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Appendix C: Electrical Specifications

Frequency

50, 60 Hz

Temperature range of circuit breaker

20°C to 55°C

Temperature trip of PC board

85°C

Relative humidity (noncondensing)

0 to 85%

Control voltage consumption

6 watts

Control voltage

24 Vdc ±10%

Alarm Relays 1 and 2 (Resistive Load)

0.5A

@ 230 Vac

@ 120 Vac

@ 48 Vdc

0.35A

@ 125 Vdc

Operating Manual for Series NRX

Digitrip Trip Units 1150 / 1150i

Effective September 2013

Instructional Leaflet IL01301064E

EATON

www.eaton.com

Содержание NRX Digitrip 1150

Страница 1: ...64E Operating Manual for Series NRX Digitrip Trip Units 1150 1150i 1600 NRX SUB TITLE IMAGE 12 15 2010 Series NRX Type NF Frame ANSI UL1066 UL489 IEC IZMX16 IZM91 Series NRX Type RF Frame IEC IZMX40 4...

Страница 2: ...Plugs 34 Table 12 Series NRX RF Frames and Rating Plugs 35 TABLE OF CONTENTS Description page Section 1 Introduction 5 Section 2 Specification Tables 6 Section 3 General description 13 Section 4 Prin...

Страница 3: ...ay Module 20 Figure 12 Trip Unit Indicators LSIG style with Maintenance Mode 20 Figure 13 Display Module Push Buttons 21 Figure 14 Long Delay Time Setting Bands for I2 t settings 24 Figure 15 Short De...

Страница 4: ...d software measures should be implemented for the I O interface so that a line or wire breakage on the signal side does not result in undefined states in the automation devices and create an unwanted...

Страница 5: ...lay The frame module is fixed to the circuit breaker This module is matched to the frame interruption rating and sensors of the circuit breaker and should not be changed The trip unit module contains...

Страница 6: ...me flat Short delay zone interlock Flat I2 t 200 1000 x Ir 0 10 0 50 seconds 0 10 0 50 seconds option 50 5 ms 5 ms Instantaneous protection Instantaneous pickup OFF setting Making current release 200...

Страница 7: ...ge unbalance time 1 250 seconds 1 second Frequency Protection Frequency trip protection Enable Disable Underfrequency trip Off 45 65 Hz 0 1 Hertz Underfrequency time 0 20 5 0 seconds 0 02 seconds Over...

Страница 8: ...e unbalance alarm time 1 250 seconds 1 second Phase rotation alarm Off ABC CBA Alarms Frequency Frequency Alarms based on Van Enable Disable Underfrequency alarm Off 45 65 Hz 0 1 Hz Underfrequency ala...

Страница 9: ...mmon configured demand window All powers share a common configured demand window 9 EATON www eaton com Effective September 2013 Instructional Leaflet IL01301064E Operating Manual for Series NRX Digitr...

Страница 10: ...to 31 0 100 Phase B current IC Harmonics from 1 to 31 0 100 Phase C current IN Harmonics from 1 to 31 0 100 Neutral current Individual Harmonic Line to Line Voltage Data VAB Harmonics from 1 to 31 0...

Страница 11: ...IC IN IG VAB VBC VCA 10 cycles 6 pre event and 4 post event IA IB IC IN IG VAB VBC VCA 10 cycles 6 pre event and 4 post event Short Delay Instantaneous Ground Phase Loss Current Unbalance Over Voltag...

Страница 12: ...IA IB IC IN IB Voltage VAB VBC VCA VAN VBN VCN Power Watts VAR VA THD IA IB IC Demand IA IB IC IN Watts VAR VA Frequency Operations Count Temperature Power Factor IA IB IC IN IB VAB VBC VCA 6 cycles I...

Страница 13: ...tuator of the circuit breaker The Digitrip trip unit system consists of 3 modules the frame the trip unit and the display The frame module is fixed to the circuit breaker This module is matched to the...

Страница 14: ...le Rating Plug Installation Insert the rating plug into the cavity on the right side of the trip unit Wiggle the plug slightly to help align the pins on the plug with the sockets in the cavity The plu...

Страница 15: ...xternal power supply to be used for both trip unit power and communications power Note N All current protection features will be active when the current breaker load current reaches approximately the...

