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  • when to use 90 degrees ampacity conductor? | Information by Electrical . . .
    As per the NEC table Table 310 15 (B) (16), a 500 AWG conductor rated has an ampacity of 430 @ 90 degrees C However, most motors and ALL circuit breakers as far as my limited knowledge are not rated to properly operate at 90 degrees C However, most of the conductors we use are based on 90 degrees C ampacities
  • NEC Ampacity Tables : 310. 15 (B) (16) thru (21)
    Example 500MCM has 380 amp per 310 15 (B) (16) and 496 amps per 310 15 (B) (20) at 30 DEg C and 40 Deg C temperatures respectively Why the ampcities of these two tables are having huge difference in ampacities? is it just because of the ventilation?
  • Table310. 15 (B) (2) (a) or Table 310. 15 (B) (2) (b)
    If your wire type in question is not part of 310 15 (B) (16), and instead has its ampacity in a different table that assumes a 40C ambient for its default ampacity, then you would use table 315 15 (B) (2) (b)
  • table 310. 15 (B) (16) wire size | Information by Electrical . . .
    However, 110 14 (C) uses Table 310 15 (B (16) values to establish a conductor operating termperature (or heat sinking capability, if you wish) based on conductor size and the termination temperature rating
  • Table 310. 15 (B) (16). Which column? | Information by Electrical . . .
    Also keep in mind that the NEC limits small conductors in 240 4 (D) so that a #14 can only be protected by a 15 amp breaker, 20 amps for a #12 and 30 amps for a #10 except when the conductors supply equipment listed in 240 4 (E) or (G) table 240 4 (G) as protection for those conductors will be addressed in the sections listed in table 240 (G)
  • Proper use of Table 310. 15 B (2) (b). | Information by Electrical . . .
    Table 310 15 (B) (2) is for messenger supported conductors and the ampacity of the conductors in that table are based on an ambient of 40°C Using that table, if you have a 8 AWG copper conductor in the first, 75°C, column, its ampacity is 57 amps
  • Clarification in regards to Table 310. 15 (B) (6) and NEC 2014
    But again there is no table 310 15 (b) (6) in NEC 2014 Thus I refer to section 310 15 (B) (7) (2) in NEC 2014, which states that the feeder conductors shall have an ampacity not less than 83% of the feeder rating This then becomes 83% of 100A, which is 83A I then refer to Table 310 15 (b) (16), look at 75C for THW, and identify that for a 4AWG conductor, its allowable ampacity is 85A, which
  • NEC 2014, Table 310. 15 (B) (16) (formally table 310. 16)
    You don't have to use table 310 B (15) (16), and you don't have to bump up the conductor size You can still use the 4 0 aluminum XHHW The new approach to sizing services and feeders to individual dwelling units is to find a conductor (your choice) that has an ampacity of at least 83% of the calculated service or feeder load
  • Ampacity Rating of Conductor at 60 Degree C rated Termination
    What is ampacity rating of #12 AWG Copper with THWN-2 rated insulation at 60 Degrees Celsius? Should the correction factors in table 310 15 (B) (1) be used
  • Service wire size with 83% rule | Information by Electrical . . .
    All of the in between values which you get with 83% rule ? #1 0 copper is rated for150 amps at 75° C not 175 amps Take the size of the service OCPD and multiply by 83% then go to Table 310 15 (B) (16) and find a conductor that has at least that value That would be the minimum conductor size For example 300 amp service:





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