Electrical Distribution Structures

Course Description

ETP1140C — Electrical Distribution Structures is a 3-credit, lecture/laboratory course in the Engineering Technologies: Energy Power Technology taxonomy of the Florida Statewide Course Numbering System (SCNS). The course introduces students to the physical infrastructure of electric power distribution systems, from the distribution substation to the customer meter. Students study the types, materials, and standards governing overhead and underground distribution structures; gain hands-on experience with poles, crossarms, conductors, transformers, grounding systems, and associated hardware; and apply OSHA and NESC safety regulations throughout all work activities. The course prepares learners for entry-level employment as utility line workers, groundsmen, or apprentice linemen with investor-owned utilities, rural electric cooperatives, and municipal electric systems operating in Florida.

Learning Outcomes

Required Outcomes

Upon successful completion of this course, students will be able to:

• Describe the overall structure of the electric power system — generation, transmission, and distribution — and explain how a distribution system originates at a substation and delivers power to residential, commercial, and industrial customers.
• Identify and differentiate the major components of an overhead distribution structure, including wood poles, crossarms, insulators, conductors, guy wires, and associated hardware, and explain the function of each.
• Identify and differentiate the major components of an underground residential distribution (URD) system, including conduit, direct-buried cable, pad-mounted transformers, and switching equipment.
• Apply OSHA 29 CFR 1910.269 and 29 CFR 1926 Subpart V regulations governing electric power generation, transmission, and distribution work, including minimum approach distances and Personal Protective Equipment (PPE) requirements.
• Demonstrate safe procedures for establishing an Equipotential Protective Zone (EPZ) and installing protective grounds and bonds at the worksite to protect crew members from hazardous differences in electric potential.
• Explain the operating principles, construction, and connection types (single-phase, three-phase, Wye, and Delta) of overhead and pad-mounted distribution transformers.
• Interpret distribution system engineering drawings, staking sheets, work orders, and utility construction standards used in Florida electric utility operations.
• Apply safe pole-climbing techniques using climbing gaffs, body belts, and fall-protection equipment; perform pole-top work tasks including setting crossarms and installing hardware.
• Conduct a job hazard analysis (JHA) and deliver an effective pre-job safety brief covering hazard identification, mitigation, and crew roles and responsibilities.
• Explain the roles of investor-owned utilities, rural electric cooperatives, and municipal utilities in Florida's electric distribution sector, including applicable Florida Public Service Commission regulations.

Optional Outcomes

The following outcomes may be addressed depending on available facilities and instructor emphasis:

• Operate aerial lift equipment (bucket trucks) safely and perform qualified rescue procedures including bucket rescue and pole-top rescue.
• Perform Lockout/Tagout (LOTO) procedures on distribution circuits and explain the requirements of OSHA 1910.147 and 1910.269.
• Demonstrate traffic control and flagger certification procedures (ATSSA) for roadway worksite safety.
• Use digital utility mapping tools and GIS-based work order systems to locate and document distribution infrastructure.
• Explain how smart grid technologies — including automated switching, advanced metering infrastructure (AMI), and distribution automation — are being integrated into Florida utility systems.

Major Topics

Required Topics

1. Introduction to the Electric Power System
   • Overview of generation, transmission, and distribution
   • Types of electric utilities in Florida: investor-owned, cooperative, and municipal
   • Distribution system voltages (120 V to 34 kV) and service classifications
   • Florida Public Service Commission oversight and utility standards
2. Distribution System Components and Structures
   • Wood pole types, classes, species, and ANSI/NESC standards
   • Crossarms, insulators, pin-type and suspension hardware
   • Conductors: ACSR, AAC, bare, and covered; conductor stringing and sagging
   • Guy wire assemblies, anchors, and down guys
   • Service drops and metering equipment
3. Overhead Line Construction Practices
   • Pole setting: hand digging, power auger, and setting equipment
   • Loading and erecting poles and crossarms
   • Installing insulators, cutouts, lightning arresters, and capacitors
   • Framing poles to utility construction standards
4. Underground Distribution (URD) Systems
   • URD system components: cable types, conduit, trenching, and direct burial
   • Pad-mounted transformers and switching cabinets
   • Cable splicing, terminations, and elbows
   • Locating underground utilities (811 / Sunshine State One-Call)
5. Distribution Transformers
   • Transformer construction, ratings, and nameplate data
   • Single-phase and three-phase connections: Wye and Delta configurations
   • Pad-mounted vs. overhead pole-mount transformers
   • Transformer protection: fusing, lightning arresters, and overvoltage devices
   • Grounding of transformer secondary neutrals
6. Grounding and Bonding
   • System grounding vs. equipment grounding
   • Equipotential Protective Zone (EPZ) installation and theory
   • Protective grounds: sizing, installation, and removal sequence
   • Step potential and touch potential hazards
   • OSHA 1910.269 grounding requirements
7. Safety Regulations and Work Practices
   • OSHA 29 CFR 1910.269 — Electric Power Generation, Transmission, and Distribution
   • OSHA 29 CFR 1926 Subpart V — Power Transmission and Distribution (Construction)
   • National Electrical Safety Code (NESC) clearances and construction grades
   • Personal Protective Equipment (PPE): rubber gloves, sleeves, hard hat, arc-flash protection
   • Minimum approach distances for qualified and unqualified persons
   • Job Hazard Analysis (JHA) and pre-job safety brief
8. Pole Climbing Skills
   • Climbing equipment inspection: gaffs, climbers, body belts, lanyards
   • Safe climbing techniques and fall-restraint use
   • Pole inspection for soundness prior to climbing
   • Working at height: tool control and positioning
9. Tools, Equipment, and Field Operations
   • Hand tools and specialized lineman tools (hotsticks, strap wrenches, come-alongs)
   • Chain saws, power augers, and digger-derrick trucks
   • Rigging: knots, blocks, rope splices, and slings
   • Reading and interpreting staking sheets and work orders

