So... then the next tautology is then introduced: the sizing of the capacitor should be chosen to have a value where Z = 1 / (2πFC) is equal to 1/2 R (the cathode resistor value). It is up to you to choose the value for F (frequency). This is part of your design criteria.
Some pad mounted capacitor and harmonic filter banks may not require medium voltage cable if they are supplied with a bushing entry option. For these banks, bare, or 600 volt conductor may be used.
A capacitor is properly sized when its full load current rating is 90% of the no-load current of the motor. This 90% rating avoids over correction and the accompanying problems such as overvoltages. Go to Content ↑ 1. If no-load current is known
This article gives the full rundown on choosing a cathode bypass capacitor. Of note is that you are bypassing the parallel combination of the tubes cathode resistance and the cathode resistor giving the low frequency gain shelf. This means a bigger cap for a given cutoff than the bias resistor alone would indicate.
As a general rule the correct size of capacitor for individual correction of a motor should have a kvar rating not exceeding 85% of the normal No Load magnetizing KVA of the machine. If several motors connected to a single bus and require power factor correction, install the capacitor (s) at the bus.
NEC code article 460 stated that “The ampacity of capacitor circuit conductors shall not be less than 135 percent of the rated current of the capacitor” this means that: Some manufacturers recommend that the Power conductors must be oversize to carry continuous current of at least 1.5 times the rated capacitor current at a temperature of 50˚C