Method Statement : Test and Commissioning of Electrical Installations

Explanation

The test and commissioning of electrical installations is a critical process undertaken in both new build and refurbishment projects within domestic and commercial settings, such as kitchens, washrooms, and laundries. This procedure involves a systematic evaluation of electrical systems to ensure they are installed correctly, function as intended, and comply with relevant safety standards and regulations. The primary aim is to verify the integrity and performance of the electrical installation, identify any defects or non-compliances, and ensure the safety and reliability of the system before it is put into service. This process is essential to safeguard both the property and its occupants from potential electrical hazards.

Responsibilities

• Project Manager : Ensure all testing and commissioning activities are planned and coordinated effectively.
• Electrical Engineer : Oversee the testing and commissioning process, ensuring compliance with relevant standards and regulations.
• Test Technician : Conduct tests on electrical installations, ensuring all procedures are followed safely and accurately.
• Health and Safety Officer : Monitor safety compliance during testing activities and ensure all safety protocols are adhered to.
• Site Supervisor : Ensure the work area is safe and that all personnel are aware of potential hazards.
• Quality Assurance Inspector : Verify that the electrical installations meet the required quality standards post-commissioning.
• Client Representative : Review and approve the commissioning results, ensuring they meet project specifications.

Equipment

• Insulated hand tools
• Multimeter
• Insulation resistance tester
• Earth loop impedance tester
• Residual current device (RCD) tester
• Voltage indicator
• Personal protective equipment (PPE)
• Arc flash clothing
• Safety footwear
• Safety helmet
• Safety glasses
• Ear protection
• Lockout/tagout devices

Operation

• Conduct a thorough risk assessment specific to the site and task.
• Ensure all personnel involved are adequately trained and competent.
• Verify that all necessary permits and authorisations are in place.
• Confirm that the electrical installation is complete and ready for testing.
• Verify isolation of the electrical supply using appropriate lockout/tagout procedures.
• Conduct a visual inspection of the installation to identify any defects or non-compliance.
• Ensure all testing equipment is calibrated and in good working condition.
• Perform continuity tests on all protective conductors.
• Conduct insulation resistance testing on all circuits.
• Check the polarity of all circuits to confirm correct connections.
• Measure the earth fault loop impedance to ensure effective operation of protective devices.
• Test Residual Current Devices (RCDs) for proper operation and tripping times.
• Conduct functional tests on all installed equipment and systems.
• Re-energise the system, ensuring all personnel are clear of live parts.
• Perform a final inspection to ensure all components are secure and operational.
• Document all test results and any corrective actions taken.
• Provide a comprehensive handover to the client or responsible person, including a briefing on operation, maintenance, and safety considerations.

Risk Assessment : Test and Commissioning of Electrical Installations

Who might be harmed: Electrical Engineers | Electricians | Commissioning Technicians | Maintenance Personnel

Type of harm: Burns | Death | Electrocution

Initial Risk: Severe (4) x Occasional (3) = Medium (12) Controls

• Ensure all electrical installations are de-energised and locked out before commencing work, using lockout/tagout procedures.
• Use insulated tools and personal protective equipment, such as rubber gloves and boots, to minimise contact with live parts.
• Verify the absence of voltage using a suitable testing device before beginning any work on electrical installations.
• Maintain a safe distance from live electrical components and ensure barriers or covers are in place where necessary.
• Conduct regular training for personnel on electrical safety practises and emergency response procedures.
• Implement a permit-to-work system to control and authorise activities involving live electrical testing.
• Ensure all testing equipment is regularly inspected, maintained, and calibrated to prevent malfunctions.
• Provide clear signage and warnings around areas where live testing is being conducted to alert personnel of potential hazards.

