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Subchapter 7. General Industry Safety Orders
Group 1. General Physical Conditions and Structures Orders
Article 4. Access, Work Space, and Work Areas
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§3271. Openings.

(a) Openings to attics, furred ceiling spaces, and underfloor spaces shall not be less than 22 inches by 30 inches.

(Title 24, Par 2, Section 2-3320(f))


1. Where fixed ladders extend through such openings, the openings shall be not less than 30 inches by 30 inches.

2. Floor furnaces located in underfloor spaces shall have openings of not less than 18 inches by 24 inches.

(b) When the opening is less than 4 feet in any dimension, the appliance or equipment shall not be located more than 20 feet from the opening.

(Title 24, Part 2, Section 2-3320(g))

(c) Where for inspection or maintenance it is necessary to pass through roof and ceiling trapdoors which are of such size and weight that to open or close them subjects an employee to the risk of injury, they shall be constructed and maintained so that they can be easily opened and closed from a safe working position.

(Title 24, Part 4, Section 4-504)

NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18493(c), Health and Safety Code.


1. Amendment filed 7-16-76; effective thirtieth day thereafter (Register 76, No. 29).

2. Amendment filed 2-26-85; effective thirtieth day thereafter (Register 85, No. 9).

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