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Tuesday, April 10, 2012
Friday, March 2, 2012
Leviton 390-1W Medium Base, Bi-Pin, Standard Fluorescent Lampholder, Pedestal, Screw Mount, Turn-Type, 2-Screw Terminal, White
!±8± Leviton 390-1W Medium Base, Bi-Pin, Standard Fluorescent Lampholder, Pedestal, Screw Mount, Turn-Type, 2-Screw Terminal, White
Brand : Leviton | Rate : 
| Price : $2.39
Post Date : Mar 02, 2012 15:48:39 | Usually ships in 24 hours
| Price : $2.39Post Date : Mar 02, 2012 15:48:39 | Usually ships in 24 hours
Leviton 109-390-1WH Fluorescent Lampholder, White Leviton 109-390-1WH Fluorescent Lampholder, White Features: Medium bi-pin, screw terminal Easy to wire Lamp locks in place For use with 14 to 20 watt fluorescent Furnished with mounting screw and nut 600 volts 660 watt White Body 1" wide, 1-7/16" at base x 2-7/16" overall height
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Wednesday, February 29, 2012
Leviton 9063 Medium Base, One-Piece, Keyless, Incandescent, Phenolic Lampholder, Pony Cleat, Single Circuit, Open Terminal, Brown
!±8± Leviton 9063 Medium Base, One-Piece, Keyless, Incandescent, Phenolic Lampholder, Pony Cleat, Single Circuit, Open Terminal, Brown
Brand : Leviton | Rate : | Price : $3.71
Post Date : Feb 29, 2012 12:15:28 | Usually ships in 4-5 business days
| Price : $3.71Post Date : Feb 29, 2012 12:15:28 | Usually ships in 4-5 business days
- Medium base
- One-piece
- Keyless
- Incandescent
- Phenolic lampholder
More Specification..!!
Leviton 9063 Medium Base, One-Piece, Keyless, Incandescent, Phenolic Lampholder, Pony Cleat, Single Circuit, Open Terminal, Brown
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Sunday, February 26, 2012
Solderless Electrical Terminal Assortment - 160 Pc
!±8± Solderless Electrical Terminal Assortment - 160 Pc
Rate :
| Price : $8.55 | Post Date : Feb 26, 2012 08:49:07Usually ships in 1-2 business days
Set includes: 10-12ga: ring terminals 55-5 4pc, 55-8 4pc, 55-10 4pc, male connect 5pc, female disconnect 5pc, butt connector 12pc. 16-14ga: ring terminals 2-6 10pc, 2-5L 10pc, 2-4L 10pc, bullet male connect & female disconnect 10pc each, spade terminal 2-4M 10pc. 18-14ga: butt connector 18pc, quick splice 4pc. 22-18ga: ring terminal 1.25-4 8pc, quick splice 4pc, butt connector 12pc. Includes handy re-sealable organized-by-size see-through case.****
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Thursday, January 19, 2012
Static Dissipators and Grounding Towers For Lightning Protection
While the incidence of lightning strikes varies, virtually all populated regions have some lightning exposure hazard. Taken over the lifetime of typical tower and antenna systems, there is meaningful risk worldwide, and it makes sense to at least minimally protect facilities outside of "lightning belts". In areas of intense lightning risk, extreme protection measures are mandatory!
The largest classes of technical structures needing lightning protection in the world today are wireless communications and broadcast towers and their antennas.
In less than 20 years, cellular mobile towers have proliferated on every continent, and are perfect lightning targets! To a lesser extent, AM, FM, and TV towers have also sprouted, sometimes sharing with cell systems. Not only are the towers at lightning risk, but also the cellular, broadcast, and communications antennas mounted on them. At risk too, are the attached cell site equipment, radio transmitters, coaxial cables, and tower light systems.
There are a wide variety of lightning air terminals in the form of lightning dissipators. Sometimes called a dissipator, or static dissipation array, this relatively new and advanced air terminal replaces conventional lightning rods in most applications. It functions as a streamer retarding air terminal.
Static dissipation array generically describes a system using point discharge phenomenon to protect towers and antennas and the area around them from a lightning strike. These function, as the name implies, by dissipating static electrical charge. Among design factors, the radius of the dissipator electrode cross-section is critical because the process which enables dissipation of static ground charge to the atmosphere is related to electric field intensity (and flux density) surrounding the lightning dissipator. Static dissipation arrays provide, in effect, a "low resistance" route for static ground charge to reach the atmosphere, thus preventing a build up of the ground charge to the value necessary to trigger a strike on the protected object.
Since a dissipation system must provide a low resistance path to the atmosphere, it seems logical to provide as many discharge points as reasonably possible. By using a large number of air terminal points one can compensate for any loss of efficiency from a theoretical maximum, and spread the dissipator elements over more of the cross-section area of the tower or antenna structure.
All objects have natural dissipation points. On a tower structure, charge tends to gather at, and dissipate from the tower top, antennas and antenna mounts, and from corners. The most effective way to mount a dissipator in terms of structure, weight, wind loading, cost and aesthetics is to enhance this natural dissipation by supporting the unit from the structure itself at these natural dissipation points. Since most antenna and tower structures are steel, direct attachment provides excellent conductivity. As a practical matter, the array configuration should be tailored to the structure, not vice versa.
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