TEST 8 AN EMERGENCY ELECTRICAL POWER SERVICE MUST BE PROVIDED ON BOARD IN THE EVENT OF A MANI POWER FAILURE. SUCH A SUPPLY IS REQUIRED FOR EMERGENCY LIGHTING, ALARMS, COMMUNICATIONS, WATERTIGHT DOORS AND OTHER SERVICES NECESSARY TO MAINTAIN SAFETY AND TO PERMIT SAFE EVACUATION OF THE SHIP. REGULATIONS REQUIRE THAT THE EMERGENCY POWER SOURCE BE A GENERATOR, OR BATTERIES, OR BOTH. THE EMERGENCY POWER SOURCE MUST BE SELF- CONTAINED AND NOT DEPENDENT UPON ANY OTHER ENGINE ROOM POWER SUPPLY. A BATTERY WHEN FULLY CHARGED IS OBVIOUSLY SELF-CONTAINED. AN EMERGENCY GENERATION MUST HAVE AN INTERNAL COMBUSTION ENGINE AS PRIME MOVER AND HAVE ITS OWN FUEL SUPPLY TANK, STARTING EQUIPMENT AND SWITCHBOARD IN THE NEAR VICINITY. THE EMERGENCY POWER SOURCE MUST COME INTO ACTION FOLLOWING A TOTAL MAINS FAILURE. EMERGENCY BATTERIES CAN BE ARRANGED TO BE SWITCHED INTO SERVICE IMMEDIATELY FOLLOWING A MAIN POWER FAILURE. EMERGENCY GENERATORS CAN BE HAND CRANKED, BUT ARE USUALLY AUTO-MATICALLY STARTED BY COMPRESSED AIR OR A BATTERY TO ENSURE IMMEDIATE RUN-UP FOLLOWING A MAIN POWER FAILURE
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