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1、FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION Subject 1449 July 7, 2006 SUMMARY OF TOPICS The following topic is being recirculated: 1. Revisions To The Third Edition As A Result Of Comment Resolution STP BALLOTS AND ALL COMMENTS DUE: August 21, 2006 For your convenience in review, p
2、roposed additions to the previously proposed requirements are shown underlined and proposed deletions are shown lined-out. 1. Revisions To The Third Edition As A Result Of Comment Resolution Responses to comments have been posted within the Proposal Review Work Area. RATIONALE The proposed third edi
3、tion of UL 1449 dated December 2, 2005 achieved consensus. To address the comments generated during the review, a comment resolution STP meeting was held. The following proposed revisions to the third edition are as a result of suggested changes that were agreed to during the STP 1449 comment resolu
4、tion meeting held on May 24 including SPDs located at the branch panel. Type 3 Point of utilization SPDs, installed at a minimum conductor length of 10 meters (30 feet) from the electrical service panel to the point of utilization, for example cord connected, direct plug-in, receptacle type and SPDs
5、 installed at the utilization equipment being protected. See marking in 65.2. The distance (10 meters) is exclusive of conductors provided with or used to attach SPDs. Type 4 Component SPDs, including discrete components as well as component assemblies. 1.11 These requirements do not evaluate the ef
6、fect of SPDs on connected loads, the effect of SPDs on harmonic distortion of the supply voltage, the degree of attenuation provided by SPDs, nor the adequacy of the voltage protection level rating of SPDs to protect specifi c connected equipment from upset or damage. 1.13 An SPD intended to serve a
7、s an outlet cover plate or outlet box hood shall comply with the requirement for faceplates in the Standard for Cover Plates for Flush Mounted Wiring Devices, UL 514D. 3.5 COMBINATION WAVE (Also called combination surge) A surge delivered by a generator which has the inherent capability of applying
8、a 1.2/50s ms voltage wave across an open circuit, and delivering an 8/20 s ms current wave into a short circuit. The exact wave that is delivered is determined by the generators and instantaneous fi ctive impedance to which the combination surge is applied. 3.10 ELECTROMAGNETIC INTERFERENCE FILTER A
9、 fi lter device intended to attenuate unwanted radio-frequency signals (such as noise or interference) generated from electromagnetic sources. EMI fi lters consist of capacitors and inductors used alone or in combination with each other and may be provided with resistors. 3.11 EQUIPMENT UNDER TEST (
10、EUT) Refers to the SPD device being tested. 3.15 MAIN SERVICE EQUIPMENTOVERCURRENT DEVICE PROTECTION The fi rst overcurrent protection device between the distribution service transformer secondary and the service entrance. 3.26 PHASE ANGLE The point on the ac power sine wave, expressed in terms of e
11、lectrical degrees between 0 and 360, at which the transient surge is applied measured from the point at which the sine wave crosses the zero axis with a positive slope. 3.36 SURGE PROTECTIVE DEVICE (SPD) A device composed of at least one non-linear component and intended for limiting surge voltages
12、on equipment by diverting or limiting surge current and is capable of repeating these functions as specifi ed. SPDs was were previously known as Transient Voltage Surge Suppressors or secondary surge arresters. 3.39 VOLTAGE PROTECTION LEVEL RATING (VPL) (VPR) A rating selected from a list of preferr
13、ed values as given in Table 64.1 and assigned to each mode of protection. The value of VPL VPR is determined as the nearest highest value taken from Table 64.1 to the measured limiting voltage determined during the transient-voltage surge suppression test using the combination wave generator at a se
14、tting of 6kV, 3kA 8/20. 6.4 An SPD with a maximum continuous operating voltage (MCOV) greater than the rated system operating voltage shall be tested and comply with all construction and performance requirements at the MCOV. JULY 7, 2006SUBJECT 1449-2- Copyright Underwriters Laboratories Inc. Provid
15、ed by IHS under license with ULLicensee=North Carolina State University/5618801100 Not for Resale, 10/16/2006 21:31:22 MDTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION 12.3 A thermal cutoff device provided in a pe
16、rmanently connected SPD, a cord connected SPD or a direct plug-in SPD and not connected in series with the load, shall comply with the requirements in the Standard for Thermal Cutoffs for Use in Electrical Appliances and Components, UL 1020 Thermal-Links - Requirements and Application Guide, UL 6069
17、1. 12.4 A thermal cutoff device provided in a cord connected SPD or a direct plug-in SPD and connected in series with the load, shall be capable of clearing a fault current of not less than that indicated in Table 12.1 and shall comply with the requirements in the Standard for Thermal Cutoffs for Us
18、e in Electrical Appliances and Components, UL 1020 Thermal-Links - Requirements and Application Guide, UL 60691. Table 12.1 Available fault currentafrom source of supply Permanently connected devicesa bCord connected or direct plug-in devicesa b Rating, A Available fault current, amperesb c Rating v
19、olts Rating, volts times amperes Available fault current, amperes 100 A or less5,000 250 ac or less 1175 or less200 101 400 A10,0001176 to 19201000 Over 400 A25,0001921 to 40802000 4081 to 96003500 More than 96005000 More than 250 ac 1920 or less1000 More than 19205000 a Available fault current eith
20、er at the point of application of the SPD or equal to or greater than the rating of the panel in which it is installed. a b For one-port SPD, the rating shall be based on the ampere rating of the circuit that the SPD is intended to be connected to, in accordance with the manufacturers instructions.
