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=== appliance ===A non-lighting item that, by its resistance, consumes electricity rather than just passing it on.=== harmonic ===A multiple of the fundamental electrical frequency. Harmonics are present whenever the electrical power waveforms (voltage and current) are not pure sine waves.=== high voltage ===Voltage greater than 100,000 volts.=== IEC ===International Electrotechnical Commission.=== IEEE ===Institute of Electrical and Electronics Engineers.=== megohmmeter ===An instrument for measuring insulation resistance.=== NEC ===National Electrical Code.=== NEMA ===National Electrical Manufacturers Association.