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Changes in the 2005 and 2008 National Electric Code call for installation of AFCI breakers on almost all branch circuits
Arcing faults can occur in series or parallel to the load. Parallel faults involve the greatest amount of energy and are more likely to create a fire hazard.
The AFCI is designed to prevent electrical fires that may result from normal wear and tear or aged connections.
Some loads produce arcing during normal use, the AFCI must distinguish between the load arc and an arcing fault.
Builders will consolidate construction activity to achieve efficiencies in all steps of the construction.
The end result is a grouping of new homes, all built with similar equipment and components manufactured at or near the same time.
The end result is a grouping of loads, with similar characteristics. And, if located near distribution equipment there is potential for interaction.
Centerpoint Energy electrical design criteria requires multiple capacitor bank installations on every distribution circuit. Which results in many capacitor bank located in and around residential developments.
The interaction of the AFCI with events on the distribution system depends on the design of the AFCI. Its response times and sensitivity.
The load served through the AFCI is just as important as the characteristics and design of the AFCI in determining response.
Communication of events, trends and results is essential to insure that all field, dispatch and engineering support are aware of a situation.
One failed component does not make a crisis, but is the first step in identifying a root cause which could eventually impact thousands of customers.