Temp Rating = 0

Conductor Material = 1

Conductor Size = 1

Current-Carrying Conductors = 1

Ambient Temperature = 5

Continuous Load = 0.8

Allowable Ampacity =

Step 1 =

Step 2 =

Step 3 =

Step 4 =

t_tms = [[15;20;25;0;0;0]; [20;25;30;15;20;25]; [30;35;40;25;30;35]; [40;50;55;35;40;45]; [55;65;75;40;50;55]; [70;85;95;55;65;75]; [85;100;115;65;75;85]; [95;115;130;75;90;100]; [110;130;145;85;100;115]; [125;150;170;100;120;135]; [145;175;195;115;135;150]; [165;200;225;130;155;175]; [195;230;260;150;180;205]; [215;255;290;170;205;230]; [240;285;320;195;230;260]; [260;310;350;210;250;280]; [280;335;380;225;270;305]; [320;380;430;260;310;350]; [350;420;475;285;340;385]; [385;460;520;315;375;425]; [400;475;535;320;385;435]; [410;490;555;330;395;445]; [435;520;585;355;425;480]; [455;545;615;375;445;500]; [495;590;665;405;485;545]; [525;625;705;435;520;585]; [545;650;735;455;545;615]; [555;665;750;470;560;630]]

t_amb_temp = [[1.29;1.2;1.15]; [1.22;1.15;1.12]; [1.15;1.11;1.08]; [1.08;1.05;1.04]; [1;1;1]; [0.91;0.94;0.96]; [0.82;0.88;0.91]; [0.71;0.82;0.87]; [0.58;0.75;0.82]; [0.41;0.67;0.76]; [0;0.58;0.71]; [0;0.47;0.65]; [0;0.33;0.58]; [0;0;0.5]; [0;0;0.41]; [0;0;0.29]]

Calculates the maximum allowable ampacity for most commonly used conductors rated 0-2,000 volts, when direct buried or installed in a raceway or cable assembly. NOTE: This template will not determine the maximum overcurrent protection allowed for a conductor.

- Temp Rating: Select the maximum operating temperature of the conductor used. See Table 1 for maximum operating temperatures.

- Conductor Material: Choose whether copper or aluminum conductors will be used.

- Conductor Size: Select the size of the conductors being used.

- Current-Carrying Conductors: Choose the number of current-carrying conductors that will be installed in the raceway or cable. Ungrounded conductors (hots) are always considered to be current-carrying conductors. Grounding conductors are never considered to be current-carrying conductors (2014 NEC 310.15(B)(6). Neutral conductors are considered to be current-carrying conductors in many applications but not always. See section 310.15(B)(5) of the 2014 National Electrical Code to determine when neutral conductors must be counted as current-carrying conductors.

- Ambient Temperature: Select the ambient temperature that the conductors will be installed in. If the ambient temperature is unknown, the calculator will default to 26° - 30° Celsius or 78° - 86° Fahrenheit. If the conductors will be installed in a circular raceway, exposed to sunlight on or above a rooftop, a temperature addition must be made to the ambient temperature. Use Table 2 to find the temperature that must be added to the ambient temperature if these conditions exist.

- Continuous Load: Choose yes if the load is a continuous load and no if it is not. Continuous loads are defined as loads where the maximum current is expected to continue for 3 hours or more.

- Allowable Ampacity: This is the maximum allowable ampacity for this application.

[https://infinitysw.s3.amazonaws.com/cengage/conductorsize1.png]

[https://infinitysw.s3.amazonaws.com/cengage/conductorsize2.png]

Calculate the allowable ampacity of a 3/0 AWG, THWN copper conductor, supplying a noncontinuous load, if the conductor is installed in an ambient temperature of 95° Fahrenheit and 7 current-carrying conductors will be installed in the raceway.

- Temp Rating: 75°C

- Conductor Material: Copper

- Conductor Size: 3/0 AWG

- Current-Carrying Conductors: 7-9

- Ambient Temperature: 31-35°C (87-95°F)

- Continuous Load: No

The allowable ampacity is 131.6.

Temp Rating

Conductor Material

Conductor Size

Current-Carrying Conductors

Ambient Temperature

Continuous Load

Allowable Ampacity

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