347 for a list of sta
32、ndards covering components used in the products covered by thisoutline. 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 this outline, orb) Is superseded by a requi
33、rement in this outline.3.2 Components, such as contactors, overload relays, push-button stations, pilot lights, and the like, rated600 V or less shall comply with the Standard for Industrial Control Equipment, UL 508.3.3 A valve-type surge arrester employed in a motor controller shall comply with Ce
34、rtification TestProcedures for Arresters Applied to Unit Substations, Section 13, of the Standard for Surge Arresters forAlternating-Current Power Circuits, ANSI/IEEE C62.1-1989. Metal oxide type surge arresters shall complywith IEEE Standard for Metal-Oxide Surge Arresters for AC Power Circuits ( 1
35、 kV), ANSI/IEEEC62.11-1999.4 Units of Measurement4.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.5 Undated References5.1 Any undated reference to a code or standard appearing in the requirements of this standard shall beinter
36、preted as referring to the latest edition of that code or standard.CONSTRUCTION6 General6.1 Industrial control equipment as covered by this outline shall:a) Be so constructed as to provide for compliance with the rules for installation and use of suchequipment as given in the National Electrical Cod
37、e, ANSI/NFPA 70.b) Employ materials that are acceptable for the particular use.c) Be made and finished with the degree of uniformity and grade of workmanship practicable ina well equipped factory.JUNE 20, 2005 SUBJECT 347B 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTI
38、ON WITHOUT PERMISSION FROM UL7 Enclosure7.1 General7.1.1 The enclosure of industrial control equipment shall be so constructed and assembled that it willhave the strength and rigidity necessary to resist the abuses to which it is likely to be subjected, withouttotal or partial collapse resulting in
39、an increased risk of fire due to reduction of spacings, loosening ordisplacement of parts, or other serious defects.7.1.2 Nonmetallic materials may be used as all or part of an enclosure if found acceptable for theapplication, as determined by investigation.7.1.3 Among the factors taken into conside
40、ration when the acceptability of a nonmetallic material is beingdetermined are its:a) Physical strength;b) Resistance to impact;c) Moisture-absorptive properties;d) Combustibility; ande) Resistance to distortion at temperatures to which it may be subjected under conditions ofnormal and abnormal use.
41、These factors are considered with respect to thermal aging.7.1.4 Unless the enclosure is of a material that will resist corrosion, both inside and outside surfaces shallbe protected by painting, galvanizing, plating, or other equivalent means.7.1.5 A part of the enclosure, such as a door, cover, or
42、tank, shall be provided with a means, such aslatches, locks, interlocks, or captive fasteners, for firmly securing it in place. Such fasteners shall be solocated or used in multiple so as to hold the door or cover closed over its entire length. A hinged covermore than 48 inches (1219 mm) long on the
43、 hinged side shall have at least a two point latch operated bya single knob or handle, or at least two captive fasteners.7.1.6 An enclosure cover shall be hinged if it gives access to fuses or any other overload-protectivedevices, the functioning of which requires renewal, or if it is necessary to o
44、pen the cover in connectionwith the operation of the device.7.1.7 A door or cover shall shut closely against a 1/4-inch (6.4-mm) rabbet (as shown in Figure 7.1) orthe equivalent, or shall have flanges for the full length of the four edges. Flanges on a door or cover shallfit closely with the outside
45、 walls of the box proper and shall not be less than 7/16 inch (11.1 mm) in depth.A combination of flange and rabbet is acceptable. Figure 7.2 illustrates typical constructions that areconsidered to comply with this paragraph. Other constructions may be evaluated.This is generated text for figtxt.7.1
46、.8 To determine whether a flanged door or cover complies with the requirement in 7.1.7 regardingdepth of flange, the distance between the flat portion of the door or cover clear of forming radii, beads,draws, and the like and a straight edge placed across any two flanges at any points is to be measu
47、red.JUNE 20, 2005SUBJECT 347B8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL7.1.9 If the rabbet construction mentioned in 7.1.7 is not employed, there shall be an overlap of not lessthan 7/16 inch (11.1 mm) at each edge at which a telescopin
48、g door or cover meets the cabinet or box ofa surface- mounted enclosure.7.1.10 To determine whether a telescoping door or cover complies with the requirement in 7.1.9, the dooror cover is to be in its normally closed position, and a mark scribed on all walls of the box along the edgeof the flange. T
49、he overlap is the measured distance W between the scribed marks and the edges of thebox walls, as shown in Figure 7.3. In scribing the marks, the door or cover is to be held in a fixed positionwith sufficient firmness to prevent displacement of the cover by the scribing tool, but without bending ordistorting any portion of the box, door, or cover, or other part of the enclosure.This is generated text for figtxt.7.1.11 A flat strip used to provide a rabbet, or an angle strip fastened to the edges of a door or c
copyright@ 2008-2019 麦多课文库（www.mydoc123.com）网站版权所有
备案/许可证编号：苏ICP备17064731号-1