4/0 splice

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Gaffen99

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new jersey
Can anyone give me an article that would address whether you can extend 4/0 wires with crimps in a c fitting(2"), or do I need a box. This is just a straight run and I have looked at 314, but maybe I'm missing something.
 
Gaffen99 said:
Can anyone give me an article that would address whether you can extend 4/0 wires with crimps in a c fitting(2"), or do I need a box. This is just a straight run and I have looked at 314, but maybe I'm missing something.
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314.16(C)
(C) Conduit Bodies

(2) With Splices, Taps, or Devices Only those conduit bodies that are durably and legibly marked by the manufacturer with their volume shall be permitted to contain splices, taps, or devices. The maximum number of conductors shall be calculated in accordance with 314.16(B). Conduit bodies shall be supported in a rigid and secure manner.
Rick
 
RUWired said:
314.16(C)
(C) Conduit Bodies

(2) With Splices, Taps, or Devices Only those conduit bodies that are durably and legibly marked by the manufacturer with their volume shall be permitted to contain splices, taps, or devices. The maximum number of conductors shall be calculated in accordance with 314.16(B). Conduit bodies shall be supported in a rigid and secure manner.
Rick
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I should have also added 314.28
314.28 Pull and Junction Boxes and Conduit Bodies
Boxes and conduit bodies used as pull or junction boxes shall comply with 314.28(A) through (D).
Rick
 
Your going to need a heck of a big C fitting to code compliantly spice 4/0s.

It would without a doubt have to be larger than the pipe size it is connected to.
 
Gaffen99 said:
Can anyone give me an article that would address whether you can extend 4/0 wires with crimps in a c fitting(2"), or do I need a box. This is just a straight run and I have looked at 314, but maybe I'm missing something.
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Use a box you'll never do it with a 2"C fitting.
 
don_resqcapt19 said:
Rick,
That is fine but how do you make the volume calculation for 4/0? The table stops at #6.
Don
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Good question, i thought about that myself. This is the thing I'm only extending the feeders about 2 feet, so if I crimp them first and slide the fitting with the pipe over it is this possible. Just a question, I'm still going to box it.
 
don_resqcapt19 said:
Tom,

Yes, but I don't see any rules about the volume required for conductors #4 and larger, yet 314.16 requires a volume calculation.
Don
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Don, 314.16 refers you to 314.28
314.16 Number of Conductors in Outlet, Device, and Junction Boxes, and Conduit Bodies

Boxes and conduit bodies enclosing conductors 4 AWG or larger shall also comply with the provisions of 314.28.
Rick
 
RUWired said:
Don, 314.16 refers you to 314.28
314.16 Number of Conductors in Outlet, Device, and Junction Boxes, and Conduit Bodies

Boxes and conduit bodies enclosing conductors 4 AWG or larger shall also comply with the provisions of 314.28.
Rick
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I believe don was talking about volume fill look at article 314.16(C). It doesn't give the volume fill for larger than #6. I think this is what he was saying. 314.16 First paragraph says the min. vol of conduit bodies shall be calculated in 314.16(c).
 
Dennis Alwon said:
I believe don was talking about volume fill look at article 314.16(C). It doesn't give the volume fill for larger than #6. I think this is what he was saying. 314.16 First paragraph says the min. vol of conduit bodies shall be calculated in 314.16(c).
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Dennis,It goes on to say,
Boxes and conduit bodies enclosing conductors 4 AWG or larger shall also comply with the provisions of 314.28.
This is why the table stops at # 6 awg.
Rick
 
Rick,
Boxes and conduit bodies enclosing conductors 4 AWG or larger shall also comply with the provisions of 314.28.
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Yes, the conduit body must comply with both the volume rule in 314.16 and the size rule in 314.28. How do you comply with the volume part of the rule for conductors #4 and larger without a volume allowance in Table 314.16(B)?
Don
 
don_resqcapt19 said:
Rick,

Yes, the conduit body must comply with both the volume rule in 314.16 and the size rule in 314.28. How do you comply with the volume part of the rule for conductors #4 and larger without a volume allowance in Table 314.16(B)?
Don
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You don't, You write the code makers and tell them to drop the word "also" in the last paragraph of 314.16.(was there a worm on that hook!)
Rick
 
Rick,
You don't, You write the code makers and tell them to drop the word "also" in the last paragraph of 314.16.
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So what the code is really saying is that the use of condutors #4 and larger in box or conduit body is always a violation.:grin:
 
I can say I have had to do it against better knowledge and judgement (hindsight says I didn't "have" to do anything) and it is not the way to go. I think my splice was a 2/0 and it may have even been in a j-box, now that I think as I type, but what ever it was I was too conservative. Those requirements are there for a reason, which you don't want to figure out in the middle of the job.:roll:
 
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