Commercial Wiring Chp.1 Quiz

The open-circuit voltage between the two terminals of a single-pole switch on a lighting circuit when the switch is in the OFF position is

• a. zero

• b. 60 volts

• c. 120 volts

• d. 240 volts

An arc flash can produce temperatures of

• a. 3,500

• b. 15,000

• c. 25,000

• d. 35,000

For safety, it is very important that electrical equipment be “listed" by the

• a. NEC

• b. OSHA

• c. NRTL

• d. ANSI

Footwear suitable for electrical work is marked with the letters

• a. CF

• b. EH

• c. OSHA

• d. PPE

The National Electrical Code is revised every years so as to be as up to date as possible.

• a. two

• b. three

• c. four

• d. five

The term approved means to be

• a. listed by a Nationally Recognized Testing Laboratory (NRTL)

• b. acceptable to the National Electrical Code

• c. acceptable to the architect or engineer designing the job

• d. acceptable to the authority having jurisdiction

As defined in Article 100, a dwelling unit has the following feature(s):

• a. permanent provisions for living, sleeping, cooking, and sanitation

• b. living, sleeping, and basement or storage areas

• c. space for eating, sleeping, and recreation

• d. optional garage space

All measurements in the National Electrical Code are shown in which system(s) of units?

• a. inch-pound (English) only

• b. SI (metric) only

• c. both inch-pound and metric values

• d. both natural units and physical units

In the international system of units, the prefix kilo- means

• a. hundred

• b. thousand

• c. million

• d. billion

In the international system of units, the prefix milli- means

• a. one hundredth

• b. one thousandth

• c. one millionth

• d. one billionth