21、See 64.1. b c Higher fault current ratings, as detailed in Table 65.2 are able to be used. 12.9 A supplementary protection device shall not open during the Temperature Test, Section 37 or the Measured Limiting Voltage Test Surge Testing, Section 38. 14.1.1.6 For one port SPD Types 1 and 2, the pigta
22、il lead shall not be smaller than 14 AWG (2.1 mm2) copper or 12 AWG (3.3 mm2 ) aluminium. An integral pigtail lead intended to be connected in the fi eld to a power supply circuit conductor shall not be smaller than 18 AWG (0.82 mm2) and shall not be shorter than 152 mm (6 inches), when measured fro
23、m the point of exit from the conduit connector. Insulation on such a lead shall be: a) At least 0.8 mm (1/32 inch) thick thermoplastic; or b) At least 0.4 mm (1/64 inch) thick rubber plus a braid cover for 300 V or less applications; or c) At least 0.8 mm (1/32 inch) thick rubber plus a braid cover
24、for applications between 301 and 600 V. Exception:A Type 4 SPD with an integral pigtail lead intended to be connected to a power supply circuit conductor shall not be smaller than 18 AWG (0.82 mm2) and shall not be shorter than 152 mm (6 inches), when measured from the point of exit from the conduit
25、 connector. Insulation on such a lead shall be: a) At least 0.8 mm (1/32 inch) thick thermoplastic; or JULY 7, 2006SUBJECT 1449-3- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=North Carolina State University/5618801100 Not for Resale, 10/16/2006 21:31:22 MDT
26、No reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION b) At least 0.4 mm (1/64 inch) thick rubber plus a braid cover for 300 V or less applications; or c) At least 0.8 mm (1/32 inch) thick rubber plus a braid cover for ap
27、plications between 301 and 600 V. Table 18.1 Minimum spacings Spacings, in mm (inches) Between any uninsulated live part and an uninsulated live part of opposite polarity, and uninsulated grounded dead metal part other than the enclosure, or exposed dead metal part that is isolated (insulated)e,f Be
28、tween any uninsulated live part and the walls of a metal enclosure, including fi ttings for conduit or armored cableb,c,e,f ProductPotential involved in volts-RMS (peak) Through air or oilOver surfaceShortest distance Cord connected and direct plug-in types 0 50 (70.7 or less)1.2 (3/64)1.2 (3/64)1.2
29、 (3/64) 51 125 over 70.7 176.8) 1.6 (1/16)1.6 (1/16)6.4 (1/4) 126 250 (over 176.8 353.5) 2.4 (3/32)2.4 (3/32)6.4 (1/4) 251 600 (oer 353.5 848.4) 9/5d(3/8)d12.7d(1/2)d12.7 (1/2) Permanently-connected types 0 150 (212.1 or less)3.2a(1/8)a6.4 (1/4)12.7 (1/2) 151 300 (over 212.1 424.3) 6.4 (1/4)9.5 (3/8
30、)12.7 (1/2) 301 600 (over 424.3 848.5) 9.5 (3/8)12.7 (1/2)12.7 (1/2) 601 1000 (849.9 1414.2) 14 (.55)21.6 (.85)25.4 (1) a The spacing between fi eld wiring terminals of opposite polarity and between a wiring terminal and a grounded or exposed dead metal part shall not be less than 6.4 mm (1/4 inch)
31、if short circuiting or grounding of such terminals may result from projecting strands of wire. b For the purpose of this requirement, a metal piece attached to the enclosure is considered to be a part of the enclosure if deformation of the enclosure is likely to reduce the spacing between the metal
32、piece and uninsulated live parts. c The spacing to a metal enclosure does not apply to the housing or frame of a device intended for installation with an end product enclosure. d These spacings apply to the sum of the spacings involved whenever an isolated dead metal part is interposed. e Reduced sp
33、acings may be acceptable on a printed wiring board provided with a conformal coating that complies with the Standard for Polymeric Materials Industrial Laminates, Filament Wound Tubing, Vulcanized Fibre, and Materials Used in Printed Wiring Boards, UL 746E Polymeric Materials Use in Electrical Equip
34、ment Evaluations, UL 746C; and are judged based on the tests performed. f A printed wiring board intended to be completely encapsulated in an acceptable potting compound or epoxy shall not have any spacing less than 0.8 mm (1/32 inch). 22.3 A solid-state electronic circuit that operates and is relie
