4: Electrical Hazards in Construction
- Page ID
- 63102
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\(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)- 4.1: Definition
- This page discusses electrical hazards in the workplace, highlighting the risks of burns, electrocution, shock, and arc flash. It notes that electrocution is particularly deadly and often results from contact with power lines or faulty equipment, with construction incidents being a major concern.
- 4.2: The Basics of Electricity
- This page covers the basics of electricity, likening a switch's function to a water faucet, and detailing electron flow through conductors as electric current. It discusses electricity generation, transmission, and distribution, clarifying voltage, types of current (AC and DC), and resistance.
- 4.3: How Electrical Shocks Occur
- This page discusses the risks of electricity in closed circuits, highlighting shock hazards from energized wires and ground. The severity of shocks relates to current, body path, and exposure duration, referred to as the electrocution triangle. It emphasizes the dangers of overhead and buried power lines, including electrocution and falls, illustrated with examples of improper equipment handling.
- 4.4: Preventive Measures for Workers to Consider
- This page emphasizes vital safety measures for working near power lines and with electrical equipment. It highlights maintaining safe distances, de-energizing lines, using nonconductive tools, and marking clearances. The importance of Ground Fault Circuit Interrupters (GFCIs) in preventing electrical shocks is underscored, along with the need to inspect extension cords for damage. Overall, proper handling and awareness are critical to ensuring worker safety.
- 4.5: Tool safety tips
- This page emphasizes the importance of safe power tool use by following guidelines to prevent misuse and electrical hazards. Key practices include proper handling, avoiding wet conditions, maintaining well-lit workspaces, and discarding damaged tools.
- 4.6: Safeguards
- This page highlights safety measures for overhead power lines and electrical parts, emphasizing deactivation, grounding, and PPE for workers. It details Lockout/Tagout procedures for maintenance and discusses OSHA regulations for GFCIs and equipment grounding programs. It also covers power tool maintenance, effective guarding, training, and proper use of flexible cords to enhance workplace safety.
- 4.7: Factors on Extension Cord Safety
- This page covers extension cord safety on construction sites, focusing on hazards from improper use and maintenance. It stresses the need for strain relief at connections, avoiding environmental damage, and not compromising safety ratings during repairs. The page highlights the importance of durable, rated cords, maintaining grounding for shock prevention, and keeping connectors dry, recommending watertight connectors in wet conditions to reduce risks.
- 4.8: Electrical Safety Tips
- This page outlines essential electrical safety protocols, stressing the necessity of using undamaged tools, avoiding overhead wires, and reporting downed lines. It advises maintaining safe distances from electrical sources, inspecting equipment in damp conditions, and employing ground-fault circuit interrupters. Repairs should be conducted by qualified personnel, while makeshift repairs are discouraged.
- 4.9: Review Questions
- This page discusses essential safety measures to prevent electrocution and manage electrical hazards. It highlights protective practices like keeping distance from power lines, utilizing GFCIs, and following lockout/tagout procedures. The content also covers electric burn types, ladder safety near power lines, and tool inspection.