1、1-24 Class 2 Power Units -UL 1310 (5th Edition) (Dated May 3, 2005, Last Revise Date Jan. 31, 2006) -CAN/CSA-C22.2 No. 223-M91 (2nd Edition) (Dated June 1991) Agenda(大綱) Scope (范围) Class 2 Definition (Class 2定义) Key Construction Requirements (结构要求重点) Enclosure/Protective Devices/Coil Insulation/Inpu
2、t Connections/Output Connections /Accessibility of Live Parts/Separation of Circuits/Grounding/Spacing (外壳/保护装置/变压器绝缘/输入连结/输出连结/带电体可接触性 /线路隔离/间距) Key Performance Requirements (测试要求重点) Electrical Tests (电气测试) Mechanical Tests (机构测试) Caution Marking and is not greater 30 V rms and 42.4 V peak; For DC
3、Systems - If the product exceeds the 30 V for continuous dc The product shall be marked as below: US “Class 2 not wet,” “Class 3 wet” Canada “Class 2 not wet,” “Class 1 wet” Max. O/P current for inherently limited units (先天限制的) (30.1) Max. nameplate ratings Circuit voltage (Vmax) a,b ac or dc Volts
4、V-A Amperes Max. o/p current (I max)c, amperes 0 20 Over 20 to 30 Over 30 to 60, dc only 5.0 X V max 100 100 5.0 100/Vmax 100/Vmax 8.0 8.0 150/Vmax a V max : Maximum output voltage regardless of load with rated input voltage applied. b Voltage ranges shown are for sinusoidal alternating current and
5、continuous direct current. For nonsinusoidal alternating current, maximum voltage shall not be greater than 42.4 volts peak. For direct current interrupted at a rate of 10 200 hertz, maximum voltage shall not be greater than 24.8 volts. c I max is maximum output current regardless of load. The maxim
6、um output volt-amperes shall not be more than 100 volt-amperes (最大输出不得超过 100VA) Max. O/P current and V A for not inherently limited units (非先天限制的) (Cl30.2) 3-24 Max. nameplate ratings Circuit voltage (Vmax) a,b ac or dc Volts V-A Amperes Max. o/p current (I max)c, amperes Max. o/p V A (V A max)d Max
7、. overcurrent protection rating, A 0 20 Over 20 to 30 Over 30 to 60, dc only 5.0 X Vmax 100 100 5.0 100/Vmax 100/Vmax 1000/Vmax 1000/Vmax 1000/Vmax 250e 250 250 5.0 100/Vmax 100/Vmax a V max is the maximum output voltage regardless of load with rated input voltage applied. b Voltage ranges shown are
8、 for sinusoidal alternating current and continuous direct current. For nonsinusoidal alternating current, maximum voltage shall be greater than 42.4 volts peak. For direct current interrupted at a rate of 10 200 hertz, maximum voltage shall not be greater than 24.8 volts. c I max is maximum ampere o
9、utput regardless of load after operation as specified in 30.2.1. d V A max is maximum volt-ampere output regardless of load after operation as specified in 30.2.1. e Maximum volt-amperes is 350 if maximum circuit voltage is 15 or less. Construction (結構) Mechanical Assembly-Direct Plug-In (机构组立-插墙式)
10、(Cl7.11) 4-24 Mechanical Assembly-Direct Plug-In (机构组立-插墙式)(7.16) Determination of perimeter of units with rounded edges A = 5.1 mm for UL (Marking for Mounting(固定件)Tab) A = 8.0 mm for CUL (No Mounting Tab) If a mounting tab be provided, the following conditions shall be met: a) Use on a or 15-amper
11、e, 125- 250-volt receptacle (NEMA 1-15R or 5-15R or 6-15 R); b) A screw No. 6 mounting screw (3.5 mm major diameter, 32 threads/inch) is provided and constructed to secure to a duplex (双方的) receptacle that has a center screw; c) For a unit without a grounding pin, the mounting tab is constructed to
12、be mounted to both grounding and non-grounding receptacles; and d) Marked “CAUTION” and the following or the equivalent: 1) “Risk of Electric Shock Disconnect power to the receptacle before installing or removing the unit. When removing receptacle cover screw, cover may fall across plug pins or rece
13、ptacle may become displaced;” 2) “Use only with duplex receptacle having center screw;” and 3) “Secure unit in place by receptacle cover screw” Metal Enclosure (金属外壳 ) Indoor use: A sheet metal thickness not less than that in Table 8.1. The thickness of sheet metal other than steel or aluminum shall
14、 not be less that than in Table 8.1 for uncoated steel (8.4) Iron and steel parts shall be protected against corrosion (抗蚀)by galvanizing (镀锌), plating (电镀), enameling (上釉), or other equivalent means if the corrosion (侵蚀)of such unprotected parts results in a risk of fire, electric shock, or injury
15、to persons (9.1) 5-24 Outdoor use: A type 3R, 3S, or 4X enclosure evaluated with UL 50 (CCN: CYIV or BGUZ), is not required to be subjected to the Rain Test (56.1) A metallic enclosure shall be protected against corrosion (57.5) Copper, bronze(青铜), and brass(黄铜) containing no less than 80 percent co
16、pper, or stainless steel may be used without additional protection against corrosion (57.6) Enclosure (塑料外壳) Indoor use: UL: Flammability (燃烧等级 ):Min. V-2 (UL 94) CUL: Flammability: Min. V-1 (UL 94) Resistance to arcing properties: UL 746C Moisture absorptive properties Outdoor use: A type 3R, 3S, o
