1. Power Distribution System General Location

2. Power Distribution The Main Switchboard is the hub of the electrical distribution system. Everything ties into the 480 Volt Bus in the Main Switchboard. Some devices and sub-panels are directly connected to the bus through breakers. Other sub-panels are connected to the main bus through step-down transformers that divide the power to 220 volt systems or 120 volt systems. Keep in mind, the main bus is divided into a port and starboard side; linked by the bus tie breaker (normally closed). Shore power and the Port Generator feed the starboard side of the bus, and the Starboard Generator feeds the port side of the bus. Also, off-ship power comes of the port side of the bus. Yeah, it’s a little backwards, but that’s what we got. Take a look at the next slide for clarification… Main Switchboard

3. Power Distribution Starboard Genset (#2) Port Genset (#1) Off-Ship Power 50 amp breaker Shore Power In 100 amp breaker Buss Tie Breaker Normally Closed

4. Power Distribution Breakers off the Main Bus (Starboard side of bus) Deck Crane HPU 120 Volt Transformer T-3 220 Volt Transformer T-1 460 Volt FiFi Panel #1 Spares Port Motor Controller (MCC) Breaker (Connects Port Motor control panel to port side of 480 volt bus.)

5. Power Distribution Breakers off the Main Bus (Port side of bus) Spare Fwd Capstan HPU Aft Capstan HPU Spare Off Ship Power (Export) 460 Volt FiFi Panel #2 120 Volt Transformer T-4 220 Volt Transformer T-2 Starboard Motor Controller (MCC) Breaker (Connects Starboard Motor control panel to starboard side of 460 volt bus.)

6. Power Distribution E/R 480 Volt Panels #1 and #2 MCC P401P and P403S Items controlled from these panels: Fire/GS/Ballast pump Auxiliary Sea Water Cooling pumps (VSP and gearbox cooling) Tempered Water Cooling pumps (for A/C system) F.O. Transfer Pumps Black Water Transfer Pumps Grey Water Transfer Pumps Bilge Pump Rescue Platform HPU

7. Power Distribution E/R 480 Volt Panels #1 and #2 MCC P401P and P403S Open this panel up, and you will find the breakers for: Breathing Air Compressor Service Air Compressor #1 E/R Supply Fan #1 E/R Supply Fan #2 Service Air Compressor #2 HVAC/CBRN Electric Duct Pre-Heater VSP # 1 Main Control Power VSP #2 Main Control Power HVAC/CBRN Supply Fan #1 HVAC/CBRN Supply Fan #2

8. Power Distribution FiFi Panel #1 P402P 460 Volt Centerline of Aft Hold Breakers for: Foam Pumps 1 and 2 FiFi System Cabinet B FiFi System Cabinet H Port Main Engine Jacket Water Heater FiFi System Cabinet D FiFi System Cabinet I Stbd Main Engine Jacket Water Heater VSP Room Fan Aft Hold Fan

9. Power Distribution FiFi Panel #2 P404S 460 Volt In front of you as you enter Aft Hold Breakers for: Foam Pumps 3 and 4 FiFi System Cabint G Pump Engine #1 Jacket Water Heater Reverse Cycle Heat Pump Unit #2 Pump Engine #2 Jacket Water Heater Reverse Cycle Heat Pump Unit #1 Electric Duct Heater (Make up air handler)

10. Power Distribution Step Down Transformers Power is stepped down form 480 Volt A/C from the main bus to 220 and 120 Volt A/C via transformers. There are two (2) transformers for the 220 Volt A/C system and two for the 120 Volt A/C system. The system is configured this way for redundancy. Should the primary transformer for either system fail, the transformer may be switched to the secondary at the incoming breaker boxes seen here. 120 Volt transformer switching on the top. 220 Volt transformer switching on the bottom.

11. Step Down Transformers Power Distribution Close-up of 220 Volt Transformer Incoming Breaker Box. Ground Fault Detection Mechanical Switch Plate

12. Power Distribution Step Down Transformers 120 Volt Transformers #4 #3 220 Volt Transformers #2 #1

13. Power Distribution 220 Volt Panels P200S and P200P Aft Hold, Fwd Bulkhead, near Centerline P200P P200S

14. Power Distribution 220 Volt Panels P200S and P200P Aft Hold, Fwd Bulkhead, near Centerline P200S Contains Breakers for: Wheelhouse Fan Coil Unit #2 Cook Top (Galley) Sea Chest Impressed Current System Potable Water Pump #2 Water Heater 55 Amp Machinery Room Welder Receptacle #1 55 Amp Machinery Room Welder Receptacle #2 Deck Light Circuit #2 Wheelhouse Split System FCU #2