Residual Risk: Minor (1) x Improbable (1) = Low (1)

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Arc Flash : Low (1)

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Who might be harmed: Electrical Engineers | Commissioning Technicians | Maintenance Personnel | Construction Workers | Site Supervisors

Type of harm: Burns | Death | Eye Damage | Multiple / Various Injury

Initial Risk: Catastrophic (5) x Frequent (5) = High (25) Controls

• Ensure all personnel are trained in recognising arc flash hazards and the correct procedures to follow during testing and commissioning.
• Utilise appropriate personal protective equipment (PPE) such as arc-rated clothing, face shields, and gloves specifically designed for electrical work.
• Implement lockout/tagout procedures to ensure equipment is de-energised before commencing work.
• Conduct a thorough risk assessment to identify potential arc flash hazards and implement necessary precautions.
• Maintain a safe distance from live electrical components and use insulated tools to minimise exposure.
• Clearly label electrical panels and equipment with arc flash warning signs to alert personnel of potential risks.
• Regularly inspect and maintain electrical equipment to ensure it is in good working condition and free from defects.
• Establish and enforce a strict protocol for working on or near live electrical systems, including the use of barriers or shields where necessary.

Residual Risk: Minor (1) x Improbable (1) = Low (1)

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Fire : Low (1)

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Who might be harmed: Electrical Engineers | Commissioning Technicians | Construction Workers | Facility Maintenance Staff | Building Occupants

Type of harm: Asphyxia | Burns | Death | Smoke Inhalation

Initial Risk: Catastrophic (5) x Frequent (5) = High (25) Controls

• Ensure all electrical installations are thoroughly inspected and tested for faults before commissioning to prevent potential fire hazards.
• Use appropriate circuit protection devices, such as fuses and circuit breakers, to automatically disconnect faulty circuits.
• Maintain clear access to fire extinguishers and ensure personnel are trained in their use in case of an electrical fire.
• Implement a strict no-smoking policy in areas where electrical testing and commissioning are conducted.
• Ensure all equipment used during testing is in good condition and free from damage that could lead to overheating or sparks.
• Conduct regular fire risk assessments and update emergency procedures specific to the test and commissioning environment.
• Ensure proper ventilation in areas where testing is conducted to prevent the accumulation of flammable gases.
• Label and isolate circuits not under test to prevent accidental energisation and potential fire risks.

Residual Risk: Minor (1) x Improbable (1) = Low (1)

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Overheating : Low (1)

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Who might be harmed: Electrical Engineers | Commissioning Technicians | Site Supervisors | Maintenance Personnel

Type of harm: Burns | Heat Stroke / Exhaustion

Initial Risk: Major (3) x Probable (4) = Medium (12) Controls

• Ensure all equipment is regularly maintained and inspected to prevent overheating during use.
• Utilise thermal imaging cameras to identify hotspots in electrical installations before commencing testing.
• Implement a cooling-off period for equipment that has been in continuous operation to prevent overheating.
• Provide adequate ventilation in the work area to dissipate heat generated by electrical equipment.
• Train personnel to recognise signs of overheating and take immediate action to mitigate risks.
• Use equipment with built-in thermal protection features to automatically shut down if overheating occurs.

Residual Risk: Minor (1) x Improbable (1) = Low (1)

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Explosions : Low (1)

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Who might be harmed: Electrical Engineers | Commissioning Technicians | Construction Workers | Facility Maintenance Staff

Type of harm: Burns | Broken Bones | Death | Eye Damage | Head Injury | Multiple / Various Injury | Permanent Hearing Damage | Smoke Inhalation

Initial Risk: Catastrophic (5) x Occasional (3) = Medium (15) Controls

• Ensure all equipment and tools are intrinsically safe and suitable for use in potentially explosive atmospheres.
• Conduct a thorough risk assessment to identify and mitigate potential sources of ignition in the work area.
• Implement strict permit-to-work systems to control activities in hazardous environments.
• Maintain proper ventilation to prevent the accumulation of flammable gases or dust.
• Use explosion-proof lighting and communication devices during testing and commissioning activities.
• Train personnel on the specific hazards of explosive environments and emergency response procedures.
• Regularly inspect and maintain equipment to ensure it is in good working condition and free from defects.

Residual Risk: Minor (1) x Improbable (1) = Low (1)

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Trips and Slips : Low (1)

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Who might be harmed: Electrical Engineers | Commissioning Technicians | Site Supervisors | Construction Workers | Maintenance Personnel

Type of harm: Back / Spinal Injury | Broken Bones | Cuts and Abrasions | Head Injury | Muscular Injury

Initial Risk: Major (3) x Frequent (5) = Medium (15) Controls

• Ensure all cables are securely fastened and routed away from walkways to prevent tripping hazards.
• Maintain a tidy work area by promptly removing any unnecessary tools or equipment.
• Use cable covers or mats to protect and manage cables crossing pedestrian paths.
• Conduct regular inspections of the work area to identify and rectify potential trip hazards.
• Ensure adequate lighting is provided to enhance visibility and reduce the risk of trips.
• Implement a clear housekeeping protocol to ensure workspaces are kept free of clutter.
• Provide training to personnel on the importance of maintaining a safe and organised work environment.

