IEC (International Electrotechnical Commission) - Advisory organization that draws up international standards in the electrotechnical field.
Tolerance in % - Limit for allowable variations for a given quantity, expressed as a percent of the rated value.
Switching Transients - Rapid voltage peak up to 20,000 volts with a duration of 10mS to 100mS.
Frequency Variation - A change in frequency of more than 3 Hz.
Blackout - A zero voltage condition lasting for more than two cycles. Same as a power failure
Power source (alternate) - Backup source used in the event of a mains failure. The connection time and the duration of the source depend on the type of source used. (back)
Cell - The basic electrochemical unit used to generate or store electrical energy.
