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Electrical Safety Guidance for Working on Construction Sites

Working with electricity in any environment can be highly dangerous but particularly so on a construction site where the hazards have the potential to be on a much bigger scale.

It’s often a lack of awareness that causes the most damage so it’s essential that anyone required to work on a construction site understands the risks and knows how to act to avoid themselves, or anyone else, coming to harm as a result of electricity.

Use this guide to electrical safety below to help develop your understanding of the risks.

Things to Consider Before Working on a Construction Site

Before you begin any work on a construction site there are three key things that you need to consider:

1. Risk assessments

Before work on a construction site begins the person in charge, by law, must carry out a risk assessment. The aim of this is to identify all of the potential electrical hazards and ensure that suitable control measures are in place to prevent them from causing harm to workers. If you are an employee about to start work on a construction site then make sure you familiarise yourself with the results of the risk assessment so you understand which hazards you need to look out for.

2. Electrical services maps

As part of the risk assessment process your site operator should have obtained up-to-date maps from the local council that detail where any potentially hazardous wires, cables or electrical equipment are located within (or near to) the construction site. Again, ensure you have familiarised yourself with these maps (if any) before beginning work.

3. Safe systems of work / Work Permits

If your role on the construction site requires working directly with (or near) live electricity then it’s important that you’re fully trained and competent to carry out the work safely. Your employer will have set out a safe system of work which specifies the competence, skills and knowledge required to do this task. Before beginning work, ensure that you’ve read the Safe Systems of Work document carefully and have taken on board all information and/or training provided by your employer.

Common Electrical Safety Hazards on Construction Sites

Your employer’s risk assessment will have identified the potential electrical hazards on the construction site so make sure you’re familiar with what has been learned and what controls are in place that you must follow. Each construction site is likely to have different hazards that are unique to them so it’s important that you pay attention to each individual risk assessment. However, some hazards are common on all construction sites, such as:

Overhead power lines

Over 50% of fatal electrical accidents are caused by contact with overhead electric power lines. Often this is due to lack of awareness because a risk assessment hasn’t been conducted or workers haven’t educated about the hazards. If machinery or vehicles get too close to power lines then electricity will be conducted through them – as well as through anyone using or touching the equipment at the time.

If you need to carry out work near overhead power lines then it’s vital to take precautions to prevent accidents happening. This includes consulting the local municipality about how to proceed safely; asking the local municipality if power lines can be switched off before work begins and always assuming that power lines pose a risk, never being complacent.

Underground power cables

Underground power cables can be more hazardous than overhead ones as they are hidden from view and you may not know about them until it’s too late. It’s also impossible to tell by sight whether these cables are live when they are uncovered. Care needs to be taken when carrying out digging tasks on all construction sites, particularly if working on streets, pavements or near buildings.

If you need to carry out work near underground power cables then you’ll need to take appropriate precautions. This includes consulting the local municipality, road agency and council for up-to-date maps of buried services; using suitable cable-avoidance tools; following safe digging practices and always assuming that cables will be present before beginning any sort of digging work.

Electrical equipment and/or machinery

It’s guaranteed that your role on a construction site will involve some sort of electrical equipment, whether it’s a hand-held portable tool, something bigger that’s plugged into the mains or a large piece of machinery. If you are required to use electrical equipment of any type then it’s important that you’re trained and competent to operate it (this is a requirement under the Construction Regulations 2014).

To use electrical equipment safely: carry out a quick visual inspection before use; ensure that isolation devices work correctly; reduce the supply voltage where possible; always turn the equipment off when not in use and never use electrical equipment that is showing signs of damage.

Electrical Safety Signs on Construction Sites

Electrical safety signs are used to alert you of any potentially high voltages, overhead power lines or other electrical hazards that you need to be aware of whilst on-site. If you see any warning signs on a construction site it’s imperative that you pay attention to them: these signs are there to protect your safety and should never be ignored.


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