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Differential Mode Noise
Describes noise which occurs between the live and the neutral conductors. Caused by load switching locally.

A transient voltage decrease.

Difference between the actual ac voltage waveform delivered and an ideal sine wave.

EMI – Electro-Magnetic Interference
Electrically induced noise or transients.

An electronic device that allows only certain frequencies to pass.

Float Charging
A battery charging system suitable for UPS batteries. A float charger maintains a voltage on the battery, known as the float voltage, which is the ideal voltage for the battery and maximises battery life. At float voltage, a current flows into the battery which exactly cancels the battery’s internal self discharge current.

Ground Fault
An undesirable connection that allows current to flow from a conductor to ground.

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