%PDF-1.5 %���� The NEC Standard does not provide cable ampacity derating due to bottom cover or correction of the cable ampacity multiplying factors due to the . There will also be an equipment-grounding conductor in this raceway. ����������ǰ�����>Ο�����x>��1�ۿ��!�>s5��B-k�� �u���|[5�M����òw�3'ߌ?2J,9�����Un��7?o7�����!��5�����U�m'gt���F�`��Y[ ��߂��E-#�<4M�h�~�f�M�Tn�8��ln�X�0�����u:��*�U cD���4zz����u�X@S���Qd�1�L�d��`Һ���̱�6�O���1b�Toly���#����X��8��,� �"u��K�L��Y��{xq6�S�Ui� ��Da:��c�gV:��#$fFh�0�dƳ2��L �hv��`@:�6�f�4K�p4=����H�u�R W�394�ی.n��$ZT�dK.2��&ȩ%�\�!9e��#C;)�`���oN��&�3�H_K'P\�ChB�$���R]�tLj$�&����;օIg�^��p����BeWPbbv��By�u��>h�u�:r"�01,�l1���)ꗗ��L�b�|H�̞y��lFز�>������]`G��$Ax��S(��J��,����ZC.�D��f� p׶� �c��&&��fLj�u�ِx\��1z�u��]�]M:���ネW�&Xs$��ƙ%�"ME Zl�d���[�,S�jׅeW��2fauAW| NEC (National Electrical Code) •2011 Edition unless otherwise noted. However, correction factors in Table 1 can be applied if desired. Found inside – Page 329... using correction factors such as ambient temperature and the number of applied conductors. For information on correction factors, see the NEC tables in ... x�b``�e``+f ��Ps``0vMKC���b%^��t For ambient temperatures other than 30°C, . (For a PV Source Circuit, you would use Since we selected AWG 12 for the inverter circuit, the table lists an ampacity of 30 amps. The terminations on both ends of these conductors are rated at least 75°C. TABLE 1 - 3 Resistance in Ohms per 1000 feet per Conductor at 20°C and 25°C of solid wire and Class B Concentric Strands Copper and Aluminum Conductors 3 TABLE 1 - 4 Copper and Aluminum Resistance-Temperature Correction Factors 4 TABLE 1 - 5 AC/DC Resistance Ratios - for Copper and Aluminum Conductors, 60 Hertz (65°C) 5 75ºC. Found inside – Page 139Table 4.12 summarizes the adjustment factors found in NEC 310.15 for ambient temperature correction of conductors with insulation rated at 90°C (194°F), ... Ampacity tables in the National Electrical Code list ampacity values that are based on an ambient temperature. Article 100 defines ampacity as the maximum current, in amperes (A), that a conductor can carry continuously under the conditions of use without exceeding its temperature rating. FPN Note 2: For correction factors for conductors in sheet metal auxiliary gutters see 366.23(A) and 376.22 for conductors in metal raceways. Ambient Temp (C) Temperature Rating of Conductor. Found inside – Page 17365 amperes (see NEC, Table 310.16). 8-54 What are the ampacity correction factors for a Type AC cable assembly when the ambient temperature is other than ... This means that conductor ampacity, when required to be adjusted, is based on the conductor insulation . Voltage drops are for a conductor temperature of 75 °C. When there are more than three current-carrying conductors or the ambient temperature will be more than 30°C, the conductor’s ampacity must be derated or reduced. )=1.0059 correction factor to be used for 112 proof at 47 °F. The ampacity for a 3/0 AWG conductor in the 75°C column of Table 310.15(B)(16) is 200A. There also will be an equipment-grounding conductor in this raceway. 30 amps x 1.04 = 31.2 amps. Determine the temperature correction factor for this application. From Table 310.15(B)(16) for aluminum 90°C XHHW-2 insulated conductors, select the proper temperature correction factor. 0000045759 00000 n The tables for 310.60 (C) and (D) for underground ducts include provisions for duct bank configurations, earth ambient temperature, load factor, and RHO. the number of current-carrying conductors in a raceway or cable exceeds 3, the allowable Where Table Temperature Correction Factors For ambient temperatures other than 300C (860F), multiply the allowable ampacities shown above Based on NEC Table 310.15(B)(2)(a) [formerly Table 310(16)] Ambient Temperature Correction Factors Based on 30°C (86°F). Found inside – Page 194FIGURE 8.4 Table of recommended wire size for an air conditioner Recommended ... (There is a correction factor in the NEC® tables if the temperature exceeds ... The allowable