TERMINATION TEMP

[stev11]

HI

when I select the cable size there is termination temp term ,so. is this mean that there is different termination temp depends on the specs of components like contractor, overload and C.B??/

 

[chris kennedy]

Most common 60C, 75C and 90C. For example most OCPD's and mechanical lugs are rated 75C while most tap connectors like Polaris are rated 90C.

 

[stev11]

Most common 60C, 75C and 90C. For example most OCPD's and mechanical lugs are rated 75C while most tap connectors like Polaris are rated 90C.

OK, but who will tell me the correct value?? is it component manufacturer??? because I have some cables are hot at the entrance of contractor only.
and I select THHN cable that have 90c.

 

[augie47]

110.14 will give you the "general" rule. The components are also often marked (such as circuit breakers).
Terminating at the 90? rating is very rare,

 

[bob]

I am not aware of any equipment rated 600 volts and below that has a 90C rating. So you are stuck with a max rating of 75C. Some older equipment may have a 60C rating.

 

[jim dungar]

I am not aware of any equipment rated 600 volts and below that has a 90C rating. So you are stuck with a max rating of 75C. Some older equipment may have a 60C rating.

Basically:
Power distribution blocks, and othe conductor splicing equipment (e.g. wirenuts) are rated at 90?C.
Utilitation equipment and protective devices are usually rated 75?C.

I can't think of much built since the late 70's, other than lighting equipment and NM cable, that was only 60?C. Since the 90's NM-B and lighting equipment is 90?C.

 

[Smart $]

Just want to add that when using a 90?C-rated terminals (such as compression connectors, power distribution blocks, etc.) does not mean you can use 90?C as the termination temperature. Generally speaking, the coordinated termination temperature is the minimum of all such ratings within the enclosure where the conductor is terminated .