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what sop is needed to do low voltage work

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Standard Operating Procedure: Low Voltage Electrical Work =========================================================

This document outlines the standard operating procedure (SOP) for performing low voltage electrical work safely and in compliance with relevant safety regulations. It is intended to provide clear guidance to qualified personnel to minimize the risk of electrical shock, burns, and other injuries. Low voltage is defined as a potential difference (voltage) from 31 to 750 volts inclusive, between conductors or between a conductor and ground. Adherence to this SOP is mandatory for all employees and contractors performing low voltage electrical work.

1\. Planning and Preparation

1\.1\. Hazard Assessment

Before commencing any low voltage electrical work, a thorough hazard assessment must be conducted. This assessment should identify potential hazards such as:

  • Exposed energized parts
  • Damaged or faulty equipment
  • Wet or damp locations
  • Confined spaces
  • Inadequate lighting
  • Presence of flammable materials

1\.2\. Safe Work Procedures

Develop and document appropriate written safe work procedures that address the identified hazards. These procedures must include:

  • Step-by-step instructions for the specific task
  • Required personal protective equipment (PPE)
  • Specific tools and equipment needed
  • Emergency procedures
  • Lockout/Tagout procedures

1\.3\. Qualified Personnel

Ensure that only qualified persons are authorized to perform low voltage electrical work. A qualified person is someone who has the necessary skills, knowledge, and experience to safely perform the work. This includes being familiar with special precautionary techniques, personal protective equipment, insulating and shielding materials, and insulated tools. [3]

1\.4\. Training

All personnel involved in low voltage electrical work must receive adequate training on electrical safety, hazard awareness, and the proper use of tools and equipment. Training should cover:

  • Electrical hazards and risks
  • Lockout/Tagout procedures
  • Use of PPE
  • Safe work practices
  • Emergency procedures
  • Relevant safety regulations and standards

2\. Lockout/Tagout (LOTO) Procedures

2\.1\. De-energization

Whenever possible, low voltage electrical equipment must be completely disconnected and locked out before work is started. Control circuit devices, such as push buttons, selector switches, and interlocks, must not be used as the sole means for deenergizing circuits or equipment. [1]

2\.2\. LOTO Implementation

Follow a strict Lockout/Tagout procedure, including these steps:

  1. Identify all sources of electrical energy.
  2. Notify all affected employees.
  3. De-energize the equipment by disconnecting it from all power sources.
  4. Apply locks and tags to all disconnecting means. The lock must prevent operation of the disconnecting means without undue force or tools.
  5. Verify that the equipment is de-energized by testing the circuit elements and equipment parts with appropriate test equipment.
  6. Release any stored electrical energy by discharging capacitors and short-circuiting high capacitance elements.
  7. Block or relieve stored non-electrical energy that could re-energize the circuit.
  8. Ensure a written copy of the lockout/tagging procedures is maintained and available for inspection.

2\.3\. Verification of De-energization

Before starting work, a qualified person must use test equipment to verify that all circuit elements and electrical parts are de-energized. The test should also determine if any energized condition exists due to inadvertently induced voltage or unrelated voltage backfeed. If the circuit to be tested is over 600 volts, nominal, the test equipment shall be checked for proper operation immediately after this test. [5]

3\. Personal Protective Equipment (PPE)

3\.1\. Required PPE

Appropriate electrical protective equipment must be used, including:

  • Flame-retardant clothing
  • Voltage-rated rubber gloves with leather protectors
  • Eye protection (safety glasses or face shield)
  • Insulated tools
  • Other necessary live line tools

3\.2\. PPE Inspection and Maintenance

Inspect all PPE before each use for damage or defects. Ensure that rubber gloves are tested regularly according to applicable standards. Protective equipment shall be maintained in a safe, reliable condition and shall be periodically inspected or tested. [4]

4\. Safe Work Practices

4\.1\. Working on Energized Equipment

Work on energized equipment should only be performed when de-energizing is infeasible or creates a greater hazard. When work on energized equipment is necessary:

  • Use appropriate insulated tools and equipment.
  • Maintain safe working distances from exposed energized parts.
  • Use insulating barriers or covers to protect against accidental contact.
  • Ensure adequate lighting is available.
  • Avoid uncontrolled liquids near the work area.
  • Never use metal ladders, wooden ladders with wire-reinforced side rails, metal scaffolds, or metal work platforms.
  • Ensure up-to-date diagrams are available.

4\.2\. Working Near Energized Equipment

When working near uninsulated, energized parts of low voltage electrical equipment:

  • Uninsulated, energized parts of low voltage electrical equipment shall be guarded by approved cabinets or enclosures unless the energized parts are in a suitable room or similar enclosed area that is accessible only by qualified persons.
  • If uninsulated energized parts are not guarded, provide a suitable barrier or cover if a worker unfamiliar with the hazards is working within 1\.07 meters of the energized parts.
  • Inform workers of potential hazards and provide appropriate written safe work procedures.
  • Maintain the minimum clearance distance.

[2] [2]

4\.3\. Use of Test Equipment

Electrical test equipment must meet the requirements of CSA Standard C22\.2 No. 160, "Voltage and Polarity Testers" or CSA Standard CAN/CSA -22\.2 No. 231 Series-M89, CSA "Safety Requirements for Electrical and Electronic Measuring and Test Equipment". Appropriate safe work procedures shall be established and followed for testing electrical equipment and circuits. [1] [1]

4\.4\. Portable Electrical Equipment

When using portable electrical equipment:

  • Ensure that portable electrical equipment is grounded by the use of approved cords and polarized plugs inserted in grounded polarized receptacles, unless the equipment has double insulation or equivalent protection and is so marked.
  • When used outdoors or in a wet or damp location, portable electrical equipment shall be protected by an approved, CSA Certified, ground fault circuit interrupter (GFCI).
  • A ground fault circuit interrupter shall not be used as a substitute for grounding.
  • Visually inspect portable cord and plug connected equipment and flexible cord sets (extension cords) before each use for external defects and possible internal damage.

[2] [2] [2] [2] [4] 5\. Emergency Procedures

5\.1\. Emergency Contact Information

Ensure that emergency contact information, including phone numbers for emergency services, supervisors, and qualified medical personnel, is readily available.

5\.2\. Electrical Contact Emergency Response

In the event of electrical contact:

  • Immediately de-energize the circuit if safe to do so.
  • If it is not safe to de-energize the circuit, use a non-conductive object to separate the victim from the electrical source.
  • Call for emergency medical assistance.
  • Administer first aid and CPR if trained to do so.
  • Report the incident to the supervisor and safety department.

6\. Post-Work Procedures

6\.1\. Removal of LOTO

After completing the work:

  • A qualified person shall conduct tests and visual inspections, as necessary, to verify that all tools, electrical jumpers, shorts, grounds, and other such devices have been removed, so that the circuits and equipment can be safely energized.
  • Remove all tools, equipment, and debris from the work area.
  • Remove locks and tags according to the Lockout/Tagout procedure. Each lock and tag shall be removed by the employee who applied it or under their direct supervision.
  • Notify affected employees that the equipment is being re-energized.

[5]

6\.2\. Re-energizing Equipment

Before re-energizing the equipment, ensure that:

  • All personnel are clear of the equipment.
  • All guards and safety devices are in place.
  • The equipment is safe to operate.

6\.3\. Signage

After energizing low voltage electrical equipment, conspicuous signs visible to a worker shall be placed close to the equipment stating "Danger, Energized Equipment". [1]

7\. Regulatory Compliance

All low voltage electrical work must be performed in compliance with applicable safety regulations and standards, including:

  • Occupational Health and Safety Regulations
  • Canadian Electrical Code
  • OSHA Standards
  • Other relevant industry standards

8\. Review and Updates

This SOP shall be reviewed and updated periodically to reflect changes in regulations, standards, or work practices. Any revisions must be communicated to all affected employees.

