1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULMAY 22, 20141UL 347COutline of Investigation for Medium Voltage Solid State Resistive LoadControllers, Up to 15KVIssue Number: 1May 22, 2014Summary of TopicsThis First Issue of the Outline of Inv
2、estigation for Medium Voltage SolidState Resistive Load Controllers, Up to 15KV, UL 347C, coversrequirements for equipment incorporating solid state switching elementsintended for starting, stopping, regulating, controlling, or protectingheating and other resistive loads.ULs Outlines of Investigatio
3、n 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 sole and exclusive property of UL.COPYRI
4、GHT 2014 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULMAY 22, 2014UL 347C2No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINT
5、RODUCTION1 Scope .52 Definitions 53 Components 54 Units of Measurement .65 Undated References 6CONSTRUCTION6 General 67 Enclosures .68 Grounding and Bonding 69 Protective Devices 610 Isolating Means 711 Interlocking 712 Automatic Restarting .713 Wiring and Connections 814 Insulating Materials 815 Fi
6、eld Installed Accessories 816 Spacings 816.1 General 816.2 Circuits of 600 V or less to ground .1017 Current Carrying Parts 11PERFORMANCE18 General 1119 Temperature Test .1219.1 General .1219.2 Test conditions .1420 Overload Test 1521 Mechanical Tests .1522 Switching Capacity Test - Isolating Means
7、.1523 Dielectric Voltage-Withstand Test .1624 Fault Interruption Test .1625 Dielectric Voltage-Withstand (Repeated) Test 1826 Short-time, Momentary and Peak Withstand Current Bus Tests 1827 Driven Rain Test 1828 Mechanical tests of Viewing Panes .1829 Enclosure Ground Integrity Test 1830 Shutter Int
8、egrity Test 1831 Rod Entry Test .1832 Operation Tests 1832.1 General .1832.2 Single phasing .1932.3 Inoperative blower motor 1932.4 Clogged filter 2032.5 Acceptance criteria .20MAY 22, 2014 UL 347C 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FRO
9、M ULRATING33 General 20MARKING34 General 2035 General Markings for Controllers .2136 Additional Markings for Control Centers .2237 Conditional Markings 2238 Additional Equipment Information .24MAY 22, 2014UL 347C4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT
10、PERMISSION FROM ULINTRODUCTION1 Scope1.1 These requirements cover equipment incorporating solid state switching elements intended forstarting, stopping, regulating, controlling, or protecting heating and other resistive loads, having a-cvoltage ratings above 1500 V, up to 15 kV.1.2 The requirements
11、do not cover 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 Equipment intended for starting, stopping, regulating, controlling or protecting electric motors
12、 or otherelectrical loads including refrigeration equipment are covered by the requirements the Standard forMedium-Voltage AC Contactors, Controllers, and Control Centers, UL 347 or the Outline for MediumVoltage Motor Controllers, Up to 15 kV, Subject 347B.1.5 Where noted in this Outline, requiremen
13、ts specified in the Standard for Medium-Voltage ACContactors, Controllers, and Control Centers, UL 347, fifth edition, apply to these products.2 Definitions2.1 The definitions in Section 3 of the Standard for Medium-Voltage AC Contactors, Controllers, andControl Centers, UL 347 apply.3 Components3.1
14、 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 the Standard for Medium-Voltage AC Contactors, Controllers, and Control Centers, UL 347for
15、a list of standards covering components used in the products covered by this outline. A component isnot 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 supersed
16、ed by a requirement in this outline.3.2 Components, such as contactors, overload relays, push-button stations, pilot lights, and the like, rated1500 V or less shall comply with the Standard for Industrial Control Equipment, UL 508.MAY 22, 2014 UL 347C 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURT
17、HER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL4 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
18、 of this outline shall beinterpreted as referring to the latest edition of that code or standard.CONSTRUCTION6 General6.1 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 Ele
19、ctrical Code, ANSI/NFPA 70; andb) Employ materials that are acceptable for the particular use.7 Enclosures7.1 Equipment shall comply with the requirements in Section 5.102 of the Standard for Medium-VoltageAC Contactors, Controllers, and Control Centers, UL 347, fifth edition.8 Grounding and Bonding
