How can you ensure electrical equipment is de-energized before maintenance or repair?

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Working with electrical equipment can be hazardous if you don't follow proper safety procedures. One of the most important steps to prevent electric shocks, burns, fires, or explosions is to ensure that the equipment is de-energized before you perform any maintenance or repair. This means that the equipment is disconnected from any source of electrical power and locked or tagged out to prevent accidental re-energization. In this article, we'll explain how you can ensure electrical equipment is de-energized before maintenance or repair in the context of construction.

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Adam Gillespie, ME

Service Sales Specialist at Eaton
Keith K Kaneko AIA

Permanent Retired Architect, AIA Emeritus
Godwin Godfrey D'souza

CHIEF RIG ELECTRICIAN WORKED FOR BORR DRILLING DOHA QATAR.

1 Know the hazards

Before you start working on any electrical equipment, you should identify the potential hazards and risks involved. You should know the voltage, current, and circuit configuration of the equipment, as well as the location and condition of the power sources, switches, breakers, fuses, and wires. You should also be aware of any other sources of energy that could affect the equipment, such as batteries, capacitors, solar panels, generators, or backup systems. You should always assume that the equipment is energized until you verify otherwise.

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2 Follow the LOTO procedure

To ensure electrical equipment is de-energized before maintenance or repair, the lockout/tagout (LOTO) procedure should be followed. This standardized method isolates and controls hazardous energy sources during servicing or maintenance activities, and consists of six steps. Preparation involves reviewing the work plan, identifying the energy sources, and gathering the necessary tools and devices. Shutdown is done by turning off or shutting down the equipment using normal operating controls. Isolation is achieved by disconnecting or isolating the equipment from energy sources with devices such as breakers, disconnects, valves, or plugs. Lockout/Tagout applies locks or tags to the isolation devices to prevent anyone from re-energizing the equipment. Verification tests the equipment to make sure it is de-energized and not stored with residual energy. Finally, Release removes the locks or tags and restores the equipment to its normal operating condition after work is completed and it is safe to do so.

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Adam Gillespie, ME

Service Sales Specialist at Eaton
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I see all to often people blindly apply their locks under the direction of others with no understanding of what they're isolating. My best piece of advise is ask questions! If your unsure reference the line diagram and work your way back. Always test with a potential meter (testing a known live circuit first) wearing the appropriate arc flash PPE after isolation, before work takes place.

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Keith K Kaneko AIA

Permanent Retired Architect, AIA Emeritus
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Follow OSHA Standards: The lockout tagout (LOTO) is a process whereby a lock and tag are added to any type of industrial equipment or machinery when it is shut down for repair, servicing, or maintenance as part of OSHA-recommended best practices. OSHA defines LOTO as “specific practices and procedures to safeguard all workers from the unexpected startup of machinery and equipment or the release of hazardous energy during service or maintenance”.

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Godwin Godfrey D'souza

CHIEF RIG ELECTRICIAN WORKED FOR BORR DRILLING DOHA QATAR.
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A proper Permit is to be obtained with the Signed Authority person for LOTO & Isolation PERMIT. And the Keys & the Permit has to be Keeped in proper in it's placed.

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3 Follow the best practices

In addition to following the LOTO procedure, it is essential to follow some best practices for ensuring electrical equipment is de-energized before maintenance or repair. This includes wearing appropriate personal protective equipment (PPE), such as gloves, goggles, boots, and clothing. It is also important to use insulated tools and equipment that are rated for the voltage and current of the circuit you are working on. Furthermore, you should avoid contact with any exposed or live wires, terminals, or components that could be energized and stay away from any overhead or underground power lines that could cause electrocution or interference. Lastly, if you come across any damaged, defective, or malfunctioning electrical equipment, report it to your supervisor or manager and mark it as out of service until it is repaired or replaced. By following these steps and practices, you can ensure electrical equipment is de-energized before maintenance or repair and prevent injuries, damages, or accidents on the construction site.

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Christopher Tucker, P.E.

Project Manager for exp Federal
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The most important step of any Lock out policy is to VERIFY ZERO ENERGY prior to performing any work with the appropriate equipment, for example a CAT III volt meter. This should be performed by a trained and qualified person to ensure the safety of all personnel. Coupled with an effective Lock Out program, hazardous conditions can be eliminated.

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4 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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How can you ensure electrical equipment is de-energized before maintenance or repair?

1

2

3

4

1 Know the hazards

2 Follow the LOTO procedure

3 Follow the best practices

4 Here’s what else to consider

Construction

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How can you ensure electrical equipment is de-energized before maintenance or repair?

1

2

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4

1 Know the hazards

2 Follow the LOTO procedure

3 Follow the best practices

4 Here’s what else to consider

Construction

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