S.C. Code § 7-13-190
2017 Act No. 15, Sections 4 to 5, provide as follows:
"SECTION 4. SECTION 1 [amending (B)] takes effect upon approval by the Governor and applies to elections for which candidate filings begin on or after that date.
"SECTION 5. SECTION 2 [deleting (E)] takes effect on January 1, 2018, and applies to elections for which candidate filings begin on or after that date."