If you are not pulling more than 150 amps at any time your voltage drop will still be less than 5% or 3% at 100 amps. Voltage drop will depend on the load on the feeder. Note: If it is direct burial, you need to use an insulated ground.ģ) IMO you will be fine with 4/0 aluminum. Remember, you are required to have the conduit fully assembled before installing the wire. But you will find, even with untwisting the wires, getting them into the conduit will be a challenge even with very large conduit. (hots) The ground can be reduced per table 250.122Ģ) Yes, you may install URD in conduit if you choose. The neutral can be reduced in size, but I tend not to because I can not guarantee that the load will be balanced between the ungrounded conductors. This should not be confused with the "grounding conductor", which is the ground, and should never carry current except during a fault. The neutral wire is called the "grounded conductor" because it is intentionally grounded, and carries current. Remembering horror stories about Al wiring is still wanting me to go with copper but other information has told be that the Al problems have been solved with better alloys.Ī conductor is a wire that is used to carry electrical power. Again not sure if all wires need to be the same as in copper conductors 3/0-3/0-3/0, or 4/0-4/0-4/0, #6 insulated or Aluminum 4/0-4/0-4/0 or 250-250-250 mcm, #6 insulated Copper Ground? (noting that less voltage drop for a 4/0 copper or 250 mcm choices $$$ for copper not a big increase for AL to 20 mcm). I was told be the electric company that 3/0 copper would likely be sufficient. My concern was is the "UL" designation which I believe to be an insulation reference suitable for installation in a conduit?ģ. If they are twisted, they could be easily untwisted when taken off the reel. The 4/0-4/0-2/0 AL Triplex UD at $2.64 per linear foot are individual conductors and are loose and not covered with a sheath. Is the neutral wire called a conductor? Do all three wires (excluding ground at #6 insulated) in the 200 amp service need to be the sized the same or can the "neutral" wire be smaller?Ģ. The wife wants the house completed, go figure.ġ. I just picked up the 12-inch backhoe bucket from a friend and I am ready to trench and do this. I also need to make sure I understand the best way to make the connections a the panel-use protective coatings? Others, I have discussed this with recommend going up one size to 250 mil and I was thinking all conduits would be the same size as in 4/0-4/0-4/0 AL and #8 copper bear. This seams like a good deal but I am not sure the UL insulation is adequate. Local store has a 4/0-4/0-2/0 AL triplex UD for $2.64 a linear foot. This leaves the main conductors sizes and insulation type. My questions: 1) how much more conductor should I buy to make connections? 2) Granted I will use Schedule 40 in buried section do I need schedule 80 for the risers? 3) I will run a ground wire in conduit, likely #8 bare copper. 4' bottom of panel to ground +2.5' underground+170' horizontal +2.5' back up + 3.0 to bottom of panel= 170+12 = 182' and gives me my estimate for minimum conduit length. I need to connect a 200 amp load center at the house to the 200 amp metered panel with conductors in a conduit.
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