By B J Elliott
This publication is a pragmatic layout guide for dependent cabling and explains the terminology and physics in the back of the proper criteria, what the acceptable criteria are, how they healthy jointly and the place to procure them. Designing a dependent cabling process to ISO 11801 second variation is the 1st ebook to offer a statement at the most modern layout normal for established cabling: ISO 11801: details expertise - time-honored cabling for client premises, second variation 2002 an individual utilizing this booklet could be capable of learn and comprehend this new edition of the normal and all of the different suitable criteria and relate their standards to the brands' info sheets and their, usually conflicting, claims. It offers transparent and potent solutions to the issues raised by means of the necessity to layout, procure, set up and textual content a latest cabling approach, utilizing either copper and optical fibre cable know-how. The e-book not just deals a step by step consultant in the course of the new normal but in addition pass references all different proper foreign, eu and American criteria together with EN 50174 (Europe) and ANSI/TIA/EIA-568-B (USA). This ebook is meant as a source for IT managers, specialists, cable set up engineers and procedure designers who have to comprehend the know-how of cabling platforms and the tremendous panoply of criteria that control them.
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Extra resources for Designing a Structured Cabling System to Iso 11801 Second Edition: Cross-referenced to European Cenelec and American Standards
Totally non-metallic optical cables are more popular in data communications applications whereas longer distance telecommunications applications are still content to use metallic construction optical cables. 46 Designing a structured cabling system Individually coloured fibres Polyethylene sheath Resin bonded glass central strength member Water blocking tapes or threads 6 gel filled tubes helically stranded around the central strength member typically up to 24 fibres per tube Fig. 13 Non-metallic loose tube optical cable.
In addition, the polyethylene sheath is usually carbon loaded to improve UV resistance and this is why most external cables are black. Unfortunately polyethylene and petroleum gel are very flammable and most countries prohibit their use within buildings, insisting upon their termination to indoor grade cables within 15 m of entering the building. Failing this the cables must be entirely contained within a metal conduit. Forming a transition joint between internal and external cables has never been seen as much of an issue with copper cables.
Another option is, of course, to use the lead-sheathed cable. Oil/chemical resistant cables. There are a wide variety of materials that have a greater resistance to solvents than can be obtained from day-to-day materials such as PVC and polyethylene. Nylon provides one of the cheapest means of obtaining oil and chemical resistance. Applications in places such as coal mines and oil rigs need cables that are resistant to solvents ranging from sea water to hydraulic fluid. A resistance to ozone and UV light may also be needed, as is a requirement to maintain flexibility across a wide range of temperatures.