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III
. . . . . . . . . . . . . . . . . . . . . . . . 23-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24-1
Preparation for maintenance . . . . . . . . . . . . . . . . . . . . . 24-2
Opening the circuit breaker and
discharging the closing spring . . . . . . . . . . . . . . . . . . 24-2
Removing the circuit breaker from the cradle . . . . . . . 24-3
Changing front panel . . . . . . . . . . . . . . . . . . . . . . . . . . . 24-4
Checking arc chutes . . . . . . . . . . . . . . . . . . . . . . . . . . . 24-5
Removing arc chutes . . . . . . . . . . . . . . . . . . . . . . . . . 24-6
Visual inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24-6
Installing arc chutes . . . . . . . . . . . . . . . . . . . . . . . . . . 24-7
Inspection of arc chute covers . . . . . . . . . . . . . . . . . . . . 24-8
Checking contact erosion . . . . . . . . . . . . . . . . . . . . . . . . 24-9
Exchanging the primary disconnects . . . . . . . . . . . . . . 24-11
Exchanging the finger cluster . . . . . . . . . . . . . . . . . . 24-11
Catalog numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . 24-13
Exchanging the stab tip . . . . . . . . . . . . . . . . . . . . . . . 24-14
Catalog numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24-15
. . . . . . . . . . . . . . . . . . . . . . . 25-1
General Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25-2
Primary Injection Phase Current Testing . . . . . . . . . . . . . 25-4
Primary Injection Ground Fault Current Testing . . . . . . . 25-5
Achieving Correct External Neutral Sensor Polarity . . . . 25-7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26-1
Low-voltage circuit breakers disposal . . . . . . . . . . . . . . . 26-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29-1
30
Index
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30-1
Summary of Contents for UL 489
Page 36: ...5 21 Frame size II 3000 A Frame size III 1 Holes 14 mm 0720 1 0721_nu ...
Page 63: ...7 2 Horizontal connectors 0733_nu top view ...
Page 64: ...7 3 Rear vertical connectors 0734_nu top view rear view ...
Page 65: ...7 4 Front connectors 0736_nu front view top view ...
Page 66: ...7 5 Front connectors and pressure wire terminals 0737_nu top view front view ...
Page 67: ...7 6 7 2 Frame size II fixed mounted version 0494 3_nu ...
Page 68: ...7 7 Class C always 0494 5_nu top view rear view ...
Page 69: ...7 8 2500 0738_nu LH side view front view ...
Page 71: ...7 10 7 4 Frame size III fixed mounted version 0495 1_nu LH side view ...
Page 72: ...7 11 0495 2_nu top view top view ...
Page 73: ...7 12 0495 3_nu top view rear view ...
Page 75: ...7 14 7 5 Door cut outs fixed mounted circuit breaker Frame size I 0735_nu ...
Page 76: ...7 15 Frame size II III 0496_nu ...
Page 77: ...7 16 7 6 Frame size I draw out version 0745_nu ...
Page 78: ...7 17 0746_nu rear view top view ...
Page 79: ...7 18 0747_nu bottom view ...
Page 80: ...7 19 0748_nu ...
Page 81: ...7 20 0749_nu ...
Page 82: ...7 21 7 7 Frame size II draw out version 0490 1_ul ...
Page 86: ...7 25 7 8 Frame size III draw out version ...
Page 87: ...7 26 ...
Page 88: ...7 27 ...
Page 89: ...7 28 7 9 Door cut outs for draw out circuit breakers Frame size I 0750_nu ...
Page 91: ...7 30 7 11 External sensor for neutral conductor WLNCT2 ...
Page 92: ...7 31 WLNCT3 ...
Page 107: ...9 5 I tripping Ground fault tripping ...
Page 351: ......