Abstract: A preheater system for waste oil burners utilizes a primary preheater remote from the burner nozzle and a secondary preheater adjacent the burner nozzle. The primary preheater ordinarily provides heat to the waste oil when the burner is operating. The secondary preheater ordinarily maintains the waste oil adjacent the burner nozzle at atomization temperature when the burner is not operating. Flow of waste oil from the primary preheater to the burner nozzle is precluded when the burner is not operating.

Abstract: The distance between the combustion nozzle and the pump of a waste oil heater can be significantly increased by using a positive displacement pump which is proximate to the reservoir and remote from the nozzle, contary to the usual positioning of oil delivery pumps. The pump, which is not pressure regulated, thus pushes oil to the nozzle at a constant flow rate regardless of oil pressure at the nozzle.

Abstract: A standoff attached to an outlet box on the opposite side thereof from a wall stud on which the box is mounted. The box has an open front located adjacent an opening in wallboard attached to one side of the wall stud. The standoff projects rearwardly of the box for engaging the inner surface of wallboard attached to the opposite side of the wall stud for preventing rearward movement of the box. The standoff has selectively frangible portions for adapting it for use with outlet boxes and wall studs of different depths.

Abstract: For use with apparatus of the type including a power supply, means operated by the power from the power supply and means operably connected between the power supply and the means operated thereby for applying power of a predetermined magnitude for operating said operated means circuitry and method wherein a resistor is connected to the apparatus and cycling limiting circuitry is connected across the resistor and is responsive to the voltage drop thereacross when the operated means cycles, i.e. turns off and then on. The cycling limiting circuitry counts the number of cycles and after a predetermined number of cycles occurs provides an output which is effective for interrupting power from the power supply, whereby the operating means is removed from the circuit to protect the latter from damage due to unlimited cycling.

Abstract: A battery powered tester has an electrical testing circuit combining continuity, polarity, and voltage amplitude circuits. The testing circuit for measuring a test voltage or relative continuity has first and second inputs to which first and second test points can be respectively coupled by RED and BLACK prods. The continuity, polarity, and voltage amplitude circuits are coupled in parallel to the first and second inputs, the polarity circuit being symmetrically coupled to the inputs. The polarity circuit has first and second polarity lamps and a sensing circuit for lighting the first polarity lamp when the test voltage is positive and lighting the second polarity lamp when the test voltage is negative. The continuity circuit has a continuity lamp separate from the polarity lamps and a driving circuit for lighting the continuity lamp whenever a zero or low passive impedance is coupled to the first and second inputs.

Abstract: A fitter bolt bracket is provided for holding a luminaire to a luminaire support. The bracket comprises an elongated metal piece having a base section joining two raised edge sections, with the bracket having a channel shaped cross section. The raised edge sections each have a cut out portion, and the base section has two holes one near either end. The bracket holes are aligned with two laterally and longitudinally offset holes in the upper housing of the luminaire. The cut out portion of the raised edge section are axially aligned with a tubular luminaire support. The bracket is held to the upper housing by two bolts each one passing through one hole in the bracket and threading into the corresponding hole in the upper housing.

Abstract: A bracket for mounting an outlet box to a stud comprising a first flat portion including at least one opening for receiving a fastener or fastening means, a second flat portion located in a plane at an angle to the plane in which the first flat portion is located, and a third flat portion forming an angle with the second flat portion and at least a portion of which is capable of being severed from the bracket. Preferably, the second flat portion is located in a plane at a right angle to the plane in which the first flat portion is located, and the third flat portion forms an obtuse angle with the second flat portion. The bracket can be used with metal or wood studs and can be secured to either the open or the closed end of a stud.

Abstract: The present invention relates to a starter circuit case assembly having a starter section and a cap assembly. The starter section includes a starter circuit mounted on a circuit board and is securely engaged by the cap assembly. The cap assembly is mounted to and electrically connected to the light fixture.

Abstract: A direct-fired make-up furnace comprises a cabinet which houses an air blower. A gas fired burner located in a sloped passage, which is formed by walls of a return air compartment and a by-pass air compartment, radiates heat at an angle relative to the blower. The return air compartment substantially blocks direct radiation of the burner. An exit opening of the by-pass air compartment is located between the burner and the blower.