20、8.1 The grounding and bonding requirements in Section 5.3 of UL 347 apply.9 Protective Devices9.1 Controllers shall be provided with the following protective features:a) The control-circuit transformer shall be provided with primary and secondary fuses.Instrument potential transformers shall be prov
21、ided with primary fuses.b) Medium voltage fuses in each phase to automatically interrupt overload and fault currents inthe load and the equipment itself.9.2 Controllers shall be arranged such that when the high-voltage isolating means is open all high-voltagefuses will be readily accessible, so that
22、 they may be replaced without a person touching any live part. Theelectrical arrangement of a single-throw switch shall be such that, when properly connected, fuseterminals will be dead when the switch contacts are open.9.3 If the design of a controller is such that a low-voltage control circuit fus
23、e is accessible with the controltransformer energized, a warning marking shall be provided in the vicinity of the fuseholder.MAY 22, 2014UL 347C6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL9.4 When provided, an open-phase protective device
24、 shall operate upon the loss of power in oneconductor of a polyphase circuit, to cause and maintain the interruption of power in all of the circuit inaccordance with 32.2.9.5 Solid state switching elements in the main circuit shall be provided with thermal sensing devices ineach pole that detect an
25、overtemperature and operate to de-energize the main circuit by de-energizingone or more magnetically operated devices.10 Isolating Means10.1 The isolating means requirements in Section 5.202 of UL 347 apply.10.2 Equipment shall be provided with an electromechanical contactor which opens the main cir
26、cuit whenthe controller is in the off or stopped position.11 Interlocking11.1 The interlocking requirements in Section 5.11 of UL 347 apply.12 Automatic Restarting12.1 Fault interrupting devices, in controllers shall not automatically reclose after a fault interrupting(short-circuit) operation.12.2
27、Other than as noted in 12.3, an overload circuit, undervoltage device, or any other protective orsensing device that is intended to interrupt the continuous operation of the heater shall not automaticallyreset after tripping.12.3 An overload circuit, undervoltage device, and the like, may automatica
28、lly reset after tripping providedthat:a) A manual operation is required to close the circuit, orb) The controller is marked in accordance with 37.1(x).12.4 If the wiring diagram of a controller indicates that one side of the control circuit is, or may begrounded, the control circuit shall be so arra
29、nged that an unintentional ground in the remote control devicecircuit will not cause the controller to energize the load.MAY 22, 2014 UL 347C 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL13 Wiring and Connections13.1 The internal wiring re
30、quirements in Section 5.205 of UL 347 apply.13.2 Other than as noted in 13.3, equipment operating above 7200 V, instruments, meters, relays,secondary control devices, and their wiring shall be isolated by grounded metal barriers from the primarycircuit elements, with the exception of short lengths o
31、f wire such as at instrument transformer terminalsand secondary disconnecting devices.13.3 The requirements of 13.2 do not apply to printed circuit board assemblies, such as gate driveboards, which are located in the same high voltage compartment as the devices they control, and areelectrically conn
32、ected to solid state switching devices operating at or near line potential. Such devicesshall be electrically isolated from low voltage devices and wiring through the use of isolation transformersor fiber optic signaling.13.4 Terminals and connections for wiring shall comply with Section 5.206 of UL
33、 347.13.5 Bus bar connections shall comply with Section 5.207 of UL 347.13.6 Connector and grounding kits shall comply with Section 5.208 of UL 347.13.7 Wire bending space shall comply with Section 5.210 of UL 347.14 Insulating Materials14.1 Insulating materials shall comply with Section 5.209 of UL
34、 347.15 Field Installed Accessories15.1 Field installed accessories shall comply with Section 5.211 of UL 347.16 Spacings16.1 General16.1.1 The electrical through-air and over surface spacings shall be not less than those indicated in Table16.1.16.1.2 The spacings indicated for control circuits in T
