California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 5 - Electrical Safety Orders
Group 2 - High-Voltage Electrical Safety Orders
Article 11 - Metal-Enclosed Bus
Section 2767 - Barriers and Seals

Bus runs having sections located both inside and outside of building shall provide a vapor seal at the building wall to prevent interchange of air between indoor and outdoor sections unless forced cooled. Fire barriers shall be provided at walls where fire separation is required.

(Title 24, Part 3, Section 364-25.)

1. Editorial correction filed 11-2-83 (Register 83, No. 45).

Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), Health and Safety Code.