Страница 16: ...nes whether to initiate protection functions including tripping the circuit breaker using the trip actuator Trip and operation indicators The LEDs on the face of the trip unit shown in Figure 12 flash...

Страница 17: ...its a red Alarm LED will indicate the presence of ground current when it is in excess of the Ground Alarm setting See Table 4 for the specifications on all settings for all of the alarms A programmed...

Страница 18: ...value of 2 x Ir is exceeded This provides maximum selectivity for coordination with larger upstream circuit breakers Zone selective interlocking provides the fastest possible tripping for faults with...

Страница 19: ...creen information that can be viewed after the event Waveform capture Trip The following causes for a trip will perform a 10 cycle waveform capture The waveform information will contain 6 pre event cy...

Страница 20: ...p has occurred Metering Current Voltage Power Energy Frequency SEL SAVE ESC Status Maint Mode Long Short Inst Ground Trip Type NF Frame Group A Rating Plug In 400A Cat NA250T Test Port Aux Power Alarm...

Страница 21: ...to save settings This push button is covered by the clear cover and can be sealed to deter unauthorized changing and saving of the setpoints ESC Push Button Used to escape or move back to the previous...

Страница 22: ...e logging function From this submenu all of the data for the events can be viewed The number 1 event is the latest or last event that has occurred The following is a list of events and the maximum num...

Страница 23: ...ng related functions From this submenu a phase test or a ground test can be initiated Various current levels can be selected for checking the timing and programming of the setpoints to ensure proper c...

Страница 24: ...up value for Long Delay is 110 of the setting The 10 tolerance is then centered around this value This is done to ensure that the circuit breaker can carry the full rating of Ir if desired and progra...

Страница 25: ...will provide a longer time delay for current below 0 625 x In than will the FLAT response The ground time setting range for both FLAT and I2 t responses is 0 1 to 0 5 seconds in increments of 0 05 sec...

Страница 26: ...rogrammed for alarms With this contact an application of using an interposing relay with time delay can be employed to provide time and contact arrangements to interface with the circuit breaker s clo...

Страница 27: ...armonic distortion THD of each phase and neutral if valid and corresponding per harmonic data up to the 31st harmonic and crest factor are available via a waveform capture trigger This waveform captur...

Страница 28: ...is is the ground trip self test function of the LSIA style unit A ground trip test will not actually trip the circuit breaker but will only provide alarm display information and alarm relay operation...

Страница 29: ...rmance requirements stipulated by the NEC UL Standard No 1053 requires that certain minimum instructions must accompany each ground fault protection system These statements plus a copy of the record f...

Страница 30: ...TS RESTORE PROPER OPERATING CONDITIONS BEFORE RETURNING THE CIRCUIT BREAKER TO SERVICE Apply the same current as described above through any two phases of the circuit breaker The breaker should not tr...

Страница 31: ...In ______________________________ Ir Continuous Ampere Rating LDS x In ______________________________ Trip Function Per Unit Setting Multi Ampere Equivalent Setting Time Delay INST In Long Delay In S...

Страница 32: ...al installation in order to be available to the authority having jurisdiction Test Date Circuit Breaker Number Results Tested By Figure 21 Typical Performance Test Record Form 32 EATON www eaton com E...

Страница 33: ...o fully reset the latch circuit holding the associated cause of trip LEDs Battery Pull Off Tab Use Type 1 3 N Lithium Battery Only Battery Check Reset Battery Test 33 EATON www eaton com Effective Sep...

Страница 34: ...500 x x x NB500T IZMX_RP40B 500 600 x x NA600T IZMX_RP40A 600 x x x NB600T IZMX_RP40B 600 630 x x NA630T IZMX_RP40A 630 x x x NB630T IZMX_RP40B 630 800 x NA800T IZMX_RP40A 800 x x x NB800T IZMX_RP40B...

Страница 35: ...N 800A and 1000A Rating plugs are only available on NRX 1150 trip units rev 1 06 and higher Section 11 Maintenance Mode feature Arc flash Reduction Maintenance System mode ARMS WARNING ONLY CERTIFIED...

Страница 36: ...is enabled via device communications it must be disabled by device communications Remote Indicator Either Relay 1 or 2 can be programed to close when Maintenance Mode is enabled This contact can be u...

