Conformity Magazine - March 2009 - (Page 27) In standards, the AC testing of equipment only used with a specified protector is done in three ways: • Tested at 600 V rms with the primary protector in place for second-level tests (Table 4-10), and then with the AC source voltage reduced to the protector maximum AC letthrough – GR-1089-CORE • Tested at 600 V rms with the protector in place – UL 1459 for UL 497 primary or UL 497A secondary protectors, and UL 60950-1 for UL 497A secondary protectors • Tested with a generator voltage equal to the primary protector maximum AC let-through voltage and generator short-circuit currents equal to 600 V generator values – UL 60950-1, UL 497 primary protectors The first edition of UL 2564 simplifies these three conditions to one. The component is tested with an AC generator voltage equal to the primary protector Group voltage (see Table 2) and generator short-circuit currents set to 600 V generator values. Table 5 lists AC sources needed for the Subject 2564. Lightning Impulse Testing Lightning surge testing is in two parts, traditional testing and primary-secondary protector coordination testing. The range of surge generators used is 10, 1.2/50-8/20, 160, 250, 60, 10/700 (9/720), and 1000. Applications with defined or integrated primary protection are covered by adjustment of the maximum open-circuit voltage. To maximize component stress in the GR-1089-CORE 250 and 1000 primary-secondary protector coordination testing, the secondary protector is assumed to be a switching type, making the test circuit simply the component and primary protector connected in parallel. The component shall be mounted as described in the earlier Power Fault Testing section. Traditional Lightning Impulse Testing The GR-1089-CORE document has both power fault and lightning testing. The UL documents have power fault testing with little or no lightning testing. UL verified equipment (templates E through I) would typically be compliant to the telephone line (lightning) surges of TIA-968. There are two types of TIA-968 surge, Type A (transverse 560, >800 V, >100 A and longitudinal 160, >1500 V, 2x>200 A), and Type B (longitudinal 9/720, >1500 V–5/320, 1x>37.5 A). UL 2564 assumes the overcurrent protector components will withstand both Type A and Type B surges. Each surge is applied five times in each polarity (TIA-968 only requires each surge to be applied once in each polarity). Templates C and D are tested with the single pair port condition. If the port has three or more pairs, only the 1.2/50-8/20 generator should be used at reduced current level, as described in GR-1089-CORE, Issue 4, Table 4-6. Table 6 lists the surge generators needed for traditional impulse testing. Primary-Secondary Protector Coordination Testing Only the outside line ports of GR-1089-CORE (Issue 4) equipment (Templates A and B) have to pass 1000 longitudinal and transverse coordination. Outside Plant Port Type 5 and Customer Premises Port Type 3 in severe environments can be tested with the higher current level longitudinal coordination test using a 250 impulse generator. Coordination occurs when the component either develops sufficient voltage to operate the specified category of primary protector, or conducts the maximum specified coordination current ( 1000, <100 A and optionally 250, >500 A). The component must withstand 10 repetitions marCh 2009 Conformity 27 http://www.spira-emi.com http://www.spira-emi.com
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