35、able 16.1 are applicable between live parts of controlcircuit components and grounded metal and to live parts of other control circuit components.16.1.3 The spacings in a component device - such as a snapswitch, lampholder, and the like - suppliedas part of industrial control equipment, other than i
36、n motor circuits, shall not be less than the minimumspacings required for the component device or the spacings indicated in Table 16.1, whichever aresmaller.MAY 22, 2014UL 347C8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 16.1Spacings
37、Group Voltagerating, volts(rms ordirect-current)a,bMinimum clearance and creepage distanceTo other than enclosure wallscTo walls of metalenclosured,eClearance through Creepage along Clearancethrough air oroilCreepagealong surfaceair or oilAir Oil Air OilInches mm Inches mm Inches mm Inches mm Inches
38、 mm Inches mmLine VoltageCircuits2500 maxf1.000 25.40 0.750 19.05 2.000 50.80 1.000 25.40 2.000 50.80 3.000 76.207200 maxf2.000 50.80 1.500 38.10 3.500 88.90 2.000 50.80 3.000 76.20 4.000 101.6015 kV maxf2.000 50.80 1.500 38.10 3.500 88.90 2.000 50.80 3.000 76.20 4.000 101.60SeriesConnectedComponent
39、sg601 1000 0.550 13.95 0.450 11.43 0.850 21.59 0.625 15.87 0.800 20.32 1.000 25.401001 1500 0.700 17.78 0.600 15.24 1.200 30.48 0.700 17.78 1.200 30.48 1.650 41.90ControlCircuitsh0 50 0.125 3.17 0.125 3.17 0.125 3.17 0.125 3.17 0.500 12.70 0.500 12.7051 150 0.125 3.17 0.125 3.17 0.250 6.35 0.250 6.3
40、5 0.500 12.70 0.500 12.70151 300 0.250 6.35 0.250 6.35 0.375 9.52 0.375 9.52 0.500 12.70 0.500 12.70301 600 0.375 9.52 0.375 9.52 0.500 12.70 0.500 12.70 0.500 12.70 0.500 12.70aWhere the repetitive peak voltage on which the device used is more than 1.5 times the rms volts, the peak voltage shall be
41、divided by 2 to obtain an equivalent rms rating in volts.bFor grounded power systems, such as 3-phase, 4-wire systems, the clearance and creepage distances to ground shall begoverned by the voltage to ground.cThe spacing between screw type wiring terminals of opposite polarity shall be not less than
42、 0.250 inch (6.35 mm) if theterminals are in the same plane.dFor the purpose of this requirement, a metal piece attached to the enclosure is considered to be a part of the enclosure ifdeformation of the enclosure is likely to reduce clearance and creepage distances between the metal piece and uninsu
43、lated liveparts.eFor subassembly enclosures where clearance and creepage distances are rigidly maintained, and when mounted insideanother enclosure, the distances for to other than enclosure walls may be used instead of to walls of metal enclosure.fBecause of the effect of configuration, spacings in
44、 excess of those indicated may be required to meet the performancerequirements of this standard.gIn a series circuit, the spacings between resistor terminals, transformer taps, and the like are to be based on the normaloperating voltage existing between such parts.hWhere line voltage is connected to
45、 control circuits, the line voltage spacings shall apply.iIn circuits operating above 7200 V, the minimum spacings are shown, but spacings in excess of those indicated will normallybe required in order to meet the performance requirements of this standard.16.1.4 The spacings at a field-wiring termin
46、al are to be measured with wire of the appropriate sizeconnected to the terminal as in actual service. The connected wire shall be the next larger size than wouldbe required for the rating except that the required wire size shall be used if:a) The terminal will not accept the larger size, orb) The d
47、evice is marked to restrict the use of oversized conductors.MAY 22, 2014 UL 347C 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL16.1.5 The spacings at fuses and fuseholders, measured with the fuses in place, are to be based on theuse of fuse
48、s having maximum standard dimensions and are not to be less than the spacings indicated inTable 16.1. Where the fuseholder construction permits a fuse to be partially inserted and remain in thatposition, spacings shall be measured with the fuse in the partially inserted position as well as in the fu
49、llyinserted position.16.1.6 The type and thickness of crossover-lead insulation and insulation under coil terminals secured tothe coil winding may be less than that specified in 16.2.1 16.2.6 provided that for thicknesses less than0.013 inch (0.33 mm) the coil is capable of withstanding a dielectric voltage-withstand test between coilend leads after breaking the inner coil lead where it enters the layer, or an equivalent-opposite polaritytest. The application of the test potential is to be in accordance with Dielectric Voltage - Withstand Test,Section 23.16.
