General Electric Heater CoilHeater Selection Information To prevent overloading the starter, do not select heater(s) for a motor of larger rating than the maximum given on the nameplate for the starter. For continuous rated motors, with a service factor of 1.15 to 1.25,select the heater with maximum motor amperes equal to or immediately greater than the motor full-load […]Read more
Cutler-Hammer Heater CoilMagnetic Motor Control Heater coils are rated to protect 40½°C rise motors, and open and drip-proof motors having a service factor of 1.15 where the motor and the controller are at the same ambient temperature. For other conditions: For 50½°C, 55½°C, 75½°C rise motors and enclosed motors having a service factor of 1.0, select one […]Read more
Color Application for HID LampsClear Mercury Landscape lighting, specialized floodlighting such as copper roofs DX Mercury Stores, public spaces – Multi-vapor; however, are preferred MV Stores, public spaces, industrial, gymnasiums, floodlighting signs & buildings, parking areas, sports MV/C Same as MV – warmer color – diffuse coating reduces brightness LU Street lighting, parking areas, industrial, floodlighting, security, CCTV LU/DX […]Read more
Occupancy Sensor Application GuideSensor Type Catalog Number Appropriate Application Small Offices Automatic Wall Switch WS3000 Small, Individual Offices. Sensors should have a direct, clear front view of stationary occupants. Be sure sensors will not be blocked by doors, filing cabinets, etc. 360° Ceiling Mount or Wide Angle CS1001WA1001 Small, Individual Offices where wall switch location is a problem. […]Read more
Occupancy Sensor Design GuideDO Use Ultrasonic sensors in areas screened by partitions or furniture Use PIR in enclosed spaces Create zones controlled by different sensors to manage lighting in large areas Use dual technology sensors for areas with very low activity levels Install sensors on a vibration-free, stable surface Position sensors above or close to the main areas […]Read more
Basic Proximity Sensor OperationsSensing: The inductive proximity will sense all metals. The exact point at which a target will be detected is influenced by the type of metal, its size and surface area. The following charts show the sensing fields for a standard target: 45mm sq., mild steel, 1mm thick. Standard Range Shielded – Can be mounted flush […]Read more
Hazardous Location BasicsDefinitions HAZARDOUS LOCATION: An Area where the possibility of explosion and fire is created by the presence of flammable gases, vapors, dusts, fibers or flying. Classes CLASS I (NEC-500-4): Those areas in which flammable gases or vapors may be present in the air in sufficient quantities to be explosive or ignitable. CLASS II (NEC-500-4): Those […]Read more
Heat Dissipation in Electrical EnclosuresSelection Procedure: Determine input power in watts per square feet by dividing the heat dissipated in the enclosure (in watts) by the enclosure surface area (in square feet). Locate on the graph the appropriate input power on the horizontal axis and draw a line vertically until it intersects the temperature rise curve. Read horizontally to […]Read more
BlackoutsWhat are they? Power failures, also known as blackouts, are the easiest power problem to diagnose. If the lights go out, chance are there has been a power failure. Any temporary, or not so temporary, interruption in the flow of electricity will result in a power failure which can cause hardware damage and data loss. […]Read more
BrownoutsWhat are they? Brownouts are periods of low voltage in utility lines that can cause lights to dim and equipment to fail. Also known as voltage sags, this is the most common power problem, accounting for up to 87% of all power disturbances. Where do they come from ? Overburdened utilities sometimes reduce their voltage […]Read more