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5 source record(s)

Sources used for this answer

[1] Occupational Health and Safety Regulations, 2012 (N.L. Reg. 5/12)

Page 184

Open source document

Source excerpt

# Back to Top ## Testing equipment 482. (1) Electrical test equipment may be used by qualified workers if it meets the requirements of (a) CSA Standard C22.2 No. 160, "Voltage and Polarity Testers"; or (b) CSA Standard CAN/CSA -22.2 No. 231 Series-M89, CSA "Safety Requirements for Electrical and Electronic Measuring and Test Equipment". (2) Appropriate safe work procedures shall be established and followed for testing electrical equipment and circuits. 5/12 s482 Back to Top ## Powerline hazards training 483. A person shall not operate a mobile crane, boom truck or similar equipment that has the capacity of encroaching on a power line without having first completed a safety training program on power line hazards required by the commission. 5/12 s483 ## Back to Top ## Low voltage electrical equipment - disconnection and lockout 484. (1) Low voltage electrical equipment shall be completely disconnected and locked out where required by Part IX before work is started on it. (2) Where it is not practicable to completely disconnect low voltage electrical equipment, work shall be performed in accordance with an electrical safety program in accordance with a standard acceptable to the minister that (a) includes emergency procedures and emergency release of victims; (b) requires the use of appropriate electrical protective equipment, including flame retardant clothing, voltage-related rubber gloves and cover up and other necessary live line tools; (c) provides that, where practicable, uncontrolled liquid is not permitted close to a worker working on the equipment; (d) prohibits the use of metal ladders, wooden ladders with wire reinforced side rails, metal scaffolds or metal work platforms; and (e) has available up to date diagrams. 5/12 s484 ## Back to Top ## Low voltage electrical equipment 485. Before completing installation and after energizing low voltage electrical equipment, conspicuous signs visible to a worker shall be placed close to…

[2] OSHA General Industry Standards Requiring Programs, Inspections, Procedures, Records and/or Training (NCDOL)

Page 159

Open source document

Source excerpt

# 1910.334-USE OF EQUIPMENT Scope/Application: The provisions of 1910.331 through 1910.335 cover electrical safety work practices for both qualified persons (those who have training in avoiding the electrical hazards of working on or near exposed energized parts) and unqualified persons (those with little or no such training). Exception: These standards do not apply to work performed by qualified persons on or directly associated with the following installations: Generation, transmission, and distribution of electric energy (including communication and metering) located in buildings used for such purposes or located outdoors. This work is covered by 1910.269-Electric Power Generation, Transmission, and Distribution. ## STANDARD HIGHLIGHTS Inspections and Tests-visual inspections before use ## Inspections and Tests 1910.334(a)(2)(i)-Portable cord and plug connected equipment and flexible cord sets (extension cords) shall be visually inspected before use on any shift for external defects (such as loose parts, deformed and missing pins, or damage to outer jacket or insulation) and for evidence of possible internal damage (such as pinched or crushed outer jacket). Cord and plug connected equipment and flexible cord sets (extension cords) which remain connected once they are put in place and are not exposed to damage need not be visually inspected until they are relocated. 1910.334(c)(2)-Visual inspection. Test instruments and equipment and all associated test leads, cables, power cords, probes, and connectors shall be visually inspected for external defects and damage before the equipment is used. If there is a defect or evidence of damage that might expose an employee to injury, the defective or damaged item shall be removed from service, and no employee may use it until repairs and tests necessary to render the equipment safe have been made. ## 1910.335-SAFEGUARDS FOR PERSONNEL PROTECTION Scope/Application: The provisions of 1910.331 through 1910.335 cover el…

[3] Occupational Health and Safety Regulations, 2012 (N.L. Reg. 5/12)

Page 185

Open source document

Source excerpt

# Back to Top (cont.) ## Low voltage electrical equipment (cont.) 5/12 s485 # Back to Top ## Working close to low voltage energized equipment 486. (1) Uninsulated, energized parts of low voltage electrical equipment shall be guarded by approved cabinets or enclosures unless the energized parts are in a suitable room or similar enclosed area that is accessible only by qualified persons. (2) An entrance to a room or other guarded location containing uninsulated and exposed energized parts shall be marked with a conspicuous warning sign limiting entry. (3) Where uninsulated energized parts are not guarded with approved cabinets or enclosures (a) a suitable barrier or cover shall be provided where a worker unfamiliar with the hazards is working within the limited approach boundary of 1.07 metres of the uninsulated, energized parts; or (b) a worker shall be informed of the potential hazards and provided with and follow appropriate written safe work procedures. 5/12 s486 ## Back to Top Low voltage electrical equipment - controls 487. An electrical distribution switch, circuit breaker and control shall be clearly marked to indicate the equipment it serves. 5/12 s487 ## Back to Top ## Grounding portable low voltage electrical equipment 488. (1) Portable electrical equipment having double insulation or equivalent protection and so marked, is not required to be grounded. (2) Portable electrical equipment, required to be grounded and not permanently connected to the wiring system, shall be effectively grounded by the use of approved cords and polarized plugs inserted in grounded polarized receptacles. 5/12 s488 ## Back to Top Low voltage electrical equipment - ground fault interrupters 489. (1) When used outdoors or in a wet or damp location, portable electrical equipment shall be protected by an approved, CSA Certified, ground fault circuit interrupter. (2) A ground fault circuit interrupter shall not be used as a substitute for grounding. 5/12 s48…

