Question 1

Can you review our electrical safety rules?

Accepted Answer

Yes. We review and revise electrical safety rules and help you develop safe systems of work and operational practices. The aim is to keep your network safety management arrangements current and robust, preventing danger to staff and the general public while reflecting your operational context. We bring industry proven experience of electricity networks to this work, so the rules we help you produce are workable for the people who operate and maintain the equipment day to day, not just correct on paper. A safety rules review often sits alongside our wider electrical safety services, which include independent reviews of safety management processes and procedures, reviews of contractor safety management arrangements, ISO 45001 audits and gap analysis, and arc flash hazard management. Whether your rules need a light refresh to reflect changes on the network or a more fundamental rewrite, the outcome is the same: safety risks reduced to acceptable levels within a framework your teams understand and follow.

Question 2

Do you carry out arc flash hazard studies?

Accepted Answer

We provide arc flash hazard management, including arc flash hazard studies and risk assessments. These identify where arc flash risk arises on your network and support proportionate controls that reduce the risk to staff working on or near electrical equipment. Our work in this area extends to arc flash and internal arc guidance for electricity network assets, covering equipment such as switchgear, transformers and substations across DNO, industrial and renewable applications. Because arc flash risk depends heavily on how a network is configured and operated, we assess the hazard within your specific operational context rather than applying generic assumptions. The findings feed directly into your wider safety management arrangements: they can inform your electrical safety rules, safe systems of work and operational practices, all of which we can help you develop or revise. The result is a clear picture of where the risk lies and a practical, prioritised basis for reducing it.

Question 3

Can Threepwood audit our safety management system?

Accepted Answer

We offer independent reviews of your safety management processes and procedures, including contractor safety management, as well as ISO 45001 audits and gap analysis. An independent view helps confirm your arrangements reduce safety risks to acceptable levels and highlights where improvements are needed. Our reviewers bring industry proven experience of electricity networks, so they understand how safety management systems work in practice on operational networks, not just how they read on paper. A review can look across the full range of your arrangements, from electrical safety rules and safe systems of work to the processes you use to select, manage and monitor contractors working on your assets. Where we use ISO 45001 as the benchmark, a gap analysis shows precisely where your occupational health and safety management system falls short of the standard and what to prioritise. In every case the aim is the same: arrangements that remain current and robust, preventing danger to staff and the general public within your operational context.

Question 4

Do you investigate electrical accidents and equipment failures?

Accepted Answer

Yes. We provide an independent and structured approach to electrical accident investigations and equipment failure investigations, helping you establish root causes, learn lessons and strengthen your safety management systems and operational practices. Independence matters here: an external investigator with no stake in the outcome can examine events objectively and give findings that stand up to internal and external scrutiny. Our investigators combine that independence with hands-on knowledge of electricity network equipment, including switchgear, transformers, cables, overhead lines and protection systems, so technical evidence is interpreted correctly. Following an investigation we help you act on what was found. That can mean revising electrical safety rules, updating safe systems of work and operational practices, producing electrical safety failure reports, or strengthening asset failure management policies so similar events are less likely to recur. The goal is not simply to explain what happened, but to leave your safety management arrangements demonstrably stronger.

Question 5

Can you help with SF6 gas and insulating oil management?

Accepted Answer

We advise on the management of SF6 gas and insulating oil, helping you put appropriate policies and practices in place for handling, monitoring and managing these materials safely across your electrical assets. Both materials are found throughout electricity networks: SF6 is widely used as an insulating and arc quenching medium in switchgear, while insulating oil is central to the operation of transformers and other plant, so managing them properly matters for safety, for the environment and for the condition of the assets themselves. Our advice sits within our wider electrical safety services and draws on hands-on experience of the equipment involved. We can help you develop the policies, procedures and operational practices your teams need, and align them with your electrical safety rules and safe systems of work. Because we also support asset management and technical documentation, the arrangements we recommend fit into your existing document framework rather than sitting apart from it.

Electrical Safety

Frequently Asked Questions

Other Services

Technical Documentation

Power Systems & Assets Training

Electrical Asset Management & ISO 55001

Electricity Networks Compliance and Innovation

Low Carbon Technology Assessment