 |
|
|
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:
- Center feed doubles runway length.
- 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.
- Higher voltage than shown increases maximum distance from powerfeed
eg. 80 amps in CA90 bar at 480V: 480V/440V x 102 ft. = 111 ft.
- 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
|
|
|
|