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

Page 481

Open source document

Source excerpt

# WAC 296-24-957 Electrical. (cont.) ## WAC 296-24-[redacted postal code] Appendices. Appendix A - Reference documents. (cont.) Chapter 296-24 WAC General Safety and Health Standards Part L Electrical NMAB 353-3-1980 Classification of Combustible Dusts in Accordance with the National Electrical Code. [Statutory Authority: RCW 49.17.010, .040, .050, and .060. 12-16-064 (Order 12-11), $ 296-24-[redacted postal code], filed 07/31/12, effective 09/01/12.] ## WAC 296-24-960 Working on or near exposed energized parts. (1) Application. This section applies to work performed on exposed live parts (involving either direct contact or contact by means of tools or materials) or near enough to them for employees to be exposed to any hazard they present. (2) Work on energized equipment. Only qualified persons must work on electric circuit parts or equipment that have not been deenergized under the procedures of WAC 296-24- 975(2). Such persons must be capable of working safely on energized circuits and must be familiar with the proper use of special precautionary techniques, personal protective equipment, insulating and shielding materials, and insulated tools. (3) General requirements - high voltage lines. (a) Minimum clearance. (i) You must not perform any work, you must not pile, store, or otherwise handle any material, you must not erect or dismantle any scaffolding, commercial signs, or structures, nor must you operate any tools, machinery or equipment within the specified minimum distances from any energized high voltage electrical conductor capable of energizing the material or equipment; except where the electrical distribution and transmission lines have been deenergized and visibly grounded at point of work, or where insulating barriers not a part of or an attachment to the equipment have been erected, to prevent physical contact with the lines, you must operate equipment proximate to, under, over, by, or near powerlines only in accordance with the followi…

[5] OSHA General Industry Standards Requiring Programs, Inspections, Procedures, Records and/or Training (NCDOL)

Page 157

Open source document

Source excerpt

# 1910.333-SELECTION AND USE OF WORK PRACTICES Scope/Application: The provisions of 1910.331 through 1910.335 cover electrical safety work practices for both qualified persons (those who have training in avoiding the electrical hazards of working on or near exposed energized parts) and unqualified persons (those with little or no such training). Exception: These standards do not apply to work performed by qualified persons on or directly associated with the following installations: Generation, transmission, and distribution of electric energy (including communication and metering) located in buildings used for such purposes or located outdoors. This work is covered by 1910.269-Electric Power Generation, Transmission, and Distribution. ## STANDARD HIGHLIGHTS - Programs, Plans and Procedures-safety-related work practices, lockout/tagout procedures - Inspections and Tests-visual inspections, tests - Recordkeeping-procedures - Training and Communications-familiar with techniques - Qualified Person-inspections - Signs, Markings and Tags-posted signs ## Programs, Plans and Procedures 1910.333(a)-General. Safety-related work practices shall be employed to prevent electric shock or other injuries resulting from either direct or indirect electrical contacts, when work is performed near or on equipment or circuits which are or may be energized. The specific safety-related work practices shall be consistent with the nature and extent of the associated electrical hazards. 1910.333(b)(2)-Lockout and Tagging. While any employee is exposed to contact with parts of fixed electric equipment or circuits which have been deenergized, the circuits energizing the parts shall be locked out or tagged or both in accordance with the requirements of this paragraph. The requirements shall be followed in the order in which they are presented (i.e., paragraph (b)(2)(i) [Procedures] first, then paragraph (b)(2)(ii)[Deenergizing Equipment], etc.). 1910.333(b)(2)(i)-Procedures. The emp…

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