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Temporary wiring

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Toolbox Talk: Temporary Wiring Safety

Date: [DATE] Duration: [DURATION] minutes Presenter: [PRESENTER NAME] Location: [LOCATION]

Objective

The objective of this toolbox talk is to provide workers with the knowledge and safe work practices necessary to safely install, use, and maintain temporary wiring systems on the job site, reducing the risk of electrical hazards and ensuring compliance with safety regulations.

Introduction

Temporary wiring is often used during construction, remodeling, maintenance, and repair activities. It is crucial to understand the specific safety requirements for temporary wiring to prevent electrical shocks, fires, and other hazards. Temporary wiring should be installed and maintained by qualified personnel only. [1]

Presenter Note: Engage the audience by asking if anyone has personal experience related to the topic.

Key Points

  • Temporary wiring is permitted for specific uses and durations [1]
  • Proper grounding and GFCI protection are essential [2]
  • Conductors must be protected from damage and properly supported [3]
  • Only approved wiring methods and equipment can be used [4]
  • Regular inspections and maintenance are necessary [2]

Hazard Identification

  • Electric Shock: Contact with live temporary wiring can cause severe electric shock or electrocution. Ensure all circuits are properly de-energized before working on them.
  • Fire Hazards: Overloaded or damaged temporary wiring can overheat and cause fires. Use the correct wire gauge for the intended load and inspect for damage regularly.
  • Tripping Hazards: Improperly placed or unsecured temporary wiring can create tripping hazards. Keep wiring out of walkways or protect it with covers.

Presenter Note: Encourage participants to share any additional hazards they've encountered.

Control Measures

  • Elimination: Use permanent wiring whenever possible to eliminate the need for temporary wiring.
  • Engineering Controls: Use Ground Fault Circuit Interrupters (GFCIs) on all 125-volt, single-phase, 15-, 20-, and 30-ampere receptacle outlets not part of the permanent wiring [2]. Ensure proper overcurrent protection with fuses and circuit breakers [3].
  • Administrative Controls: Develop and implement a written assured equipment grounding conductor program, including regular inspections and testing [2]. Provide training to all employees on the proper use and hazards of temporary wiring.
  • Personal Protective Equipment (PPE): Wear appropriate PPE, such as insulated gloves and safety footwear, when working with temporary wiring.

Safe Work Procedures

  1. Inspect temporary wiring before each use for any damage, such as frayed cords or loose connections.
  2. Ensure all temporary wiring is properly grounded and protected by GFCIs.
  3. Use only approved cords and connectors that are suitable for the environment (e.g., wet locations).
  4. Never overload temporary circuits or extension cords.
  5. Keep temporary wiring away from walkways and other areas where it could be damaged or create a tripping hazard.

Presenter Note: If possible, demonstrate the safe work procedure or use visual aids.

Personal Protective Equipment (PPE) Requirements

  • Insulated Gloves: Wear insulated gloves when handling electrical wiring to protect against electric shock.
  • Safety Footwear: Wear safety footwear with electrical hazard protection to insulate you from the ground.
  • Eye Protection: Wear safety glasses or face shields when working with wiring to protect against arc flashes and debris.

[Emphasize the importance of proper PPE use and maintenance]

Real-World Example or Case Study

[Provide a detailed description of a relevant real-world scenario or case study]

[Discuss what went wrong or right, and the lessons learned]

Presenter Note: Ask participants if they can relate this example to their own experiences.

Group Discussion

Discuss the following questions:

  1. What are the most common temporary wiring hazards you have observed on the job site?
  2. What steps can we take to improve our temporary wiring safety practices?
  3. How can we ensure that all temporary wiring is properly inspected and maintained?

Presenter Note: Encourage active participation and facilitate the discussion.

Emergency Procedures

  1. In case of electric shock, immediately disconnect the power source if safe to do so.
  2. Call for medical assistance and administer first aid.
  3. Report all electrical incidents to your supervisor immediately.
  4. Investigate the cause of the incident and take corrective actions to prevent recurrence.

Questions and Answers

[Encourage participants to ask questions]

[Provide answers to common questions related to the topic]

  • Q: How long can temporary wiring be used?

A: Temporary wiring should be removed immediately upon completion of the project or purpose for which it was installed [1].

  • Q: What type of cords should be used for temporary wiring?

A: Use flexible cords and cables approved for the conditions of use and location [5].

  • Q: What should I do if I find damaged temporary wiring?

A: Report it to your supervisor immediately and do not use the wiring until it is repaired or replaced.

