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REQ:Breaker Maximum...6AL...? Joey_Bitchn' 08-02-2005
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Posted by Joey_Bitchn' on August 2, 2005, 2:18 pm


Greetings could someone post an anwser to the group for the following:

I have a home that is about 20 years old. The sub-panel in the
basement is a 100 AMP panel. I have an aluminum wire that runs from
the panel to a new airconditiong unit I had installed recently. The
wire reads:
SE Cable Style U Type XHHW CDRS 600V 3 CDRS 6 AL (UL) 1983

I currently have a 40 AMP breaker installed that keeps tripping after
the AC unit cycles on and off a few times. The AC guy that installed
it said to put in a 50 AMP breaker but I can't find the information to
see if this wire can take that size breaker. If someone can help me
find the info or if you know for sure that a 50 AMP breaker is OK,
could you please let me know?

PS The AC unit says it can take a max breaker of 60 AMP.

Thanks

Joe


Posted by John Grabowski on August 2, 2005, 5:34 pm


Check out table 310.16. in the National Electrical Code. If all of the
terminals are rated for 75 degrees Celsius, than you can install a 50 amp
circuit breaker. The electrician probably should have run a 60 amp line
since that is what the nameplate says is the maximum. You might want to put
an ammeter on the line to see how much current the unit is actually drawing.



> Greetings could someone post an anwser to the group for the following:
>
> I have a home that is about 20 years old. The sub-panel in the
> basement is a 100 AMP panel. I have an aluminum wire that runs from
> the panel to a new airconditiong unit I had installed recently. The
> wire reads:
> SE Cable Style U Type XHHW CDRS 600V 3 CDRS 6 AL (UL) 1983
>
> I currently have a 40 AMP breaker installed that keeps tripping after
> the AC unit cycles on and off a few times. The AC guy that installed
> it said to put in a 50 AMP breaker but I can't find the information to
> see if this wire can take that size breaker. If someone can help me
> find the info or if you know for sure that a 50 AMP breaker is OK,
> could you please let me know?
>
> PS The AC unit says it can take a max breaker of 60 AMP.
>
> Thanks
>
> Joe



Posted by TURTLE on August 2, 2005, 7:51 pm



> Greetings could someone post an anwser to the group for the following:
>
> I have a home that is about 20 years old. The sub-panel in the
> basement is a 100 AMP panel. I have an aluminum wire that runs from
> the panel to a new airconditiong unit I had installed recently. The
> wire reads:
> SE Cable Style U Type XHHW CDRS 600V 3 CDRS 6 AL (UL) 1983
>
> I currently have a 40 AMP breaker installed that keeps tripping after
> the AC unit cycles on and off a few times. The AC guy that installed
> it said to put in a 50 AMP breaker but I can't find the information to
> see if this wire can take that size breaker. If someone can help me
> find the info or if you know for sure that a 50 AMP breaker is OK,
> could you please let me know?
>
> PS The AC unit says it can take a max breaker of 60 AMP.
>
> Thanks
>
> Joe

This is Turtle.

Joey , i know just about all # 6 AL. good wire like you yhave here will run good
on 50 amp breakers on them. Now one thing you did not say and that was how long
of a run was the #6 Wire as to distance fromn the breaker to the hvac units.
Untill you give this info. i can not say the wire would be OK or not. So for now
No it will not work till you give the wire distance to concider.

TURTLE




Posted by Joey_Bitchn' on August 2, 2005, 7:14 pm


Turtle,
The length of the wire is about 30 feet on the conservative side. I
didn't get a chance to check the draw on the circuit though. I'll try
getting that tomorrow assuming I can figure out how to do it
correctly.
Thanks for the help
Joe
>
>This is Turtle.
>
>Joey , i know just about all # 6 AL. good wire like you yhave here will run
good
>on 50 amp breakers on them. Now one thing you did not say and that was how long
>of a run was the #6 Wire as to distance fromn the breaker to the hvac units.
>Untill you give this info. i can not say the wire would be OK or not. So for
now
>No it will not work till you give the wire distance to concider.
>
>TURTLE
>



Posted by TURTLE on August 3, 2005, 12:44 am



> Turtle,
> The length of the wire is about 30 feet on the conservative side. I
> didn't get a chance to check the draw on the circuit though. I'll try
> getting that tomorrow assuming I can figure out how to do it
> correctly.
> Thanks for the help
> Joe

This is Turtle.

The Ugly Book says you have up to about 50 feet or a little more for the 50 amp
ability and 50 amp breaker. Your well under with 30 feet.

TURTLE




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