TM 10-6640-239-13 2-5 Table 2-3.  Power Panel No. 2 Controls and Indicators Index Number Control or Indicator Function 1 A15CB2 Provides 20A circuit protection for ECU number 2. 2 A15CB4 Provides 20A circuit protection for ECU number 4. 3 A15CB6 Provides 20A circuit protection for Air Compressor. 4 A15CB8 Provides 15A circuit protection for Water Pump. 5 A15CB10 Provides 15A circuit protection for Mechanical Room Door Interlock and Lighting. 6 A15CB12 Provides 15A circuit protection for Utility No. 1. 7 A15CB11 Provides 15A circuit protection for Fume Hood Exhaust blowers. 8 A15CB9 Provides 15A circuit protection for Vacuum Pump. 9 A15CB7 Provides 20A circuit protection for Water Chiller. 10 A15CB5 Not Used. 11 A15CB3 Provides 20A circuit protection for ECU number 3. 12 A15CB1 Provides 20A circuit protection for ECU number 1. Figure 2-3.  Power Panel No. 2 Controls and Indicators