196 POWER-HOUSE DESIGN 



Electrical apparatus must be stored in a dry place and kept 

 above the freezing-point. The best arrangement is an electric 

 heater which is large enough to keep the storage building above 

 freezing and arranged so that the temperature will always be 

 higher than that outside. Great care should be taken to prevent 

 fires. In the majority of cases a responsible watchman on duty 

 at all times is the best insurance against fire and thieves. 



Schedule of Erection, A careful schedule of the erection 

 work should be made to insure rapid, efficient work and prevent 

 congestion. At least part of the building steel and the crane 

 should be erected before any of the heavy machine parts are 

 delivered. The delivery of water wheel parts should be arranged 

 for in the order required and with sufficient time allowance to 

 permit of the assembly work keeping step with the wheel pit 

 construction. 



On large installations space and equipment must be provided 

 for the necessary assembly of the machine parts before they are 

 placed in their final position. Any convenient open space under 

 the crane, and centrally located in regard to the final location will 

 do for the wheel parts. 



The generators must be protected from the weather and from 

 the dirt, smoke and cement dust usually present during the build- 

 ing construction. In the case of large generators it is often 

 necessary to assemble the punchings and wind the armatures on 

 the ground. This is best handled in a temporary house, under a 

 crane. The roof can be made in sections, with eyebolts, to per- 

 mit easy removal with the crane and the handling of the armature 

 sections. This temporary building will protect the machines from 

 dirt, moisture and mechanical injury. The winders will also do 

 more and better work when protected from the noise, confusion 

 and dirt of the power-house under construction. 



In most cases the coils must be warmed before using. Where 

 this is necessary, convenient heating ovens should be made part 

 of this temporary house. These ovens should contain wooden 

 racks for holding the coils, and steam coils or electric heaters 

 under the racks for supplying the heat. In general the ovens 

 should range from 150 F. to 200 F. and should be large enough 

 to permit of coils being heated several hours. A little care in 

 arranging the ovens for the ready placing of cold and removing of 

 hot coils will affect materially the speed and costs of the winding 



