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Appendix 3
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National Electrical Code Tables
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The National Electrical Code provides many tables that present information useful to the electrician in a concise and convenient way All of the tables are found in the code, a copy of which every electrician should have in the toolbox at all times Remember, the code is updated every three years, and you can obtain new copies from The National Fire Protection Association PO Box 9101 Quincy, MA 02269-9101 For your convenience, several of the most frequently used National Electrical Code tables are reprinted here The table numbers appearing in the actual Code have been retained
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TABLE 210-21 (b)(2) Maximum Cord- and Plug-Connected Load to Receptacle Circuit Rating (A) 15 or 20 20 30 Receptacle Rating (A) 15 20 30 Maximum Load (A) 12 16 24
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Source: Reprinted with permission from NFPA, National Electrical Code, Copyright 2005 National Fire Protection Association, Quincy, MA 02269 This reprinted material is not the complete and official position of the NFPA on the referenced subject, which is represented only by the standard in its entirety
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Copyright 2005 by The McGraw-Hill Companies, Inc Click here for terms of use
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APPENDIX THREE
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TABLE 210-21 (b)(3) Circuit Rating (A) 15 20 30 40 50 Receptacle Rating (A) Not over 15 15 or 20 30 40 or 50 50
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Source: Reprinted with permission from NFPA, National Electrical Code, Copyright 2005 National Fire Protection Association, Quincy, MA 02269 This reprinted material is not the complete and official position of the NFPA on the referenced subject, which is represented only by the standard in its entirety
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TABLE 210-24 Summary of Branch-Circuit Requirements Circuit Rating Conductors (Min Size) Circuit wires Taps Fixture wires and cords Overcurrent protection 15 A 20 A 30 A 40 A 50 A
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14 14
12 14
10 8 6 14 12 12 Refer to Section 240-4 30 A 40 A 50 A
15 A
20 A
Outlet devices: Lampholders Any Permitted Type Receptacle 15 Max A Rating Maximum load Permissible load
Any Type 15 or 20 A 20 A
Heavy Duty 30 A 30 A
Heavy Duty 40 or 50 A 40 A
Heavy Duty 50 A 50 A
15 A
Refer to Refer to Refer to Refer to Refer to Section Section Section Section Section 210-23 (a) 210-23 (a) 210-23 (b) 210-23 (c) 210-23 (c)
These gages are for copper conductors For receptacle rating of cord-connected electric-discharge lighting fixtures, see Section 410 30(c) Source: Reprinted with permission from NFPA, National Electrical Code, Copyright 2005 National Fire Protection Association, Quincy, MA 02269 This reprinted material is not the complete and official position of the NFPA on the referenced subject, which is represented only by the standard in its entirety
NATIONAL ELECTRICAL CODE TABLES
TABLE 220-54 Demand Factors for Household Electric Clothes Dryers Number of Dryers 1 4 5 6 7 8 9 10 11 12 22 23 24 42 43 and over Demand Factor (Percent)
100% 85% 75% 65% 60% 55% 50% 47% % = 47 (number of dryers 11) 35% % = 35 [05 (number of dryers 23)] 25%
FPN No 1: See Example D5 (A) in Annex D FPN No 2: See Table 22056 for commercial cooking equipment FPN No 3: See the example in Annex D
Engineering Supervision Under engineering supervision, conductor ampacities shall be permitted to be calculated by means of the following general formula: I= TC ( TA + TD) RDC(1 + YC)RCA
where TC = conductor temperature in degrees Celsius ( C) TA = ambient temperature in degrees Celsius ( C) TD = dielectric loss temperature rise RDC = DC resistance of conductor at temperature TC YC = component AC resistance resulting from skin effect and proximity effect RCA = effective thermal resistance between conductor and surrounding ambient
APPENDIX THREE
TABLE 220-55 Demand Factors and Loads for Household Electric Ranges, Wall-Mounted Ovens, Counter-Mounted Cooking Units, and Other Household Cooking Appliances over 1 3/4 kW Rating (Column C to be used in all cases except as otherwise permitted in Note 3) Demand Factor (Percent) (See Notes) Number of Appliances 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Column A (Less than 3 1 / 2 kW Rating) 80 75 70 66 62 59 56 53 51 49 47 45 43 41 40 39 38 37 36 35 34 33 32 31 30 Column B (3 1 / 2 kW to 8 3 / 4 kW Rating) 80 65 55 50 45 43 40 36 35 34 32 32 32 32 32 28 28 28 28 28 26 26 26 26 26 Column C Maximum Demand (kW) (See Notes) (Not over 12 kW Rating) 8 11 14 17 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
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