Electricity Inspection Section#3 The Distribution System Quiz#1

You should have finished Section 2 (The Service Box, Grounding & Panels) before starting this Section. This Study Session outlines the scope of electrical inspection as set out in the ASHI® Standards. This session also includes an introduction to the inspection of the branch circuits and a description of branch circuit wiring.

The estimated completion time is 45 minutes.

Objectives
At the end of this study session, you should be able to:

• List what is included in an electrical inspection for branch circuit wiring according to our professional standards.
• Describe the function of distribution wiring.
• List the different types of cable found.
• Explain the difference between insulation and sheathing.
• Explain the difference between solid versus stranded wires.
• Explain what is mean by dedicated circuits.
• Explain what is meant by overloaded circuits.
• Describe how wires should be connected.
• Describe how wires should be supported.
• Identify appropriate locations for wiring

• Question 1

  Needs Grading

  	Along length of a vertical wire, how far apart should the supports be?
  	Selected Answer: Stable every 5 feet in Canada Correct Answer:   Four and a half to five feet.

• Question 2

  Needs Grading

  	Describe 3 different cable types you might see.
  	Selected Answer: NMD Non-Metallic sheathed cable suitable for a Dry environment NMW Non-Metallic sheathed cable suitable for Wet environment NMWU Non-Metallic sheathed cable suitable for Wet Underground environment Correct Answer:   1. NMD, Romex, Loomex 2. NMW 3. BX (AC-90), armored cable 4. Knob-and-tube

• Question 3

  Needs Grading

  	Give 5 examples of poor locations for wiring.
  	Selected Answer: 1. Exposed to damage 2. Under carpets 3. Close to the edge of studs or joists 4. In ductwork 5. Against pipes, ductwork, exhaust flues, vents, chimneys or anything else that might be hot.  Correct Answer:   1. Exposed to damage, on wall surfaces for example 2. Under carpets 3. Close to the edge of studs or joists 4. In ductwork 5. Against pipes, ducts, exhaust flues vents, chimneys or other heat sources

• Question 4

  Needs Grading

  	How are extension cords different from permanent wiring?
  	Selected Answer: Extension cords's sheathing is not designed to be stapled into place and the wire gauge is smaller than conventional household wiring. Extension cords are usually 16 or 18 gauge.  Correct Answer:   Extension cords are flexible and stranded. They have lighter sheathing that is not intended to be stapled or secured in place permanently. The gauge of extension cords is typically 16 or 18 gauge, smaller than permanent wiring.

• Question 5

  Needs Grading

  	List 4 different branch wire materials you might see.
  	Selected Answer: 1. Copper 2. Aluminum 3. copper-clad aluminum 4. solder-dipped copper wire Correct Answer:   1. Copper 2. Aluminum 3. Copper clad aluminum 4. Solder-dipped copper

• Question 6

  Needs Grading

  	What are the issues about running wire through steel studs?
  	Selected Answer: 1. Wires may be damaged 2. Wires may touch metal materials Correct Answer:   Wire may be damaged by sharp edges of steel studs. Wires passing through holes should be protected with grommets for example. Wires running parallel to studs should stand off the studs.

• Question 7

  Needs Grading

  	What is an overloaded circuit?
  	Selected Answer: A circuit that carries too many outlets or appliances.  Correct Answer:   An overloaded circuit has a large number of outlets, switches or appliances. Under normal circumstances, the current may exceed the circuit ampacity and rating of the fuse or breaker.

• Question 8

  Needs Grading

  	What is the difference between insulation and sheathing?
  	Selected Answer: Insulation is the material that wrapped around wires. They are plastic. Sheathing wraps around the insulated wires and uninsulated ground wires. You can see sheathing but not insulation Correct Answer:   Insulation is around the individual wires, and sheathing forms the cables by wrapping around the insulated wires.

• Question 9

  Needs Grading

  	When a wire leaves a box, how far should it run before it is supported or secured?
  	Selected Answer: 12 inches Correct Answer:   Twelve inches.

• Question 10

  0 out of 0 points

  	The most common wire size for branch household circuits is _____ gauge. (Enter a number)
  	Selected Answer:  14 Correct Answer: Evaluation Method Correct Answer Case Sensitivity Exact Match 14

• Question 11

  0 out of 0 points

  	Which of the following do we have to inspect? (Choose 2)
  	smoke detectors   operation of all GFI's Correct Answers:   polarity of all receptacles   operation of all GFI's

• Question 12

  0 out of 0 points

  	Which of the following wires are stranded? (Choose 2)
  	#8   #6 Correct Answers:   #8   #6