20 amp circuits

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dnem

Senior Member
Location
Ohio
iwire said:
dnem said:
Maybe I shouldn't be making so many assumptions on a public message board where people will surf thru and say, "Hey, I can put 30ccc in a pipe that are 14gauge on 15amp breakers whenever I want to !"
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I think that is a wise thought.
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petersonra said:
it seems safe to assum 90 deg c insulation since I don't think anyone makes 60 deg C insulated wire anymore.
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Don't make my mistake !
The smart people here ask questions first and then answer.
After the OP answers and gets specific, then you can go thru the process.

You figure it 3 ways and take the lowest of the 3.
1] wire, usually 90?C but ask the OP and let him tell you that. . Then adjust for cccs and ambient
2] lug, almost always 75?C but ask the OP and let him tell you that.
3] raceway, usually only a 60?C issue on NM or SE [334.80 + 338.10(B)(4)(a)] but ask the OP and let him tell you that.

Then you decide if you have cord + plug round down circuits or you can "one up" [240.4(B)(1)+240.6(A)] but ask the OP and let him tell you that.
 
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dnem

Senior Member
Location
Ohio
JohnJ0906 said:
UF is a 60 deg C conductor.
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I'm not sure if I agree with you or not because I don't know what it means when it says: "Installed as nonmetallic-sheathed cable. Where so installed ....." [340.10(4)]. . What the 7734 does that mean ?

Let me take a guess.
If I direct bury it, then I'm not installing it "as nonmetallic-sheathed cable" because NM is not allowed to be direct buried. . But if I put it in a conduit inside then I'm limited to the Part 2 of 334 which includes 334.80 and 60?C ampacity limitation. . But if it's in a conduit outside then .....

no forget it !

I don't get it. . I don't know what ""Installed as nonmetallic-sheathed cable" means.
 
electricalperson

electricalperson

Senior Member
Location
massachusetts
dnem said:
I'm not sure if I agree with you or not because I don't know what it means when it says: "Installed as nonmetallic-sheathed cable. Where so installed ....." [340.10(4)]. . What the 7734 does that mean ?

Let me take a guess.
If I direct bury it, then I'm not installing it "as nonmetallic-sheathed cable" because NM is not allowed to be direct buried. . But if I put it in a conduit inside then I'm limited to the Part 2 of 334 which includes 334.80 and 60?C ampacity limitation. . But if it's in a conduit outside then .....

no forget it !

I don't get it. . I don't know what ""Installed as nonmetallic-sheathed cable" means.
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when they mean installed as nonmetallic sheathed cable they mean if you use it to wire your house or something like that. another way of saying is your not using it as an underground wiring method but as a method describe in 334
 
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