Residual Risk: Minor (1) x Improbable (1) = Low (1)

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Harmful Substances : Low (1)

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Who might be harmed: Electrical Engineers | Commissioning Technicians | Maintenance Personnel

Type of harm: Asbestosis / Lung Cancer / Mesothelioma | Dermatitis | Respiratory damage / Asthma / COPD

Initial Risk: Severe (4) x Frequent (5) = High (20) Controls

• Ensure that all personnel are provided with and wear appropriate personal protective equipment (PPE), such as gloves and masks, when handling or exposed to harmful substances.
• Conduct a thorough risk assessment to identify potential harmful substances present in the work area and implement appropriate control measures.
• Provide adequate ventilation in areas where harmful substances may be present to reduce inhalation risks.
• Implement safe storage practises for chemicals and materials used during testing to prevent accidental exposure.
• Ensure that all personnel are trained in the safe handling and disposal of harmful substances encountered during testing activities.
• Establish emergency procedures for dealing with spills or exposure incidents involving harmful substances.

Residual Risk: Minor (1) x Improbable (1) = Low (1)

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Manual Handling : Low (1)

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Who might be harmed: Electrical Engineers | Technicians | Apprentices | Contractors | Maintenance Personnel

Type of harm: Back / Spinal Injury | Broken Bones | Crush / Entrapment | Cuts and Abrasions | Muscular Injury

Initial Risk: Severe (4) x Probable (4) = Medium (16) Controls

• Use mechanical aids such as trolleys or hoists to transport heavy equipment to the testing site.
• Ensure that all personnel are trained in proper lifting techniques to minimise the risk of musculoskeletal injuries.
• Plan the layout of the work area to minimise the need for manual handling by positioning equipment close to where it will be used.
• Conduct a risk assessment prior to moving equipment to identify potential hazards and implement appropriate controls.
• Encourage team lifting for heavy or awkward items to distribute the load and reduce individual strain.
• Limit the weight of equipment that needs to be manually handled by breaking down loads into smaller, manageable parts.
• Provide personal protective equipment, such as gloves, to improve grip and reduce the risk of injury during handling.

Residual Risk: Minor (1) x Improbable (1) = Low (1)

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Noise : Low (1)

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Who might be harmed: Electrical Engineers | Commissioning Technicians | Construction Workers | Site Supervisors

Type of harm: Permanent Hearing Damage

Initial Risk: Major (3) x Probable (4) = Medium (12) Controls

• Conduct a noise assessment prior to commencing work to identify areas where noise levels may exceed safe limits.
• Provide and enforce the use of appropriate hearing protection, such as earplugs or earmuffs, for all personnel working in high-noise areas.
• Schedule noisy activities during times when fewer personnel are present to minimise exposure.
• Implement engineering controls, such as sound barriers or enclosures, to reduce noise levels at the source.
• Ensure regular maintenance of equipment to prevent excessive noise from faulty or worn components.
• Limit the duration of exposure to high noise levels by rotating personnel or scheduling breaks.
• Provide training for workers on the risks associated with noise exposure and the correct use of hearing protection.

Residual Risk: Minor (1) x Improbable (1) = Low (1)

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Inadequate Lighting : Low (1)

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Who might be harmed: Electrical Engineers | Commissioning Technicians | Site Supervisors | Construction Workers | Maintenance Personnel

Type of harm: Back / Spinal Injury | Broken Bones | Cuts and Abrasions | Head Injury | Multiple / Various Injury

Initial Risk: Major (3) x Occasional (3) = Medium (9) Controls

• Ensure adequate task lighting is provided in all areas where testing and commissioning activities are conducted.
• Use portable lighting equipment to illuminate dark or poorly lit areas during testing procedures.
• Conduct a pre-task lighting assessment to identify and address any insufficient lighting conditions.
• Ensure all lighting equipment is regularly maintained and tested for functionality prior to use.
• Position lighting to minimise shadows and glare that could obscure visibility during tasks.

