formulars

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jhc8796

Member
Yes I am studing for a test I had a ? It asked current carried continually not to exceed 700 amps per square inch cross section in aluminum bus bar. What is the ampacity of a 1-1/2 round aluminum bus bar. Ok where would I find this formular is it in the code book or could someone tell me the formular, if so would the same formular work for copper bus bar?
 
J

jhc8796

Member
Re: formulars

Thanks Gravity but at the moment I only have a 99 code book . Is there someowhere online I could look up that specific code? 366.7
 
ron

ron

Senior Member
Location
New York, 40.7514,-73.9925
Re: formulars

I doesn't seem necesary to look under the aux. gutters as they already gave him the 700A per sq. in. for AL bus.
Am I reading into the question to much or not enough?
 
G

gwz2

Senior Member
Location
Indiana
Re: formulars

Ron has it correct.

1.5" round aluminum bar has a radius of .75"

A = 3.1417 * R * R

A = 3.1417 * .75 * .75

A = 3.1417 * 0.5625

A = 1.7672062 Sq inches

1.7672062 Sq" * 700A = 1237.0443 Amps
 
charlie b

charlie b

Moderator
Staff member
Location
Lockport, IL
Occupation
Semi-Retired Electrical Engineer
Re: formulars

After further review by the Replay Official, the ruling on the field (by gwz2 and Ron) stands as called. The rule is that the area of a circle is ?pi? times the square of the radius, or equivalently, one quarter of ?pi? times the square of the diameter. Frank is charged with a time out.
 
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