Conduit heating up

[ptonsparky]

I have followed up on ECs who were low bid and have found conduits that added to the A/C load. They were filled to the max and loaded to the max but code min compliant. Using HID rated breakers seems to help with those max loaded CBs that eventually start tripping due to heat.

 

[memyselfandI]

What are the most common things that you guys have seen that make conduits (EMT) heat up????
Just curious

heavy loads, ambient air temperatures, sunlight...

 

[peter d]

The best I ever saw was a 2.5" EMT completely packed with #10's.

It ran about 50' from the electric room panel down to a trough (missing the cover) on the sales floor where the branch circuits split off.

I'm sure they derated all those conductors.

 

[boboelectric]

H.I.D. lighting circuits. I had a few calls in office buildings where office people thought transformers felt too hot. 150 c rating.

 

[danickstr]

a thhn run could go to 190 degrees F and still be code compliant.

The connectors would have to stay below 167 F though.

But that sure seems hot to me.

 

[LarryFine]

a thhn run could go to 190 degrees F and still be code compliant.

194, actually.

F - 32 / 9 * 5 = C

C / 5 * 9 + 32 = F