Hi there,
If you are interested in classifying potential failures by temperature, you could check out NETA and/or NFPA70B.
I would use these as a guide rather than a "set-in-stone" rule however and do not forget than when looking at delta-T measurements for comparison, wherever possible take load readings, but please do it safely.
Good luck,
Tony Holliday
Hawk IR International Ltd.
Web. http://www.hawk-ir.com/
Toll Free. 1-877-4-HAWKIR |