Страница 37: ...ction to enable or disable Source Ground Fault configuration is recovered by the jumper on the front of the CAM module Each of the CAM modules provide two normally open a relay contacts one to provide...

Страница 38: ...r the fault in 0 3 seconds as above Similarly in the event that the feeder breaker does not clear the fault the main breaker will clear the fault in 0 5 seconds as above Fault at location 2 The feeder...

Страница 39: ...m distance between two farthest breakers on different zones from the ZO downstream to ZI upstream terminals is 250 feet 76m A3 A maximum of 20 breakers may be contained in parallel in one zone A4 Prov...

Страница 40: ...High inrush phase currents may cause fictitious ground pickup momentarily If zone interlocking function is employed connect a jumper from Zout to Zin to provide some time delay See Section 6 Programmi...

Страница 41: ...switch is not on Refer to Section 11 Maintenance Mode feature and TD 01301014E for maintenance mode wiring connections Maintenance mode was initially enabled by communications and communications link...

Страница 42: ...elative humidity noncondensing 0 to 85 Control voltage consumption 6 watts Control voltage 24 Vdc 10 Alarm Relays 1 and 2 Resistive Load AC 0 5A 230 Vac AC 1A 120 Vac DC 1A 48 Vdc DC 0 35A 125 Vdc Ope...

Страница 43: ...Battery Check Reset Bettery Test Metering Current Voltage Power Energy Frequency SEL SAVE ESC Status Maint Mode Long Short Inst Ground Trip Type NF Frame Group A Rating Plug In 400A Cat NA250T Test Po...

Страница 44: ...the menu display screen or increase an adjustment value Down Arrow Push Button Used to move down in the menu display screens or decrease an adjustment value Right Arrow Push Button Used to move to a...

Страница 45: ...Ground Test Health Temperature Trip Count Operations Metering Menus Page 46 SEL SEL SEL SEL SEL SEL SEL Harmonics Menus Page 50 Events Menus Page 54 View Settings Menus Page 63 Program Settings Menus...

Страница 46: ...ering Current Voltage Power Energy Frequency SEL SEL Menu Metering Current Voltage Power Energy Frequency SEL SEL ESC SEL SEL SEL ESC SEL SEL ESC SEL ESC Current Voltage Power Energy Frequency Voltage...

Страница 47: ...ess Reset Menu R DEMAND XX Minute Int o IA IB IC IN SEL SEL j Use up or down push buttons to highlight yes or no menu choices k Pressing the select push button with yes highlighted resets the metered...

Страница 48: ...EL min RMS VAN VBN VCN SEL SEL max RMS VAN VBN VCN SEL SEL Reset Voltage Values no yes ESC SEL SEL R R R R R j Use up or down push buttons to highlight yes or no menu choices k Pressing the select pus...

Страница 49: ...VARh Leading SEL SEL Reset Values no yes ESC SEL SEL R Notes jkl Reset Press to access Reset Menu Frequency Metering Frequency f fmin fmax SEL SEL SEL SEL j Use up or down push buttons to highlight ye...

Страница 50: ...EL Menu Harmonics Do New Capture Waveform Harmonics Time Captured Menu Harmonics Do New Capture Waveform Harmonics Time Captured SEL SEL Menu Harmonics Do New Capture Waveform Harmonics Time Captured...

Страница 51: ...for Series NRX DigitripTrip Units 1150 1150i Do New Capture IA IB IC IN New Waveforms ESC SEL SEL Vab Vbc Vca New Waveforms SEL SEL Van Vbn Vcn New Waveforms SEL SEL Waveform Historic IA IB IC IN Hist...

Страница 52: ...to 10 SEL SEL IB Harmonics 31 SEL SEL IC Harmonics 1 to 10 SEL SEL IC Harmonics 31 SEL SEL IN Harmonics 1 to 10 SEL SEL IN Harmonics 31 SEL SEL VAB Harmonics 1 to 10 SEL SEL VAB Harmonics 31 SEL SEL V...

Страница 53: ...monics 1 to 10 SEL SEL VBN Harmonics 31 SEL SEL VCN Harmonics 1 to 10 SEL SEL VCN Harmonics 31 SEL SEL Time Captured DD Month YY HH MM SS ESC SEL SEL Time Captured j Thirty one 31 harmonic values are...

