electricalscho

Wrapped in a spiral fashion. Refers to the way the strands of a conductor are laid.

A test that is used to determine the increase in operating temperature at a given load.

Categories defined by NFPA 70E-2004 to explain protection levels needed when performing tasks. The values range from 1 to 4. ATPV rated PPE is required for categories 1 through 4 as follows: 1- 4 cal/cm²; 2- 8 cal/cm²; 3- 25 cal/cm²; 4- 40 cal/cm².

The presence of harmonics that change an AC waveform from sinusoidal to complex. They can cause unacceptable disturbance to electronic equipment.

A sinusoidal component of the voltage that is a multiple of the fundamental wave frequency.