A voltage stabilized Power Supply controls the voltage across its output terminals. Hence, the wire conductors used to connect the load must be considered as part of the load. At high load currents, the voltage drop across the supply leads may appreciably degrade stabilization of the load. Kepco models equipped with the remote error sensing feature can automatically compensate for voltage drops of up to 500 mV across each load supply lead. |
To use this nomograph, first click on the Nomograph and print out a hard copy, then follow the directions below.
This Nomograph can be used to find:
Voltage drop in millivolts per foot for known wire size and operating current:
Maximum current carrying capacity recommended for any standard wire size (Based on an arbitrary minimum 500 circular mils per Ampere. High temperature class insulation will safely allow higher currents.)
- With a straight edge, connect the known current on scale 1 and the wire size on scale 2.
- Read voltage drop on scale 3.
Wire size required for known operating current and known maximum tolerable voltage drop across supply leads
- With a straight edge, connect from the wire size on Scale 2 to point "A" on Scale 3.
- Read Imax on Scale 1.
- Determine maximum tolerable drop in millivolts
per foot of lead (sum of positive and negative leads).
- Connect the value on Scale 3 (as determined in step 1.) to the known current on scale 1.
- Read wire size on Scale 2.