Search By Part Number	CATALOG MAIN PAGE -- CONDUIT SYSTEMS -- Standard Convolution, Standard Wall Conduits. Extra Flexible Convolution, Standard Wall Conduits. Extra Flexible Convolution, Thin Wall Conduits. Extra Flexible Convolution, Standard Wall Conduits With ...  - Phosphor Bronze or Stainless Steel Wire Overbraid  - Tinned Copper Wire Braid and Overbraid of Nomex or Dacron  - Tinned Copper and Phosphor Bronze Wire Braid, with Elastomer Outer Sheath -- CONDUIT ADAPTORS AND TRANSITIONS -- Male and Clamp Adaptor Assembly Female Adaptor Assembly Connector Adaptor Assembly Female Adaptors Elbows Connector Adaptors Elbows Bulkhead Adaptors Transitions Fittings for special applications -- TECHNICAL INFORMATION -- Material Properties of Sunflex Conduits and Elastomer Jackets Conduit Part Number Breakdown MIL-T-81914/X-XXXX Conduit Fittings Electromagentic Compatibility (EMC) Conduit Size Calculator Electromagnetic Compatibility (EMC) Electromagnetic radiation is to electronics what the black plague was to civilization in the Middle Ages. The electromagnetic compatibility of a system is determined by the system's integrity and functioning compatibility in an enviroment of electromagnetic radiation. This electro magnetic radiation, known as EMI (electromagnetic interface), is generated by two primary sources: natural and man made. Natural EMI stems from thunderstorms, solar emissions, wind stoms, lighting discarges, etc. Man made EMI may be intentional or or unintentional. Unintentional EMI arises from the use of electric motors, ignition systems, generators, faulty electrical systems, etc. Intentional EMI is usually offensive, and is generated by radar and radio jamming systems, or nuclear explosions (which creates a form of EMI known as EMP: electromagnetic pulse). To safegaurd an electrical system or circuit, a barrier or shield must be placed between it and the source of interference. With wiring harnesses, this shield can take the form of a metallic conduit, usually brass, with suitable fittings attached to the conduit and connector. Such a system effectively shields the enclosed wiring by receiving the interference and directing it harmlessly to ground. While effective, this system will not stand high vibration or constant flexure, as the conduit fatigues and brakes apart. This reduces its shielding ability to almost zero. Allthough Sunflex offers this type of metal conduit for relatively static applications (MIL-C-13909), we recommend our convoluted plastic conduits for high vibration, flexure applications. Effective shields are provided by the use of overbraids of a variety of materials to give the maximum shielding for each specific applicatoin. these conduits have an extremely high flexure lifeand will not withstand continuous high frequency vibrations with no ill effect. There are two primary methods for measuring the electromagnetic compatibility (EMC) of a wiring harness 1. Shielding Efficiency. This measurement is performed by using the wiring as an antenna to emit radiation, and measuring that radiation. Then a shield is applied over the wire, and the radiation (or field strength) is remeasured. The results are expressed on a logarithmic scale, in decibels as: Shielding Efficiency = 20 log Field strength before shielding Field strength after shielding 2. Transfer Impedance. () This is the ratio of the voltage induced on the inner surface of a shield system, to the current flowing on the exterior surface. The results are expressed as ohms per meter. = Voltage Interior Current exterior Of the two methods, the transfer impedance method is preffered. it is more positive and not susceptible to other variants (connector quality, screenroom efficiency, etc.). Transfer impedance testing methods are defined in MIL-C-85485. The graphs below show average transfer impedance for a selection of standard Sunflex braid patterns. Single layer braid of tinned or nickel, copper wire .0063 Dia. Double layer braid of tinned or nickel, copper wire .0063 Dia.