35、d upon for safe operation of the device during the Leakage Current Test, Section 35, the Measured Limiting Voltage Test Surge Testing, Section 38, the Overvoltage Operational Voltage Test, Section 39, or the Abnormal Overvoltage Test Current Testing, Section 40, shall be investigated and comply with
36、 the requirements of Standard for Tests for Safety-Related Controls Employing Solid-State Devices, UL 991. JULY 7, 2006SUBJECT 1449-4- Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=North Carolina State University/5618801100 Not for Resale, 10/16/2006 21:31:22
37、 MDTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION Exception:A solid-state electronic circuit that operates during the Leakage Current Test, Section 35, the Measured Limiting Voltage TestSurge Testing, Section 38,
38、the Overvoltage TestOperational Voltage Test, Section 39, or the Abnormal Overvoltage Test Current Test, Section 40, is not required to be investigated to UL 991 when the SPD is tested: a) With the circuit functioning as intended; b) With the circuit open-circuited; and c) With the circuit short-cir
39、cuited during the Leakage Current Test, the Measured Limiting Voltage Test Surge Testing, the Surge Current Test, the Overvoltage Test Operational Voltage Test, or the Abnormal Overvoltage TestCurrent Test. 30 SPDs Intended for Use on Ungrounded Systems, Impedance Grounded Systems, or Corner Grounde
40、d Delta Systems 30.1 SPDs for use on ungrounded systems, impedance grounded systems, or corner grounded delta systems shall have surge protective elements that are connected from line to ground rated for maximum line to line voltage. 33 Interchangeability of Metal Oxide Varistors (MOVs) 33.1 The fol
41、lowing requirements shall be applied when substituting MOVs within SPDs: a) Interchangeability of MOVs shall only be applicable to Type 1, Type 2, or a Type 4 SPD with integral overcurrent protection. b) The SPD shall be provided with a metal enclosure or a plastic enclosure that complies with fl am
42、mability 5 inch (127 mm) fl ame test in the Standard for Polymeric Materials-Use in Electrical Equipmemt Evaluations, UL 746C. A minimum 5 mm spacing shall be maintained from the MOV case to the inside of the plastic enclosure. This spacing requirement may be satisfi ed by a barrier or partition, be
43、tween the MOV and the plastic enclosure, that is a part of the SPD and provides protection from excessive heat. c) Replacement MOV shall have the same orientation and location as the original MOV. d) Replacement MOV shall comply with the requirements in this standard. e) Replacement MOV shall have t
44、he same MCOV as the original MOV with a maximum tolerance of 2 percent. f) Replacement MOV disk diameter shall be equal to the original MOV or the geometric area shall be equal, i.e. when replacing a round MOV with a square one. g) Replacement MOV shall have the following test specifi cation data eq
45、uivalent to the original MOV: 1) Peak Surge Current i) Replacement MOV shall withstand, without evidence of fi re, an 8/20 single peak surge current equal to or greater than the original MOV surge current level. JULY 7, 2006SUBJECT 1449-5- Copyright Underwriters Laboratories Inc. Provided by IHS und
46、er license with ULLicensee=North Carolina State University/5618801100 Not for Resale, 10/16/2006 21:31:22 MDTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION 2) Measured Limiting Voltage (MLV) i) Replacement MOV shal
47、l be tested, at 100A, 8/20, surge current level or an equivalent (to the original MOV) surge current level and the MLV shall be equal to, but not greater than 10 percent, of the original MOV. 3) Dielectric Withstand i) Replacement MOV shall comply with the Dielectric Withstand Test in this standard.
48、 4) Leakage Current i) Replacement MOV leakage current at rated MCOV shall be equal to the original MOV leakage current with a tolerance of 10 percent. h) The replacement MOV coating shall be equivalent to the original MOV coating. (CURRENT SECTION 34 DELETED) 34 General 34.1 Unless otherwise specif
49、i ed, tests performed on a SPD shall be conducted under the following standard test conditions: Relative Humidity:Less than 85 percent Altitude or Pressure:Less than 2000 m (6562 ft) or pressure of 80 106 kPa Ambient Temperature:25 5C AC Operating Voltage:Nominal System Voltage or manufacturers normal operating voltage rating, whichever is greater