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#90966 12/19/04 08:36 AM
Joined: Aug 2004
Posts: 20
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AndyP Offline OP
Member
What is the ampacity of the wire in #11 if it was installed to feed Light poles?

I look in Article 310.16 but I'm just confused.

lol man I'm tired. #11 meaning THHN 8 awg

[This message has been edited by AndyP (edited 12-19-2004).]

[This message has been edited by AndyP (edited 12-19-2004).]

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#90967 12/19/04 08:43 AM
Joined: Feb 2003
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"What is the ampacity of the wire in #11 if it was installed to feed Light poles?"

Whats #11 refer to?

#90968 12/19/04 08:56 AM
Joined: Aug 2004
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AndyP Offline OP
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Never mind I think it's 55a

#90969 12/19/04 09:09 AM
Joined: Feb 2003
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Generally conductors below 100amp are rated according to the 60degree column of 310.16.

You must rate the wire to the lowest value of any component in the circuit. The degree rating of the breaker, and any devices, lugs, or equipment, have to be taken into concideration.

8 copper = 40amps for 3 or less conductors.
You have to derate if you have more than three conductors or have ambient temperatures greater than 86 degrees F.

To derate the wire use the 90 degree column if using thhn/thwn.

[This message has been edited by russ m (edited 12-19-2004).]

#90970 12/19/04 09:15 AM
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while you may use the 90 degree column for derating, (use what ever column the wire is rated for) you still have to use the lower of the two values for your conductor ampacity. Meaning the the lower of the two, (1)60 degree column or (2)the derated 90 degree wire.

[This message has been edited by russ m (edited 12-19-2004).]

#90971 12/19/04 09:19 AM
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AndyP Offline OP
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Thanks

#90972 12/19/04 09:19 AM
Joined: Jan 2003
Posts: 4,391
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Moderator
Andy it is very unlikely you can use the 90 C column which lists 8 AWG @ 55 amps.

You may very well be able to use the 75 C column if the terminations you are using are rated 75 C. At 75 C 8 AWG CU is rated 50 amps.


Bob Badger
Construction & Maintenance Electrician
Massachusetts
#90973 12/19/04 09:28 AM
Joined: Feb 2003
Posts: 169
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Member
It might be helpfull for you to look at article 110.14(C)

I had to edit the article number

[This message has been edited by russ m (edited 12-19-2004).]

[This message has been edited by russ m (edited 12-19-2004).]


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