. Electrical instruments and telephones of the Signal corps . 180 ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS. Figure 108 illustrates an ideal installation of the central officeai)paratus where direct current is available. A detail drawing of thecharging j)anel shown is given in figure 18, chapter TI. These i^anels are intended for installation at about 18 inches fromthe wall, as indicated on the figures. The leads from the switch-jjoards and the post power should be brought up from the floor inloricated conduit fastened to the wall, e\en with the bottom of thepanel; from this point the lea
. Electrical instruments and telephones of the Signal corps . 180 ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS. Figure 108 illustrates an ideal installation of the central officeai)paratus where direct current is available. A detail drawing of thecharging j)anel shown is given in figure 18, chapter TI. These i^anels are intended for installation at about 18 inches fromthe wall, as indicated on the figures. The leads from the switch-jjoards and the post power should be brought up from the floor inloricated conduit fastened to the wall, e\en with the bottom of thepanel; from this point the lead sheath is removed and the wires arecarried over to the connecting lugs on the rear of panel. Theexposed parts of the leads should be painted thoroughly with pre-servative i)aint. If the storage battery cabinet is near by the leads, itcan be carried directly co it; but if any considerable distance separatesthese apparatus their battery leads should be lead down to the floorand then to the battery cabinet in the same manner as to the Fig. 100.—Switcliboaril protcuiivc apimratus. heat coils anil liirhtnins arresters. As stated previously, lead covered cable should be used for the leads,the lead sheath being cut back at the end for coiniections. Wherealternating-current power circuits are installed care must be takento install both wires of the incoming power circuit in the sameloricated iron conduit. Instructions for installing the storage battery are given in Chapter11. Where the cells are installed in a cabinet, care should be takento erect the cabinet in a permanent manner, keeping in rear the weightto erect the cabinet in a permantMit manner. AVhere altei-nating current only is available, necessitating the in-stallation of a motor generator, this machine should if possible beinstalled in a closet nearby or in some place easily accessible from theswitchboard room. However, in case of necessity it can be installedin the switchboard room, as the noise when in operatio
Size: 1873px × 1334px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashingtongovtprin
