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 THE CLASS I DIVISION 1 HAZARDOUS LOCATION EXTENDS FROM THE GROUND UP TO 18 INCHES ABOVE THE GROUND. ONLY USE ELECTRICAL EQUIPMENT WHICH IS APPROVED FOR THE APPLICABLE HAZARDOUS LOCATION.
 (3)  
Electrical equipment which is energized or operated within 50 feet horizontally and 18 inches or less above the ground of an open fuel tank, must be rated explosion-proof for Class I, Division 1 hazardous locations. This includes energized plugs and receptacles. For radio and radar equipment (transmitting equipment) see Table 201 for separation distance requirements.

 S 912-231

 (4)  
Figure 201 shows the different classification of hazardous locations around airplanes with open fuel tanks.

 S 912-232

 (5)  
Only use approved explosion-proof flashlight that operate correctly in the fuel tanks.

 NOTE: The use of explosion-proof lights in or near an open fuel
____ tank is allowed only by approved persons. The air in the fuel tank must be 10 percent or less of the lower explosive limit (LEL).
 S 912-233
 (6)  
Only use explosion-proof flood extension lights and power cords which are approved to supply external light.

 S 912-234

 (7)  
Do not connect or disconnect electrical equipment from energized outlets (within 100 feet of an open fuel tank) unless the equipment is fitted with explosion-proof plugs.

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 28-11-00
 ALL  ú ú 01 Page 210 ú Jun 20/97

A

757
MAINTENANCE MANUAL

 S 912-235
 (8)  Do not use electrical test equipment which can cause sparks in a fuel tank.
 S 942-236
 WARNING: WHEN YOU GO INTO THE FUEL TANK, DO NOT STAND ONE FOOT
_______ OR LESS DIRECTLY IN FRONT OF THE DENSITOMETER EMITTER FOR MORE THAN 15 HOURS PER WEEK. THE DENSITOMETER EMITTER CONTAINS A LOW LEVEL RADIOACTIVE SOURCE. IF YOU STAND IN FRONT OF THE EMITTER FOR LONGER THAN THE ALLOWED TIME, IT IS POSSIBLE THAT IT CAN CAUSE HEALTH PROBLEMS.
 (9)  
AIRPLANES WITH THE HONEYWELL FUEL QUANTITY INDICATING SYSTEM; The densitometer emitter contains a low level radioactive source. If maintenance is necessary on the densitometer emitter, contact your nearest Honeywell, Inc. representative.

 E.
Purging and Fuel Tank Entry - Equipment Precautions

 S 912-237
 (1)  
All metal work platforms or stands used for entry into the fuel tanks or located within a 50-foot radius of an open fuel tank (before and after the fuel tank purging) must be bonded to the airplane and grounded to an approved earth ground.
　
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