FAQs - Electrical Distribution Systems

Electrical distribution system related information including branch circuits and sub-distribution.

Amp or Amperes (A) are a measure of electrical current flow.

Alternating Current (ac) is an electrical current whose electrons flow periodically in one direction to a maximum level before dropping back to zero and then flowing in an alternative direction before the pattern repeats itself. The waveform is that of a sinewave.

Current Limit is the restriction of the amount of current that can be drawn from any point within an electrical circuit or UPS output.

A Three-Phase supply is an electrical supply consisting of three single phases, each 120º out of phase from one another.

Branch Circuits are circuits run on individual breakers from the mains distribution board.

An Emergency Power Off (EPO) / Emergency Shutdown (ESD) is a signal contact on a UPS which will initiate a total UPS shutdown.

An Earth Fault Ground is a connection from the live component of a mains power supply to an earth connection.

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