4-22. REMOVE/INSTALL EXPLOSIVE PROOF DISTRIBUTION BOX A3
This task covers:
General Mechanics Tool Kit, (Appendix B, Section III, Item 2)
General Safety Instruction
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
Disassemble Explosive Proof Distribution Box A13. See figure 4-11.
Open circuit breakers A1CB1 and A1CB2 located in Main Power Panel. Disconnect power input cable
Remove twenty junction box cover plate mounting screws with flat washers and remove cover.
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.
Remove Terminal Board. See figure 4-11.
Loosen terminal board terminal screws, tag and disconnect all electrical leads.
Remove four terminal board screws, nuts, flatwashers, and lockwashers from mounting panel.
Remove defective terminal board. See figure 4-11.
The procedures for removing the four control relays are identical and are outlined in the following steps.
Remove Control Relay. See figure 4-11.
Loosen relay terminal screws, tag and disconnect electrical leads.