Thus the equipment PHI score is an average of the
number of installed units.
MODEL B (9-point PHI)
In order to overcome the challenge working with a
summated score system, a converted score model
was developed.
The routine test results are converted to a score
between 1 and 3 where 1 = a good score, 2 = an alarm
score and 3 = an urgent score. The blue phase of the
F1 circuit breaker has a contact resistance value of
842. Table 7 lists the contact resistance test limits for
the particular MV circuit breaker [9]: