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Old 06-28-2016, 10:27 PM   #1
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Default CEC code discuss: for direct buried PVC like this, we have to use table D11A?

we can't use table 2 or table 4 for calculate the conductor's ampere for this situation, right?
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Old 06-28-2016, 10:41 PM   #2
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Why do you keep posting CEC questions to the general electrical section?
You know there's a CEC section right?
P&L
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Old 06-28-2016, 11:30 PM   #3
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Why do you keep posting CEC questions to the general electrical section?
You know there's a CEC section right?
P&L
hey, what do you think about my question?
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Old 06-29-2016, 12:44 AM   #4
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hey, what do you think about my question?
I must be missing something. What exactly is the question?

Borgi
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Old 06-29-2016, 08:15 AM   #5
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hey, what do you think about my question?
Post it in the Canadian section. You should learn how to use the site.

Canada is a big place. Maybe narrow it down a bit.
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Old 06-29-2016, 06:55 PM   #6
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nobody knows?
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Old 06-29-2016, 06:57 PM   #7
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nobody knows?
All I know is, a three hundred pound dog, is a big dog.

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Old 06-29-2016, 06:58 PM   #8
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in which situation do we need to use D11A?
nobody knows?
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Old 06-29-2016, 07:23 PM   #9
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in which situation do we need to use D11A?
nobody knows?
Ok, I'll be more serious.

You have a code book that explains, answers your question. Seems clear to me.

If you are in need of help understanding the table, and Rule 4-004, ask a more specific question, and someone will most certainly help.

Borgi
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Old 06-29-2016, 11:41 PM   #10
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Ok, I'll be more serious.

You have a code book that explains, answers your question. Seems clear to me.

If you are in need of help understanding the table, and Rule 4-004, ask a more specific question, and someone will most certainly help.

Borgi
here are the my specific question, when should we use this table?
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Old 06-29-2016, 11:47 PM   #11
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When your installation requires it.

The code book is your friend!

Borgi

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Old 07-05-2016, 09:53 PM   #12
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up.........................
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Old 07-06-2016, 01:56 AM   #13
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The intent of the D11 rules is permit higher ampacities by incorporating the large heat conducting capacity of the earth to keep the insulation from being damaged. However those higher ampacities were calculated with certain minimum spacing assumptions and the D11 rules enforce the use of those assumptions. IE: you need a minimum amount of earth around your conduit/cable for the earth to be able to absorb the heat and carry it away.

So you can't use D11 unless your conduit spacing matches or exceeds the spacing shown on the associated diagram for the specific sub table. That big pile of conduits isn't going to match anything in that section.

Which means you have to fall back on 4-004(1) or (2) modified by by other 4-004 sub-rules (and 8-104 if it applies) as needed.
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Old 07-06-2016, 03:54 AM   #14
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The intent of the D11 rules is permit higher ampacities by incorporating the large heat conducting capacity of the earth to keep the insulation from being damaged. However those higher ampacities were calculated with certain minimum spacing assumptions and the D11 rules enforce the use of those assumptions. IE: you need a minimum amount of earth around your conduit/cable for the earth to be able to absorb the heat and carry it away.

So you can't use D11 unless your conduit spacing matches or exceeds the spacing shown on the associated diagram for the specific sub table. That big pile of conduits isn't going to match anything in that section.

Which means you have to fall back on 4-004(1) or (2) modified by by other 4-004 sub-rules (and 8-104 if it applies) as needed.
Good answer, makes sense.
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Old 07-06-2016, 05:17 PM   #15
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Quote:
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The intent of the D11 rules is permit higher ampacities by incorporating the large heat conducting capacity of the earth to keep the insulation from being damaged. However those higher ampacities were calculated with certain minimum spacing assumptions and the D11 rules enforce the use of those assumptions. IE: you need a minimum amount of earth around your conduit/cable for the earth to be able to absorb the heat and carry it away.

So you can't use D11 unless your conduit spacing matches or exceeds the spacing shown on the associated diagram for the specific sub table. That big pile of conduits isn't going to match anything in that section.

Which means you have to fall back on 4-004(1) or (2) modified by by other 4-004 sub-rules (and 8-104 if it applies) as needed.
thanks,

everybody please add your comments
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Old 07-08-2016, 11:02 PM   #16
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