4 wire or 3 wire?
#1
12-13-14, 04:00 PM
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4 wire or 3 wire?
Hello all,
I have 200amp meter main with distribution lugs (post mounted/freestanding), my house has been wired and now I am ready to pull the line in underground from the meter main to the house panel. There are ground rods at the meter main and also a ufer ground at the house panel. Do I only need to install two hot legs and a neutral or do I also need a ground wire ran from the meter main to the house panel? The meter main is approx. 50' from the house panel.
Thanks!
I have 200amp meter main with distribution lugs (post mounted/freestanding), my house has been wired and now I am ready to pull the line in underground from the meter main to the house panel. There are ground rods at the meter main and also a ufer ground at the house panel. Do I only need to install two hot legs and a neutral or do I also need a ground wire ran from the meter main to the house panel? The meter main is approx. 50' from the house panel.
Thanks!
#2
12-13-14, 05:13 PM
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Welcome to the forums!
Is sounds to me that your pole mounted panel is the main for the property. That would make the house panel a sub panel detached from the main "building". You need 4 wires.
Is sounds to me that your pole mounted panel is the main for the property. That would make the house panel a sub panel detached from the main "building". You need 4 wires.
#3
12-13-14, 09:53 PM
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Thanks for the response, I know I can buy some 4/0 4/0 2/0 aluminum URD at the local home improvement store. Would it be acceptable to buy a separate #4bare solid copper wire to run with the triplex in the same 2" conduit? This is a 200amp house panel that it will be feeding.
#4
12-14-14, 05:58 AM
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3-wire URD is intended for direct burial and is extremely difficult to pull into conduit because of the way the three conductors are twisted. I would suggest just buying the 4-wire mobile home feeder and direct burying it to the house.
Shop 4/0-4/0-4/0-2/0 Aluminum Mobile Home Feeder Service Entrance Cable (By-the-Foot) at Lowes.com
If the soil is rocky and it must be in conduit, I wouldn't even attempt to pull it into anything smaller than 3" PVC.
Shop 4/0-4/0-4/0-2/0 Aluminum Mobile Home Feeder Service Entrance Cable (By-the-Foot) at Lowes.com
If the soil is rocky and it must be in conduit, I wouldn't even attempt to pull it into anything smaller than 3" PVC.
#6
12-14-14, 02:19 PM
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Great thanks, Does anyone know if the first 18" of conduit coming up out of the ground needs to be schedule 80? Right now I am planning on using schedule 40 grey electrical pvc conduit but I thought I read somewhere that the first 18" needs to be schedule 80 pvc? This will be the stand pipe coming up out of the ground and going to the bottom of the LB.
Thank you!!
Thank you!!
#8
12-14-14, 03:18 PM
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If the area where the conduit is to be installed is subject to physical damage (vehicle traffic, weed whips, rambunctious kids, etc.) then Sch 80 is required. Otherwise Sch 40 is fine.
#9
12-14-14, 04:41 PM
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If the area where the conduit is to be installed is subject to physical damage (vehicle traffic, weed whips, rambunctious kids, etc.) then Sch 80 is required.
#11
12-14-14, 08:06 PM
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Alot of times it is the POCO's call,riser must be away from traffic on the pole and a min. Of 8' above grade, but in this case the 8' would not apply.
Geo
Geo
#12
12-15-14, 08:04 PM
Group Moderator
Is that an NEC requirement or just a good recommendation?
Conduits installed on poles are required to be PVC Sch 80, RMC, IMC, or equivalent. 300.50(C)
