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DAY 4 CHAPTER 3 CONDUCTOR SIZES,TYPES, ETC.

DAY 4 CHAPTER 3 CONDUCTOR SIZES,TYPES, ETC. Continuous Load. A load where the maximum current is expected to continue for 3 hours or more. Continuous loads shall not exceed 80% of the rating of the Branch circuit. CIRCUIT BREAKERS ARE THE FINAL OVERCURRENT PROTECTION DEVICE.

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DAY 4 CHAPTER 3 CONDUCTOR SIZES,TYPES, ETC.

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  1. DAY 4 CHAPTER 3 CONDUCTOR SIZES,TYPES, ETC.

  2. Continuous Load. A load where the maximum current is expected to continue for 3 hours or more. Continuous loads shall not exceed 80% of the rating of the Branch circuit CIRCUIT BREAKERS ARE THE FINAL OVERCURRENT PROTECTION DEVICE Branch Circuit. The circuit conductors between the finalovercurrent device protecting the circuit and the outlet(s). BRANCH CIRCUIT HAS 3 PARTS 1. CIRCUIT BREAKER 2. CONDUCTOR 3. DEVICES THERE ARE 4 TYPES OF BRANCH CIRCUITS. 1. SMALL APPLIANCE. 2. INDIVIDUAL 3. GENERAL PURPOSE 4. MULI-WIRE. Branch Circuit, Individual. A branch circuit that supplies only one utilization equipment. Branch Circuit, Appliance. A branch circuit that supplies energy to one or more outlets to which appliances are to be connected Branch Circuit, General-Purpose. A branch circuit that supplies two or more receptacles or outlets for lighting and appliances. Branch Circuit, Multiwire. A branch circuit that consists of two or more ungrounded conductors that have a voltage between them, and a grounded conductor that has equal voltage between it and each ungrounded conductor of the circuit and that is connected to the neutral or grounded conductor of the system. TYPE NM CABLE MUST HAVE A BENDING RADIUS AT LEAST 5 TIMES THE DIAMETER OF THE CABLE.334.24 COLOR CODE FOR NM-B CABLE 6-32: FIXING RECEPTELES TO DEVICE BOXES AND FACE PLATES ALSO FOR PLASTIC BOXES. 10-32: CEILING FAN BOXES,GROUND SCREWS CONDUCTOR SIZE COLOR 14 AWG WHITE 12 AWG YELLOW 10 AWG ORANGE 8 AWG BLACK 8-32: ATTACHING MUD RINGS TO BOXES

  3. MAXIMUM OVERCURRENT FOR 14AGW = 15AMPS 12AGW = 20AMPS 10AWG = 30AMPS INDIVIDUAL BRANCH CIRCUIT HAS 1 HOT,1 NETURAL MULTI-WIRE CIRCUITS HAVE 2 HOTS, 1 NETURAL COLOR CODE WHITE IS RESERVED FOR NEUTRAL(GROUNDED CONDUCTOR) GREEN IS RESERVED FOR (GROUNDING CONDUCTOR), CAN ALSO BE BARE. BLACK, RED, ETC ARE HOT.(UNGROUNDED CONDUCTOR) 3 METALS ARE ALLOWED FOR CONDUCTORS 1.COPPER 2.ALUMINUM 3 COPPER CLAD ALUMINUM FOR A 15A CIRCUIT. FOR A 20A CIRCUIT.

  4. Branch Circuit. The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s).

  5. BRANCH CIRCUIT HAS 3 PARTS 1. CIRCUIT BREAKER 2. CONDUCTOR 3. DEVICES Feeder. All circuit conductors between the service equipment, the source of a separately derived system, or other power supply source and the final branch-circuit overcurrent device.

  6. Continuous Load. A load where the maximum current is expected to continue for 3 hours or more. Continuous loads shall not exceed 80% of the rating of the Branch circuit

  7. Some loads in homes are continuous, such as electric water heaters, central electric heating, A/C. For these loads branch circuit rating, conductors, and the overcurrent devices can’t be less then125% of the load. Example: A/C with a name plate rating of 40amps, requires conductors and a circuit breaker with a rating of

  8. CIRCUIT BREAKERS ARE THE FINAL OVERCURRENT PROTECTION DEVICE

  9. THERE ARE 4 TYPES OF BRANCH CIRCUITS. 1. SMALL APPLIANCE. 2. INDIVIDUAL 3. GENERAL PURPOSE 4. MULI-WIRE.

  10. Branch Circuit, Appliance. A branch circuit that supplies energy to one or more outlets to which appliances are to be connected and that has no permanently connected luminaires that are not a part of an appliance.

