1+. IMO, You need several sets of limits: standard limits posted to the consumer, engineering limits posted to the techie/maintenance guy/developer/etc, and ac

1+. IMO, You need several sets of limits: standard limits posted to the consumer, engineering limits posted to the techie/maintenance guy/developer/etc, and actual limits.... each of those is comfortably beyond the others. Know the actual limit, but design well under that if at all possible, because the system will be misused.