TM 1-4920-438-13&P
FIELD MAINTENANCE
POWER TRAIN SHOP
MAINTENANCE INSTRUCTIONS FOR CIRCUIT BREAKERS
INITIAL SETUP:
Personnel Required
Tools and Special Tools
CMF 15 Series (1)
Electrical Repairers Tool Kit
Equipment Condition
(WP 0067 00, Table 2, Item 103 )
Functional
Multimeter (WP 0067 00, Table 2, Item 106 )
WARNING
HIGH VOLTAGE exists in electrical system of shop. All electrical inspections, repairs, or
replacements will be performed with power OFF and only by a qualiied electrician. Serious
shock hazards exist which could result in INJURY OR EVEN DEATH to personnel.
NOTE
During installation of components same hardware should be used so as to maintain original
integrity of shop set.
INSPECTION OF INSTALLED ITEMS
Inspect circuit breakers for any apparent damage.
TEST AND INSPECTION
WARNING
HIGH VOLTAGE exists in electrical system of shop. All electrical inspections, repairs, or
replacements will be performed with power OFF and only by a qualiied electrician. Serious
shock hazards exist which could result in INJURY OR EVEN DEATH to personnel.
1.
Move all circuit breakers to OFF position and tag.
NOTE
This procedure covers obsolete NQOB circuit breaker panel and new NQOD circuit breaker
panel. These units are distinguishable by nameplates attached to panel boards.
2.
To remove panel cover and board:
a.
NQOD - Remove four screws and four washers and lift circuit breaker panel cover from panel board.
b.
b. NQOB - Move clamp ingers to OPEN position and lift circuit breaker panel cover from panel board.
0055 00-1