TM 10-6640-215-13 4-22.  REMOVE/INSTALL EXPLOSIVE PROOF DISTRIBUTION BOX A3 COMPONENTS. This task covers: a. Disassembly c.   Installation b. Removal d.   Assembly INITIAL SET-UP Tools Required General Mechanics Tool Kit, (Appendix B, Section III, Item 2) General Safety Instruction WARNING ELECTRICAL SHOCK Before   performing   any   maintenance   actions   on   electrical   equipment,   ensure   all electrical power has been turned off.  Death or serious injury may occur from failure to do this. DISASSEMBLY Disassemble Explosive Proof Distribution Box A13.  See figure 4-11. a. Open  circuit  breakers  A1CB1  and  A1CB2  located  in  Main  Power  Panel.    Disconnect  power  input  cable (paragraph 2-9). b. Remove twenty junction box cover plate mounting screws with flat washers and remove cover. c. Remove four panel mounting screws, lockwashers, and flat washers.  Carefully withdraw mounting panel to gain access to junction box interior.  Retain four standoffs for reassembly. REMOVAL 1. Remove Terminal Board.  See figure 4-11. a. Loosen terminal board terminal screws, tag and disconnect all electrical leads. b. Remove four terminal board screws, nuts, flatwashers, and lockwashers from mounting panel. c. Remove defective terminal board.  See figure 4-11. NOTE The procedures for removing the four control relays are identical and are outlined in the following steps. 2. Remove Control Relay.  See figure 4-11. a. Loosen relay terminal screws, tag and disconnect electrical leads. 4-49