By B. Ribgy
Electric prone are a necessary and expensive part in any sleek development. it really is crucial that building pros comprehend the elemental ideas of companies layout. For the recent variation of this good proven publication 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 e-book describes equipment of layout with examples of calculations and strategies of deploy.
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Extra resources for Design of Electrical Services for Buildings (1998)
To achieve rewirability, draw-in boxes must be accessible from the surface, or in other words their covers must be flush with the finished surface. The covers can then be removed without any cutting away of plaster or brickwork. In addition, the length of conduit between successive draw-in boxes should not exceed about 10 m and there should not be more than two right angle bends between successive boxes. A further requirement is that the bends themselves should be made with as large a radius as the position of the conduit within the building permits.
The final connection to machines and mechanical equipment such as pumps, boilers, fans, fan heaters, workshop equipment and so on is usually made in flexible conduit. The fixed wiring terminates in a box either in the wall near the equipment to be connected or on the surface of the wall, and from this box a short length of flexible conduit is taken to the equipment. Very often the machine is delivered to the site after the electrician has done the bulk of the work. At the time of installing the wiring, the position of the terminals on the machine is not known and so the outlet box can only be placed to within a foot or so of its exact position.
Moisture can occur through water getting in during building operations and also later on through condensation of moisture in the atmosphere. A conduit system must be laid out so that it is well ventilated, which will prevent condensation, and so that water which does get in will drain to one or more low points at which it can be emptied. It is good practice to swab through the conduit after it is erected and before cables are drawn in to remove any moisture and dirt which have collected. This is simply done by tying a suitable size of swab on the end of draw wire and pulling it through the conduit from one draw-in box to the next.