Nuisance tripping of residual current circuit breakers: A practical case

Abstract

Residual current circuit breakers (RCCBs) are often used to provide protection against indirect contacts in a grounded electrical installation. However, there are situations where the use of RCCBs presents certain problems. In some installations, tripping may occur for no apparent reason. Furthermore, it is very laborious and difficult to find the cause of such nuisance tripping in RCCBs. This article presents a case studied by the authors in the La Fe Hospital in Valencia (Spain), where the nuisance tripping of RCCBs became a serious problem. The methodology followed to find the causes and the solutions adopted are described.