Switchboards for power, light and railway service, direct and alternating current, high and low tension . of vital importance;that is, we must not make the connections such that theydo not fully accomplish all that is desired. Now, it mayhappen that we have a building in which it is desired toarrange the circuits so that the current may be turned offa certain portion at a certain hour and that we be able toturn it off from the switchboard. If such be the case, theconnections must be such as to enable us to accomplish theresult. Again, it may be required to control the lights inseveral parts of
Switchboards for power, light and railway service, direct and alternating current, high and low tension . of vital importance;that is, we must not make the connections such that theydo not fully accomplish all that is desired. Now, it mayhappen that we have a building in which it is desired toarrange the circuits so that the current may be turned offa certain portion at a certain hour and that we be able toturn it off from the switchboard. If such be the case, theconnections must be such as to enable us to accomplish theresult. Again, it may be required to control the lights inseveral parts of the building from the board, and theswitches and connections must be so made that we cancontrol them. ]\lany other reasons may arise that willinterfere with the simplification of the switchboard to thegreatest possible extent: therefore, it is necessary to knowhow to proceed when complicated cases present them-selves, and the best way to reach this proficiency is by thestudy of arrangements calculated to meet more or lesscomplex requirements. Figs. 21 and 22 are cases of this kind, and being ar- 43. 4 6 6a b c ^0 o o o a b c nO 6 0 oc b a Octc b aOn Fi-uv Tlie Derry CMard Co. Four generators in parallel to feed a number of circuits. 44 Another combination of four. ranged differentl}-, a study of them will serve to throwlight upon the subject, and to enable us to decide whatcombinations can be n:ost advantageously applied in anyparticular instance. In Fig. 21 four generators are provided to feed intofour external distributing systems, and they are so ar-ranged that any one of the generators can be connectedWith any one of the distribution systems. The way inwhich all this is accomplished can be made clear by theexplanations that follow :— The four generators G^, , G.,, G^ are connected withthe four switches S^^, , 6\, S^, respectively. The wiresmarked g leading from the center contacts of the switchesconnect with the bus marked 5. Bus 6 is the equalizingbus. and it wil
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1906
