Maricopa Community Colleges  ABC133   19952-19966 
Official Course Description: MCCCD Approval: 11/22/94
ABC133 19952-19966 L+L 1 Credit(s) 3 Period(s)
Contactors, Relays and Lighting
Types of contactors and relays and their practical applications. Principles of illumination and specific light sources. Includes practical applications for residential, commercial and industrial installations. Prerequisites: Indentured status with Associated Builders and Contractors, Inc., or permission of the apprenticeship coordinator.
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MCCCD Official Course Competencies:
 
ABC133   19952-19966 Contactors, Relays and Lighting
1. Describe the operating principles of contactors and relays. (I)
2. Explain how electromechanical contactors and relays, solid state relays and overload relays operate. (II, III)
3. Describe the National Electrical Code (NEC) requirements and install contactors and relays in a low voltage system. (IV)
4. Explain how light affects the vision mechanism of the human eye. (V)
5. Describe the operating characteristics and install incandescent, fluorescent and high-intensity discharge lamps. (VI)
6. Describe specific design features and install specific residential, commercial and industrial lighting systems. (VII)
7. Install specific lighting controls and demonstrate how each operates. (VIII)
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MCCCD Official Course Outline:
 
ABC133   19952-19966 Contactors, Relays and Lighting
    I. Contactors and Relays
        A. Definitions
        B. Operating principles
      II. Electromechanical (Magnetic) Contactors - Operation
          A. Lighting contactors
          B. Reversing motor starter
          C. Mechanically held contacts
        III. Relays - Operation
            A. Control
            B. Timers and timing
            C. Solid state D Overload
          IV. Installation of Contactors and Relays
              A. Protective enclosures
              B. Low-voltage remote-control switching
                1. Advantages
                2. System components
                3. Controls
                4. Operation
                5. Planning
                6. Design of low-voltage switching
                7. Installation procedures - NEC Art. 725
              C. Relay troubleshooting
            V. Light, Eye and Vision
                A. Seeing mechanism
                B. How human beings see
                C. Objective factors
                  1. Size
                  2. Luminance
                  3. Contrast
                  4. Time
              VI. Characteristics of Light
                  A. Light colors
                  B. Units of light measurement
                    1. Lumen
                    2. Foot-candles
                  C. Inverse square law for light
                  D. Light reflection
                  E. Field measurements
                  F. Light sources - lamps - operating characteristics
                    1. Incandescent
                    2. Tungsten-hologen
                    3. Electric discharge
                    4. Fluorescent
                  G. High-intensity discharge lamps
                    1. Mercury
                    2. Metal-halide
                    3. High-pressure sodium-vapor
                  H. Electroluminescent lamps
                VII. Lighting Design
                    A. Interior
                    B. Residential
                      1. Living room
                      2. Kitchen
                      3. Bathroom
                      4. Bedroom
                      5. Utility rooms
                      6. Basement
                    C. Commercial
                      1. Two-by-four troffers
                      2. Fluorescent fixtures
                      3. Incandescent lighting
                    D. Industrial lighting
                      1. Supplementary lighting
                      2. Explosive-proof equipment
                      3. Light distribution
                      4. Intermediate distribution ventilated reflector
                      5. Wide distribution ventilated reflector
                      6. Channel systems
                      7. Multi-tap ballasts
                  VIII. Lighting Controls - Operation
                      A. Switches
                        1. Three-way
                        2. Four-way
                        3. Photoelectric
                      B. Relays
                        1. Magnetic
                        2. Remote-control switches
                      C. Dimmers
                        1. Rheostat
                        2. Fluorescent lamps
                      D. Flashing lamps
                        1. Off-on flasher
                        2. Speller flasher
                        3. Flashing fluorescent
                      E. Stroboscopic Effect
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