574 



ELECTRICAL EQUIPMENT 



ers, and where low-tension switching equipments and attendance 

 are required a small building must necessarily be installed. Such 

 a building can then contain also a repair shop, storage-battery 

 equipment for operating the oil switches, etc. The transformers 

 should be placed on concrete foundations of a sufficient height to 

 be clear of water, and the stations should further be well paved 



-.8 



-.9' 



-20 -10 10 202530 40 50 60 707780' 90 100 110 120" ISO 140 



Temperature Degrees 

 FIG. 365. Linear Expansion of Copper Bus-bars. 1 



and drained around the apparatus. Transfer tracks with a 

 truck will also be found very convenient when moving the appa- 

 ratus. Cement walks should be laid on that portion of the ground 

 where the operator is most apt to pass in his inspection trips and 

 work about the place. The oil piping to the transformers and 

 1 By courtesy of General Devices and Fittings Company. 



