Review for Chapter 1
List at least five electrical safety rules that should be followed by refrigeration, heating, and air-conditioning technicians.
1. Follow the National Electrical Code as a standard when making electrical connections and calculating wire sizes and circuit protection. 2. Wear shoes with an insulating sloe and heel. 3. Do not use metal ladders when working near live electrical circuits. 4. Examine all extension cords and power tools before using. 5. replace or close all covers on receptiacals the house electrical wiring and controls. 6. Discharge all capacitors with a 20,000 OHM, 4-watt resistor before touching the terminals.
Which of the following voltages will a refrigeration, heating, and air-conditioning technician come in contact with in the industry?
24 volts 120 volts 240 Volts d. all of the above Correct
What is a live electrical circuit?
A circuit that is being supplied with electrical potential (voltage).
What is the difference between a fuse and a circuit breaker?
A fuse will have to be replaced when an overload occurs, while a circuit breaker will only have to be reset
What is the difference between a two-prong plug and a three-prong plug?
A three-prong plug has a ground, while a two-prong plug does not.
The correct fuse size for an electrical circuit is one that is sized twice as large as needed for circuit protection. T or F
False
What type of ladder should the technician use on the job?
Fiberglass (Both B and C) Check with Mr. Dien
An electrical device that will open an electrical circuit, preventing current flow to the circuit if a small leak to ground is detected, is called a _____.
GFCI
Which of the following is the standard by which electrical installations are measured in the United States?
National Electrical Code®
What precautions should be taken when you see a coworker receiving an electrical shock?
Never touch a person who is receiving an electrical shock.
Which of the following conditions is the most dangerous and likely to cause serious injury?
The technician touches a live conductor with his right hand and touches a ground with his left hand.
A current flow of 0.1 ampere or less could be fatal. T or F
True
A grounding adapter does no good if it is not connected to an electrical ground. T or F
True
A heating and air-conditioning service technician can usually troubleshoot heating and air-conditioning systems without the voltage being supplied to the equipment. T or F
True
It is recommended that at least one person on a truck know CPR. T or F
True
Receptacles used on the job site should be protected with a GFCI.True or False
True
Electrical shock occurs when a person _____?
becomes part of an electric circuit
What precautions should you use when working in an area with a large number of people and you must disconnect the power from an appliance you are working on?
lock out circuit being serviced
What are the important elements of electrical safety when working around live circuits?
respect electricity, do not be careless, make sure electrical power is disconnected from circuits that are being worked on if possible, learn the safety rules in section 1.7
Which prong on a three-prong plug is the ground?
the center semicircular prong