Residual Risk: Minor (1) x Improbable (1) = Low (1)

COSHH Assessment : Test and Commissioning of Electrical Installations

Insulating oils

Insulating oils are utilised in transformers and switchgear to provide electrical insulation and dissipate heat.

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Inhalation : Low (1)

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Who might be harmed: Electrical engineers | Commissioning technicians | Maintenance personnel

Type of harm: Respiratory damage / Asthma / COPD

Initial Risk: Major (3) x Probable (4) = Medium (12) Controls

• Ensure adequate ventilation in the work area to disperse fumes.
• Use appropriate respiratory protective equipment when ventilation is insufficient.
• Store insulating oils in sealed containers to prevent vapour release.
• Limit time spent in areas where insulating oils are used.
• Implement regular air quality monitoring to detect harmful vapour levels.

Residual Risk: Minor (1) x Improbable (1) = Low (1)

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Eye Contact : Low (1)

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Who might be harmed: Electrical engineers | Commissioning technicians | Maintenance personnel

Type of harm: Eye Damage

Initial Risk: Catastrophic (5) x Occasional (3) = Medium (15) Controls

• Wear safety goggles or face shields to prevent insulating oil splashes.
• Ensure proper ventilation to reduce airborne droplets of insulating oils.
• Use oil-resistant barriers or screens to contain potential splashes.
• Implement safe handling procedures to minimise the risk of spills.
• Provide training on emergency eye wash station locations and use.

Residual Risk: Minor (1) x Improbable (1) = Low (1)

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Skin Contact : Low (1)

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Who might be harmed: Electricians | Commissioning technicians | Maintenance personnel

Type of harm: Dermatitis

Initial Risk: Catastrophic (5) x Frequent (5) = High (25) Controls

• Wear appropriate personal protective equipment, such as chemical-resistant gloves, to prevent direct skin contact with insulating oils.
• Use long-sleeved clothing and coveralls to minimise skin exposure to insulating oils.
• Implement proper handling procedures to avoid spills and splashes of insulating oils.
• Provide washing facilities with soap and water for immediate decontamination in case of skin contact.
• Conduct regular training sessions on safe handling and use of insulating oils to ensure awareness of potential skin hazards.

Residual Risk: Minor (1) x Improbable (1) = Low (1)

Cleaning solvents

Cleaning solvents are intended for the removal of dirt, grease, and other contaminants from electrical components to ensure optimal performance and safety during testing and commissioning.

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Inhalation : Low (1)

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Who might be harmed: Electricians conducting the test and commissioning. | Other construction workers in the vicinity. | Facility maintenance staff.

Type of harm: Asphyxia | Respiratory damage / Asthma / COPD | Smoke Inhalation

Initial Risk: Catastrophic (5) x Frequent (5) = High (25) Controls

• Ensure adequate ventilation in the work area to disperse solvent vapours.
• Use appropriate respiratory protective equipment, such as masks or respirators, when necessary.
• Limit the amount of solvent used to minimise vapour concentration.
• Store solvents in tightly sealed containers when not in use to prevent evaporation.
• Implement a solvent handling procedure that includes safe usage and disposal practises.

Residual Risk: Minor (1) x Improbable (1) = Low (1)

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Eye Contact : Low (1)

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Who might be harmed: Electricians | Commissioning engineers | Maintenance personnel

Type of harm: Eye Damage

Initial Risk: Major (3) x Frequent (5) = Medium (15) Controls

• Wear safety goggles or face shields to prevent solvent splashes into the eyes.
• Ensure proper ventilation to reduce the concentration of solvent vapours in the air.
• Use solvent applicators or dispensers to minimise direct handling and splashing.
• Provide eye wash stations nearby for immediate rinsing in case of exposure.
• Train workers on the correct use and handling of cleaning solvents to prevent accidents.