17、r 4X enclosure evaluated with UL 50 (CCN: CYIV or BGUZ), is not required to be subjected to the Rain Test An enclosure of a unit shall be constructed to reduce the risk of electric shock due to weather exposure and shall prevent live parts, electrical components, or wiring (not identified (鉴别)for us
18、e while in contact with water) from becoming wet 6-24 Protective Devices (保护装置) The protective device may be located in either the primary or secondary circuit (可在初级或次级线路 ) Type of protective device: Thermostat, Thermal Cutoff, Positive Temperature Coeffecient (PTC) Resistor, Negative Temperature Co
19、effecient (NTC) Resistor, Fuse, Eutectic Material (双合金材料 ) An protective device shall not open when delivering its rated output (正常额定输出时, 保护装置不可做动) A protective device for a not inherently limiting Class 2 power unit shall not be of the automatic reclosing type(自动恢复式) and shall be rated with Table 3
20、0.2 and provided in secondary circuit Coil Insulation (变压器线圈绝缘) Any type or thickness of insulation may be used if the coil withstands the induced potential test (13.2.8.b) Tape used as insulation in lieu of (代替)spacing shall provide a continuous 1/32 inch (0.8 mm) minimum wide bent up edge against
21、the bobbin flanges (使用胶带当绝缘以抵押间距要求则须提供至少 0.8 mm宽的反折) (13.2.3) A flanged, bobbin-wound transformer shall be subjected to the output loading test continued for 15 days if the transformer has: The primary winding wound over the secondary winding or the secondary winding wound over the primary winding;
22、and The primary winding insulated from the secondary winding by a layer of insulating material other than coil form/bobbin The test is not required to be applied for 15 days if the following requirements are met: Multiple layered winding wire UL 746A, UL 746B, UL 746C Meet spacing requirement Table
23、24.1, Table 24.2 Alternate spacing UL 840 Triple insulated wiring Subject 2353 (OBJT2) 7-24 Input Connection (输入连结) Multiple Voltage Rated Power Unit (多输入电压电源适配器) Definition (定义): A power unit with a rated voltage range (such as 100 240 volts) or more than one discrete voltage rating (such as 120/24
24、0 volts) Intended for Use By Travellers (旅行者用电源适配器) Definition (定义): (14.1.4) A multiple voltage rated direct plug-in power unit with a 125 V , 15 A (parallel) input blade configuration, or a multiple voltage rated cord-connected power unit with a non-detachable power supply cord terminating in a 12
25、5 V , 15 A (parallel) blade plug Requirements for Intended for Use By Travellers (旅行者用电源适配器的要求): (14.1.4) a) The blade assembly shall be a 125 volt, 15 amp configuration(构造); b) The power unit shall employ a user adjustable (可调整的)voltage selector and comply with Switch Position Test, or be capable o
26、f operating at different voltages without user adjustment; c) The input voltage rating shall include nominal 120 volt; d) The power unit shall be marked as specified in 51.8; and e) The power unit shall be provided with instructions as specified in 54.4 A multiple voltage rated power unit intended f
27、or use by travelers shall be marked as follows with the following or equivalent: (51.8) a) “See instruction manual for use in countries other than the U.S.A.“ or b) “See instructions for input voltage conversion.” or c) “See instructions if the input plug does not fit the power outlet” Instructions
28、shall include (a) - (c) or the equivalent, as appropriate. The items shall be preceded by “IMPORTANT 8-24 SAFETY INSTRUCTIONS - SAVE THESE INSTRUCTIONS“ and “DANGER - TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, CAREFULLY FOLLOW THESE INSTRUCTIONS“ in letters of 1/8 inch (3.18 mm) high or in a read
29、ily visible contrasting text (54.4) a) “Be sure voltage selector is in correct voltage position before plugging in.“ The instructions shall also specify the procedures to follow for changing the voltage selector b) “For use in the U.S.A., the voltage selector switch must be placed in the 120 volt po
30、sition. For use in countries other than the U.S.A., the voltage selector may need to be placed in other than the 120 volt position. Confirm the voltage available at each country location before using the product“ c) “For connection to a supply not in the U.S.A., use an attachment plug adapter of the
31、 proper configuration for the power outlet, if needed.“ or “If the shape of the plug does not fit the power outlet, use an attachment plug adaptor of the proper configuration for the power outlet“ Direct Plug-in Units (插墙式) Indoor use: Blade assembly meet UL 1681, UL 1310 par. 7.16 and 7.17 A direct
