Lee Electric, 599, Class 2 Signaling Transformer Oil Burner 120V 24 VAC 40VA. Class 2; Primary Voltage 120 Vac; Secondary Voltage 24 V; 1 Tap(S); 50/60 HZ; Power Rating 40 Va; Outlet Box / Surface Mounting; Size 2-1/4 Inch W X 2-15/16 Inch D X 2-1/8 Inch H; Approval Ul Listed. The Lee Electric 599 transformers offer high power for long wire runs or for applications requiring greater power such as door openers. Ideal for large apartments and building elevators. When selecting transformers, attention should be given to the power requirements of the signal or load and the wire run between the transformer and load.