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.
A test that is used to determine the increase in operating temperature at a given load.
Wrapped in a spiral fashion. Refers to the way the strands of a conductor are laid.
The meter-kilogram-second unit of inductance, equal to the inductance of a circuit in which an electromotive force of one volt is produced by a current in the circuit which varies at the rate of one ampere per second.
1) A unit of frequency equal to one cycle per second. 2) In alternating current, the changing of the negative and positive poles.