![]() ![]() ![]() Where the number of current-carrying conductors in a raceway or cable exceeds 3, the allowable ampacities shall be reduced per the table below. 10 copper, after any correction factors for ambient temperature and number of conductors have been applied.Īdjustment factors for more than three current-carrying conductors in a raceway or cable. * Unless otherwise specifically permitted elsewhere in the NEC NFPA70 Code, the overcurrent protection for conductor types marked with an asterisk shall not exceed 15A for No. Note: In the event of a conflict between the voltage drop table and the ampacity table use the larger wire size. Table X From ABYC E11 - CONDUCTORS SIZED FOR 10 PERCENT DROP IN VOLTAGE Likewise, when the length of the cord exceeds fifty feet there is a decrease in amperage. When a cord has three current carrying conductors there is a decrease in amperage. The watts generated at the conductor must be dissipated through the insulation to. Length of Conductor from Source of Current to Device and Back to Source - Feetġ2 Volts - 3% Drop Wire Sizes (gauge) - Based on Minimum CM AreaĢ4 Volts - 3% Drop Wire Sizes (gauge) - Based on Minimum CM Area The amperage rating of a cord is a function of the wire gauge, number of current carrying conductors and length of the cord. Assigning a current rating to a wire is really a problem of wire transfer. Note: In the event of a conflict between the voltage drop table and the ampacity table, use the larger wire size. Use the amp chart below to look up the rated amperage of different sizes and types of cords. Table IX From ABYC E11 - CONDUCTORS SIZED FOR 3 PERCENT DROP IN VOLTAGE Wire Ampacity Calculator Enter the information below to calculate the maximum allowable ampacity for current-carrying conductors. Data provided on this page is subject to change based on different manufacturers variances. Use the conductor length, the system voltage, and the ampacity, in conjunction with the appropriate volt drop table, i.e., 3 percent or 10 percent – TABLE IX or TABLE X, to determine conductor size. ![]() To use TABLE IX and TABLE X, measure the length of the conductor from the positive power source connection to the electrical device and back to the negative power source connection in feet. ![]() In the event of a conflict between the ampacity table and the voltage drop tables, the larger conductor size shall be used. Check the conductor size for compliance with the maximum allowable voltage drop. Conductors used for lighting, other than navigation lights, and other circuits where voltage drop is not critical, shall be sized for a voltage drop not to exceed 10 percent.Ĭonductor Size - To determine conductor size use TABLE IX or TABLE X. A wire with greater resistance will dissipate a greater amount of heat energy for any given amount of current, the power being equal to PI2R. V oltage Drop - Conductors used for panelboard or switchboard main feeders, bilge blowers, electronic equipment, navigation lights, and other circuits where voltage drop must be kept to a minimum, shall be sized for a voltage drop not to exceed three percent. The amplifier manufacture has provided that 4 gauge input IN CASE it is used as the sole amplifier in the system. ![]()
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