Residual Risk: Minor (1) x Improbable (1) = Low (1)

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Skin Contact : Low (1)

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Who might be harmed: Electricians | Commissioning engineers | Maintenance personnel | Construction workers

Type of harm: Dermatitis

Initial Risk: Major (3) x Probable (4) = Medium (12) Controls

• Wear appropriate chemical-resistant gloves to prevent direct skin exposure.
• Use long-sleeved clothing to minimise skin contact with solvents.
• Apply barrier creams to exposed skin areas before handling solvents.
• Ensure proper ventilation to reduce solvent concentration in the air.
• Wash hands and any exposed skin thoroughly after handling solvents.
• Provide training on safe handling and emergency procedures for solvent exposure.

Residual Risk: Minor (1) x Improbable (1) = Low (1)

Solder fumes

Solder fumes are generated during the soldering process, which is used to join electrical components and ensure secure connections within installations.

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Inhalation : Low (1)

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Who might be harmed: Electricians conducting the test and commissioning. | Apprentices or trainees assisting with the work. | Other tradespeople working in close proximity. | Facility maintenance staff present during operations.

Type of harm: Asbestosis / Lung Cancer / Mesothelioma | Asphyxia | Respiratory damage / Asthma / COPD | Smoke Inhalation

Initial Risk: Major (3) x Frequent (5) = Medium (15) Controls

• Ensure adequate ventilation in the work area to disperse fumes.
• Use local exhaust ventilation systems, such as fume extractors, at the source.
• Provide and enforce the use of appropriate respiratory protective equipment.
• Implement regular maintenance and checks on ventilation systems for effectiveness.
• Limit time spent in areas with high concentrations of solder fumes.
• Conduct air quality monitoring to ensure fume levels remain below occupational exposure limits.

Residual Risk: Minor (1) x Improbable (1) = Low (1)

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Eye Contact : Low (1)

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Who might be harmed: Electricians conducting the test and commissioning. | Apprentices or trainees assisting with the work.

Type of harm: Eye Damage

Initial Risk: Catastrophic (5) x Probable (4) = High (20) Controls

• Ensure proper ventilation systems are in place to disperse fumes away from the work area.
• Provide and enforce the use of safety goggles or face shields to protect eyes from exposure.
• Implement a fume extraction system directly at the source of soldering activities.
• Conduct regular training on the correct use of personal protective equipment for eye protection.
• Position workstations to minimise direct exposure to rising fumes during soldering tasks.

Residual Risk: Minor (1) x Improbable (1) = Low (1)

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Skin Contact : Low (1)

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Who might be harmed: Electricians | Commissioning engineers | Maintenance personnel

Type of harm: Burns | Dermatitis

Initial Risk: Major (3) x Occasional (3) = Medium (9) Controls

• Wear appropriate personal protective equipment, such as gloves, to prevent direct skin contact with solder fumes.
• Ensure proper ventilation in the work area to reduce fume concentration and minimise skin exposure.
• Implement regular cleaning of work surfaces to remove any settled solder particles that may come into contact with skin.

Residual Risk: Minor (1) x Improbable (1) = Low (1)

Dust from drilling or cutting materials

Dust from drilling or cutting materials is not intended for use but is an incidental byproduct generated during the preparation and installation of electrical components in walls or panels.

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Inhalation : Low (1)

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Who might be harmed: Electricians conducting the test and commissioning. | Construction workers in the vicinity. | Maintenance personnel present on-site. | Cleaning staff working in the area.

Type of harm: Asbestosis / Lung Cancer / Mesothelioma | Respiratory damage / Asthma / COPD | Smoke Inhalation

Initial Risk: Severe (4) x Frequent (5) = High (20) Controls

• Use local exhaust ventilation systems to capture dust at the source.
• Provide and ensure the use of appropriate respiratory protective equipment (RPE).
• Implement wet cutting techniques to suppress dust generation.
• Enclose the work area with barriers to contain dust spread.
• Schedule regular maintenance and cleaning of ventilation and dust control equipment.
• Conduct air monitoring to assess dust levels and effectiveness of controls.
• Train workers on the hazards of dust and proper use of control measures.

