3/0 or250 aluminum
THHN wire is moisture resistant thermoplastic allowed for use in dry and wet locations. Maximum temperature is 60 C or 140 F. Being thermoplastic it should not be handled below 0 C as cracking of the insulation could easily occur.
The short answer, if using copper, is 0 AWG, commonly referred to as 1/0 or "one ought". Type of wire depends on location & temperature, but in my common scenario I am using 1/0 THHN inside a 2" schedule 40 PVC conduit (3 - 1/0 wires plus a 4 ga bare ground) to run indoors, a distance of about 25 feet from my main panel to a sub for upstairs. I could go into more detail regarding outdoor, direct burial, grounding, aluminum wire, etc but would need more details.
WIRE AMPACITY TABLE ACSR DIA.(OUt) CCC 795MCM 1.093" 900 A 556.5MCM 0.927" 730 A 336.4MCM 0.721" 530 A 4/0 0.563" 340 A 3/0 0.502" 300 A 2/0 0.447" 270 A 1/0 0.398" 230 A 2 0.316" 180 A 4 0.250" 140 A 6 0.198" 100 A
According to the 2008 National Electrical Code, the smallest wire that can be run in parallel is a 1/0 AWG (American Wire Gauge). If the wire you are using is smaller than a 1/0 AWG, you will need to increase the size of the wire to handle the amperage (Table 310.16 of the NEC).
3/0 or250 aluminum
Copper wire gauge sizes are not equivalent to aluminum wire gauge sizes. The gauge sizes for copper and aluminum wires are different due to their differing electrical conductivity properties. It is not possible to directly convert a copper wire size to an equivalent aluminum wire size.
A 4/0 copper wire can typically carry about 230-260 amps of current. The actual ampacity can vary depending on factors such as installation method, temperature, and insulation type. It is important to consult the National Electrical Code (NEC) or a licensed electrician for specific ampacity ratings.
For a 100 amp sub panel located 250 ft from the main panel, you would typically need to use 3/0 aluminum wire or 2/0 copper wire to ensure efficient power transmission and voltage drop within acceptable limits. It is recommended to consult with a licensed electrician to ensure the appropriate wire size and materials are used for your specific setup.
The maximum ampacity for 4/0 copper wire is approximately 230 amps when used in a building or residential wiring application. This rating may vary depending on the specific insulation type and local electrical codes, so it's always best to consult with a qualified electrician for accurate information.
THHN wire is moisture resistant thermoplastic allowed for use in dry and wet locations. Maximum temperature is 60 C or 140 F. Being thermoplastic it should not be handled below 0 C as cracking of the insulation could easily occur.
The weight of 3/0 copper wire is approximately 559.5 pounds per 1000 feet. So, the weight of 3/0 copper wire per foot would be approximately 0.5595 pounds.
120/240 single phase dwelling NEC 310.15(B)(6) #4 copper or #2 Al otherwise, NEC 310.16 #3 copper THHN or #1 Al THHN 2/0 Aluminum. <<>> A #3 copper conductor with an insulation factor of 75 or 90 degrees C is rated at 100 and 115 amps respectively. A #1 aluminum conductor with an insulation factor of 75 or 90 degrees c is rated at !00 and 115 amps respectively.
3/0 wire 3/0 wire
For a 150 amp service entrance cable, you would typically use 2/0 AWG (American Wire Gauge) copper or 4/0 AWG aluminum cable. This size provides the necessary capacity to handle the electrical load of a 150 amp service. It's recommended to consult with a licensed electrician for specific guidance based on your local electrical code requirements.
The short answer, if using copper, is 0 AWG, commonly referred to as 1/0 or "one ought". Type of wire depends on location & temperature, but in my common scenario I am using 1/0 THHN inside a 2" schedule 40 PVC conduit (3 - 1/0 wires plus a 4 ga bare ground) to run indoors, a distance of about 25 feet from my main panel to a sub for upstairs. I could go into more detail regarding outdoor, direct burial, grounding, aluminum wire, etc but would need more details.
A zero gauge wire can typically handle up to 300 amps of current. However, the exact capacity may vary depending on the specific wire material and insulation used in the wire. It is important to consult the manufacturer's specifications for the wire you are using to determine the exact ampacity.