Industrial Electrical Codes & StandardsSKET 141
Prerequisites: Prerequisites: SKET 136, SKET 138, and SKET 139, all with a minimum grade of "C".
Develops competency in the application of the National Electrical Code (NEC) and its relationship to industry and some residential wiring as written by the National Fire Protection Association (NFPA). Reviews the Joint Industrial Council (JIC) standards for industrial electrical mass production operations and equipment. Gives emphasis to the proper interpretation of safety issues regarding hazardous locations, electrical grounding, ground faults, fusing, motor circuit protection and controls, as well as electro-mechanical and hydraulic devices. Credit may be earned in SKET 141 or SKEL 141, but not both.(45-0)
Outcomes and Objectives
Demonstrate an understanding of the fundamentals of the National Electrical Code.
- Describe the purpose of the NEC and the reason for its existence.
- Describe how the NEC is arranged.
- Describe Authority Having Jurisdiction and its purpose.
Demonstrate familiarity with prints and be able to recognize electrical symbols, floor plans and plot plan symbols.
- Describe the purpose and what is included on a floor plan.
- Analyze a typical floor plan and list the electrical symbols.
- Describe when the specifications take precedence over a print.
Demonstrate an understanding of one-family dwellings and the calculations used to determine the load and NEC tables used in the calculation.
- Describe the various types of service entrance cable used.
- Describe the safety issues related to service drops.
- Name the NED article related to determining the maximum number of conductors in boxes.
- Describe the layout of receptacles in living area.
Demonstrate an understanding of commercial locations and the sizes of common electrical services.
- Recognize the article and section of the NEC having to do with main service, conductors, and wiring methods and materials used.
- Analyze the electrical plans to determine the kinds of circuits and equipment, and locations of main elements.
- Analyze the loads on the circuit for the various panels and service loads used.
- Describe the maximum setting of ground-fault protection of equipment for service equipment and the NEC article governing the ruling.
Determine the amperage of motors, size of wire and conduit, and overload protection needed in industrial locations, and the NEC articles related to industrial motors.
- Name the NEC article which explains when to use the tables and when to use the motor nameplate rating to determine the amps and ratings of the components of motor circuits.
- Describe how the ampacity is determined for conductors supplying two or more motors.
- Describe the tables used to determine the conductor ampacity, ampere rating of switches, short-circuit and ground-fault protection.
- Describe motor overload protection and the NEC article covering it.
Demonstrate methods of reducing hazards and determine classifications of hazardous locations under three NEC headings.
- Describe the class of hazardous location and the divisions under each class.
- Describe the NEC requirement for use of proper sealing compound in Class I locations.
- Describe the Class and Division of locations where concentrations of combustible dust of an electrically conductive nature may be present.
- Describe the NEC article regarding the marking of electrical equipment to be installed in hazardous locations to show the class, group and operating temperature.