Is a Passive Harmonic Filter wired in series or parallel to the load?

Active Harmonic Filter Frequently Asked Questions 

Passive Harmonic Filters are wired in Parallel to the load.  The load must be de-energized if the passive filter needs to be replaced or repaired.

HPS Centurion P Passive Harmonic Filter

Learn More about HPS Centurion™ P Passive Harmonic Filters