S.C. Code § 58-9-350
Every telephone utility shall have the right, and may be so required, to charge annually as an operating expense a reasonable sum for depreciation and credit it to a reserve account for such purpose. Such reserve account shall be charged with plant retirements. But if the reserve thus created shall at any time in the judgment of the Commission be excessive, the Commission after due hearing shall make such order as will result in credits to such reserve thereafter conforming to actual facts and conditions as ascertained by the Commission.
The Commission may control or limit such depreciation reserve.
Nothing in this section shall be construed to be in conflict with or in violation of the provisions of the Communications Act of Congress of 1934, as amended (U. S. C. A. Title 47, Sections 151 through 609), nor shall anything herein be construed to be in conflict with any lawful order of the Federal Communications Commission issued pursuant to the authority vested in it by said act of Congress.
S.C. Code § 58-9-350