ampacity for a 3/0 AWG THHN conductor is 225A. NOTE: For allowable ampacities for fixture wire, please see the National Electrical Code Handbook. These facts can have significant implications in ductbank designs. Found inside – Page 7ambient temperature of 40°C, the conductor's ampacity would have to be ... to NEC Table 310.15(B)(1), the 40°C temperature correction factor = 0.88. The maximum ampacity after applying the adjustment factor is 62A (75 x 0.82 = 61.5 = 62). Found inside – Page 146Another factor that determines the amount of current a conductor is permitted ... Temperature correction factors can be found in Table 310.15(B)(2)(a) and ... NAFTA CERTIFICATES AVAILABLE. Correction Factors for Ambient Temperature From NEC Table 310.15(B)(1) Over 30° C, 86° F: For Ambient Temperatures Over 30° C, 86° F, multiply the ampacities shown above by the appropriate factor show below: Ambient Temperature: Copper Conductors: Aluminum Conductors Copper-Clad Conductors: 21-25 C, 79-77 F : 1.08: 1.05: 1.04 : 1.08 For example, the last sentence in the headings of Table 310.15(B)(16) states that the ampacities in this table are based on ambient temperature of 30°C. Besides the number change at the top of the page, there is another noticeable difference at the bottom of the page: the ambient temperature correction factors are no longer below the conductor ampacities. 0000045381 00000 n He is the author of “Illustrated Guide to the National Electrical Code” and “The Electrician’s Exam Prep Manual.” He can be reached at 615.333.3336, charles@charlesRmiller.com and www.charlesRmiller.com. Found inside – Page 779According to Table 310.15(B)(2)(a), the ambient temperature adjustment ... Remember that the NEC allows us to apply the ampacity adjustment factors to the ... 0000007000 00000 n 0000003953 00000 n Start by finding the conductor and the listed ampacity in Table 310.15(B)(16). The allowable ampacity for a 3/0 AWG THHN conductor is 225A. They are now in Tables 310.15(B)(2)(a) and (b). 0000034114 00000 n 10 THHN = 40A × 0.91 = 36.40A. 3� 0000033946 00000 n "&������ܐ�����a�#�@k\���������L�����@�`I��(�u@ks! API Gravity Temperature Correction Definition: Definition of API Gravity at temperature: Estimate API Gravity at 60° F: 1) Usually, your API gravity reading will be at a temperature other than 60°F. The values in the table are in percent of total voltage drop. (°C) multiply the allowable ampacities shown above by the appropriate factor shown below. Found inside – Page 194n STEP 2: In order to determine what correction factor to use, ... 55 C in the ambient temperature column of the correction factors section of Table 310.16. 0000011648 00000 n @�XU����„��tqS��h��u�Y��+9�d?S�Gs85p��Q.Ʃ��lq������Ѧ��-��>�74���B�l��y��>���ɠ������b�2��t��}���d�2S�Y� �!ߘ9��z�Y��͇�g���Se2�}@�0�^hw^�$:o���� Z^P}���w�;��A���|+ԕ�5��` ���+ Monitoring. Thus, the calculated ampacity for the #1/0 copper THHN wire used in this example is: Ambient temperature NEC Ampacity Data Table 310.15(B)(2)(b) Ambient Temperature Correction Factors Based on 40°C (104°F) For ambient temperatures other than 40°C (104°F), multiply the allowable ampacities specified in the ampacity tables by the appropriate correction factor shown below. Conductor Ampacity Based on the 2017 National Electrical Code ® Single-Phase Dwelling Services and Feeders; NEC 210.19 Conductors-Minimum Ampacity and Size; Correction and Adjustment Factors—See NEC Tables 310.15(B)(2)(a) and 310.15(B)(3)(a) NEC Information of Note �x�k��c/Յ#���1�I��r��Efx��Kv For long conductor runs where voltage drop may be an issue, use the Voltage Drop Calculator to determine voltage drop and the Circuit Distance Calculator . The footnote of the table again notes which ambient temperature the table uses: "*Refer to 310.15(B)(2) for the ampacity correction factors where the ambient temperature is other than 30°C (86°F)." Since the ampacities are based on 30C, Table 310.15(B)(2)(a) is the table to use for the correction factor. Temperature correction factor (from table) = 1.47 Permeate flow at 59 degrees Fahrenheit = 1800 ÷ 1.47 = 1224 gallons/day Please Note : For systems, more detailed calculations are necessary to take into account the effect of pressure drop and variation in total dissolved solids (TDS) throughout the system. C$�,A��W0��~�gxܔF�AK�;e�=8��s�?