ballast

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ballast

1. any dense heavy material, such as lead or iron pigs, used to stabilize a vessel, esp one that is not carrying cargo
2. crushed rock, broken stone, etc., used for the foundation of a road or railway track
3. Electronics a device for maintaining the current in a circuit

Ballast

Power-regulating device that modifies input voltage and controls current to provide the electrical conditions necessary to start and operate gaseous discharge lamps, especially fluorescents and HID (high-intensity discharge) lamps.

ballast

[′bal·əst]
(aerospace engineering)
A relatively dense substance that is placed in the cab of a balloon and can be thrown out to reduce the load or can be shifted to change the center of gravity.
(civil engineering)
Crushed stone used in a railroad bed to support the ties, hold the track in line, and help drainage.
(electricity)
A circuit element that serves to limit an electric current or to provide a starting voltage, as in certain types of lamps, such as in fluorescent ceiling fixtures.
(materials)
Coarse gravel used as an ingredient in concrete.
(naval architecture)
A relatively heavy material such as lead, iron, or water placed in a ship to ensure stability or to maintain the proper draft or trim.
To pump seawater into empty fuel tanks of a ship to ensure its stability or suitable draft and trim for seaworthiness.

ballast

1. Coarse stone, gravel, slag, etc., used as an underlayer for poured concrete.
2. A device used to provide the required starting voltage and operating current for fluorescent, mercury, or other electric-discharge lamps.
3. Class P: A ballast for a fluorescent lamp which meets the requirements of the Underwriters’ Laboratories, Inc.; includes an automatic resetting thermal protector to remove the ballast from the circuit if its temperature exceeds a specified value.

ballast

Weight installed in an airplane to ensure that the center of gravity is always within the permissible limits. In some aircraft, fuel is used as a ballast. This fuel, however, cannot be burned by the aircraft.
References in periodicals archive ?
The following formula is used to calculate the efficiency of Fluorescent Lamp Sign Ballasts according to DOE standards, which is based on ballast luminous efficiency (BLE) calculations.
We lighting engineers on the New York Mayor's Green Task Force Lighting Subcommittee were aware of the problem back in 2008 when the committee was formed and made the following suggestion: "Fluorescent fixtures installed prior to 1981 have magnetic ballasts that contain PCBs, a hazardous material.
has developed an innovative new ballast with the aim of expanding daylight harvesting, into mainstream lighting applications.
Multiple ballasts sharing a single power circuit can be independently zoned and controlled, and both ballasts and zones may be reconfigured with ease, even after a system has been installed.
This means that there are many DEHP-contaminated landfills that need clean-up sponsors, and disposal of DEHP ballasts at one of these landfills could make the disposer a potentially responsible party to a clean-up action.
Fastenal is an industry leader that shares our goal of helping the customer save money while still creating operational efficiencies with minimal environmental impact," said Kevin Adams, chief executive officer of Green Ballast.
In addition to integrating many features for maximum programmability and protection, the IRS2168D provides a wide range input to address the challenge of designing complex multi-lamp electronic ballast circuits, rounding out our portfolio of non-dimmable fluorescent ICs," said Stephane Ernoux, IR product manager.
Performing the complete lighting upgrade for the eleven Shelby County Schools is an example of Green Ballast being a total solution provider of complete lighting upgrades," said Kevin B.
The Axis ballasts helped the Alliance Center become one of only two buildings in the world to have earned two LEED Certifications--Gold for Existing Buildings, and Silver for Commercial Interiors," stated Aaron Nelson, Project Director and LEED accredited professional for existing buildings.
By working with Green Ballast on a complete lighting upgrade and implementing their daylight harvesting technology, we expect to save approximately 45% in our lighting utility costs.
Axis has already received UL approval for its 120 & 277 volt DDH ballasts released in the United States and the company anticipates they will also receive approval for their 347-volt model built primarily for the Canadian market.
This report analyzes the worldwide markets for Lighting Controls in US$ Million by the following Product Segments: Ballasts (Magnetic Lighting Ballasts, & Electronic Lighting Ballasts), and Controls (Relays, & Breakers).