ELEC 130 Lab - Micrometer & NEC Tables

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Electrical Engineering

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Jan 9, 2024

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San Joaquin Valley College ELEC 130 Micrometer & NEC Tables Lab Project: Micrometer Wire Identification Objectives: a) Identify conductor types and sizes and types of wire insulation using measuring devices and formulas. b) Use the National Electrical Code (NEC) to determine applications of use for various types of electrical conductors. c) Use the NEC to look up electrical terms and codes Materials: Assorted wire types and sizes Standard Micrometer caliper or digital caliper Reference: Class lecture notes, textbook, National Electric Code, Micrometer Procedure 1 : 1. Read and understand the proper use of the type of micrometer and/or digital caliper selected. 2. Obtain an assortment of 6 conductor types and sizes from your instructor. 3. Select one of the conductors of a solid wire type. 4. Using the micrometer and/or caliper, determine the conductor’s overall diameter in thousandths of an inch. 5. Convert the diameter in thousandths of an inch to mils by multiplying the diameter by 1,000. (Example: 0.677 x 1,000 = 677 mils). Record this value in Table 1, Dia. in Mils. 6. Using the formula given, determine the conductor’s area in circular mils, (CM). Record this value in Table 1, Area in Circular Mils. 7. Using Chapter 9, Table 8 “Conductor properties” of the NEC, (NEC 2020) determine the conductor’s size in AWG or Kcmil 8. Determine the conductor’s insulation type by reading the data on the conductor’s insulation jacket. Insulation types and abbreviations are listed in Table 310.4 of the NEC. Record the insulation code in Table 1, “Insulation Type”. 9. Using Table 310.16 of the NEC and the conductor’s insulation type, determine the conductor’s ampacity rating, and record this value in Table 1, “Conductor Ampacity”. 10. Repeat this procedure measuring all the conductors. Each time record the following in Table 1: a. b. Diameter in inches c. Area in Mils d. Area in CM e. AWG number f. Insulation type g. Ampacity as per the NEC. Stranded Conductors Lab - Micrometer & NEC Tables ELEC 130 Revised: 07.23 / pk Academic Affairs Department

San Joaquin Valley College ELEC 130 Micrometer & NEC Tables Lab 11. When testing stranded conductors, measure the diameter of one strand, convert to Mils, then to CM. Next multiply this CM number by the quantity of strands to determine the conductor’s total area in CM. If there is more than one size of strand, then you must repeat this process once for each size of strand, and then add these values together. Adding these CM values together must be done last. This will give you the total combined CM value. Enter this value in Table 1, “Area in Circular Mils”. NOTE: When working with stranded conductors with more than one size of strands, you should have two values in the “Diameter in Inches” column, and the “Diameter in Mils” column if Table 1. CONDUCTOR TESTED DIAMETER IN INCHES DIAMETER IN MILLS AREA IN CIRCULAR MILS AWG / KCMIL SIZE INSULATION TYPE CONDUCTOR AMPACITY 1. 2. 3. 4. 5. 6. Questions: Lab - Micrometer & NEC Tables ELEC 130 Revised: 07.23 / pk Academic Affairs Department Table 1

San Joaquin Valley College ELEC 130 Micrometer & NEC Tables Lab 1. Unless otherwise stated in the NEC, rules affecting conductors are based on which type of conductors? Lab - Micrometer & NEC Tables ELEC 130 Revised: 07.23 / pk Academic Affairs Department

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San Joaquin Valley College ELEC 130 Micrometer & NEC Tables Lab 2. Conductor sizes are expressed in circular mils. Smaller conductor sizes are sized in… …and larger conductor sizes are sized in… 3. The formula for converting the diameter of a conductor to CM is… 4. What determines if a conductor can be used for “wet locations”? 5. Unless elsewhere permitted in the code, what is the ampacity of the following conductors? Size Ampacity #14 THWN #12 THWN #10 THWN 6. Under what conditions can a higher than 75°C temperature rated conductor be terminated on a device or terminal and the higher temperature rating be utilized? 7. Why does Table 8 of the NEC only list sizes up to 4/0? Lab - Micrometer & NEC Tables ELEC 130 Revised: 07.23 / pk Academic Affairs Department

San Joaquin Valley College ELEC 130 Micrometer & NEC Tables Lab 8. Describe the purpose for utilizing Table 310.15(C)(1). 9. What is the definition of a “grounded conductor”? 10. Where in the NEC are requirements found for identifying grounded conductors? 11. What is meant by the term “ambient temperature”? Why is this important to know when determining a conductor’s ampacity? Lab - Micrometer & NEC Tables ELEC 130 Revised: 07.23 / pk Academic Affairs Department