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Underfloor spaces containing appliances shall be provided with an unobstructed passageway large enough to remove the largest appliance, but not less than 30 inches (762 mm) high and 22 inches (559 mm) wide, nor more than 20 feet (6096 mm) long measured along the centerline of the passageway from the opening to the appliance. A level service space not less than 30 inches (762 mm) deep and 30 inches (762 mm) wide shall be present at the front or service side of the appliance. If the depth of the passageway or the service space exceeds 12 inches (305 mm) below the adjoining grade, the walls of the passageway shall be lined with concrete or masonry extending 4 inches (102 mm) above the adjoining grade in accordance with Chapter 4. The rough-framed access opening dimensions shall be not less than 22 inches by 30 inches (559 mm by 762 mm), and large enough to remove the largest appliance.

Exceptions:
  1. The passageway is not required where the level service space is present when the access is open, and the appliance can be serviced and removed through the required opening.
  2. Where the passageway is unobstructed and not less than 6 feet (1829 mm) high and 22 inches (559 mm) wide for its entire length, the passageway shall not be limited in length.
M1305.1.3.1 Ground Clearance
Equipment and appliances supported from the ground shall be level and firmly supported on a concrete slab or other approved material extending not less than 3 inches (76 mm) above the adjoining ground. Such support shall be in accordance with the manufacturer's installation instructions. Appliances suspended from the floor shall have a clearance of not less than 6 inches (152 mm) from the ground.
M1305.1.3.2 Pit Locations
Appliances installed in pits or excavations shall not come in direct contact with the surrounding soil and shall be installed not less than 3 inches (76 mm) above the pit floor. The sides of the pit or excavation shall be held back not less than 12 inches (305 mm) from the appliance. Where the depth exceeds 12 inches (305 mm) below adjoining grade, the walls of the pit or excavation shall be lined with concrete or masonry. Such concrete or masonry shall extend not less than 4 inches (102 mm) above adjoining grade and shall have sufficient lateral load-bearing capacity to resist collapse. Excavation on the control side of the appliance shall extend horizontally not less than 30 inches (762 mm). The appliance shall be protected from flooding in an approved manner.
M1305.1.3.3 Electrical Requirements
A luminaire controlled by a switch located at the required passageway opening and a receptacle outlet shall be installed at or near the appliance location in accordance with Chapter 39. Exposed lamps shall be protected from damage by location or lamp guards.

Related Code Sections

306.4 General Regulations, Appliances Under Floors
Under-floor spaces containing appliances shall be provided with an access opening and unobstructed passageway large enough to remove the largest ...
306.4 General Regulations, Appliances Under Floors
Underfloor spaces containing appliances shall be provided with an access opening and unobstructed passageway large enough to remove the largest ...
306.4 General Regulations, Appliances Under Floors
Underfloor spaces containing appliances shall be provided with an access opening and unobstructed passageway large enough to remove the largest ...
306.4 General Regulations, Appliances Under Floors
Underfloor spaces containing appliances shall be provided with an access opening and unobstructed passageway large enough to remove the largest ...