Страница 54: ...ents Displays Page 55 SEL SEL E Menu Events Summary Trip Alarm Time Change E Menu Events Summary Trip Alarm Time Change SEL SEL E Menu Events Summary Trip Alarm Time Change SEL SEL E Menu Events Summa...

Страница 55: ...newest event designated as 1 If a new Event Summary is added after 60 are already stored the oldest is deleted and the newest becomes 1 k Only 4 of the possible 12 Event Summary Displays are shown he...

Страница 56: ...balance Volt Unbal Open By Comm Long Delay Short Delay Rating Plug Rev Power Rev Phase Rev Sequence Bad Frame High Load MCR High Inst Over Temp Ground Fault Maint Mode Breaker Mech n The details of Tr...

Страница 57: ...N Value IG R Value SEL SEL Trip Event 1 VAB Value VBC Value VCA Value SEL SEL Trip Event 1 VAN Value VBN Value VCN Value SEL SEL j Trip Event 1 Waveforms Phase Current Ground Current VLL Voltage SEL S...

Страница 58: ...IA IB IC IN Trip Event 1 Waveform SEL SEL Cycle 10 IA IB IC IN Trip Event 1 Waveform SEL SEL Cycle 1 Ground Current or VLL Waveforms ESC SEL SEL Cycle 2 Ground Current or VLL Waveforms SEL SEL Cycle 1...

Страница 59: ...j Up to a maximum of 20 individual Alarm Event Displays are available If a new Alarm Event is added after 20 are already stored the oldest is deleted and the newest becomes 1 k Only 4 of the possible...

Страница 60: ...Value IG R Value SEL SEL Alarm Event 1 VAB Value VBC Value VCA Value SEL SEL Alarm Event 1 VAN Value VBN Value VCN Value SEL SEL j Alarm Event 1 Wave Forms Phase Current Ground Current VLL Voltage SE...

Страница 61: ...IC IN Alarm Event 1 Waveform SEL SEL Cycle 10 IA IB IC IN Alarm Event 1 Waveform SEL SEL Cycle 1 Ground Current or VLL Waveforms ESC SEL SEL Cycle 2 Ground Current or VLL Waveforms SEL SEL Cycle 10 G...

Страница 62: ...SEL SEL SEL SEL SEL Time Adj 20 Original New DD Month YY HH MM SS DD Month YY HH MM SS Time Adj 19 Original New DD Month YY HH MM SS DD Month YY HH MM SS Time Adj 18 Original New DD Month YY HH MM SS...

Страница 63: ...nu View Set Trip Alarms Comm Settings Time PGMTransfer Firmware SEL SEL Menu View Set Trip Alarms Comm Settings Time PGMTransfer Firmware SEL SEL Menu View Set Trip Alarms Comm Settings Time PGMTransf...

Страница 64: ...Page 65 ESC SEL SEL SEL SEL SEL SEL SEL View Set CurrentTrip Page 66 View Set VoltageTrip Page 67 View Set FreqTrip Page 68 View Set PowerTrip Page 68 SEL SEL SEL SEL SEL SEL SEL SEL View Set Current...

Страница 65: ...ystem Amp Demand DemandWindow Fixed or Sliding SEL SEL System Amp Demand Interval 5 60 min SEL SEL View Set System System Style Trip Unit ESC SEL System Rating Plug Amperes SEL SEL System Maint Mode S...

Страница 66: ...Delay PU Isd xIr 2 0 10 0 SEL SEL CurrentTrip Short Delay Time tsd 0 10 0 50 s SEL SEL CurrentTrip Instantaneous PU Ii xIn Off 12 0 SEL SEL CurrentTrip Ground Sensing Residual SEL SEL CurrentTrip Grou...

Страница 67: ...nbal Time 1 250 s SEL SEL VoltageTrip Press Escape to Exit SEL VoltageTrip Voltage Protection Enabled ESC SEL VoltageTrip Under Voltage Pickup Off 670 v SEL SEL VoltageTrip Under Voltage Time 1 250 s...

Страница 68: ...Hz SEL SEL FreqTrip Under Freq Time 0 20 5 00 s SEL SEL FreqTrip Over Freq Pickup Off 45 00 65 00 Hz SEL SEL View Set FreqTrip FreqTrip Frequency Protection Disabled ESC SEL FreqTrip Press Escape to...

