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What Wire size for 225 amp commercial panel?
3/0 or250 aluminum
What is the temperature rating of THHN WIRE?
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.
What wire size for 125 amp service?
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.
What is the ampacity of an ACSR?
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
Can you double up on insulated wires for greater ampacity?
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).
