29 CFR §1926.1201

1. (a)This standard sets forth requirements for practices and procedures to protect employees engaged in construction activities at a worksite with one or more confined spaces, subject to the exceptions in paragraph (b) of this section.
2. (b)Exceptions. This standard does not apply to:
   1. (1)Construction work regulated by subpart P of this part (Excavations).
   2. (2)Construction work regulated by subpart S of this part (Underground Construction, Caissons, Cofferdams and Compressed Air).
   3. (3)Construction work regulated by subpart Y of this part (Diving).
3. (c)Where this standard applies and there is a provision that addresses a confined space hazard in another applicable OSHA standard, the employer must comply with both that requirement and the applicable provisions of this standard.