Страница 69: ...alance Pickup Off 25 SEL SEL Current Alarm Amp Unbalance Time 1 240 s SEL SEL Current Alarm Press Escape to Exit SEL View Set Current Alarm Current Alarm High Load Pickup Off 1 00 ESC SEL Current Alar...

Страница 70: ...l Time 1 250 s SEL SEL Voltage Alarm Press Escape to Exit SEL Voltage Alarm Voltage Alarms Enabled SEL Voltage Alarm Under Voltage Pickup Off 670 v SEL SEL Voltage Alarm Under Voltage Time 1 250 s SEL...

Страница 71: ...larms Enabled ESC SEL Freq Alarm Under Freq Pickup Off 45 00 65 00 Hz SEL SEL Freq Alarm Under Freq Time 0 20 5 00 s SEL SEL Freq Alarm Over Freq Pickup Off 45 00 65 00 Hz SEL SEL View Set Freq Alarm...

Страница 72: ...Alarm Power Alarms Enabled ESC SEL Power Alarm Watt Demand Pickup Off 65500 kW SEL SEL Power Alarm Watt Demand Time 1 60 s SEL SEL Power Alarm VA Demand Pickup Off 65500 kVA SEL SEL Power Alarm VA Dem...

Страница 73: ...ee footnotes 3 4 for program options Press Escape to Exit View Set Relays jklm SEL SEL SEL SEL SEL j Relay 1 and Relay 2 can be configured to Off Trips or Alarms k All Relay Trips or Alarms can be Ena...

Страница 74: ...med Out Press Escape ESC SEL SEL jk View Time Time DD Month YY HH MM SS ESC l j This message is displayed if no communications module is attached k If a communications module is attached refer to the...

Страница 75: ...ad CAM Download ESC jk View Firmware Firmware Display Module VerXX RevXX Trip Unit VerXX RevXX ESC j If a communications module is not attached the display will appear as shown here k If a communicati...

Страница 76: ...Menu PGM Set Trip Alarms Comm Settings Time PGMTransfer Firmware SEL SEL Menu PGM Set Trip Alarms Comm Settings Time PGMTransfer Firmware SEL SEL Menu PGM Set Trip Alarms Comm Settings Time PGMTransfe...

Страница 77: ...stem Page 78 ESC SEL SEL SEL SEL SEL SEL SEL PGM Set CurrentTrip Page 79 PGM Set VoltageTrip Page 80 PGM Set FreqTrip Page 81 PGM Set PowerTrip Page 81 SEL SEL SEL SEL SEL SEL SEL SEL PGM Set Current...

Страница 78: ...nterval 5 60 min SEL SEL PGM Set System System Style Trip Unit ESC SEL System Rating Plug Amperes SEL SEL System Maint Mode State Off or On SEL SEL System Maint Mode Local Control Enabled or Disabled...

Страница 79: ...rt Delay Time tsd 0 10 0 50 s SEL SEL CurrentTrip Instantaneous PU Ii xIn Off 12 0 SEL SEL CurrentTrip Ground Sensing Residual SEL SEL CurrentTrip Ground Slope Flat or i2 t SEL SEL PGM Set CurrentTrip...

Страница 80: ...to Program SEL VoltageTrip Voltage Protection Enabled ESC SEL VoltageTrip Under Voltage Pickup Off 670 v SEL SEL VoltageTrip Under Voltage Time 1 250 s SEL SEL VoltageTrip Over Voltage Pickup Off 720...

Страница 81: ...SEL SEL FreqTrip Over Freq Pickup Off 45 00 65 00 Hz SEL SEL PGM Set FreqTrip FreqTrip Frequency Protection Disabled ESC SEL FreqTrip Press Save to Program SEL OR FreqTrip Over Freq Time 0 20 5 00 s...

Страница 82: ...Unbalance Time 1 240 s SEL SEL Current Alarm Press Save to Exit SEL PGM Set Current Alarm Current Alarm High Load Pickup Off 1 00 ESC SEL Current Alarm High Load Time 0 60 s SEL SEL Current Alarm Grou...

Страница 83: ...to Exit SEL Voltage Alarm Voltage Alarms Enabled ESC SEL Voltage Alarm Under Voltage Pickup Off 670 v SEL SEL Voltage Alarm Under Voltage Time 1 250 s SEL SEL Voltage Alarm Over Voltage Pickup Off 72...

