Companies invest in additional back-up equipment for sensitive equipment, which adds to the demand on the power supply and are sensitive to   ?   in the system.

Voltage phasors, or vectors, are separated by   ?   degrees in a normal three-phase power distribution system.

A   ?   is a decrease from the nominal voltage supply level.

The three electrical theory laws: Ohm’s Law, Kirchoff’s voltage law and Kirchoff’s current law, are used to trace the   ?   of most PQ-related problems.

Which of the five scenarios identified by NIOSH that describe the incidents resulting in 244 fatalities had the highest percentage for workers in the electrical industry   ?  .

The use of proper personal protective equipment is intended to reduce or prevent   ?  .

What single activity was identified as being performed when an accident occurred?

A 3% voltage imbalance between phases may result in the need to de-rate electric motors by   ?  .

Both voltage unbalance and harmonics are generally considered as   ?   power quality problems.

A power quality instrument should be rated for the anticipated range of   ?   and   ?   levels.

When accurate measurements are needed on sinusoidal waveforms to detect   ?  , only true RMS meters should be used.

Sub-quarter-cycle changes in the wave shape which usually do not trigger an RMS variation are defined as what?

When performing a PQ analysis, monitoring to establish a benchmark should be conducted for at least   ?   to get a more complete picture of the electrical supply.

If harmonic distortion was found to be noticeably larger on a single phase when compared to all phases, during a PQ study and analysis; what would an intuitive cause be for the increase in total harmonic distortion (THD)?

The   ?   of two improperly-made ground connections causes current to flow in a ground loop path, with possible noise and/or component failures.

When measuring equipment efficiency, monitoring should be conducted   ?  .

What is the likely direction or source of the fault condition if the current increases significantly when the voltage decreases?

Improperly grounded communication cables between peripherals and the mainframe computer may become a problem when exposed to strong level RF signals through all of the following except   ?  .

Well-grounded, properly-sized UL listed   ?   should be installed on any metallic interface that extends outside a structure, including the incoming electric service, phone lines, and any exterior branch circuits.

On a single-phase circuit, the origin of a voltage sag is usually   ?   if the neutral-to-ground voltage increased significantly during the sag.

Sag is the sum of   ?   in both the line (hot) and neutral (grounded) wires.

A single phase, rectified input, switching power supply will have a sharp   ?   in current at the beginning of a sag, followed by an increase in current to a value greater than the original current level, until the sag has ended or the equipment trips off line.

Learning which mitigation solutions will work for which power quality phenomena can be studied from the   ?   side or the   ?   side.

All of the following are classifications for PQ phenomena except   ?   conditions.