90 degree rating

[Karl H]

Do any of you think that one day we will see 90 degree rated

lugs,devices,etc. in the future?

We went from 60 to 75. Is 75 to 90 impossible?

 

[Buck Parrish]

Yes, Since their is a 90 degree colum . There may now be some with that rating.

 

[Karl H]

Yes, Since their is a 90 degree colum . There may now be some with that rating.

I should of been more clear. 90 degree rating for all
common lugs and devices.As 75 degree lugs,devices are a common
rating today.

 

[jim dungar]

Yes, Since their is a 90 degree colum . There may now be some with that rating.

There ae no UL Listed protective devices (600V) rated for use with conductors sized using the 90?C column.

Other than derating, the most common application for the 90?C ratings would be the run between to junction boxes.

 

[infinity]

Do any of you think that one day we will see 90 degree rated

lugs,devices,etc. in the future?

We went from 60 to 75. Is 75 to 90 impossible?

I hope not. The NEC is confusing enough with 60 and 75 let's not throw 90 into the mix.

 

[Pierre C Belarge]

With the percentage of failures in our industry being so high at terminations, I do not believe we will see this anytime soon.

The technology is available today, but I think the manufacturers do not want to expose themselves to too much more liability just yet.

As soon as the first manufacturer does get a UL listed 90C product, the rest will follow suit.

 

[jim dungar]

Actually, protective devices use the conductors as heat sinks. If 90?C terminations were allowed almost all of our protective devices would probably get physically larger.

90?C insulation (i.e. THHN) has been around for more than 30 years. If there was an advantage to 90?C terminations, some manufacturer would have already implemented it.

 

[Karl H]

Great posts everyone! My thinking is,it seems like everything today electrical
is getting more and more "Idiot Proof".IMO the only limitations of
"Idiot Proof" is the termination to the power source. 75degrees is common
now but, will we see 90 degrees in the future?

 

[don_resqcapt19]

Why would we want to install a system that wastes more energy? If you are running the conductors at 90?C you are using energy in a nonproductive way to heat the conductor.

 

[Karl H]

Why would we want to install a system that wastes more energy? If you are running the conductors at 90?C you are using energy in a nonproductive way to heat the conductor.

That is a good point. Power loss would increase. So limiting

90 degree insulation to 75 degree terminations and not even offering

90 degree lugs and devices as an option is another example of

"Idiot Proofing." Clever.