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Subchapter 4. Construction Safety Orders
Article 4. Dusts, Fumes, Mists, Vapors, and Gases
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§1537. Welding, Cutting, and Heating of Coated Metals.

(a) Before welding, cutting, or heating is commenced on any surface covered by a preservative coating of unknown flammability, a test shall be made by a qualified person to determine its flammability.

(b) Precautions shall be taken to prevent ignition of highly flammable hardened preservative coatings. When coatings are determined to be highly flammable, they shall be stripped from the area to be heated to prevent ignition.

(c) All surfaces covered with toxic preservatives, including coatings which generate toxic substances upon heating, shall be stripped for a distance of at least four inches from the area of heat application, or employees shall be required to use supplied-air respirators in accordance with Section 1531, or the provisions of Section 1536(b), (c) shall apply.

NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.


1. New section filed 6-18-75; effective thirtieth day thereafter (Register 75, No. 25).

2. Amendment of NOTE filed 12-13-84; effective thirtieth day thereafter (Register 84, No. 50).

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