32、 plug-in unit employs a manually operated line connected single-pole switch or a fuse with an accessible contact, it shall employ a polarized- or grounding-type blade assembly (如有手动电压选择开关或可 接触式保险丝, 则需是极性或有接地的blade) (14.1) A direct plug-in unit employs folding or retractable blades for the input conn
33、ectors, it shall comply with Direct Plug-in Security of Input Contacts Test (Blade Endurance Test for 6000 cycles) (44.2) Outdoor use: Brass containing of blades no less than 80 percent copper (57.6) Cord Connected Units (桌上型 ) Indoor use: Table 14.1 and cord external length shall not be less than 6
34、 feet (1.8 m) and not smaller than No. 18 AWG (14.2.1 充电器的输出线需带有接头或是接头附在外壳上) For CUL, permanently attached cord terminating in a connector shall be provided Indoor use: Output Wiring: Shall be stranded conductors(绞线) having insulation not less than 0.013 inch (0.33 mm) thick, and permanently attache
35、d to the output circuit. The wiring shall extend at least 6 feet (1.8 m) outside the unit (15.2.1) For a cord-connected unit (桌上型 ) with a minimum 6 feet (1.8 m) power-supply cord, the output flexible cord (permanently attached to the power unit or provided in the form of a separate cord set) shall
36、be of any desirable length. The maximum combined length of the input and output cords shall not exceed 20 feet (6.1 m) (15.2.2) Outdoor use: Output Wiring: Shall be suitable for outdoor use, “W” rated, and sunlight (UV) resistant (抗紫外线) as applicable to outdoor cords (60.1) For CUL, shall be of the
37、type in Table 11 of the Canadian Electrical Code, Part I, and shall at least of the type SPT-2, PXWT or CXWT and suitable for wet locations Output Wiring: Strain Relief Bushing (套管)be suitable for outdoor use and sunlight (UV) resistant (抗紫外线) (QMFZ2) with f2 code or (QMTT2) Output terminals: A term
38、inal plate shall be not less than 0.030 inch (0.76 mm) thick, and shall provide not less than two full threads in the metal for the binding screw (15.3.1) (安上接线螺丝或螺栓的接线板应由黄铜或其它非铁金属，或镀钢制成，厚度不 少于0.030 吋 (0.76 毫米)，和在金属内应提供不少于两个完全的螺纹给接线螺丝使用。 A wire-binding screw shall not be smaller than No. 6 (3.5 mm d
39、iameter) and shall not have more than 32 threads per inch (25.4 mm) (15.3.2) A multi-output unit employing output terminals the output of which exceeds the current limit (inherently limited) with outputs interconnected shall be marked with “CAUTION” and “Risk of Fire. Use only Type SPT-2 or heavier
40、cord, minimum 18 A WG copper” (15.3.4 and 52.12) Output connectors: A unit with multiple outputs where interconnection exceeds Class 2 levels shall be provided with a polarized 10-24 connector (15.4.1) Output connectors mounted on the enclosure and intended for direct connection of accessories shall
41、 be polarized if the output is direct-current or if multiple outputs are provided (15.4.2) Connectors normally used with coaxial cable shall not be used (15.4.5) USB can be as output connector by output shall not be more than 5 V dc, 500 mA Clips (夹子, 回形针) shall not be used as output connector A bat
42、tery charger shall be provided with a means to inhibit backfeed of current (反聩电流 ) which results in a risk of fire or electric shock. The means of prevention shall protect each output and shall consist of any of the following: (15.4.3) a) A fuse, calibrated located in the output connector and rated
43、to correspond with the maximum overcurrent protection rating b) A diode or fixed impedance located in the output connector where it will limit backfeed current c) An overcurrent protector equivalent to (a) located in the output connector d) An output cord equivalent to that specified in Table 14.1 w
44、ith respect to insulating material and thickness Output connectors: Outdoor use Material of connector shall be QMFZ2 with f2 code (Ultraviolet Light Resistant)(抗紫外线) or QMTT2 suitable for outdoor use (Ultraviolet Light Resistant) (抗紫外线) Accessibility of Live Parts (带电体可接触性) Indoor use: Live parts ot
45、her than exposed (暴露的) wiring terminals: (16.2) (通常指内部电路 ) The test pin and articulate probe shall not contact: (16.2.1) a) A primary circuit; or b) Any live part with a voltage greater than the following with respect to ground or any other live part simultaneously accessible to the test pin or arti
46、culate probe 1) 42.4 V peak for sinusoidal or nonsinusoidal AC 2) 60 V for continuous DC The test pin and articulate probe are to be applied with a force not exceeding 1 pound (4.4 N) to determine whether the live parts are accessible (16.2.3) Outdoor use: The test pin and articulate probe shall not
47、 contact: (62.2) A primary circuit; or b) Any live part with a voltage greater than the following with respect to ground or any other live part simultaneously accessible to the test pin or articulate probe 1) 15 V for sinusoidal AC a) and 21.2 V peak for nonsinusoidal AC 2) 30 V for continuous DC Exposed wiring terminals: (16.3.2) Indoor use:
