4-20. REMOVE/INSTALL EXPLOSIVE PROOF DISTRIBUTION BOX A3
This task covers:
General Mechanics Tool Kit, (Appendix B, Section III, Item 2)
Lockwashers, (Appendix F)
General Safety Instructions
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.
Disassemble Explosive Proof Distribution Box A3. See figure 4-9.
Open main circuit breaker A I CB I and turn generator off.
Mark distribution box cover left side before removing.
Remove six screws from outside metal panel to gain access to distribution box which is located below main
Remove twenty eight mounting screws, and flat washers attaching cover to distribution box and remove
Remove Timer Relay A3K 1. See figure 4-9.
Relay A3K I is a plug-in type relay and is removed by simply lifting relay from socket.
The procedure for removing the remaining four control relays is identical to those outlined in the following steps.
Remove Control Relay. See figure 4-9.
Loosen terminal screws on relay, disconnect electrical leads and tag for reconnection.