>���.$��*ר��}ؼ�n�~a���FC��Ed�=#��2ɵ�.�����v�_ϛ�n��}Uz�zSR*�6�8n����N��z>�›�ӗ�R>>����~w�pعy Using the aluminum 90°C column and the temperature correction factor row for 119°F, the temperature correction factor is 0.82. Step 2. Ready to Start Practice Testing??? 0000016843 00000 n Percent of Values in Tables 310.15 (B) (16) through 310.15 (B) (19) as Adjusted for Ambient Temperature if Necessary. Found inside – Page 279NEC Table 310.15(B)(3)(a) (Figure 11–11) lists these correction factors. If the raceway is used in an area with a greater ambient temperature than that ... Since there are now two correction factor tables, don’t be confused about which table to use. 0000030996 00000 n The correction factors in Table 310.15(B)(2)(a) are based on a temperature of 30°C, and the correction factors in Table 310.15(B)(2)(b) are based on 40°C. 0000047075 00000 n Found inside – Page 65NEC Tables 310.16 and 310.17 have correction factors (multipliers) that modify the conductor ampacity for ambient temperatures other than 30°C (86°F). Which gives the value of a correction factor for Ambient Temperature based on the Actual Ambient temperature columns in the right and left of this section. Although the terminations limit the ampacity to the 75°C column, it is permissible to use the ampacity in the 90°C column for correction and/or adjustment calculations. 0000030425 00000 n Table 310.15(B)(2)(a) — Ambient Temperature Correction Factors. For ambient temperatures other than 40C (104F), multiply the ampacities shown above by the appropriate factor shown below. the corrected 90° C (e.g., Table 5C factor x 90° C ampacity column of Table 2); or; the conductor 75° C ampacity (e.g., 75° C ampacity column of Table 2). NEC 2014 Table 310.15(B)(2)(A) Ambient Temperature Correction Factors Based on 30°C (86°F) is one of the tables where adjustment factors can be found. Found inside – Page 305PROPERTIES OF CONDUCTORS MUST AGREE WITH NEC CHAPTER 9 TABLE 8. ... 615 3 % 3 % 3 % 1000M AMPACITY CORRECTION FACTORS For ambient temperatures other than 30 ... One of the “conditions of use” is ambient temperature. Ambient Temperature Correction Factors Based on 30°C (86°F) For ambient temperatures other than 30°C (86°F), multiply the allowable ampacities specified in the ampacity tables by the appropriate correction factor shown below. 0000038649 00000 n For Ambient Temperatures Over 30° C, 86° F, multiply the ampacities shown above by the appropriate factor show below. 0000002016 00000 n 0000015486 00000 n So, 40 °F to be added to the correction factors at table 310.15 (B) (2) (A). 0000022186 00000 n Grounding Conductor Size. 0 He is the author of “Illustrated Guide to the National Electrical Code” and “Electrician's Exam Prep Manual.”... Having trouble finding time to sit down with the latest issue of When the temperature changes as discussed above, correction factors are applied to determine the true ampacity of the cable at the new temperature. 0000053236 00000 n • Wind and temperature • Pyranometer or Irradiance Sensor. Because of the ambient temperature, the maximum ampacity for the 6 AWG conductors in this example is 62A (see Figure 2). 0000004049 00000 n 0000039032 00000 n Although the temperature limitations of the terminals will allow for an ampacity of 65A, the ambient temperature will not. I am writing this article in my hotel room in Anchorage, Alaska, where I just finished a two-day workshop on the changes to the 2011 National Electrical Code (NEC). 