Страница 84: ...kup Off 45 00 65 00 Hz SEL SEL Freq Alarm Under Freq Time 0 20 5 00 s SEL SEL Freq Alarm Over Freq Pickup Off 45 00 65 00 Hz SEL SEL PGM Set Freq Alarm Freq Alarm Frequency Alarms Disabled ESC SEL Fre...

Страница 85: ...att Demand Pickup Off 65500 kW SEL SEL Power Alarm Watt Demand Time 1 60 s SEL SEL Power Alarm VA Demand Pickup Off 65500 kVA SEL SEL Power Alarm VA Demand Time 1 60 s SEL SEL PGM Set Power Alarm Powe...

Страница 86: ...to Exit PGM Set Relays jklmn SEL SEL SEL SEL SEL j Relay 1 and Relay 2 can be configured to Off Trips or Alarms k All Relay Trips or Alarms can be Enabled or Disabled l The Alarm possibilities are an...

Страница 87: ...e instruction leaflet for details IL01301033E ICAM IL01301034E MCAM IL01301035E PROFIBUS IL01301052E Ethernet l The screen acts like a clock and increments Program PGMTransfer PGMTransfer CAM Upload C...

Страница 88: ...ays Page 89 SEL SEL PhaseTest GroundTest PhaseTest GroundTest SEL SEL ESC SEL SEL SEL ESC PhaseTest GroundTest PGM PhaseTest Displays Page 89 SEL SEL ESC 88 EATON www eaton com Operating Manual for Se...

Страница 89: ...NoTrip j ESC SEL Test Current 0 1 14 0 PU SEL SEL Test Current Press Save toTest SEL SEL SEL SEL SEL SEL SEL PGM Ground Test TripType Trip NoTrip j ESC SEL Test Current 0 1 2 0 PU SEL SEL Test Curren...

Страница 90: ...ations Temperature Trip Count Operations SEL SEL Temperature Trip Count Operations SEL SEL ESC SEL SEL SEL ESC SEL Temperature Trip Count Operations SEL SEL SEL SEL ESC ESC Trip Count Displays Page 91...

Страница 91: ...p Units 1150 1150i Temperature Temperature DeviceTemp xx x Deg C ESC SEL SEL Temperature MaxTemp xx x Deg C dd month yy HH MM SS SEL Trip Count Faults SDT INST ESC SEL SEL Events LDT GFT SEL SEL SEL O...

Страница 92: ...current relative to voltage is 90 theta 90 VARs are positive when the phase angle of current relative to voltage is 180 theta 360 Under these conditions current lags the voltage The sign of power fac...

Страница 93: ...tructional Leaflet IL01301064E Operating Manual for Series NRX DigitripTrip Units 1150 1150i Figure 27 IEEE Sign Convention Phasor Diagram Figure 28 IEEE Direct Mathematical Sign Convention Phasor Dia...

Страница 94: ...Window Power Demand Interval 15 Minutes Energy Log Window Off Long Delay Slope I2 t Long Delay Pickup 100 Long Delay Time 4 s Thermal Memory Enabled Time Dial Setting for IEC IEEE Slopes only 20 s Sh...

Страница 95: ...ng Off Current Unbalance Alarm Time Delay 10 s Voltage Alarms Off Under Voltage Alarm Setting Off Under Voltage Alarm Time Delay 30 s Over Voltage Alarm Setting Off Over Voltage Alarm Time Delay 30 s...

Страница 96: ...munications Off Maintenance Mode Trip Off Neutral Trip Off MCR High Instantaneous Trip Off Bell Any trip Off If Relay 1 Configured for Alarms Long Delay Alarm Off High Load Alarm Off Low PF Alarm Off...

Страница 97: ...ower Trip Off Under Frequency Trip Off Over Frequency Trip Off Over Temperature Trip Off Rating Plug Trip Off Opened by Communications Off Maintenance Mode Trip Off Neutral Trip Off MCR High Instantan...

Страница 98: ...RTICULAR PURPOSE OR MERCHANTABILITY OTHER THAN THOSE SPECIFICALLY SET OUT IN ANY EXISTING CONTRACT BETWEEN THE PARTIES ANY SUCH CONTRACT STATES THE ENTIRE OBLIGATION OF EATON THE CONTENTS OF THIS DOCU...

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