POWER REQUIREMENTS X-RAY Dis Couniec\ Tor proper operation of this x-ray unit at its full rated capacity of 100 ma at 100 kvp, the power supply must be within the rated voltage and frequency range and must be of sufficiently good regulation that the /oltage drop under load does not exceed specified limita, The various factors which must be consider rd in the selection of power supply are discussed in paragraphs following: Voltage and Frequency: - This equipment is designed to operate from power lines which will deliver: 190 to 250 volts at 50-cy, or 60-cy., ro permit operation of the unit at full rated output, this power supply must meet the requirements of the ‘ollowing paragraph, If it does not, the maximum output demand should be reduced. ‘oltage Drop: - vhenever a load is thrown on a power supply, a voltage drop takes place, the magnitude of whichis a inction of the regulation of the power supply, It 1s convenient to measure the ability of the power supply o properly supply the full load demand of the x-ray machine by measuring the voltage drop which takes lace when the unit is operated at 50 ma, 80 kvp. At this load, the permissible exposure time is suffi ‘ently long to permit accuratereading of the control voltmeter. o determine the adequacy of a given power supply, the x-ray unit must be installed and tested as cov -ed in paragraphs 7? through 10 of the Installation Section and in paragraphs 7 and 8 of the Testing and djustment Section. “epcommended Pewer Supply: - power supply is to be installed to meet the requirements of the x-ray unit, the following is recommend i, Such power supply will provide for operation of this x-ray unit under Line |] and Line 2 conditions, Power Transformer Line Safety Switch, 10 kva double pole Line Safety Fuses 250-v, 250-v, 60 arnmp WIRE DISTANCE FROM POWER TRANSFORMER TO LINE SWITCH 60-amp SIZES Wire AWG Inches Diameter Millimeters r Line Voltage of 190 to 250: Feet 0-50 51-150 ' $1-2060 Meters ‘ 0-15 15.1-46 46,1-6! #6 #2 #1 05 25 . 30 4.0 6.5 7.5