S.C. Code Ann. § 38-11-40
Every insurer shall have and maintain investments, of the classes described in this section, to the extent of policyholder obligations and minimum capital, or guaranty fund, and surplus less, with respect to insurers other than life insurers, an amount equal to thirty percent of its surplus as regards policyholders. In no event may insurers, other than life insurers, have and maintain investments of the character described below less than an amount equal to seventy percent of policyholder obligations and one hundred percent of the minimum required capital, or guaranty fund, and surplus:
(e) Obligations or stock, where stated, of the following agencies or instrumentalities of the United States, whether or not such obligations are guaranteed by the government:
(i) Bonds, notes, or debentures of solvent corporations existing under the laws of the United States or any of its states or territories, the District of Columbia, Canada, or any of its provinces, if the obligations are qualified under any of the following:
(4) If a life insurer, in obligations, or in commercial paper or bankers' acceptances, or similar evidences of indebtedness customarily issued at a discount from principal value, issued, assumed, or guaranteed by any business entity created or existing under the laws of the United States, or any state, which are not in default as to principal or interest; provided, that either the obligation is or the issuing, assuming or guaranteeing business entity's or business entities' long-term obligations are rated one of the four highest grades by any of the nationally recognized statistical rating organizations recognized by the NAIC-SVO or one or two by the NAIC-SVO.
As used in this subitem, "business entity" means a sole proprietorship, corporation, limited liability company, association, general or limited partnership, joint stock company, joint venture, mutual fund, bank, trust, real estate investment trust, joint tenancy, or other similar form of business organization, whether organized for-profit or not-for-profit.
As used in this subitem, "obligation" means a bond, note, debenture, trust certificate including an equipment trust certificate, production payment, negotiable bank certificate of deposit, bankers' acceptance, asset-backed security, credit tenant loan, loan secured by financing a net lease or net leases, and other evidence of indebtedness for the payment of money (or participations, certificates or other evidences of an interest in any of the foregoing), whether constituting a general obligation of the issuer or payable only out of certain revenues or certain funds pledged or otherwise dedicated for payment.
(j) Preferred or guaranteed stocks or shares, other than common stocks, of solvent institutions existing under the laws of the United States or of any of its states, districts, or territories, if all of the prior obligations and prior preferred stocks, if any, of the institution at the date of acquisition by the insurer are eligible as investments under this chapter and if qualified under either of:
(1) Preferred stocks or shares are considered qualified if both of these requirements are met: