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You could compare that to what happens when you have a traditional IS installation using the entity approach to justify IS barriers per device. The worst case is to have an IS barrier for each device, whether Div 1 or 2, Hubbell said."With the fieldbus networks on which you can hang the devices-Profibus blue and Foundation fieldbus-we could go back and re-evaluate the potential for explosion based on power supply and the FISCO model. Prior to having the two concepts, it put a burden on the end user; there was only one approach to solve the IS problem. And that led to him having to put in more hardware wiring. The cost was up."
NCTA max president Robert Sachs said, "[The] action is good for consumers, because it will hasten the day when ''digital cable ready'' television sets will reach the market, making it easier for cable customers to access digital television services such as high-definition television programming without the need for set-top boxes."However, the Satellite Broadcasting and Communications Association decried the ruling, claiming it would tie DBS companies to regulations and restrictions that they did not agree to; DBS companies were not parties to the negotiations.
The FISCO concept is an intrinsically safe (IS) apparatus for use on a bus-powered system. It''s based on the concept of the Manchester-encoded, bus-powered system in accordance with IEC 61158-2, the fieldbus physical layer standard. "It provides a way of getting more power into the measurement system you''re looking at for intrinsic safety," said Nick Ludlam, senior engineering specialist at Factory Mutual (FM) in Norwood, Mass. "For example, the equipment we''ve looked at could be a temporary 1 measurement device-process control equipment, U.S. for a Class 1, Zone O or Zone 1 and Class 1, Division (Div) 1. FNICO is the same except it''s for electrical equipment for use in Class 1, Zone 2 or Class 1, Div 2-safe and normal operation. Manufacturers are asking approval companies such as FM to look at the FISCO and FNICO concepts because they can get more power into the system and it''s easier for the end user to be able to connect into the systems. "They don''t have to look at more of the parameters," Ludlam said/They just connect it in."
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