Cyclopedia of heating, plumbing and sanitation; a complete reference work . laced as near as possible to the rising chases, inorder to shorten the feeders and mains supplying them. Having determined the system and method of wiring, the locationof outlets and distributing centers, the next step is to lay out the branchcircuits supplying the various outlets. Before starting to lay out the branch circuits, a drawing showingthe floor construction, and showing the space between the top of thebeams and girders and the flooring, should be obtained from the Archi-tect. In P proof buildings of iron or
Cyclopedia of heating, plumbing and sanitation; a complete reference work . laced as near as possible to the rising chases, inorder to shorten the feeders and mains supplying them. Having determined the system and method of wiring, the locationof outlets and distributing centers, the next step is to lay out the branchcircuits supplying the various outlets. Before starting to lay out the branch circuits, a drawing showingthe floor construction, and showing the space between the top of thebeams and girders and the flooring, should be obtained from the Archi-tect. In P proof buildings of iron or steel construction, it is almostthe invariable practice, where the work is to be concealed, to run the 321 32 ELECTRIC WIRING conduits over the beams, under the rough flooring, carrying thembetween the sleepers when running parallel to the sleepers, and notch-ing the latter when the conduits run across them (see Fig. 31). Inwooden frame buildings, the conduits run parallel to the beams andto the furring (see Fig. 32); they arc also sometimes run below the Finished FloorN. Pig. 31. Running Conductors Concealed under Fluor In Fireproof Building. beams. In the latter case the beams have to be notched, and this isallowable only in certain places, usually near the points where thebeams are supported. The Architects drawing is therefore necessaryin order that the location and course of the conduits may be indicatedon tin plans. The first consideration in laving out the branch circuit is thenumber of outlets and number of lights to be wired on any one branchcircuit. The Rules of the National Electric (ode (Rule 21-1)) requirethat no set of incandescent lamps requiring more than 660 watts,whether grouped on one fixture or on several fixtures or pendants,will be dependent on one cut-out. While it would be possible tohave branch circuits supplying more than 660 watts, by placing variouscut-outs at different points along the route of the branch circuit, soas to subdivide it into small sec
Size: 2855px × 875px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthoramericanschoolchicago, bookcentury1900, bookdecade1900
