MCCCD Program Description

Commercial Electrical Wiring and Codes

Course: ELC125

First Term: 2018 Fall

Lec + Lab 3.0 Credit(s) 3.0 Period(s) 3.0 Load
Subject Type: Occupational
Load Formula: T - Lab Load

Description: Commercial electrical power distribution techniques of low voltage (under 600 volt) systems. Selection of electrical distribution components, single and three systems, one-line diagrams and conductor selection. System grounding, planning and over current protection.

MCCCD Official Course Competencies
1. Identify specific project information from plans and specifications. (I) 2. Describe the application of one-line diagrams of power systems and identify symbols. (I) 3. Calculate load based on National Electrical and Local Electrical Codes for specific low voltage systems. (II) 4. Describe Voltage drop and derate of conductors. (II) 5. Demonstrate proper procedures for sizing conductors, boxes and wiring methods. (II, IV) 6. Select switches and receptacles for specific applications. (III) 7. Select the proper conduit and size for specific installations. (IV) 8. Set up a three-way switch and light. (III) 9. Wire a ground fault circuit interrupter (GFCI) & receptacle into a circuit. (III) 10. Assemble a single pole switch and split circuit. (IV) 11. List methods and calculate for over-current protection in branch circuits. (V) 12. Compare and contrast specific low voltage systems, including diagramming of special circuits. (VI) 13. Selection and describe installation of lighting fixtures for commercial occupancies. (VII, VIII) 14. Perform a GFCI circuit breaker installation. (VIII) 15. Describe electrical distribution system planning factors and procedures including application of ground fault requirements. (IX) 16. Calculate transformer applications. (IX) 17. List and size services for commercial applications. (IX) 18. Describe and determine grounding and bonding requirements. (IX) 19. Describe and compare emergency power systems. (X) 20. Describe operation of over-current devices. (XI) 21. Compare short circuit calculations and coordinate over-current protection. (XII) 22. Compare short circuit protection of specific equipment. (XIII)
MCCCD Official Course Competencies must be coordinated with the content outline so that each major point in the outline serves one or more competencies. MCCCD faculty retains authority in determining the pedagogical approach, methodology, content sequencing, and assessment metrics for student work. Please see individual course syllabi for additional information, including specific course requirements.

MCCCD Official Course Outline
I. Commercial Building Plans and Specifications A. Specific Information B. Symbols C. Calculate Plan Dimensions II. Branch Circuits and Feeders-Calculations A. Minimal Loading B. Minimum Number of Branch Circuits C. Current in 10/30 Circuits D. Size of Branch and Feeder Circuits E. Conductors F. Voltage Drop in 10 Circuits III. Switches and Receptacles A. Switches and Receptacles with the Proper Rating B. Types of Receptacles C. Single Pole, Three-way, Four-way and Double Pole Switches IV. Branch Circuit Installation A. Rigid/Electrical metallic tubing (EMT) Conduit Systems Installation B. Conduit Size/Calculation C. Box Sizes D. Support E. CU/AL (Copper/Aluminum) conductors V. Appliance and Office Circuits A. Appliance/Utilization Equipment Needs B. Branch Circuit Size, Over-current Protection for Applications C. Requirements D. Material Requirements VI. Special Systems/Circuits A. Surface Metal Raceways and Multi-outlet Assemblies B. Communication and Floor Outlet Assemblies C. Diagramming Photocell and Timer Controls D. Electric Boiler Controls E. Sump Pump Circuit VII. Lamps for Commercial Lighting A. Types B. Technical terms C. Parts and Operating Characteristics D. Installation VIII. Panel Board Selection and Installation A. Selection of Panel Boards Re: Required Branch Circuits B. Connection of Branch Circuits C. Feeder Size Selection IX. Selection of Service Equipment- Planning factors A. Installation of Transformer B. Basic Transformers Connection/applications C. Service Types D. Metering Equipment E. Ground fault requirements F. Commercial applications G. Grounding and bonding X. Emergency Power System A. Selection and Sizing B. Installation System XI. Over-Current Protection and Operation A. Class and types of Fuses B. Operation of Fuses and Circuit Breakers C. Understanding of Switch Sizes and Ratios D. Definitions E. Selection and Installation of Over-current Protective Devices F. Fuse Shorts XII. Short Circuit Calculations and Co-ordination of Over-current Devices A. Short Circuit Calculations B. Definitions C. Time/Current Curves XIII. Equipment and Conductor Short Circuit Protection A. Equipment/Conductor Withstand Rating B. Definitions C. Calculations D. Charts E. Understanding Thermal and Magnetic Forces F. Top Rules

MCCCD Governing Board Approval Date: June 27, 2017

All information published is subject to change without notice. Every effort has been made to ensure the accuracy of information presented, but based on the dynamic nature of the curricular process, course and program information is subject to change in order to reflect the most current information available.