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Series C:
Reference Charts for Determining Runway Specifications

The following table is figured for 220V and 440V, 3 phase, 60 cycle AC motors with a 5% loss and is based on the formula:

Volts Lost = 1.73 x ampere load x resistance factor x length of conductor in feet from the powerfeed
  Max. length from feed at 5% drop
  220V 440V 575V
SAF-T-BAR
Cat. No.
Impedance
factor AC
Amp rating
cont. duty
Full continuous load
(in amperes)
CA 90 .00138 90 51 feet 102 feet 135 feet
CA 110 .00097 110 60 feet 120 feet 155 feet
CA 250 .000131 250 195 feet 390 feet 500 feet
CA 300 .00011 300 192 feet 384 feet 530 feet
CA 350 .00008 350 227 feet 454 feet 600 feet
NOTES:
  1. Center feed doubles runway length.
  2. Less than full amp. load increases maximum distance for powerfeed.

    eg 40 amps in CA90 bar at 440V: 90A/40A x 102 ft. = 230 ft.

  3. Higher voltage than shown increases maximum distance from powerfeed

    eg. 80 amps in CA90 bar at 480V: 480V/440V x 102 ft. = 111 ft.

  4. High voltage loss allowance by motor manufacturer increases maximum distance from powerfeed

    eg. if 10% loss is allowable then maximum distance from powerfeed is twice the distance indicated in the table above, which is based on a 5% allowable loss