Residual Risk: Minor (1) x Improbable (1) = Low (1)

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Eye Contact : Low (1)

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Who might be harmed: Electricians | Commissioning engineers | Construction workers | Maintenance personnel

Type of harm: Eye Damage

Initial Risk: Catastrophic (5) x Probable (4) = High (20) Controls

• Workers should wear safety goggles or face shields to prevent dust particles from entering the eyes.
• Ensure that dust extraction systems are in place and functioning effectively to minimise airborne dust.
• Position workers so that they are not directly in the path of dust emissions.
• Regularly clean work areas to reduce the accumulation of dust on surfaces.
• Provide training on proper use and maintenance of personal protective equipment.

Residual Risk: Minor (1) x Improbable (1) = Low (1)

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Skin Contact : Low (1)

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Who might be harmed: Electricians | Commissioning engineers | Construction workers | Maintenance personnel

Type of harm: Dermatitis

Initial Risk: Major (3) x Frequent (5) = Medium (15) Controls

• Wear long-sleeved clothing and gloves to minimise skin exposure to dust.
• Use barrier creams to provide an additional protective layer on exposed skin.
• Implement wet cutting techniques to reduce dust generation at the source.
• Regularly clean work areas to prevent dust accumulation on surfaces.
• Provide washing facilities for workers to clean skin after exposure.

Residual Risk: Minor (1) x Improbable (1) = Low (1)

Toolbox Talk : Test and Commissioning of Electrical Installations

Introduction

The test and commissioning of electrical installations is a critical process undertaken in both new build and refurbishment projects within domestic and commercial settings, such as kitchens, washrooms, and laundries. This procedure involves a systematic evaluation of electrical systems to ensure they are installed correctly, function as intended, and comply with relevant safety standards and regulations. The primary aim is to verify the integrity and performance of the electrical installation, identify any defects or non-compliances, and ensure the safety and reliability of the system before it is put into service. This process is essential to safeguard both the property and its occupants from potential electrical hazards.

Hazards

The test and commissioning of electrical installations in domestic and commercial settings, particularly within kitchens, washrooms, and laundries, present several significant hazards. The primary danger is the risk of electric shock from contact with live electrical parts, which can occur if proper isolation procedures are not followed. There is also a risk of arc flash incidents, which can result in severe burns or other injuries. The potential for fires due to electrical faults or short circuits is heightened in these environments, where water and moisture are prevalent. Additionally, the presence of hazardous voltages and currents poses a risk of serious injury or fatality. The confined spaces and presence of water increase the likelihood of slips, trips, and falls, while manual handling of heavy equipment can lead to musculoskeletal injuries. Furthermore, noise from electrical equipment may contribute to hearing loss if not adequately managed.

Test and Commissioning of Electrical Installations : Rules

• Do ensure all personnel involved are adequately trained and competent.
• Do conduct a thorough risk assessment prior to commencing work.
• Do verify that all equipment and tools are in good working condition.
• Do wear appropriate personal protective equipment (PPE), such as insulated gloves and safety goggles.
• Do ensure that all testing equipment is properly calibrated.
• Do establish clear communication protocols among team members.
• Do implement lockout/tagout procedures to ensure circuits are de-energised when necessary.
• Do maintain a tidy and organised work area to prevent trips and falls.
• Do use insulated tools and equipment designed for electrical work.
• Do follow manufacturer’s instructions and industry standards for testing procedures.
• Do ensure adequate lighting in the work area for visibility.
• Do keep a safe distance from live electrical parts whenever possible.
• Do have an emergency response plan in place, including first aid measures.
• Do document all testing results and any issues identified during commissioning.
• Do report any hazards or incidents immediately to the appropriate authority.

Test and Commissioning of Electrical Installations : Warnings

• Do not commence testing without a thorough risk assessment.
• Do not work on live circuits unless absolutely necessary and authorised.
• Do not bypass or disable safety devices or interlocks.
• Do not use damaged or faulty testing equipment.
• Do not wear conductive jewellery or clothing while working.
• Do not leave tools or equipment unattended in hazardous areas.
• Do not ignore warning signs or alarms during testing.
• Do not work alone when testing high-risk installations.
• Do not rush the testing process; adhere to all safety protocols.
• Do not neglect to report any safety incidents or near misses immediately.

Induction Record

Company name:		Project title:
Location:		Contract No:

Subject:	Risk Assessment and Method Statement : Test and Commissioning of Electrical Installations	Tutor:
Date:		Signature:

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