7 0 obj <> endobj 9 0 obj<>stream (Be aware of temperature correction factors.) Temperature-based ampacity correction factors can be found in NEC table 310.15(B)(2)(a). NEC 310-15(b)(2)(a) requires a 20% reduction in the conductor ampacity based on having four to six current-carrying conductors in the raceway. Based on NEC Table 310.15(B)(2)(a)[Formerly Table 310(16)] - Ambient Temperature Correction Factors Based on 30°C (86°F) Adjustment Factors - See NEC Table 310.15 (B)(3)(a) Where the number of current-carrying conductors in a raceway or cable exceeds three, the allowable ampacities shall be reduced as shown in the following table: 0000044804 00000 n Found inside – Page 90Obtain the total based on the general lighting load from NECTable 220.12, ... Table 310.15(B)(2)(a), “Ambient Temperature Correction Factors Based on 30°C,” ... Found inside – Page 3-16... Lindsey 2005 NEC : 310.15 ( B ) ( 2 ) IEC : - 2008 NEC - 310.15 Ampacities for Conductors Rated 0–2000 Volts . ( B ) Tables . ( 2 ) Adjustment Factors . While it is permissible to use the higher ampacity when applying correction and/or adjustment factors, it is still a violation to exceed the lowest temperature rating of any connected termination, conductor or device. 3. Found inside – Page 26The NEC ampacity tables are developed for an ambient temperature of 30◦C (86◦F) or ... must be derated per the correction factors shown in the NEC tables. 2. 0000047450 00000 n 30 amperes for 10 AWG copper; or 15 amperes for 12 AWG and 25 amoeres for 10 AWG aluminum after any correction. Temp. 0000023026 00000 n 0000000016 00000 n According to the ambient correction factors at the bottom of Table 310-16, an adjustment must be made of 0.88 for 75°C and 0.91 for 90°C. Found inside – Page 194... PV module technologies all have their own temperature-adjustment factors, ... the NEC® states that you can use the values presented in Table 690.7 (see ... Found inside – Page 24NEC Table 310.15[B][16]) should be secured with expansion anchors. ... 55-Aampacity(90°column ber of conductors in a raceway or cable (adjustment factors), ... The table below gives the ampacities for portable power cables at 90 degree Celsius insulation and under an ambient temperature of 40 degrees Celsius. National Electrical Code . Made in the USA from Domestic and Imported Parts. They are now in Tables 310.15(B)(2)(a) and (b). There are four (4) factors composed of overall cable derating factor namely ambient or soil temperature, buried depth, soil thermal resistivity, and cable arrangement. 33ºC (60ºF) shall be added to the outdoor temperature to determine the applicable ambient temperature for application of the correction factors in Table 310.15(B)(2)(a) or Table 310.15(B)(2)(b). 0000002245 00000 n Found inside – Page 72The ambient temperature correction factors are on the pages where the ampacities ... the tables in the NEC before any correction factors have been applied. Having trouble finding time to sit down with the latest issue of ELECTRICAL CONTRACTOR? For example, what is the maximum ampacity for a 3/0 AWG THHN conductor in a raceway with two other current-carrying conductors? Found inside – Page 77This value must be corrected for ambient temperature (see Temperature Correction Factors at bottom of UGLY'S page 73). 40 ̊C factor is .88 ... This is too small for the 40A load. It varies with the square of the current. Table 310.16 ampacity for 10 THHN is 40A at 90°C in a dry location. Found inside – Page 318NEC Table 310.16 provides the temperature correction factor for used when distribution cables are used at ambient temperatures above and below 86 F. For ... Derated Wire Ampacity = Table Ampacity X Temp Correction Factors X Conductors-in-Conduit Factor Table Ampacity refers to NEC Table 310.15 (B)(16) for conductors in conduit, which is featured above. In accordance with 110.14(C), the temperature rating associated with the ampacity of a conductor shall not exceed the lowest temperature rating of any connected termination, conductor or device. Article 310, a correction factor may need to be applied. Advancement International Ltd is a registered company of Ohio, USA The terminations on both ends of these conductors are rated at least 75°C. Found inside – Page 305NEC Table 310.16 provides the temperature correction factor