Summary

  • Temporary wiring is a necessity on many job sites, but it must be handled with care.
  • Always inspect temporary wiring before use and report any damage.
  • Ensure proper grounding and GFCI protection are in place.
  • Follow safe work procedures and use appropriate PPE.

Action Items

  1. Inspect all temporary wiring in your work area and report any issues.
  2. Review the assured equipment grounding conductor program.
  3. Participate in a hands-on training session on temporary wiring safety.

Remember: Safety First! Always prioritize electrical safety when working with temporary wiring.

Report all hazards, near-misses, and incidents to your supervisor immediately.

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5 source record(s)

Sources used for this answer

[1] Rules for the Administration of the Oregon Safe Employment Act (Construction, Division 3, OSHA Oregon)

Page 467

Open source document

Source excerpt

## WIRING METHODS, COMPONENTS, & EQUIPMENT FOR GENERAL USE - (C) Receptacles shall be of the grounding type. Unless installed in a complete metallic raceway, each branch circuit shall contain a separate equipment grounding conductor, and all receptacles shall be electrically connected to the grounding conductor. Receptacles for uses other than temporary lighting shall not be installed on branch circuits which supply temporary lighting. Receptacles shall not be connected to the same ungrounded conductor of multiwire circuits which supply temporary lighting. - (D) Disconnecting switches or plug connectors shall be installed to permit the disconnection of all ungrounded conductors of each temporary circuit. - (E) All lamps for general illumination shall be protected from accidental contact or breakage. Metal-case sockets shall be grounded. - (F) Temporary lights shall not be suspended by their electric cords unless cords and lights are designed for this means of suspension. - (G) Portable electric lighting used in wet and/or other conductive locations, as for example, drums, tanks, and vessels, shall be operated at 12 volts or less. However, 120-volt lights may be used if protected by a ground-fault circuit interrupter. - (H) A box shall be used wherever a change is made to a raceway system or a cable system which is metal clad or metal sheathed. - (I) Flexible cords and cables shall be protected from damage. Sharp corners and projections shall be avoided. Flexible cords and cables may pass through doorways or other pinch points, if protection is provided to avoid damage. - (J) Extension cord sets used with portable electric tools and appliances shall be of three-wire type and shall be designed for hard or extra-hard usage. Flexible cords used with temporary and portable lights shall be designed for hard or extrahard usage. - Note: The National Electrical Code, ANSI/NFPA 70, in Article 400, Table 400-4, lists various types of flexible cords, some of which …

[2] Safety Standards for General Safety and Health Standards (Chaper 296-24 WAC)

Page 431

Open source document

Source excerpt

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ from the ground-fault circuit-interrupter-type receptacle to any outlet supplied from the ground-fault circuit-interrupter receptacle; or - (III) A nongrounding-type receptacle may be replaced with a groundingtype receptacle where supplied through a ground-fault circuitinterrupter; you must mark the replacement receptacle 'GFCI Protected' and 'No Equipment Ground;' an equipment grounding conductor may not be connected to such grounding-type receptacles. - (v) Receptacles connected to circuits having different voltages, frequencies, or types of current (AC or DC) on the same premises must be of such design that the attachment plugs used on these circuits are not interchangeable. ## (c) Ground-fault circuit interrupter protection for personnel . - (i) All 125-volt, single-phase, 15- and 20-ampere receptacles installed in bathrooms or on rooftops must have ground-fault circuit-interrupter protection for personnel. - (ii) The following requirements apply to temporary wiring installations that are used during construction-like activities, including certain maintenance, remodeling, or repair activities, involving buildings, structures or equipment. - (A) All 125-volt, single-phase, 15-, 20-, and 30-ampere receptacle outlets that are not part of the permanent wiring of the building or structure and that are in use by personnel shall have ground-fault circuit-interrupter protection for personnel. Note 1: Note 2: A cord connector on an extension cord set is considered to be a receptacle outlet if the cord set is used for temporary electric power. Cord sets and devices incorporating the required ground-fault circuit-interrupter that are connected to the receptacle closest to the source of power are acceptable forms of protection. - (B) Receptacles other than 1…

[3] Safety Standards for General Safety and Health Standards (Chaper 296-24 WAC)

