Abstract: Nuisance tripping is reduced in a power protection and distribution system including an upstream circuit breaker, a power distribution bus, and one or more downstream circuit breakers. A signal indicative of a current or pending downstream circuit breaker tripping action, such as a Zone Selective Interlocking (ZSI) signal, normally used to delay tripping of the upstream breaker, is used to suppress an optical flash detection system from tripping the upstream breaker in response to an optical flash resulting from the tripping of the downstream breaker. In this way, nuisance tripping of the upstream breaker is avoided when the downstream breaker trips (and the ZSI function is preserved).

Abstract: In a power protection and distribution assembly a trip system monitors electrical current and sends a current status signal to an arc flash protection system indicating whether current characteristic of an arc event is detected. The arc flash protection system evaluates this current status signal along with a light status signal indicating whether light characteristic of an arc event has been detected. Based on this evaluation, the arc flash protection system sends a control signal to the trip system for controlling the trip system to trip a breaker. The systems each include a full-duplex signaling module for sending the signals between the systems over a pair of conductors. Each signaling module sends one of the signals by modulating the magnitude of a current through or a voltage across the conductors, and receives the other signal by demodulating the magnitude of the current through or the voltage across the conductors, as distinctively modulated by the other signaling module.

Abstract: In a power protection and distribution assembly a trip system monitors electrical current and sends a current status signal to an arc flash protection system indicating whether current characteristic of an arc event is detected. The arc flash protection system evaluates this current status signal along with a light status signal indicating whether light characteristic of an arc event has been detected. Based on this evaluation, the arc flash protection system sends a control signal to the trip system for controlling the trip system to trip a breaker. The systems each include a full-duplex signaling module for sending the signals between the systems over a pair of conductors. Each signaling module sends one of the signals by modulating the magnitude of a current through or a voltage across the conductors, and receives the other signal by demodulating the magnitude of the current through or the voltage across the conductors, as distinctively modulated by the other signaling module.

Abstract: Nuisance tripping is reduced in a power protection and distribution system including an upstream circuit breaker, a power distribution bus, and one or more downstream circuit breakers. A signal indicative of a current or pending downstream circuit breaker tripping action, such as a Zone Selective Interlocking (ZSI) signal, normally used to delay tripping of the upstream breaker, is used to suppress an optical flash detection system from tripping the upstream breaker in response to an optical flash resulting from the tripping of the downstream breaker. In this way, nuisance tripping of the upstream breaker is avoided when the downstream breaker trips (and the ZSI function is preserved).

Abstract: A current limiting system in accordance with the present invention comprises an accessory or canopy mount device that is permanently installed between a source of electrical power 1 and a track lighting system 2. The system may be installed integrally with a track lighting system to supply power to a plurality of lighting tracks from a plurality of power sources or circuits, as desired by a user or lighting designer. The system may also be configured to be compatible with a wide variety of track lighting system power tracks and is difficult to remove once properly installed, thereby making it tamper-proof.

Abstract: A current limiting system in accordance with the present invention comprises an accessory or canopy mount device that is permanently installed between a source of electrical power 1 and a track lighting system 2. The system may be installed integrally with a track lighting system to supply power to a plurality of lighting tracks from a plurality of power sources or circuits, as desired by a user or lighting designer.

Abstract: A current limiting system in accordance with the present invention comprises an accessory or canopy mount device that is permanently installed between a source of electrical power 1 and a track lighting system 2. The system may be installed integrally with a track lighting system to supply power to a plurality of lighting tracks from a plurality of power sources or circuits, as desired by a user or lighting designer. The system may also be configured to be compatible with a wide variety of track lighting system power tracks and is difficult to remove once properly installed, thereby making it tamper-proof.

Abstract: A current limiting system in accordance with the present invention comprises an accessory or canopy mount device that is permanently installed between a source of electrical power 1 and a track lighting system 2. The system may be installed integrally with a track lighting system to supply power to a plurality of lighting tracks from a plurality of power sources or circuits, as desired by a user or lighting designer. The system may also be configured to be compatible with a wide variety of track lighting system power tracks and is difficult to remove once properly installed, thereby making it tamper-proof.