Optional Topics

• Bucket truck operation and bucket/pole-top rescue techniques
• Lockout/Tagout (LOTO) procedures on distribution circuits
• Troubleshooting distribution outages: backfeed, induced voltage, and voltage complaints
• Traffic control and ATSSA flagger certification procedures
• Introduction to substations: components, function, and safe movement within the substation
• Smart grid and distribution automation concepts (AMI, SCADA, automated switching)
• Drone and remote sensing technology for distribution system inspection

Resources & Tools

• Textbook: The Lineman's and Cableman's Handbook (Shoemaker & Mack, McGraw-Hill) — the primary industry reference
• Standards: ANSI C2 National Electrical Safety Code (NESC); OSHA 29 CFR 1910.269; OSHA 29 CFR 1926 Subpart V
• Lab/Field Equipment: Wood distribution poles and crossarm assemblies; climbing gaffs, body belts, and fall-protection harnesses; rubber insulating gloves and sleeves; hotsticks and live-line tools; transformer connection kits; portable protective grounds and EPZ sets
• Industry References: Florida Public Service Commission rules (Florida Administrative Code Chapter 25-6); local utility construction standards (e.g., FPL, Duke Energy Florida, SECO Energy)
• Software / Digital Tools: GIS-based utility mapping platforms; utility staking and work-order management software
• Certifications Supported: OSHA 10-Hour ET&D card; American Red Cross CPR/First Aid; Sunshine State One-Call (811) awareness

Career Pathways

Completion of ETP1140C supports entry into skilled trades and technical careers in Florida's electric utility and energy infrastructure sectors, including:

• Apprentice Lineworker / Groundsman — investor-owned utilities (FPL, Duke Energy Florida, Tampa Electric), rural electric cooperatives (SECO, Clay Electric), and municipal electric systems
• Utility Line Construction Technician — electrical contractors and subcontractors specializing in T&D infrastructure
• Distribution Operations Technician — utility operations centers and field crew positions
• Electrical Substation Technician (with additional coursework)
• Journeyman Lineworker — after completing a IBEW or NRECA-affiliated apprenticeship program (typically 4–5 years)

This course is commonly part of a Certificate or Associate in Science (A.S.) degree pathway in Energy Power Technology, and credits are designed to articulate into IBEW Local Union apprenticeship programs and NCCER electrical lineworker certifications.

Special Information

Certification Preparation

• OSHA 10-Hour Electrical Transmission & Distribution (ET&D) — course content aligns with OSHA 1910.269 and 1926 Subpart V competencies required for the ET&D 10-hour card.
• NCCER Electrical Lineworker Level 1 — course topics correspond to NCCER Core and Electrical Lineworker Level 1 task modules including safety, tools, climbing, and distribution structures.
• CPR / First Aid — First Responder and CPR/AED certification is typically completed as part of the laboratory safety component.
• Sunshine State One-Call (811) Underground Utility Locating Awareness — required field safety competency for all Florida utility workers.

Physical Requirements

Due to the hands-on nature of this course, students must be capable of working at heights on utility poles, lifting materials up to 50 lbs., and performing tasks in outdoor environments and varying weather conditions. Students should consult the program advisor regarding any physical limitations prior to enrollment.