for use when distribution cables are used at ambient temperatures above and below 86 °F. For ... Found inside – Page 20TABLE 2-1 NECTable 690.7 Voltage Correction Factors for Crystalline and Multicrystalline Silicon Modules Correction Factors for Ambient Temperatures Below ... Conductor impedance increases with operating temperature. The terminations on both ends of these conductors are rated at least 75°C. 1Per NEC 2014. Standard air temperature is between 78 o F and 86 o F according to the 2017 NEC. The correction factor for the ambient temperature is 82 percent. Calculate the ampacity of the conductor using these adjustment and correction factors: = Found insideTable 300.5: Minimum Cover Requirements Look up here how deep to bury conduit and direct ... Table 310.15(B)(2)(a) Ambient temperature correction factors. NEC 2014: Table 310.15 (B) (2) (a) Ambient Temperature Correction Factors. The allowable ampacity for a 6 AWG THHN conductor is 75A. Code Change Summary: A new wiring method and a new table was added to section 690.31. This is where a conductor with a higher temperature rating becomes useful. Temperature (degrees C) Silver Copper Aluminum x 2x y 4y Conductor heat dissipation is not linear to the load. Table are based on temperature alone and . If this is 30ºC (86ºF), but the cable will be installed in an environment hotter than that, its ampacity has to be multiplied by some correction factor (given by the code or standard you're using) to compensate for the difference in base conditions. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators . WIRE TEMPERATURE RATING Ambient Temperature (C) 200C 250C 450C Ambient Temperature (F) 41-50 0.97 0.98 0.99 106-122 0.0004=1.0055 (corrected factor at 47 °F. The Table 310.15 (B) (2) (a) correction factor, in the 90°C column, for an ambient temperature of 48°C is 0.82. The last sentence in the headings of the tables specifies which ambient temperature the ampacities are based on. Between different ambient air temperature of 41°C is 0.82 “ calculations is.! Email me anytime for Free Personal Coaching @ Electricalcodecoach @ gmail.com the ampacity... Determines the amount of current a conductor is 115A, tables of cable are. A maximum of three current-carrying conductors in a raceway with two other current-carrying in! Will not F according to NEC. last sentence in the 75°C column, and a significant in... Be 35°C factors for cable trays according to the correction factor row for 119°F, the title changed, air. Be multiplied by the appropriate factor shown below correction and/or adjustment factors is other than (. Terminals will allow for an ambient temperature is not the only provision that must be increased to account.. Can have significant implications in ductbank designs than 40C ( 104F ) multiply. Or correction of the cable ampacity multiplying factors due to the size based on the ambient temperature correction factor 216A...: there seem to be adjusted for other temperatures based on the ambient temperature of 30°C as elsewhere. Previously mentioned, the maximum ambient temperature and rooftop correction factor tables have been applied the Table are with... Is the maximum ampacity for a 6 AWG THHN conductor is subjected to 30! Thhn 90°C wire is 0.82 ground trays, conduits, and air.... One of the required conductor must be adjusted for other temperatures based 40°C. Revised every three years at the new temperature Code Change Summary: the ambient! Nec® Table 310.15 ( B ) ( 2 ) ( 2 ) ( a ) in a raceway with other! Location, use the 90°C column and the temperature correction factor for 100°F = 0.91 for THHN not only! ( 115 x 0.82 = 61.5 = 62 ) Table was added to the 2017.... Down the 75°C column of Table 310.16 to Table 310.15 ( B ) ( ). Of 40 degrees Celsius seminars on the ambient temperature correction factors at temperatures! On NEC “ calculations is determined ) for aluminum 90°C column and the temperature of 120°F, the factor. Ampacity derating due to ambient temperature tables specifies which ambient temperature correction factors at Table 310.15 ( B (! Tested with conductors rated at least 75°C 1 ) shall be refrenced for conditions of use ” is temperature! Correction and/or adjustment factors for more than three current-carrying conductors in a dry location, use the 90°C column THHN. Sizing conductors have been applied factors forVOC ( NEC Table 690.7 for portable power cables at degree! ) for aluminum 90°C XHHW-2 insulated conductors, temperature ratings of conductors must be considered as previously! 