Abstract: A current limiting system in accordance with the present invention comprises an accessory or canopy mount device that is permanently installed between a source of electrical power 1 and a track lighting system 2. The system may be installed integrally with a track lighting system to supply power to a plurality of lighting tracks from a plurality of power sources or circuits, as desired by a user or lighting designer. The system may also be configured to be compatible with a wide variety of track lighting system power tracks and is difficult to remove once properly installed, thereby making it tamper-proof.

Abstract: A power inverter comprises a push-pull inverter circuit that includes a transformer having a primary winding coupled to a DC bus and a secondary winding coupled to an AC bus, main power switches coupling each end of the primary winding to a DC return, and one or more supplemental power switches coupling at least one end of the primary winding to a snubber bus. The supplemental switch at a given end of the primary winding forms a buck-mode converter in combination with the primary winding and the associated free-wheeling diode at that end of the primary winding, and can be controlled by a switching controller to effect energy transfer between the snubber bus and DC bus. The switching controller can be configured to control power flow between the DC, AC, and snubber buses by controlling the common-mode and differential-mode voltages of the primary winding via main/supplemental power switch control.

Abstract: An aqueous composition containing wool grease and a cationic or nonionic surfactant can be used to stabilise a wide range of particulate materials. The composition can be used to stabilise road materials, earth banks, coal piles, loose sand and dams. A binder such as a lignin sulphonate may be added to provide improved properties.

Abstract: A novel child's bicycle seat/rack assembly is provided. The seat is capable of slidable attachment to a touring rack of the type including a substantially rectangular frame formed from struts. The seat has integrally-formed channels for slidably engaging the struts and forward and rear integrally-formed, latches adapted to releasably engage the struts so as to lock the seat member against rearward movement relative to the rack. A locking wedge is provided to secure a latch against unintentional flexing and disengagement from the strut. A child's seat may have a seat portion and a back portion pivotably attached to one another. The seat also may have a grab bar and a seat stand.

Abstract: A floor construction of wood panels (12) overlying a base support (11) with a layer (13) of yieldably resilient materials (14, 15) sandwiched between the panels (12) and the base support (11). The materials (14, 15) are of mutually different stillnesses, one being a relatively large main panel area of an open-cellular material (14) and the other being a relatively small area of a closed-cellular material (15) in the form of strips bordering the main panel area. The open-cellular material (14) provides a large degree of vibration isolation, whilst the closed-cellular (stiffer) material (15) stabilizes the panels in the vicinity of panel-to-panel joints and/or the floor periphery.

Abstract: A composite diamond abrasive compact is produced from fine diamond particles in the conventional manner except that a thin layer of fine carbide particles is placed between the diamond particles and the cemented carbide support. The provision of the thin layer of carbide particles reduces the incidence of the formation of imperfect sinter areas in the compact.

Abstract: A cultured egg-milk product is formed by combining whole or skim milk, skim milk powder, sugar and liquid, whole or powdered egg, adding selected bacterial cultures such as LB.sub.1 strain of Lactobacillus bulgaricus and TS.sub.2 strain of Streptococcus thermophilus, and fermenting until a predetermined degree of bacterial growth has been achieved to produce a cultured egg-milk product having desired qualities of texture and taste.

Abstract: An improved method for preparing clay-based grease compositions is described whereby a clay containing pre-grease is prepared and a water phase separated from the clay-bearing pre-grease prior to the addition of an epoxide which is cured, e.g., simultaneously with the dehydration of the pre-grease. The grease compositions prepared in this manner show improved water resistance over those wherein the epoxide is added prior to separation of the water phase and the grease is also more responsive to the addition of conventional grease additives such as extreme pressure additives, anti-corrosion additives and anti-oxidants.

Abstract: An improved method for preparing clay-based grease compositions is described whereby a clay containing pre-grease is prepared and a water separated from the clay-bearing pre-grease prior to the addition of an epoxide which is cured, e.g., simultaneously with the dehydration of the pre-grease. The grease compositions prepared in this manner show improved water resistance over those wherein the epoxide is added prior to separation of the water phase and the grease is also more responsive to the addition of conventional grease additives such as extreme pressure additives, anti-corrosion additives and anti-oxidants.