Table 21: Ambiguity from for four-step RC ladder network.

FaultAmbiguity with the following

short open (all ), short (), short (all ), open (), short (  & ≥12), short (), open (), short (), open ()
open short (all ), short (), short (all ), open (), short (  & ≥12), short (), open (), short (), open ()
short short, open (), short (), open, short (), short, open (), short (), open ()
short short, open (all ), short, short (), open (), short, short (), open (), open ()
open short, open (), short (), short (), short (), short, open, short (), open ()
short short, open (  & ≥12), short (), short (), open (), short (), open (,   & ≥18), short (), open (, )
short short, open, short (), short (), open (), short (), open (), short (), open (, )
open short, open (), short (), short, open (), short (,   & ≥18), short, short ()
short short, open, short, open (), short (), open (), short (), short (), short (), open ()
short short ()
open short, open, short, short, open (), short, short (, ), short ()
shortNo ambiguity