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Old 03-04-2013, 11:49 AM   #1
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Conductor sizing


The rural cooperative POCO installed a new transformer, a new meter, and new 4 awg copper wire in the meter loop (on a pole) to be used as a feeder to the property (after the main service disconnect). The cooperative also advised that the transformer is sufficient for 125 amp service.

I installed a 125 amp main breaker panel immediately below the meter and used 1 AWG from the bottom of the meter to the main service breaker.

According to my review of NEC 310.15(B)(16), I can't find any column where 4 AWG copper is sufficient for 125 amps. So which of the following is the correct scenario:

1. The property will not have 125 amps available due to insufficient cable installed by the cooperative?

2. I am mis-interpreting the correct conductor size for a 125 amp service?

At the moment, I don't know the size of the wires coming from the transformer to the top of the meter. I'll have to check that.

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Old 03-04-2013, 12:29 PM   #2
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Conductor sizing


POCO has their own rules for wire sizing.

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Old 03-04-2013, 12:40 PM   #3
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Conductor sizing


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POCO has their own rules for wire sizing.
That may be. So now the question is which 'rules' are correct? Is the 4 AWG going to melt away if the respective amperage listed in the NEC table is exceeded?

I guess this brings up the question of 'ownership' or 'responsibility'. The 4 AWG was installed in the meter loop assembly (service head, pipe, meter socket), I suppose, as a favor to the customer?? The 4 AWG is utilized AFTER the service disconnect. To whom does it belong??
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Old 03-04-2013, 01:03 PM   #4
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Conductor sizing


AS stated, the POCO follows a different set of rules. Their service drop is also considered "free air" which allows higher ampacities.
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Old 03-04-2013, 04:23 PM   #5
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Conductor sizing


From the weatherhead down is normally the customers responsibility.
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Old 03-04-2013, 04:32 PM   #6
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Conductor sizing


Quote:
Originally Posted by Jim Port
From the weatherhead down is normally the customers responsibility.
Even before the meter?
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Old 03-04-2013, 04:43 PM   #7
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Conductor sizing


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Even before the meter?
Yep, in every place I have lived the POCO only takes it to the weather head.
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Old 03-04-2013, 04:59 PM   #8
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Conductor sizing


So now there are conflicting answers. If the meter loop is customer's responsibility then why do POCO rules apply to sizing the conductors?

Perhaps I'll inquire with POCO.
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Old 03-04-2013, 05:11 PM   #9
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Conductor sizing


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So now there are conflicting answers. If the meter loop is customer's responsibility then why do POCO rules apply to sizing the conductors?

Perhaps I'll inquire with POCO.
They don't, those conductors are sized by the NEC and are not free air whether in conduit or SE cable. And are installed by the customer. I know as I had to replace mine when a tree pulled my service down and bent my mast. Bent the mast and squashed the conductors.

In my service area if the service is under ground, the POCO supplies and install the feeder to the meter. Customer digs and provides the conduit.
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Last edited by rjniles; 03-04-2013 at 05:13 PM.
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Old 03-04-2013, 05:11 PM   #10
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Conductor sizing


Most likely there is a junction right at the weatherhead, and thicker wire goes down to the meter.
Either way, it is really nothing worth worrying about.
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Old 03-04-2013, 05:34 PM   #11
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Conductor sizing


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Originally Posted by Kyle_in_rure
Most likely there is a junction right at the weatherhead, and thicker wire goes down to the meter.
Yes. But that's not the issue. It's the conductors leaving the service disconnect and going to the house.

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Either way, it is really nothing worth worrying about.
Except for compliance with the NEC. And perhaps melting the insulation. Which might result in a short circuit. Which would create a loss of power and create more work. You're right...nothing to worry about.

Last edited by jlmran; 03-04-2013 at 05:43 PM.
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Old 03-04-2013, 05:44 PM   #12
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Conductor sizing


Quote:
Originally Posted by jlmran View Post
Yes. But that's not the issue. It's the conductors leaving the service disconnect and going to the house.



Except for compliance with the NEC. And perhaps melting the insulation. Which might result in a short circuit. Which would create a loss of power and create more work. You're right...nothing to worry about.
Just leave it alone, you're not grasping the concept.
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Old 03-04-2013, 05:47 PM   #13
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Conductor sizing


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Just leave it alone, you're not grasping the concept.
Has the concept been communicated effectively? Seriously, what am I missing?
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Old 03-04-2013, 05:52 PM   #14
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Conductor sizing


Quote:
Originally Posted by jlmran View Post
Has the concept been communicated effectively? Seriously, what am I missing?
Yes it has....

Quote:
Originally Posted by jlmran View Post
The rural cooperative POCO installed a new transformer, a new meter, and new 4 awg copper wire in the meter loop (on a pole) to be used as a feeder to the property (after the main service disconnect). The cooperative also advised that the transformer is sufficient for 125 amp service.
The Poco does not abide by the NEC.
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Old 03-04-2013, 05:57 PM   #15
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Conductor sizing


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Originally Posted by stickboy1375 View Post
Yes it has....



The Poco does not abide by the NEC.
No it hasn't...

Have you read the other posts which state that these conductors are not the POCOs responsibility? Which posts are accurate?

The concept is...did the POCO install the wrong conductors, and is it the customer's responsibility to make it right?

Are these 4 awg conductors subject to the NEC or to the POCO rules? Does the fact that POCO installed them automatically exempt them from NEC requirements?


Last edited by jlmran; 03-04-2013 at 06:02 PM.
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