Laser thermometer

[mick21]

Hi guys
on a site today and an in house sparks was takeing tempratures using a laser thermometer from cables and terminals within a db,just wondering what he was actually doing and why,any ideas.

 

[telectrix]

checking cables and terminals for overheating. i've got one.

 

[mick21]

At what tempreture indicates a potential problem.

 

[telectrix]

pvc cable is rated up to 70deg. C. but rarely reaches anywhere near that. if, say you had a poor connection in a MCB terminal, this would cause excessive heat due to high resistance. i have rarely found a cable to read over 40deg.

 

[mick21]

Thanks for the info