Temporary electrical power and lighting installations on construction sites require strict adherence to safety guidelines to prevent electrical hazards and ensure regulatory compliance. Here are key safety measures:

• Compliance with Electrical Codes: All temporary wiring must comply with the Electrical Inspection Act and its regulations. [3]

• Grounding: Ensure that all metal parts of electrical equipment are effectively grounded, including cable armor, metal conduits, and metallic safeguards. Grounding conductors should have low resistance and sufficient capacity to handle potential fault currents and be mechanically protected where damage is likely. [1] [1] [1]

• Portable Electrical Conductors: Use fixed outlets safely accessible for portable electric conductors. [1]

• Conductor Types: Use rubber-covered cords for portable electrical tools and extension lamps that may be subject to hard usage; single-strand wire is prohibited for temporary wiring. [1]

• Accidental Contact Prevention: Prevent accidental contact with electrical circuits or current-carrying parts operating at 50V AC or more by enclosing them or installing them in restricted access areas. [1]

• Ladder Safety: Metal ladders or ladders with conductive material should not be used near energized conductors or equipment. [3]

• Insulated Tools: Use adequately insulated and approved hand tools for electrical work, such as pliers and screwdrivers. [3]

• Lighting: Ensure sufficient artificial illumination is provided when natural light is inadequate. [2]

• Safe Handling of Equipment: Handle portable equipment in a manner that prevents damage, and do not use flexible cords to raise or lower equipment or fasten them in ways that could damage the insulation. [5]

• Regular Inspections: Visually inspect portable cord and plug-connected equipment and extension cords before each shift for defects or damage. Remove any defective items from service until they are repaired and tested. [5] [5]

• Grounding Conductors: Flexible cords used with grounding-type equipment must contain an equipment-grounding conductor, and attachment plugs and receptacles should maintain proper grounding continuity. [5] [5]

• Water Safety: Use equipment approved for wet locations in highly conductive work locations or where contact with water is likely. [5]

• Safe Connections: Ensure hands are dry when plugging and unplugging cords, and use insulated protective equipment when handling energized connections that could provide a conductive path to the hand. [5] [5]

• Circuit Management: Use load-rated switches or circuit breakers for opening or closing circuits under load conditions, and do not re-energize a circuit after a protective device has tripped until it is determined safe to do so. [5] [5]

• Overhead Lines: Maintain minimum approach distances from energized overhead power lines. [8]

• De-energizing and Lockout/Tagout: Before working on electrical equipment, ensure it is de-energized and grounded, with controls tagged and locked to prevent re-energization. [9]

• Working Space: Keep access to switches and meters clear of obstructions and ensure main service switches and temporary panel boards are securely mounted and readily accessible. [9] [7]

• Marking: Clearly mark all electrical distribution switches and controls to indicate the machinery or equipment they serve. [9]

• Nonconductive Ladders: Use portable ladders with nonconductive siderails where there is a possibility of contact with exposed energized parts. [6]

• Training: Employers must provide training in the precautions and safe practices described in the relevant standards and ensure that employees do not engage in activities until they have received proper training. [2]

• Working on Energized Equipment: A worker shall not work on an energized electrical conductor or equipment, unless procedures are used and the worker is provided with and trained in the use of special tools. [4]

• Code of Practice: Before commencing work on or near energized exposed parts of electrical equipment, an employer or a contractor shall inform the employees involved in the work of the content of the code of practice and the supervisor shall document the communication of the information. [7]

By following these guidelines, construction sites can maintain a safe environment during temporary electrical installations, reducing the risk of electrical accidents and ensuring compliance with safety regulations.