15. Power Distribution 220 Volt Panels P200S and P200P Aft Hold, Fwd Bulkhead, near Centerline P200P Contains Breakers For: Wheelhouse Split System FCU#1 Potable Water Pump #1 Wheelhouse Fan Coil Unit #1 Pump #3/Engine #7 Jacket Water Heater (C-12) 55 Amp Equipment Room Welder Receptacle Deck Light Circuit #1 Wheelhouse Split System Condensing Unit #2 Wheelhouse Demisting Fans Intercom/P.A. System

16. Power Distribution 110 Volt Panels P100 Aft E/R, Starboard Side P100 Contains Breakers for: 120 Volt Boat Deck Panel P101 and Whistle 120 Volt Hold Deck Panel P103 24 Volt Emergency Batt. Charger#1 120 Volt Main Deck Panel P102 120 Volt Main Deck Panel P104 Navigation Lighting Main Supply Central Machinery Alarm & Monitoring Main Supply CCTV System General Alarm System Main Supply Fire Alarm and Detection Main Supply 12 Volt Emergency Services Batt. Charger #1

17. Power Distribution 110 Volt Panels P103 (Sub-Panel) Aft E/R, Port Side By Main Switch Board P103 Contains Breakers For: Main Deck Lighting Circuit #2 24 Volt E/R Service Battery Charger #1 24 Volt E/R Service Battery Charger #2 Hold Accommodation Lighting Circuit #2 Hold Accommodation Lighting Circuit #1 Machinery Space Receptacles Circuit #1 VSP #1 Auxiliary Power VSP #2 Auxiliary Power Machinery Space Lighting Circuit #1 FiFi System Cabinet C 110 VAC 32A for remote valves FiFi System Cabinet E 110 VAC 10A for remote valves FiFi System Cabinet F 110 VAC 32 A for remote valves Machinery Receptacles Circuit #2 Machinery Receptacles Circuit #3 24V Fire Monitor Battery Charger #2 Generator #2 Anti-Condensation Heater Generator #2 Jacket Water Heater U.V. Sterilizer 24V Fire Monitor Battery Charger #1 Generator #1 Anti-Condensation Heater Generator #1 Jacket Water Heater Equipment Room Cord Reel (30A)

18. Power Distribution 110 Volt Panels P102 (Sub-Panel) Main Deck, Multipurpose Room Starboard Side Aft P102 Contains Breakers for: Equipment Room Door Boat Deck and Wheelhouse lighting Circuit #2 Refrigerator Microwave Coffee Maker Hold Accommodation Lighting Circuit #1 Boat Deck and Main Deck Receptacle Circuit #1 Machinery Space Lighting Circuit #2 Boat Deck and Main Deck Receptacle Circuit #2 Pantry Receptacles Circuit Main Deck Receptacles Circuit #1 Main Deck Receptacles Circuit #2 CIC Receptacles Circuit Hold Accommodation Receptacles Circuit #2 Boat Deck WC Fan and Damper CBRN Fan #2 Damper Main Deck Lighting Circuit #1 ROV Outlet on Workbench (38 Amp) CBRN Detection Fan Main Deck Shower and WC Fan & Damper

19. Power Distribution 110 Volt Panels P104 (Sub-Panel) Boatdeck, HVAC Space Behind CIC Starboard Side Aft P104 Contains Breakers for: Equipment Room Fan CIC Fan Coil Unit #2 Multi-Purpose Room Fan Coil Unit #2 Recovery Area Fan Coil Unit Galley Range Hood Damper System (Via Alarm System CIC Fan Coil Unit #1 Multi-Purpose Room Fan Coil Unit #1 General Stores Fan Coil Unit EMS Area Fan Coil Unit Interior Fire Dampers

20. Power Distribution 110 Volt Panels P101 (Sub-Panel) Wheelhouse – Port Stack Bulkhead P101 Contains Breakers for: 24V Emergency Battery Charger #2 12V Wheelhouse Service Battery Charger #1 12V Wheelhouse Service Battery Charger #2 12V Emergency Service Battery Charger #2 Window Wipers Mast Floodlight Law Enforcement Light #1 Law Enforcement Light #2 Boat Deck and Wheelhouse Lighting Circuit #1 Boat Deck and Wheelhouse Receptacles Circuit #1 Boat Deck and Wheelhouse Receptacles Circuit #2 Wheelhouse Top Receptacle Wheelhouse Top Rail FWD & STBD Floodlights Crane Basket Floodlights Circuit Search Light #1 Searchlight #2 Ice Maker (Galley) Portable Radio Chargers (Wheelhouse, CIC, Multipurpose Room) Wheelhouse Top Rail AFT & Port Floodlights CIC Communications Computer Boat Deck Floodlights Circuit Crane Basket Receptacles Satellite Telephone/Internet CBRN Fan #1 Damper