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HellermannTyton's selection of wire management products allow users to neatly and efficiently manage wire and cable in many different ways.
Solid wall Pro-Duct wiring duct is designed for straight wire runs where breakouts are not required.
Standard slotted wall Pro-Duct features break-away fingers which provide additional access for wire leads. Each section of the duct is provided with two score lines. The upper score line is used to break away fingers when a greater opening is required. The lower score line allows the sidewall to be smoothly cut for joints and "T's". Certain sizes of slotted wall wiring duct are available in intrinsic blue color. This indicates that the control panel is intrinsically safe - often required in applications where explosive gases exist. Contact HellermannTyton for details and specific sizes of intrinsic blue, slotted wall wiring duct.
High-density slotted wall Pro-Duct comes with narrow fingers, equaling a 2 to 1 finger ratio compared to standard slotted wiring duct. The narrow fingers reduce fanning of the wires to the terminal blocks fora neater appearance and to accommodate more compact designs and components in control panels, communications closets, and other applications.
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For the wiring of machines and system controls Siemens terminal blocks with Screw, Spring Loaded and Insulation Displacement Connections meet or exceed the requirements of CSA, IEC, NEMA, UL, VDE and other international Standards. Meeting these requirements, combined with worldwide acceptability and availability, enables Siemens terminal blocks to be used domestically; and, incorporated into equipment which will be exported.
Virtually all terminal block bodies are insulated on both sides eliminating the need for barriers and end plates. The materials used are ecologically harmless; e.g. cadmium-free, and without halogens or silicone. The terminals are finger-touch safe and cannot be installed onto a mounting rail due to their symmetrical design. In response to these trends Siemens has expanded existing and added new terminal block lines.
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Chalfant began supplying industry cable tray in 1948 and designed and developed its first RF Tray for NASA in 1960 when it became imperative to protect instrument and control cabling from EMI fields during missle launching. Over the past 30 years, Chalfant has developed both a Premium and an Ultra class RF Tray. The gasketed Ultra RF Tray has been successfully used at Sandia Labs, Los Alamos as well as military and other sensitive government facilities. Industrial and utility companies have found Chalfant's Premium RF Tray to be suitable because of the lower (long wave) EMI frequencies present in most of these applications.
EMC is the technology of minimizing the electromagnetic interference caused by electromagnetic fields that are radiated or propagated along a conducting medium and reducing the susceptibility of these fields on electrical or electronic devices or systems. EMC is a coordinated systems design approach consisting of:
RF cable tray has become the solution when source radiation or rerouting of cables is difficult or impossible. They have saved industrial plants many man-hours of tracking and correcting offending circuits during plant or process start-up and shakedown.
In addition, properly grounded and shielded RF tray not only reduces the radiated EMI fields a sensitive circuit sees but also provides an isolated ground reference which effectively reduces internal and circuit part coupling and overall mode coupling.
The consequences of inadequate shielding of critical cable runs can include:
RF Trays are designed to either contain or exclude EMI/RFI. A perfect design would be a one-piece tray and seam welded covers. However, this design is impractical as easy access to cables is necessary. Straight sections, covers and fittings must also be designed for easy installation in the field.
Low frequency magnetic fields are best attenuated by mass and material. Chalfants' Premium RF Tray has the capability to efficiently attenuate H fields in the 150 KHz - 10 MHz range from 70 to 83 dB.
E fields are effectively attenuated >114 to 90 dB at 1 MHz to 30 MHz. E fields below 1 MHz are attenuated over 100 dB. (See performance graphs.)
Chalfant's unique Ultra RF Tray has been designed with special cover clamps, splice plates, gaskets and foil. These features are essential for sealing and attenuating the plane wave frequencies 100 MHz through 1 GHz.
Special adjustable tension cover straps compress the cover seam gaskets for optimum shielding efficiency.
Pre-galvanized steel (ASTM 653A, G90 Coating) has proven to be the most cost effective tray material. Its flat, smooth surface is formable, weldable and conductive. It has excellent corrosion resistance. Coatings or painted surfaces are not conductive and work against shielding effectiveness.
Surprisingly the overall shielding effectiveness of RF Tray is determined more from the elimination of seams or gaps than from the mass or thickness of the materials used.
Chalfant builds its RF Tray to close tolerances so surfaces are flat and mate tightly.
Chalfant retained the services of a major Radiation Testing Lab (widely recognized for Tempest Certification) to certify the performance and shielding effectiveness of Chalfant's Premium and Ultra RF Cable Tray. A complete series of tests were conducted to MIL STD 285 using a production run of RF Tray with the following components: two 12" wide straight sections; one 12" radius horizontal fitting with gasketed bottom; one blind end; two wraparound splice plates; one panel adaptor, with covers; cover gaskets and foil tape and adjustable cover staps. The results of these tests are shown below.
Chalfant also field tested a large Navy project to 60 dB at 1,000 MHz. Over six test set-ups were required. The on-site testing was done to MIL STD 285 by another highly respected testing company. Slight modifications were made to Chalfant's original design to eliminate variables of controlled laboratory conditions and small sample size to the actual conditions encountered on the job-site. The new improvements were incorporated and retested at 400 and 1,000 MHz.
Chalfant encourages comparision and believes you'll find theirs is the only tray company that offers a proven, tested system that results in attenuation levels far above any competitor.
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