TM 10-6640-239-13 4-47 INSTALL 1. Install Terminal Board TB1 thru TB4.  See Figure 4-11. a. Install terminal board TB2 or TB4 (10) and secure with four screws (16), lockwashers (17), washers (18), and standoffs (19). b. Install mounting panel (14) and secure with four screws (11), lockwashers (12), washers (13), and standoffs (15). c. Connect electrical leads as tagged to terminal board TB2 or TB4 (10).  Remove tags. d. Install terminal board TB1 or TB3 (7) and secure with four screws (8) and lockwashers (9). e. Connect electrical leads as tagged to terminal board TB1 or TB3 (7).  Remove tags. 2. Install Terminal Board TBGND. a. Install terminal board TBGND (5) and secure with two screws (6). b. Connect electrical leads as tagged to terminal board TBGND (5).  Remove tags. 3. Install Control Relay K1 thru K4. a. Install relay K1 thru K4 (3) and secure by tightening two screws (4). b. Connect electrical leads as tagged to relay K1 thru K4 (3).  Remove tags. 4. Assembly Explosion Proof Distribution Box A13. a. Install cover (2) and secure with 20 screws (1). b. Connect power to Mod Lab at power distribution module. c. After purge cycle close circuit breakers A1CB1 and A1CB2. d. Run operational test to verify components.