Chapter 2 Notes:

Question 1

Building Plans Overview:

Answer 1

• Plans are drawings showing materials, sizes, locations, and construction features. Prepared by architect/engineer, understand structure.

Question 2

Electrical Construction Specifications:

Answer 2

• Specifications provide details for all trade involved in construction, including material sizes, types, and qualities.

Question 3

Electrical Symbols (1 of 3):

Answer 3

Electrical symbols show device locations. A device carries or controls electrical energy, while an outlet connects to the wiring system.

Question 4

Electrical Symbols (2 of 3):

Answer 4

Lighting outlets connected to lamps, Split-wired receptacles, and junction boxes are used for estimating costs.

Question 5

Luminaries and Outlets:

Answer 5

Luminaries are complete lighting units with a light source and parts. Outlet locations depend on illumination type.

Question 6

Outlet, Device, and Junction Boxes (1 of 2):

Answer 6

NEC Article 314 specifies details for outlet and pull junction boxes. Boxes must be securely mounted.

Question 7

Nonmetallic Outlet and Device Boxes:

Answer 7

Nonmetallic boxes are commonly used in homes for their cost efficiency and circuit connectivity.

Question 8

Gang Switch (Device) Boxes:

Answer 8

Multiple gang boxes are used for installing several devices in one location, available in 2, 3, or 4-gangs.

Question 8

Box Mounting (4 of 5)

Answer 8

Fire spread must be contained, and NEC and building codes should be followed for fire-resistance ratings.

Question 9

Box Mounting (2 of 5)

Answer 9

Consider damage control when wiring. Properly locate remodel boxers to prevent damage to wires.

Question 10

Boxes for Conduit Wiring

Answer 10

Metal raceways may require 4-inch square boxes, with plaster covers to close gaps around boxes.

Question 11

Yoke

Answer 11

Yokes are metal or polycarbonate mounting straps. They attach devices to boxes with screws.

Question 12

Special-Purpose Outlets

Answer 12

.Special outlets are marked on plans, including unique circuits or receptacles like 240V or polarized types.

Question 13

Number of Conductors in a Box

Answer 13

NEC 314.16(A) specifies the maximum number of conductors in metal boxes. Volume allowance depends on wire sizes.

Question 14

Selecting the Correct Size Box (1 of 2)

Answer 14

Box size depends on the conductors and devices inside. Check NEC 314.16(A) for size requirements.

Question 15

Selecting the Correct Size Box (2 of 2)

Answer 15

Each metal box must have a grounding connection, such as a tapped hole for equipment grounding.

Question 16

Height of Receptacle Outlets

Answer 16

Electricians consult the plans and specifications for mounting heights.

Question 17

Positioning of Receptacles

Answer 17

NEC doesn’t specify receptacle positioning. Grounding slots should be at the top for safety.