41 U.S.C. § 6702: Contracts to which this chapter applies

(a) In General.—Except as provided in subsection (b), this chapter applies to any contract or bid specification for a contract, whether negotiated or advertised, that—(1) is made by the Federal Government or the District of Columbia; (2) involves an amount exceeding $2,500; and (3) has as its principal purpose the furnishing of services in the United States through the use of service employees. (b) Exemptions.—This chapter does not apply to—(1) a contract of the Federal Government or the District of Columbia for the construction, alteration, or repair, including painting and decorating, of public buildings or public works; (2) any work required to be done in accordance with chapter 65 of this title; (3) a contract for the carriage of freight or personnel by vessel, airplane, bus, truck, express, railway line or oil or gas pipeline where published tariff rates are in effect; (4) a contract for the furnishing of services by radio, telephone, telegraph, or cable companies, subject to the Communications Act of 1934 (47 U.S.C. 151 et seq.); (5) a contract for public utility services, including electric light and power, water, steam, and gas; (6) an employment contract providing for direct services to a Federal agency by an individual; and (7) a contract with the United States Postal Service, the principal purpose of which is the operation of postal contract stations.