Typical Life Expectancy of Electrical Switchgear

[elpowered]

I have seen some various references to typical life expectancies of electrical switchgear, including IEEE 493 and NFPA 70B. However, an earlier thread mentioned two papers which no longer link, including:

http://www.ise.nus.edu.sg/proceedings/apors2000/fullpapers/17-01-fp.htm

http://www.siemenstd.com/prods/mv/techtopics/TechTopics15Rev0.pdf

Does anyone have these papers or know where they link to now? And would anyone have better, more recent papers discussing this topic?