17EATON CORPORATION BR003010ENQuestions about installationDo AFDDs only have to be used in final circuits?AFDDs are recommended to protect against the effects of arc faults in final circuits only. If used, AFDDs shall be placed at the origin of the final circuit to be protected.Is there a limitation to amperage?The IEC 60364 series does not limit the application of AFDDs to amperage in final circuits.What about protecting three-phase final circuits?IEC 60364 does not distinguish between single- and three-phase final circuits. The AFDD product standard IEC 62606 covers single-phase devices, three-phase devices are under consideration.As the majority of installations are provided with single-phase final circuits, it is clear that today’s focus is on single-phase final circuits and their protection.Why is it not wise to combine AFDDs with miniature circuit breakers (MCBs) only?The combination of AFDDs with MCBs only is protecting against short-circuit currents, overload currents and arc faults, which can be an ignition source for fires. However, this combination cannot protect against all electrical hazards. A higher level of protection can be achieved if the AFDD is equally combined with short-circuit current, overload current and residual current protection.This combination offers the most reliable and most comprehensive protection in final circuits. Combining the AFDD with an RCBO (combination of RCCB and MCB) is today’s most convenient way of offering complete protection and lowering the risk of electrically ignited fires.?
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