Eaton Digitrip RMS Series Instructional Leaflet

Also see for Cutler-Hammer Digitrip RMS 510: Instructions Instructions Instruction leaflet

TESTING OF A CIRCUIT BREAKER SHOULD BE DONEONLY IN THE “TEST,” “DISCONNECTED” OR “REMOVE”CELL POSITIONS.6.2 Performance Testing for GroundFault Trip Units6.2.1 Code RequirementsThe National Electrical Code under Article 230-95-C requiresthat any ground fault protection system be performancetested when first installed. The test shall be conducted inaccordance with approved instructions provided with theequipment. A written record of this test shall be made andshall be available to the authority having inspection jurisdic-tion.6.2.2 Standards RequirementsAs a follow-up to the basic performance requirements stipu-lated by the N.E.C. in Section 6.2.1, UL Standards No. 1053requires that certain minimum instructions must accompanyeach ground fault protection system. The following articleplus the test record form illustrated in Figure 9 are intendedto satisfy this requirement.6.2.3 General Test InstructionsThe interconnected system shall be evaluated in accordancewith the equipment assembler’s detailed instructions byqualified personnel.The polarity of the neutral sensor connections, if used, mustagree with the equipment assembler’s detailed instructionsto avoid improper operations following apparently correctsimulated test operations. Where a question exists, consultthe specifying engineer and/or equipment assembler.The grounding points of the system shall be verified todetermine that ground paths do not exist that would bypassthe sensors. The use of high voltage testers and resistancebridges may be used. warNINgTHERE IS A HAZARD OF ELECTRICAL SHOCK OR BURNWHENEVER WORKING IN OR AROUND ELECTRICALEQUIPMENT. ALWAYS TURN OFF POWER SUPPLYINGTHE BREAKER BEFORE CONDUCTING TESTS.Effective July 2010 Instructional Leaflet IL8700C39-04Using a low voltage, 0-24 volts, high current, AC source,apply a test current of 125% of the Digitrip Ground Fault TripUnit pickup setting through one phase of the circuit breaker,as shown in Figure 8a. This should cause the breaker to tripin less than 1 second, and an alarm indicator should operate,if one is supplied. Reset the breaker and the alarm indicator.Repeat the test on the other two phases.If the system is a 4-wire system with a neutral current sen-sor, apply the same current as described above through onephase of the breaker, returning through the neutral sensor,as shown in Figure 8b. The breaker should not trip, and thealarm indicator, if supplied, should not operate. Repeat thetest on the other two phases.If the system is a 3-wire system with no neutral currentsensor, apply the same current as described above throughany two phases of the breaker, with the connections exactlyas shown in Figure 8c. The breaker should not trip, and thealarm indicator, if supplied, should not operate. Repeat thetest using the other two combinations of breaker phases. CauTIONFIELD TESTING SHOULD BE USED FOR FUNCTIONALTESTING AND NOT FIELD CALIBRATION OF THE DIGI-TRIP GROUND FAULT TRIP UNIT.ANY TEMPORARY CONNECTION MADE FOR THE PUR-POSE OF CONDUCTING TESTS SHOULD BE RESTOREDTO PROPER OPERATING CONDITIONS BEFORE RE-TURNING THE BREAKER TO SERVICE.THE RESULTS OF THE TEST ARE TO BE RECORDED ONTHE TEST FORM PROVIDED (FIGURE 9).7.0 Record KeepingFor convenience, a trip function record as shown in Figure 10is included. This record should be filled in giving the indicat-ed reference information and initial time/current trip functionsettings. If desirable, a copy could be made and attached tothe interior of the breaker cell door or other visible location.Figure 11 is also included as a convenient way of providing aplace for recording test data and actual trip values.Ideally, sheets of this type should be used and maintainedby those personnel in the user’s organization that have theresponsibility for protection equipment.18 eaTOn CORPORaTIOn www.eaton.com