In Acme Markets, Inc. v. Workers' Comp. Appeal Bd. (Purcell), 819 A.2d 143 (Pa. Cmwlth. 2003), this Court stated that the Act sets forth two situations in which an injury may be sustained in the course of employment: (1) where the employee, whether on or off the employer's premises, is injured while actually engaged in the furtherance of the employer's business or affairs, or; (2) where the employee although not actually engaged in the furtherance of the employer's business or affairs: (a) is on the premises occupied or under the control of the employer, or upon which the employer's business or affairs are being carried on; (b) is required by the nature of his employment to be present on his employer's premises; (c) sustains injuries caused by the condition of the premises or by operation of the employer's business or affairs thereon. Id. at 147 (quoting Workmen's Comp. Appeal Bd. (Slaugenhaupt) v. United States Steel Corp., 31 Pa. Commw. 329, 376 A.2d 271, 273 (Pa. Cmwlth. 1977)).