A Comparison of UL 60950 and GR 1089 CORE Safety Requirements.doc
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1、A Comparison of UL 60950 and GR-1089-CORE Safety RequirementsDave LorussoLorusso Technologies, LLC 512-695-5871 2003 All Rights ReservedPresentation Overview GR-1089-CORE Electrical Safety UL 60950 Electrical Safety Key Differences Wrap UpIEEE EMC Symposium - August, 2003 UL 60950 and GR-1089-CORE S
2、afety Requirements GR-1089-CORE Electrical Safety Intended to protect “Persons”from harm, by: Restricting access to various voltage levels Limiting voltages and currents that are intentionally applied to communications circuits and to energized parts of network equipment Controlling leakage currents
3、 that may be conducted from exposed surfaces of the equipment Imposing an overall power limitation on sources that may be applied to communications wiringIEEE EMC Symposium - August, 2003 UL 60950 and GR-1089-CORE Safety Requirements GR-1089-CORE Electrical Safety “Persons” are: General Public Unfam
4、iliar with electrical hazards Not intended to have access to energized conductors or parts May interface with network equipment on customer premises (NID, ONU, Cabinets) Employees (work for phone company Administrative) Might interface with network equipment while performing administrative or servic
5、e functions Craftpersons (work for phone company Service ) Trained to work with powered communication circuits Access energized parts of network equipmentIEEE EMC Symposium - August, 2003 UL 60950 and GR-1089-CORE Safety Requirements GR-1089-CORE Electrical Safety Restricting Access Three levels of
6、diminishing accessibility determined by the use of the Accessibility ProbeTest Finger or Test Finger is from UL 60950, figure 2A modified by extending Part 3 by 10 mm; must use the 5.08 cm disk; preferable method and the only method allowed after January 1, 2005 Can use Accessibility Probe of UL 145
7、9 if modified with the 5.08 cm disk; cannot use after January 1, 2005IEEE EMC Symposium - August, 2003 UL 60950 and GR-1089-CORE Safety Requirements GR-1089-CORE Electrical SafetyPart 3IEEE EMC Symposium - August, 2003 UL 60950 and GR-1089-CORE Safety Requirements GR-1089-CORE Electrical SafetyIEEE
8、EMC Symposium - August, 2003 UL 60950 and GR-1089-CORE Safety Requirements GR-1089-CORE Electrical Safety Restricting Access Three levels of diminishing accessibility Exposed暴露 If source can be contacted with Finger or Probe where dimension “A” is 3.5 cm Restricted Access限制接近 If source is not Expose
9、d, but may be contacted with Finger or Probe where dimension “A” is 9.0 cm Inaccessible 难以接近 If source cannot be contacted with Finger or Probe where dimension “A” is 9.0 cmIEEE EMC Symposium - August, 2003 UL 60950 and GR-1089-CORE Safety Requirements GR-1089-CORE Electrical Safety Restricting Acce
10、ssVoltage ClassA1A2A3General PublicRestricted AccessInaccessibleInaccessibleEmployeesExposedRestricted AccessInaccessibleCraftpersonsExposedExposedRestricted Access (Exceptions)IEEE EMC Symposium - August, 2003 UL 60950 and GR-1089-CORE Safety Requirements GR-1089-CORE Electrical Safety Limiting Vol
11、tages and Currents Voltage and Current Classification Voltage Source is classified as Continuous or Duration-Limited Continuous Source is defined as One that is present for longer than 5 seconds Duration-Limited Source falls into 2 categories Interrupted/Tripped Duration from 0.01 to 5 S (Ringing) T
12、ransient Duration of less than 0.01 S; Peak Voltage may exceed 200 V peak ; Source cannot deliver more than 2 joules into 500 ohm resistive load during the 0.01 S transient levelIEEE EMC Symposium - August, 2003 UL 60950 and GR-1089-CORE Safety Requirements GR-1089-CORE Electrical Safety Limiting Vo
13、ltages and Currents Continuous Voltage and Current Limits Apply between each terminal and ground with all other terminals connected as in normal service Also apply between each terminal and ground with all other terminals open circuited For paired-conductor sources, the limits also shall apply with
14、all other terminals individually grounded Divided into Classes A1, A2, and A3 (each may be contacted barehanded), Class AB, Class B, and Class C NOTE sources standardized by industry with voltages and currents known to be below Class A1 do not need to be tested (RS-232, V.35, 10BaseT, 100BaseT, X.25
15、, DSX-1, DS3, USB)IEEE EMC Symposium - August, 2003 UL 60950 and GR-1089-CORE Safety Requirements GR-1089-CORE Electrical Safety Limiting Voltages and Currents Class A1 Vdcw.r.t. ground 30 V (any current)(30 Vdc 200, if I 0.15 mAdc) V peakw.r.t. ground 14.1 V peak(any current)(14.1 V peak 200, if I
16、0.15 mApeak)IEEE EMC Symposium - August, 2003 UL 60950 and GR-1089-CORE Safety Requirements GR-1089-CORE Electrical Safety Limiting Voltages and Currents Class A2 Vdcw.r.t. ground 80 V (any current)(80 Vdc 200, if I 5.0 mAdc) Vacw.r.t. ground 42.4 V peak(any current)(42.4 V peak 200, if I 1.0 mApeak
17、)IEEE EMC Symposium - August, 2003 UL 60950 and GR-1089-CORE Safety Requirements GR-1089-CORE Electrical Safety Limiting Voltages and Currents Class A3 Vdcw.r.t. ground 140 V (any current)(140 Vdc 200, if I 10.0 mAdc) VACw.r.t. ground 70 V peak(any current)(70 V peak 200, if I 3.0 mApeak)IEEE EMC Sy
18、mposium - August, 2003 UL 60950 and GR-1089-CORE Safety Requirements GR-1089-CORE Electrical Safety Limiting Voltages and Currents Class AB Exceed Class A3 limits V w.r.t. ground 90 Vdcor 90 V ac rms , I 15 A Power levels up to 1350 VA are permitted Intended for OSP powering applications over COAX C
19、lass B Exceed Class A3 limits; 600 VdcV ac rms; or 1000 Vacbetween metal parts Class C Exceed Class B limits; beyond the scope of standardIEEE EMC Symposium - August, 2003 UL 60950 and GR-1089-CORE Safety Requirements GR-1089-CORE Electrical Safety Limiting Voltages and Currents Duration-Limited Sou
20、rce Interrupted/Tripped Sources Apply to ringing and other sources used for network control or testing Normally present over a small portion of a day (10%) Can be considered as Class A2 if the conditions of R7-17, R7-18, and R7-19 are metIEEE EMC Symposium - August, 2003 UL 60950 and GR-1089-CORE Sa
21、fety Requirements GR-1089-CORE Electrical Safety Limiting Voltages and CurrentsInterrupted/Tripped Sources (continued) considered as Class A2 if:R7-17 - Sources shall be 300 Vpeak-to-peakand 200 V peak-to-groundas measured across one megohmR7-18 - Voltage interrupted to create idle intervals of at l
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