(ii) In addition to the dimensions set forth in § 1926.1002(i)(1)(i), the following dimensions apply to Figure W-28:

H=17.5 in. (444 mm.)

J=2 in. (50.8 mm.) measured from the outer periphery of the steering wheel.

(3) Crush test performance requirements. The protected zone as described in Figure W-28 must not be violated.

(g) Source of standard. This standard is derived from, and restates, the portions of Society of Automotive Engineers Standard J167 which pertain to overhead protection requirements. The full title of the SAE standard is: Protective Frame with Overhead Protection-Test Procedures and Performance Requirements. The SAE standard shall be resorted to in the event that questions of interpretation arise. The SAE standard appears in the 1971 SAE Handbook, which may be examined in each of the Regional Offices of the Occupational Safety and Health Administration.

Subpart X-Effective Dates

AUTHORITY: Sec. 107, Contract Work Hours and Safety Standards Act (Construction Safety Act) (40 U.S.C. 333); secs. 4, 6, 8, Occupational Safety and Health Act of 1970 (29 U.S.C. 653, 655, 657); Secretary of Labor's Order No. 12-71 (36 FR 8754).

§ 1926.1050 Effective dates (general).

Except where different effective dates are specifically provided in § 1926.1051, the safety and health standards published in Subparts C through U of this part shall become effective on April 24, 1971, for all Federal and federally assisted advertised contracts subject thereto which are advertised after that date and on April 27, 1971, for all such negotiated contracts for which negotiations begin after that date.

§ 1926.1051 Effective dates (specific).

(a) With respect to standards concerning brakes and fenders prescribed in § 1926.602, the rules contained therein specify the applicable effective dates.

(b)(1) To the extent that the standards in this part apply to light residential construction, their application is delayed until September 27, 1971, whereupon the standards shall apply to contracts subject to the Contract Work Hours and Safety Standards Act which are advertised on or after that date and to such contracts which may be negotiated when the negotiations commence on or after that date.

(2) For the purpose of this paragraph, the term "light residential construction" is limited to the construction of homes and apartments which do not exceed three stories in height, and which do not have an elevator.