# NCCER Electrical L1/M11 MIX

Created 3 years ago

Duration 0:00:00
400
Slide Content
1. ### Slide 1

• Device Boxes 26111-14
• NCCER Electrical
• Level 1
• Residential Electrical Services
2. ### Slide 2 - Objectives

• When trainees have completed this session, they should be able to do the following:
• 1. Describe the different types of nonmetallic and metallic boxes.
• 2. Calculate the NEC® fill requirements for boxes under 100 cubic inches.
• 3. Identify the appropriate box type and size for a given application.
• 4. Select and demonstrate the appropriate method for mounting a given box.
• Device Boxes 26111-14
3. ### Slide 3 - Performance Tasks

• 1. Identify the appropriate box type and size for a given application.
• 2. Select the minimum size pull or junction box for the following applications:
• • Conduit entering and exiting for a straight pull.
• • Conduit entering and exiting at an angle.
• Device Boxes 26111-14
4. ### Slide 4 - 2.2.0

• Device Boxes 26111-14
• The general lighting load of the service entrance conductor is calculated by multiplying the buildings square feet by 3VA.
• 45’
• 65’
• 45’ X 65’= 2,925sqft
• 2,925sqft X 3VA= 8,775VA
5. ### Slide 5 - 2.2.0

• Device Boxes 26111-14
• To calculate how many circuits will be needed to support 8,775VA do the following steps
• 120v X 20a = 2,400VA
• 8,775VA / 2,400VA = 3.65 circuits
• (you cannot have partial circuits)
• 3.65 = 4 20amp Circuits to support light load
• You are allowed to go with the least allowed, in this case 4, but you do not need anymore than that.
6. ### Slide 6 - 2.3.1

• Device Boxes 26111-14
• NEC Section 210.11(C)(1) requires at least 2 120v, 20a small appliance branch circuits.
• They are usually installed in the kitchen.
7. ### Slide 7 - 2.3.4

• Device Boxes 26111-14
• NEC Section 220.53 permits the loads for four fixed appliances in a single-family dwelling only to be computed at 76% as long as they are not electrical heating, air conditioning, electric cooking, or electrical clothes dryer.
8. ### Slide 8 - 3.0.0

• Device Boxes 26111-14
• The neutral loads of the electric range and clothes dryer are permitted by NEC Section 220.61 to be computed at 70% of the demand for the phase conductors since these appliances have both 120v and 240v loads.
9. ### Slide 9 - 4.1.0

• Device Boxes 26111-14
• GFCI’s
• When a current imbalance occurs, the sensor, which is a differential current transformers, sends a signal to the solid-state circuit, which activates the ground trip solenoid mechanism and breaks the hot load connection
10. ### Slide 10 - 4.1.0

• Device Boxes 26111-14
• GFCI’s
• They are required in:
• Garages
• Bathrooms
• Kitchen Counters
• Outdoor Receptacles
11. ### Slide 11 - 4.1.0

• Device Boxes 26111-14
• GFCI’s
• An imbalance as low as 4 milli-amps can set it off!
12. ### Slide 12 - 5.1.0

• Device Boxes 26111-14
• The NEC says a few things can be considered as grounding points.
• Metal underground water pipe 10’ or more in contact with the earth.
• Metal frame of the building
• Electrode encased in 2” of concrete and the electrode must be 20’ long and electrically continuous.
• Rod driven 8’ into the earth.
13. ### Slide 13 - 5.1.2

• Device Boxes 26111-14
• The Grounding Electrode Conductor can be made of these materials.
• Copper
• Aluminum
• The GEC does not need to be identified by green, or green yellow markings if it is insulated
14. ### Slide 14 - 6.2.0

• Device Boxes 26111-14
• When the voltage to ground is only 300v or less, you are allowed to have the service drop over a residential driveway 12’ to its lowest point as opposed to 15’ if the voltage were higher.
15. ### Slide 15 - 7.0.0

• Device Boxes 26111-14
• NEC Section 230.70
• Require that the service disconnecting means be installed in a readily accessible location - either outside or inside of the building.
16. ### Slide 16 - 8.1.1

• Device Boxes 26111-14
• NM cable = Romex
• Romex is only a product by the brand Southwire, but is the most used NM cable used in industry.
17. ### Slide 17 - 8.1.4

• Device Boxes 26111-14
• Type USE and SE cable should be supported every 30” and used outside.
18. ### Slide 18 - 9.0.0

• Device Boxes 26111-14
• NEC Article 250, Part IV
• Generally requires that all metallic enclosures, raceways, and cable armor be grounded.
• Where located in wet locations
• Where electrical contact with metal
• Where equipment operates with any terminal at over 150v to ground
19. ### Slide 19 - 10.1.0

• Device Boxes 26111-14
• The feeder consists of all conductors between a service equipment and the final overcurrent device
• The conductors that extend from the panelboard to the various outlets are called branch circuits.
20. ### Slide 20 - 12.1.0

• Device Boxes 26111-14
• When the wall material is Combustible, outlets boxes must be installed flush.
• In wood or sheetrock would be two examples
• When the wall material is NON Combustible, outlet boxes can be recessed ¼” into the wall material.
• In plaster or stone would be two examples
21. ### Slide 21 - 16.0.0

• Device Boxes 26111-14
• NEC Article 680
• Cover the rules governing pools and such
• For hot tubs, at least one 120V 20A GFCI circuit must be installed within 10’ of the inside wall of the hot tub. See Figure 54
22. ### Slide 22 - Wrap Up

• 3-2-1
• 3 – Write 3 important things learned during class
• 2 – Write 2 questions you have about the material