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FOR MANAGERS AND OPERATORS 369
The only legitimate objection to locating machines of this kind in or adjoining the operating room lies in the possible vibration and noise or the weakness of the floor.
As a general proposition it may be said that any floor too weak to carry a machine of this kind is unfit to be the floor of an operating room. Vibration can be, to all intents and purposes, eliminated by means of felt, as per instructions under "Installation."
When practical, always set your motor generator out far enough from the wall so that you can walk all around it, and before your floor is put down have the conduits laid, so as to carry the connecting wires underneath the floor.
This is a little extra expense and labor, but in the long run it pays, and pays big.
If you do locate your generator in the basement it is a good plan to place it on a pedestal or platform raised some distance from the floor, particularly if there is any danger of the basement at any time containing water. The frame of the machine should be thoroughly grounded by means of a copper wire, one end of which must make good electrical contact with the frame and the other with a water pipe or the earth, as described under "Grounds," Page 259. Also select as light a spot as possible, if any daylight enters the basement.
If the machine is located in the basement, make your operating room leads of ample size. It won't cost much more, and there will be less waste. The size of the leads will, of course, depend on the amperage they are to carry, and their length. In this connection see Pages 42 and 45.
General Instruction No. 2. — Installation. As soon as a new machine is unboxed, the name plate should be carefully inspected. If it be a D. C. to D. C. machine, you have only to ascertain that the volts marked on the motor name plate correspond with your line voltage. If it be an A. C. to D. C. machine, then the volts, cycles and phase must agree with those of the circuit on which it is to be used. The name plate marking will also indicate the volts and amperes for the arc lamp, and due care should be taken that the amperage rating, as indicated by the name plate, be not exceeded to any considerable extent, except for short periods of time.
If the motor generator is mounted on a sub-base which it is, for any reason, necessary to dispense with, great care must be exercised that the motor and generator be perfectly