Page 449

Open source document

Source excerpt

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ - (c) Distinguishable . Insulated conductors must be distinguishable by appropriate color or other suitable means as being grounded conductors, ungrounded conductors, or equipment grounding conductors. ## (7) Flexible cords and cables . - (a) Use of flexible cords and cables . - (i) Flexible cords and cables must be approved for conditions of use and location. - (ii) Flexible cords and cables may be used only for: - (A) Pendants; - (B) Wiring of fixtures; - (C) Connection of portable lamps or appliances; - (D) Portable and mobile signs; - (E) Elevator cables; - (F) Wiring of cranes and hoists; - (G) Connection of stationary equipment to facilitate their frequent interchange; - (H) Prevention of the transmission of noise or vibration; - (I) Appliances where the fastening means and mechanical connections are designed to permit removal for maintenance and repair; - (J) Data processing cables approved as a part of the data processing system; - (K) Connection of moving parts; and - (L) Temporary wiring as permitted in subsection (1)(b) of this section. - (iii) If used as permitted in (a)(ii)(C), (G), or (I) of this subsection, the flexible cord must be equipped with an attachment plug and must be energized from an approved receptacle outlet. - (iv) Unless specifically permitted otherwise in (a)(ii) of this subsection, flexible cords and cables may not be used: - (A) As a substitute for the fixed wiring of a structure; - (B) Where run through holes in walls, ceilings, or floors; - (C) Where run through doorways, windows, or similar openings; - (D) Where attached to building surfaces; - (E) Where concealed behind building walls, ceilings, or floors; or - (F) Where installed in raceways, except as otherwise permitted in this part. - (v) Flexible cords used in sho…

[4] Safety Standards for General Safety and Health Standards (Chaper 296-24 WAC)

Page 444

Open source document

Source excerpt

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ - (B) For a period not to exceed ninety days for Christmas decorative lighting, carnivals, and similar purposes; or - (C) For experimental or development work, and during emergencies. - (ii) You must remove temporary wiring immediately upon completion of the project or purpose for which the wiring was installed. - (iii) Temporary electrical installations of more than 600 volts may be used only during periods of tests, experiments, emergencies, or construction-like activities. - (iv) The following requirements apply to feeders: - (A) Feeders must originate in an approved distribution center. - (B) Conductors must be run as multiconductor cord or cable assemblies. However, if installed as permitted in (b)(i)(C) of this subsection, and if accessible only to qualified persons, feeders may be run as single insulated conductors. - (v) The following requirements apply to branch circuits: - (A) Branch circuits must originate in an approved power outlet or panelboard. - (B) Conductors must be multiconductor cord or cable assemblies or open conductors. If run as open conductors, they must be fastened at ceiling height every 10 feet. - (C) No branch-circuit conductor may be laid on the floor. - (D) Each branch circuit that supplies receptacles or fixed equipment must contain a separate equipment grounding conductor if run as open conductors. - (vi) Receptacles must be of the grounding type. Unless installed in a continuous grounded metallic raceway or metallic covered cable, each branch circuit must contain a separate equipment grounding conductor and all receptacles must be electrically connected to the grounding conductor. - (vii) No bare conductors nor earth returns may be used for the wiring of any temporary circuit. - (viii) You must install suitable disconnect…

[5] Rules for the Administration of the Oregon Safe Employment Act (Construction, Division 3, OSHA Oregon)

Page 466

Open source document

Source excerpt

Oregon Administrative Rules Oregon Occupational Safety and Health Division ## WIRING METHODS, COMPONENTS, & EQUIPMENT FOR GENERAL USE ## §1926.405 Wiring Methods, Components, and Equipment for General Use. - (a) Wiring methods. The provisions of this paragraph do not apply to conductors which form an integral part of equipment such as motors, controllers, motor control centers and like equipment. ## (1) General requirements. - (i) Electrical continuity of metal raceways and enclosures. Metal raceways, cable armor, and other metal enclosures for conductors shall be metallically joined together into a continuous electric conductor and shall be so connected to all boxes, fittings, and cabinets as to provide effective electrical continuity. - (ii) Wiring in ducts. No wiring systems of any type shall be installed in ducts used to transport dust, loose stock or flammable vapors. No wiring system of any type shall be installed in any duct used for vapor removal or in any shaft containing only such ducts. ## (2) Temporary wiring. - (i) Scope. The provisions of paragraph (a)(2) of this section apply to temporary electrical power and lighting wiring methods which may be of a class less than would be required for a permanent installation. Except as specifically modified in paragraph (a)(2) of this section, all other requirements of this subpart for permanent wiring shall apply to temporary wiring installations. Temporary wiring shall be removed immediately upon completion of construction or the purpose for which the wiring was installed. ## (ii) General requirements for temporary wiring. - (A) Feeders shall originate in a distribution center. The conductors shall be run as multiconductor cord or cable assemblies or within raceways; or, where not subject to physical damage, they may be run as open conductors on insulators not more than 10 feet (3.05 m) apart. - (B) Branch circuits shall originate in a power outlet or panelboard. Conductors shall be run as mu…

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