By B. Ribgy
Electric companies are an essential and dear part in any glossy development. it really is crucial that building pros comprehend the elemental rules of companies layout. For the hot version of this good verified booklet the writer offers a uncomplicated grounding within the layout of electric companies. all through, the emphasis is at the wishes of the layout engineer and the ebook describes tools of layout with examples of calculations and methods of deploy.
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Extra info for Design of Electrical Services for Buildings (1998)
With type p protection the enclosure of the equipment contains air or an inert gas at a pressure sufficient to prevent the surrounding vapour entering the enclosure. Since no enclosure is completely vapour tight there must be some leakage out of the enclosure. Equipment suitable for this method of operation must be capable of withstanding the necessary internal pressure, and must be connected to a network of compressed air or gas which contains a low pressure switch to disconnect the electrical supply in the event of loss of pressure.
Equipment designed for use in hazardous areas is itself classified according to the method used for achieving protection. Each type of protection is referred to by a letter. Type d refers to equipment with a flameproof enclosure. The principle adopted with this type of protection is that a spark inside equipment should not cause fire outside it. It is not practicable to design equipment so that no air or vapour can get inside it. It is however possible to design it so that the air gaps between inside and outside are so narrow and so long that any flame starting inside will be extinguished before it has travelled to the outside.
The protection against mechanical damage given to cable is somtimes part of the cable itself, as with PVC insulated PVC sheathed cables, and sometimes part of the method of installation, as with conduit systems. It can be more confusing than helpful to take a logical scheme of things too rigidly, and rather than deal with protection in a chapter of its own we are dealing with it partly in the previous chapter and partly in this, according to whether it is associated with the cable or with the method of wiring.