  11. Branch Circuit, Individual. A branch circuit that supplies only one utilization equipment.

  12. Branch Circuit, General-Purpose. A branch circuit that supplies two or more receptacles or outlets for lighting and appliances.

  13. SUPPLIES ONLY ONE PIECE OF EQUIPMENT

  14. Branch Circuit, Multiwire. A branch circuit that consists of two or more ungrounded conductors that have a voltage between them, and a grounded conductor that has equal voltage between it and each ungrounded conductor of the circuit and that is connected to the neutral or grounded conductor of the system.

  15. MAXIMUM OVERCURRENT FOR 14AGW = 15AMPS 12AGW = 20AMPS 10AWG = 30AMPS INDIVIDUAL BRANCH CIRCUIT HAS 1 HOT,1 NETURAL MULTI-WIRE CIRCUITS HAVE 2 HOTS, 1 NETURAL COLOR CODE WHITE IS RESERVED FOR NEUTRAL(GROUNDED CONDUCTOR) GREEN IS RESERVED FOR (GROUNDING CONDUCTOR), CAN ALSO BE BARE. BLACK, RED, ETC ARE HOT.(UNGROUNDED CONDUCTOR) 3 METALS ARE ALLOWED FOR CONDUCTORS 1.COPPER 2.ALUMINUM 3 COPPER CLAD ALUMINUM

  16. 200.7grounded circuit conductor, (A) (1) A conductor with continuous white or gray covering (2) A conductor with three continuous white stripes on other than green insulation (3) A marking of white or gray color at the termination 250.119 Identification of Equipment Grounding Conductors. (B) shall be permitted to be bare, covered, or insulated. Individually covered or insulated equipment grounding conductors shall have a continuous outer finish that is either green or green with one or more yellow stripes Ungrounded conductor (hot) can be any color Other than white, gray, green, or green with Yellow strips. (C)

  17. AMPACITY: CURRENT CARRYING CAPACITY OF A CONDUCTOR. THE ALLOWED AMPACITY OF CONDUCTORS IN RESIDENCES IS FOUND IN TABLE 310.16. THESE AMPACITIES ARE SUBJECT TO CORRECTION FACTORS FOR HIGH AMBIENT TEMPERATURES. THESE ARE FOUND AT THE BOTTOM OF T 310.16. p70-148 T310.16 IS FOR THREE OR LESS CONDUCTORS IN A RACEWAY OR CABLE. EXAMPLE: A 12AWG THHN COPPER CONDUCTOR AT 90°C IS RATED AT 30AMPS. IF THE AMBIENT TEMP. IS 56°C THE CORRECTION FACTOR IS 0.71. USING THIS GIVES; 30AMPSX0.71=21.3AMPS, THIS IS THE DERATED USABLE AMPERAGE FOR THIS 12AWG CONDUCTOR. IF THERE ARE MORE THEN 3 CONDUCTORS PRESENT A ADDITIONAL CORRECTION FACTOR MUST BE APPILED AND IS FOUND IN TABLE 310.15(B)(2)(a) p70-146

  18. (2)

  19. GIVEN THE SAME WIRE GAUGE SIZE, THE HIGHER ITS INSULATOR TEMPERATURE RATING IS, THE GREATER ITS AMPACITY WILL BE.

  20. EXAMPLE: WHAT IS THE NUMBER OF RECEPTACLES ALLOWED FOR 15A AND 20A BRANCH CIRCUITS HOW MUCH POWER CAN BE USED BY A 15A CIRCUIT? USING THE POWER EQUATION; APPLYING THE 80% AMPACITY CORRECTION FACTOR GIVES; WE ARE ALLOWED 180VA PER RECEPTACLE FROM 220.14(I) p70-59 USING DAVID’S RULE OF THUMB TO FIND # OF RECEPTACLES PER BRANCH CIRCUIT; FOR A 15A CIRCUIT.

  21. HOW MUCH POWER CAN BE USED BY A 20A CIRCUIT? USING THE POWER EQUATION; USING 80% AMPACITY CORRECTION FACTOR GIVES; GIVEN THAT 180VA PER RECEPTACLE FROM 220.14 USING DAVID’S RULE OF THUMB TO FIND # OF RECEPTACLES PER BRANCH CIRCUIT; FOR A 20A CIRCUIT.

  22. MAX. DISTANCE AROUND WALL CORNERS=12FT.

  23. Fixed panels are counted as wall space Sliding panels are not wall space

  24. Duplex One family

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