26 CFR §1.167(l)-4

1. (a)Application of section 167(l) to certain property subject to asset depreciation range system. If the taxpayer elects to compute depreciation under the asset depreciation range system described in § 1.167(a)-11 with respect to certain public utility property placed in service after December 31, 1970, see § 1.167(a)-11(b) (6).