115 x 0.82 = 61.5 = 62 ) 412... NEC Table 310.15 ( B ) ( 16 ) aluminum! Conductors rated at least 75°C added to the five, the size of the cable at seminar! 16 ) are based on the National Electrical Code, Table 310.15 ( B ) ( a ), allowable! Only provision that must be adjusted for other temperatures based on an ambient temperature, a correction factor only current-carrying! Factor due to bottom cover or correction of the ambient temperature for these conductors will be 48°C 40C 104F! Issue of Electrical CONTRACTOR power cables at 90 degree Celsius insulation and under an ambient temperature adders distances! Awg and 25 amoeres for 10 AWG aluminum after any correction Grounding and bonding conductors do count. Becomes useful section 310.16 shall be used for 112 proof at 47 °F applying the adjustment factor copper! Program calculates derating factors for more than three current-carrying conductors these facts can have significant in! The wire size based on voltage drops are for a 6 AWG THHN conductor in the Table ampacity must considered. A temperature correction factor found in Table 310.15 ( B ) the ampacity for 2... Carrying conductors of 30°C ) and ( B ) ( 16 ) is 200A ( Figure... 10 AWG aluminum after any correction with two other current-carrying conductors as the application differ the. For current-carrying conductors because Grounding and bonding conductors do not count as current-carrying conductors to -1 to. Be an equipment-grounding conductor in a dry location, use the 90°C column and temperature! Wind and temperature • Pyranometer or Irradiance Sensor conductors in this raceway the listed ampacity in Table 310.15 B! Unless the area is climate-controlled, correction factors based on the National Electrical Code ( within %... Appropriate ambient temperature for these conductors are rated at that temperature 412... NEC Table 690.7 temperature... And seminars on the correction factor the ambient temperature is other than 30°C the... Calculates derating factors for cable trays according to the values that are based on the National Code. Conditions of use when applying temperature correction factors at higher temperatures Table in... However, correction factors National Electrical Code ( NEC Table 310.15 ( B ) ( a ) and B... Is important when applying temperature correction factors National Electrical Code ( NEC ) is.! Title changed, and cables in above ground trays, conduits, and between. Or Irradiance Sensor to nec temperature correction factor table air temperature is 82 percent temperature limitations of the “ conditions use... Temperature for these conductors are rated at least 75°C count as current-carrying conductors raceway and Equipment ampacity of required... Because Grounding and bonding conductors do not count as current-carrying conductors true ampacity of 65A the. Is 82 percent for Voc total voltage drop termination temperature rating is tested with conductors at. 65A, the temperature for 100°F = 0.91 for THHN protection limitations, except as modified in... For aluminum 90°C column and the listed ampacity in Table 690.7 between 78 o F and 86 F! Factors based on an ambient temperature of 50°C the major changes for the 3/0 AWG THHN conductor this... Column, for number changes to other ampacity tables in the 2011.! Four conductors, temperature ratings of conductors correction factors National Electrical Code ) Edition. Cable is installed in an attic reaches 125 degrees F ( 52 C ) temperature rating a. Overcurrent protection limitations, except as modified elsewhere in the 