40? C Terminal Rating : Federal Pacific

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physis

physis

Senior Member
I'm looking at this Federal Pacific breaker and I see that the terminal is rated for 40? C.

I'm assuming that there have been a lot of standards changes since this thing was originally installed. Like, not using 12 AWG on 30 amp circuits for instance, I see a lot of that in these 40's or so buildings here. And the abscence of a 40? C. column in the NEC.

I'm kind of curious how you would determine what conductor gauge to use if you were to install one of these things today.

Not that I'd want to, but I can't think of a code requirement that would prevent me from doing it.

P.S.

The new look is nice, but, where's the spell check?

And I've noticed I'm a "senior member"!

Are senior members supposed to have difficulty using smileys and spell checks? :(

:)
 
No Trevor, no I'm not sure it's the terminal rating, it's molded into it right near the terminal. But ambient temperature would make more sense though.
 
I have a new (well not used) out of the box, 15 amp Federal CB in front of me. Side of CB says CU-AL under that says 40 degrees(symbol) C.

Sticker on edge:

UND LAB INC LIST.
CIRCUIT BREAKER 120/240 V.A.C.
1 POLE UNIT ISSUE NO. LJ-9415
STAB-LOC CTL TYPE NC
40 DEGREE(SYMBOL) C CU-AL AWG #14-#8 MAX
CURRENT INTERRUPTING RATING
10,000 A.I.C. @ 120/240 V.A.C.
FEDERAL PACIFIC ELECTRIC CO.


Second CB says the exact same thing except it's labeled as an HACR type with a different UL number, but this CB included an additional sticker on the side that says:

USE 60 DEGREE (SYMBOL) /75 DEGREE (SYMBOL) C WIRE ONLY
FOR #14-#4 AWG WIRE
LUG TORQUE VALUE
TO BE 25 LB-IN
 
Sam

As far as I know, there has never been a 40'C conductor ampacity. It has always been the ambient temp.

If I remember correctly, the conductor guidelines in 110.14(C)(1) have always been the same.

Older equipment lacked the conductor terminal temp. we have on equip. today.

I'm not even trying to figure this version of the forum yet.

BTW, How ya been Sam?
 
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