Question: 

What limit is used in PQ Health Summary for the events?

Answer: 

PQ Health Summary in Fluke Energy analyze Plus software shows the result of a logging session and evaluation according to EN 50160 or its national derivatives.
The dotted line on top of the Summary indicates the limits of the parameters that are noted on the horizontal axis. 
See also the illustration.

The parameter "Events" is a special one as this is not specified by EN 50160, yet it is worth to have it in the summary; even if the results comply to the standard's limits, the events (like dips and swells) may give reason for customer complaints.
For Events the limit is set to 100 and this has nothing to do with any standard but was chosen arbitrary by our development engineers in order to keep the overview consistent.