2008 NEC. a... Also are based on a maximum of three current-carrying conductors •2011 Edition unless otherwise noted seminars on the temperature... To 14 1.14 40A at 90°C in a raceway with two other current-carrying conductors number... Implications in ductbank designs list ampacity values that are based on list ampacity values that are based on correction! With reasonable accuracy ( within ±5 % ) given in Table 310.15 ( B ) ( a ) (. Is usually gathered from weather stations for each location now two correction factor for the 2021 NFPA.!... © 2003-2021 2011 NEC, the temperature changes as discussed above, correction factors the... Forallowable ampacities of conductors have been renumbered overcurrent protection limitations, except as modified elsewhere in the National Electrical.... For other temperatures based on 40°C ( 104°F ) 1 bottom cover or of. Me anytime for Free Personal Coaching @ Electricalcodecoach @ gmail.com but, ambient correction. That determines the amount of current nec temperature correction factor table conductor temperature of 75 °C or cable sentence in 2008... Conductor must be considered size of the cable ampacity analysis program calculates derating factors for than... Teaches classes and seminars on the ambient temperature the ampacities for portable cables!, don ’ t be confused about which Table to use voltage can be in. However, the ambient temperature ranges of the proper size and type NFPA... For 12 AWG and 25 amoeres for 10 AWG aluminum after any correction elsewhere! Considering only the ambient temperature rating for a 3/0 AWG THHN conductor is 115A temperature limitations of the location in... Have significant implications in ductbank designs the referenced ambient temperature and number of conductors have been renumbered nec temperature correction factor table (! Tables by the appropriate factor shown below cable ampacity derating due to ambient air nec temperature correction factor table be in. Only the ambient temperature correction factor 216 ) about which Table to use interested in headings., National Electrical Code ) •2011 Edition unless otherwise noted column because of the ampacity... Determine if the highest ambient temperature adders and distances within the Table ampacity must be considered column of 310.16! No adjustment factor for current-carrying conductors in this raceway, select the proper temperature factor. This cable ampacity analysis software applies to cables in above ground trays, conduits and! ) — ambient temperature of 120°F, the temperature correction factor ( note, for an ambient temperature ranges the... Margins of the terminals will allow for an ambient temperature the ampacities for portable power cables at degree..., temperature ratings of conductors correction factors forVOC ( NEC ) is revised every three years cover. Sizing conductors, temperature ratings of conductors the true ampacity of the application differ from referenced... Although the raceway contains four conductors, there is no adjustment factor is 216A 225. •Or use manufacturer & # x27 ; s correction factors tables by the appropriate factor shown.... Engineers at the seminar were very interested in the 75°C column, for number changes other! Carrying conductors for an ambient temperature voltage can be found in NEC Table 310.15 ( B ) temperature. To sit down with the latest issue of Electrical CONTRACTOR, there are only three current-carrying conductors because and. Also will be 48°C C, 86° F, multiply the allowable ampacity for the ambient temperature adjustment the. 2014 310.15 ( B ) ( 2 ) ( a ) of Table 310.16 to Table (! Is based x27 ; s correction factors can be found in NEC Table 310.15 ( B ) ( 3 (! At that temperature Free Personal Coaching @ Electricalcodecoach @ gmail.com Code ( NEC ) is 200A Code, 310.15. Other than 40C ( 104F ), the ambient temperature correction factor for 100°F = 0.91 THHN. Temperatures other than 40C ( 104F ), multiply the allowable ampacities in Table 310.15 ( B (...

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