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Old 07-23-2011, 10:56 AM   #1
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Meter to main breaker cable selection and connections


I just trenched in 4/0 4/0 2/0 AL URD to my meter socket for a new 200A service to a garage. Am I correct that I can't use the same cable from the meter to the main breaker panel?

The two sit back to back with a 4" threaded nipple between the two. So I would need 3 conductors each maybe 4'. Would 3/0 copper THHN be my best choice here or what are my options? I already have my non oxidation paste for my AL URD connections. I was told to fan out the AL wires to coat each strand in the cable in cable with goop then spiraling them back together before making the connection.

Also I have read conflicting information on the need to re-torking conections or what torque to tighten them to in the first place.

Also just wanted to verify that the top connections on the meter are the LINE side and the bottom connections are the LOAD side.

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Old 07-24-2011, 06:02 PM   #2
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Meter to main breaker cable selection and connections


Quote:
Originally Posted by crankcase View Post
I just trenched in 4/0 4/0 2/0 AL URD to my meter socket for a new 200A service to a garage. Am I correct that I can't use the same cable from the meter to the main breaker panel?

The two sit back to back with a 4" threaded nipple between the two. So I would need 3 conductors each maybe 4'. Would 3/0 copper THHN be my best choice here or what are my options? I already have my non oxidation paste for my AL URD connections. I was told to fan out the AL wires to coat each strand in the cable in cable with goop then spiraling them back together before making the connection.

Also I have read conflicting information on the need to re-torking conections or what torque to tighten them to in the first place.

Also just wanted to verify that the top connections on the meter are the LINE side and the bottom connections are the LOAD side.
What type is the insulation?

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Old 07-24-2011, 06:05 PM   #3
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Meter to main breaker cable selection and connections


URD = multi conductor USE cable assembly
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Old 07-24-2011, 06:13 PM   #4
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Meter to main breaker cable selection and connections


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URD = multi conductor USE cable assembly
Yes, but according to one manufacurers website it could be RHH/RHW, or XHHW-2/USE-2, or THHN/THWN-2, or Type Z/ZW.
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Old 07-24-2011, 09:53 PM   #5
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Meter to main breaker cable selection and connections


If that URD cable is multi rated then it should not be a issue however.,, if only marked URD nothing else then it can NOT run inside the building at all.

Merci,
Marc
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Old 07-24-2011, 10:43 PM   #6
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Meter to main breaker cable selection and connections


URD is an acronym for underground residential distribution, and is not listed in the Code.

Here is another manufacturer's website that is more accurate in its description of this item.
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Old 07-25-2011, 12:08 AM   #7
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Meter to main breaker cable selection and connections


Quote:
Originally Posted by crankcase View Post
I just trenched in 4/0 4/0 2/0 AL URD to my meter socket for a new 200A service to a garage. Am I correct that I can't use the same cable from the meter to the main breaker panel?

The two sit back to back with a 4" threaded nipple between the two. So I would need 3 conductors each maybe 4'. Would 3/0 copper THHN be my best choice here or what are my options? I already have my non oxidation paste for my AL URD connections. I was told to fan out the AL wires to coat each strand in the cable in cable with goop then spiraling them back together before making the connection.

Also I have read conflicting information on the need to re-torking conections or what torque to tighten them to in the first place.

Also just wanted to verify that the top connections on the meter are the LINE side and the bottom connections are the LOAD side.

If the cable does not have any other insulation rating it can't be used inside. The THHN will be your better choice. Check the cable and see if it has any other insulation rating.
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Old 07-25-2011, 08:02 AM   #8
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Meter to main breaker cable selection and connections


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Originally Posted by electures View Post
If the cable does not have any other insulation rating it can't be used inside. The THHN will be your better choice. Check the cable and see if it has any other insulation rating.
I will double check the cable at home and post my findings, but the Home store site says triple rated.

Product Description:

4/0-4/0-2/0 Aluminum URD
  • Used to Connect the Transformer to the Meter Base
  • Suitable for Direct Burial
  • Cross-Linked Polyethylene Insulation
  • Triple Rated RHH or RHW-2 or USE-2
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Old 07-25-2011, 11:00 AM   #9
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Meter to main breaker cable selection and connections


Quote:
Originally Posted by crankcase View Post
I will double check the cable at home and post my findings, but the Home store site says triple rated.

Product Description:

4/0-4/0-2/0 Aluminum URD
  • Used to Connect the Transformer to the Meter Base
  • Suitable for Direct Burial
  • Cross-Linked Polyethylene Insulation
  • Triple Rated RHH or RHW-2 or USE-2
Good to go. This cable is rated for use inside. Make sure you use De-Ox and torque all terminations. Good luck!
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Old 07-25-2011, 11:05 AM   #10
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Meter to main breaker cable selection and connections


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Originally Posted by electures View Post
Good to go. This cable is rated for use inside. Make sure you use De-Ox and torque all terminations. Good luck!
Is the torque spec listed anywhere on the panel? There is a small sticker next to the lugs but I need to find a magnifing glass to try and read it.
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Old 07-25-2011, 12:23 PM   #11
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Meter to main breaker cable selection and connections


Quote:
Originally Posted by crankcase View Post
Is the torque spec listed anywhere on the panel? There is a small sticker next to the lugs but I need to find a magnifing glass to try and read it.
It will be on the panel label.

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