4-21. EXPLOSION PROOF DISTRIBUTION BOX A13 COMPONENTS.
This task consists of:
General Mechanics Tool Kit, (Appendix B, Section III, Item 1)
General Safety Instructions
Before performing any maintenance actions on electrical equipment, ensure all
electrical power has been turned off. Failure to comply with this warning may
result in serious injury or death.
Disassemble Explosion Proof Distribution Box A13. See Figure 4-11.
Open circuit breakers A1CB1 and A1CB2 located in Main Power Panel. Disconnect power to Mod Lab at power
Remove 20 screws (1) and cover (2).
Remove Control Relay K1 thru K4.
Tag and disconnect relay K1 thru K4 (3) electrical leads by loosening relay terminal screws.
Loosen two screws (4) and remove relay K1 thru K4 (3).
Remove Terminal Board TBGND.
Tag and disconnect terminal board TBGND (5) electrical leads by loosen terminal board screws.
Remove two screws (6) and terminal board TBGND (5).
Remove Terminal Board TB1 thru TB4.
Tag and disconnect terminal board TB1 or TB3 (7) electrical leads by removing terminal board screws.
Remove four screws (8), lockwashers (9), and terminal board TB1 or TB3 (7). Discard lockwashers.
Tag and disconnect terminal board TB2 or TB4 (10) electrical leads by removing terminal board screws.
Remove four screws (11), lockwashers (12), and washers (13) and carefully withdraw mounting panel (14) to gain
access to terminal board TB2 or TB4 (10) mounting hardware. Retain four standoffs (15) for reassembly. Discard
Remove four screws (16), lockwashers (17), washers (18), standoffs (19) and terminal board TB2 or TB4 (10).