10 Most 14, Wire, Rating Galleries
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10 Most 14, Wire, Rating Galleries - Copper conductors of the identical size have three unique allowable ampacities. The equal is actual for aluminum (and copper-clad aluminum) conductors. The maximum allowable ampacities depend upon the conductor’s temperature score. For example, a three awg copper conductor with a temperature score of 60°c has a maximum allowable ampacity of eighty five amperes (a). The most allowable ampacity of the same 3 awg copper conductor with a temperature rating of 75°c is 100a. If the temperature score of the three awg copper conductor is 90°c, the allowable ampacity is 115a (see figure 2). The 1/3 provision in a hundred and ten.14(c)(1)(a) states that conductors with higher temperature scores may be installed if the equipment is listed and recognized to be used with such conductors. This indicates the ampacity of a 75°c conductor can be based at the 75°c column if all of the terminations are rated at the least 75°c. This additionally manner the ampacity of a ninety°c conductor can be primarily based on the ninety°c column if all the terminations are rated at the least 90°c. Be careful whilst the usage of the 90°c column due to the fact no system is listed and diagnosed to be used with ninety°c conductors other than man or woman lugs, terminal bars and device listed to be used on circuits over 600v. This 0.33 provision in a hundred and ten.14(c)(1)(a) additionally manner the ampacity of a 90°c conductor can be based totally at the seventy five°c column if all the terminations are rated as a minimum 75°c. As an instance, a thhn conductor can have 75°c termination on one quit and a 60/75°c termination on the opposite. A temperature rating of 60/seventy five°c approach the equipment has been listed for each 60°c and seventy five°c conductors; therefore, it's far permissible to apply the 75°c score if the set up conductor is rated at least seventy five°c. Because all of the connection factors in this situation have at the least a seventy five°c score, the conductor’s ampacity may be primarily based on the 75°c column (see determine 5).