Table of Contents
How does the National Electrical Code handle units of measurement? Section 90.9 requires that SI units (metric units) appear first and that the inch-pound units shall immediately follow in parentheses.
Which units of measurement appear first throughout the NEC metric or US customary?
Both the metric and inch-pound measure- ment systems are shown in the NEC, with the metric units appearing first and the inch-pound system immediately following in parentheses. though the U.S. construction industry uses inch-pound units of measurement.
What is the primary unit of length?
The basic unit of length in the metric system is the meter. All units of length in the metric system are derived from the meter. The prefix “centi-“means one hundredth.
What is 1000 times the base unit?
Hecto- means 100 times the base unit. Kilo- means 1000 times the base unit.
How could someone prove he or she answered question 6 correctly quizlet?
How could someone prove he or she answered Question 6 correctly? The correct answer is: Substitute the calculated values into the original equation and verify equality.
What organization actually develops and publishes The National Electrical Code?
The NEC is developed by NFPA’s Committee on the National Electrical Code, which consists of twenty code-making panels and a technical correlating committee. Work on the NEC is sponsored by the National Fire Protection Association.
Which National Electrical Code is for special conditions?
2017 NEC: Special Conditions And Communication Systems—Significant Changes in the 2017 NEC, Part 10.
What are the 3 principles from which the metric system is based?
Metric system basics The three most common base units in the metric system are the meter, gram, and liter. The meter is a unit of length equal to 3.28 feet; the gram is a unit of mass equal to approximately 0.0022 pounds (about the mass of a paper clip); and the liter is a unit of volume equal to 1.05 quarts.
Which metric units are commonly used to measure length volume mass temperature and energy?
The five SI base units commonly used by chemists are the meter, the kilogram, the kelvin, the second, and the mole. What metric units are commonly used to measure length, volume, mass, temperature and energy? In SI, the basic unit of length is the meter (m).
What may be used in lieu of jack stands?
In a pinch, dense pieces of wood stacked lengthwise can be used to support weight in lieu of jack stands. Cinder blocks should NEVER be used, as they are not weight rated and could crumble without notice.
What unit is 10 times bigger than a gram?
A decigram is 10 times larger than a gram.
What are the 3 types of measurement?
The three standard systems of measurements are the International System of Units (SI) units, the British Imperial System, and the US Customary System. Of these, the International System of Units(SI) units are prominently used.
What unit is 100 times smaller than a gram?
Measuring Mass in the Metric System kilogram (kg) hectogram (hg) milligram (mg) 1,000 grams 100 grams 0.001 gram.
How many people died in the MGM Grand Hotel fire as a result of smoke inhalation?
Paradise, Nevada, U.S. The MGM Grand fire occurred on Friday, November 21, 1980 at the MGM Grand Hotel and Casino (now Bally’s Las Vegas), located on the Las Vegas Strip in Paradise, Nevada. The fire killed 85 people, most through smoke inhalation.
What is the most important consideration when planning a large wire pull?
What is the most important consideration when planning a large wire pull? The proper personal protective equipment (PPE) and safety requirements for the job.
How many people died in the MGM Grand fire as a result of smoke inhalation and carbon monoxide select one?
21, 1980, 87 people were killed and more than 700 were injured as a result of a fire at the MGM Grand Hotel — now Ballys — on the Las Vegas Strip, according to Clark County. The electrical fire started in a deli on the casino level. The fire and smoke spread upward through the hotel’s ventilation system.
What is the purpose of the National Electrical Code?
Adopted in all 50 states, NFPA 70, National Electrical Code (NEC) is the benchmark for safe electrical design, installation, and inspection to protect people and property from electrical hazards.
Why is it important to follow the National Electrical Code and local and state codes?
As the preeminent electrical code in the country, it establishes the basics of electrical safety. The significance of the code reaches a new level when adopted into law by local jurisdictions. Compliance with the code makes it easier to ensure that power installations are free of hazards.
Why does the electrical drawings must follow the standards and specifications in the electrical code?
Electrical designs must comply with the requirements of Code to ensure safety. Energy management, maintenance, and power quality issues aren’t within the scope of the Code.
How do you cite the National Electrical Code?
APA (6th ed.) Earley, M. W., Sargent, J. S., Coache, C. D., & Roux, R. J. (2011). National electrical code handbook. Quincy, Mass: National Fire Protection Association.
What is the difference between listed and labeled?
Article 100 of NFPA 70 defines listed and labeled—in short, components or products have to be approved by the authority having jurisdiction (AHJ), and labeled to indicate compliance. Both terms are used in the definition of listed, so theoretically, this allows the AHJ to vet certain products or manufacturers.
What is the primary purpose of a nationally recognized testing laboratory?
A Nationally Recognized Testing Laboratory (NRTL) is an independent third-part laboratory recognized by the United States Occupational Safety and Health Administration (OSHA) to test and certify products to applicable product safety standards.
How are metric units measured?
To tell whether the unit is measuring length, mass, or volume, you look at the base. Using this table as a reference, you can see the following: A kilogram is 1,000 times larger than one gram (so 1 kilogram = 1,000 grams). A centimeter is 100 times smaller than one meter (so 1 meter = 100 centimeters).
How do we convert units in the metric measurement system?
To convert from one unit to another within the metric system usually means moving a decimal point. If you can remember what the prefixes mean, you can convert within the metric system relatively easily by simply multiplying or dividing the number by the value of the prefix.
Do units measure?
SI Unit Prefixes Unit name Unit symbol Quantity name meter m length kilogram kg mass second s time ampere A electric current.
How are the metric units for length volume and mass related?
The base units of length and volume are linked in the metric system. By definition, a liter is equal to the volume of a cube exactly 10 cm tall, 10 cm long, and 10 cm wide.Unit Conversions. Length 1 m = 1.094 yd 1 yd = 0.9144 Volume 1 L = 1.057 qt 1 qt = 0.9464 Mass.
Which metric units are commonly used to measure mass?
In the metric system of measurement, the most common units of mass are the gram and kilogram.
