TM 10-6640-215-13 4-22.  REMOVE/INSTALL EXPLOSIVE PROOF DISTRIBUTION BOX A13 COMPONENTS - continued. b. Remove two screws, nuts, flat washers, and lockwashers attaching relay to panel. c. Remove defective control relay. INSTALLATION 1. Install Control Relay.  See figure 4-11. a. Place new relay on mounting panel and attach with two screws, flat washers, lockwashers and nuts. b. Connect relay electrical leads and tighten terminal screws. 2. Install Terminal Board.  See figure 4-11. a. Replace  new  terminal  board  on  mounting  plate  and  attach  with  four  screws,  lockwashers,  flat  washers, standoffs and nuts. b. Connect all electrical leads and tighten terminal screws. ASSEMBLY Assemble Explosive Proof Distribution Box A13.  See figure 4-11. a. Place mounting panel in junction box and attach with four mounting screws, flat washers, lockwashers and standoffs. b. Align  the  junction  box  cover  plate  onto  the  junction  box  and  attach  with  twenty  cover  plate  bolts  and  flat washers. c. Connect power input cable (paragraph 2-7), and close circuit breakers A1CB1, A1CB2. d. Run operational test to verify new components. 4-51