Specific Locations—Article 511
through 516 Questions and Answers.
A major repair shop is a building or portion of a building used for lubrication, inspection, and
minor automotive maintenance work, such as engine tune-ups, replacement of parts, fluid
changes (e.g., oil, antifreeze, transmission fluid, brake fluid, air-conditioning refrigerants), brake
system repairs, tire rotation, and similar routine maintenance work, including associated floor
space used for offices, parking, or showrooms. - Answer false
511.2
Major and minor repair garages that dispense motor fuels into the fuel tanks of vehicles,
including flammable liquids having a flash point below ? , such as gasoline, or gaseous fuels such
as natural gas, hydrogen, or LPG, shall have the dispensing functions and components classified
in accordance with Table 514.3(B)(1) in addition to any classification required by this section. -
Answer 100°F
511.3(B)
Where Class I liquids or gaseous fuels are transferred or dispensed in a major repair garage, the
area up to ? above the floor level of the room is considered unclassified where the room is
provided with ventilation of at least 1 cubic foot per minute per square foot of floor area, with
suction taken from a point within 12 inches of floor level. - Answer 18"
Table 511.3(C)
Where Class I liquids or gaseous fuels are transferred or dispensed in a major repair garage, the
entire space within any pit, below grade work area, or subfloor work area that is provided with
ventilation of at least 1 cubic foot per minute per square foot of floor area with suction taken
from a point within ? of floor level is considered Class I, Division 2. - Answer 12"
Table 511.3(C)
Where Class I liquids or gaseous fuels are not transferred or dispensed in a minor repair garage,
the area up to 18 inches above floor level extending three feet horizontally in all directions from
, Where lighter-than-air gaseous fueled vehicles are repaired or stored in a major repair garage,
the area within 18 inches of the ceiling, unless otherwise noted, is considered ? . - Answer
either b. or c.
Table 511.3(D)
Electrical equipment installed in commercial repair and storage garages in a fixed position shall
be located above the level of any defined Class I location or shall be ? for the location. - Answer
identified
511.7(B)(1)
Where plug connections are made to vehicles and the cord is suspended from overhead, it shall
be arranged so that the lowest point of sag is at least ? above the floor. - Answer 6"
511.10(B)(3)
Portable Equipment is equipment with electrical components suitable to be moved by a single
person without mechanical aids. (CMP-14) - Answer True
100
The area within ? horizontally from aircraft power plants or aircraft fuel tanks shall be classified
as a Class I, Division 2 or Zone 2 location that shall extend upward from the floor to a level ?
above the upper surface of wings and of engine enclosures. - Answer 5' / 5'
513.3(C)(1)
Attachment plugs and receptacles in the Class I locations of aircraft hangars shall be identified
for Class I locations or shall be designed such that they ? while the connections are being made
or broken. - Answer cannot be energized
513.4(A)
through 516 Questions and Answers.
A major repair shop is a building or portion of a building used for lubrication, inspection, and
minor automotive maintenance work, such as engine tune-ups, replacement of parts, fluid
changes (e.g., oil, antifreeze, transmission fluid, brake fluid, air-conditioning refrigerants), brake
system repairs, tire rotation, and similar routine maintenance work, including associated floor
space used for offices, parking, or showrooms. - Answer false
511.2
Major and minor repair garages that dispense motor fuels into the fuel tanks of vehicles,
including flammable liquids having a flash point below ? , such as gasoline, or gaseous fuels such
as natural gas, hydrogen, or LPG, shall have the dispensing functions and components classified
in accordance with Table 514.3(B)(1) in addition to any classification required by this section. -
Answer 100°F
511.3(B)
Where Class I liquids or gaseous fuels are transferred or dispensed in a major repair garage, the
area up to ? above the floor level of the room is considered unclassified where the room is
provided with ventilation of at least 1 cubic foot per minute per square foot of floor area, with
suction taken from a point within 12 inches of floor level. - Answer 18"
Table 511.3(C)
Where Class I liquids or gaseous fuels are transferred or dispensed in a major repair garage, the
entire space within any pit, below grade work area, or subfloor work area that is provided with
ventilation of at least 1 cubic foot per minute per square foot of floor area with suction taken
from a point within ? of floor level is considered Class I, Division 2. - Answer 12"
Table 511.3(C)
Where Class I liquids or gaseous fuels are not transferred or dispensed in a minor repair garage,
the area up to 18 inches above floor level extending three feet horizontally in all directions from
, Where lighter-than-air gaseous fueled vehicles are repaired or stored in a major repair garage,
the area within 18 inches of the ceiling, unless otherwise noted, is considered ? . - Answer
either b. or c.
Table 511.3(D)
Electrical equipment installed in commercial repair and storage garages in a fixed position shall
be located above the level of any defined Class I location or shall be ? for the location. - Answer
identified
511.7(B)(1)
Where plug connections are made to vehicles and the cord is suspended from overhead, it shall
be arranged so that the lowest point of sag is at least ? above the floor. - Answer 6"
511.10(B)(3)
Portable Equipment is equipment with electrical components suitable to be moved by a single
person without mechanical aids. (CMP-14) - Answer True
100
The area within ? horizontally from aircraft power plants or aircraft fuel tanks shall be classified
as a Class I, Division 2 or Zone 2 location that shall extend upward from the floor to a level ?
above the upper surface of wings and of engine enclosures. - Answer 5' / 5'
513.3(C)(1)
Attachment plugs and receptacles in the Class I locations of aircraft hangars shall be identified
for Class I locations or shall be designed such that they ? while the connections are being made
or broken. - Answer cannot be energized
513.4(A)
