Choosing CPE and PPE for Live Line Working such as gloves, sleeves, covers, mats and rubber blankets may seem simple at first glance. In general, all that is considered is the insulation class, the appropriate size and compliance with technical standards. However, anyone who works directly in the maintenance of energized distribution networks knows that these basic criteria, although necessary, do not alone guarantee the real safety of operation or manoeuvre in the field.
What to consider when choosing PPE for Live Line Working
In the field, where electrical risks are constant, technical details overlooked at the time of purchase can lead to accidents, discomfort, unproductivity and even workers refusing to use PPE or CPE. That’s why, in addition to formal certification, it’s essential to adopt a more thorough assessment.
Inadequate size compromises operations
One of the most common mistakes when buying insulating gloves is choosing the wrong size. When rubber gloves are tight, they limit hand mobility, hinder precision movements, constrict blood circulation and accelerate fatigue. Likewise, when they are loose, they slip easily and compromise control of the tools, increasing the risk in activities that require precision and mastery.
Proper selection should not be based on tables alone. The purchaser must carry out prior tests, considering the combined use with the mechanical protection glove, exactly as it will occur in the real working environment. This precaution prevents operational failures and contributes to comfort and safety when working on energized distribution networks. Another important recommendation is to meet with the users themselves to listen to their needs. It is also worth enlisting the support of a specialized technical consultant, who can guide the choice according to the application and the requirements of the service.
The impact of the weight on Live Line equipment
Another aspect that is often overlooked is the weight of the equipment. Insulating gloves, blankets and mats with good dielectric capacity, but which are too heavy, cause physical strain on linemen. This compromises performance, increases fatigue and can lead to rejection.
This impact is even more critical in Live Line maintenance, where precision and agility are essential. Heavy equipment makes it difficult to handle tools and increases the risk of operational failures. The best choice balances safety, strength and ergonomics. In general, evaluating the weight of the material based on its practical use is fundamental to guaranteeing the team’s adherence to the continuous use of PPE and CPE.
Adherence, malleability and resistance
In practical use, the performance of the equipment goes beyond the voltage withstood in an electrical test. Adherence, malleability and resistance to external agents are crucial factors for safety and reliability during Live Line Working. Rubber that is too rigid or slippery compromises precise handling, especially when using hot sticks or other tools. In the case of insulating blankets, this is even more sensitive: if they don’t fit snugly to the surface, they can move during the activity and create a risk.
In addition to these physical characteristics, it is essential to observe three specific resistances:
- Ozone resistance: essential for PPE used outdoors, as is the case with most Live Line activities, preventing cracks and premature ageing of rubber exposed to the environment;
- Resistance to the spread of flames: ensures that, in the event of an electric arc or accidental short, the material does not act as a fire vector;
- Resistance to chemical agents: although contact should be avoided, it is important that the material withstands any accidental contamination by oils, greases or solvents common in substations.
Even if the product complies with the standards, a lack of performance in these aspects can compromise safety and drastically reduce the useful life of CPE and PPE for Live Line.
Compliance with standards and quality of tests
Manufacturers must produce and test protective equipment in accordance with specific technical standards, guaranteeing the minimum dielectric properties required for safe use in energized networks. These include:
- ASTM D120 – specifies manufacturing requirements for rubber insulating gloves;
- ASTM D1051 – defines the manufacturing and testing requirements for rubber insulating sleeves;
- ASTM D1048 – This specification covers the testing of insulating rubber blankets used for the personal protection of workers against accidental contact;
- ASTM D178 – This specification covers the testing of insulating rubber mats used as floor coverings for the personal protection of workers.
- NR-6 – Personal Protective Equipment (Brazil/MTE): establishes legal requirements for PPE in Brazil, including the obligation to have a valid CA (Certificate of Approval).
However, it is not enough to rely solely on certificates and technical reports. Good management of Live Line PPE requires:
- Verification of the report’s conformity, with an accredited laboratory and a recent date;
- Mandatory periodic tests, in accordance with company standards and policies;
- Thorough visual inspection before and after each use to identify cracks, permanent folds, bubbles, tears or contamination;
- Checking the date of manufacture and technical validity of the material, especially if stored for long periods;
- Logistical care in storage and transportation, ensuring that equipment is not damaged during handling, movement or storage.
The absence of visible damage does not mean that the equipment is in a safe condition. Therefore, combining electrical testing, regulatory compliance and visual inspection is the safest way to protect the worker and the system.
Organization and care of Live Line PPE
Even with correct specifications and tests, users can compromise the effectiveness of equipment if they don’t maintain it properly. Physical damage, contamination and deformation caused by routine carelessness can compromise insulation capacity, even in new, standard-compliant materials.
For safe and effective cleaning:
- Use only water and neutral soap or the degreasers indicated. Always follow the manufacturer’s instructions regarding the frequency and method of cleaning;
- Completely avoid the use of chemical solvents or abrasives, which degrade the rubber;
- Use soft, lint-free cloths to avoid residue that could interfere with the insulation.
For proper storage:
- Keep insulating equipment away from sharp edges, metal surfaces and pointed objects;
- Wrap the insulating blankets instead of folding them, and avoid subjecting them to prolonged compression to preserve their integrity.
Small precautions like these make a real difference to the durability and safety of live line equipment. For a more complete guide, see: Live Line Organization and Cleaning
What we see in practice
Based on our experience in the field and training conducted by CTST in different companies and countries, we often receive reports of difficulties with rubber insulating gloves. Although they comply with the standards, many are unpleasant to wear on a daily basis. Some are too thick or have a very slippery finish, compromising tool mastery and increasing the risk of accidents, especially in more precise tasks.
Another recurring issue is the insulating blankets, which are sometimes supplied in such thick, rigid or heavy versions that they are difficult to adjust properly to the structures of the electrical system. This makes it difficult to position them securely and increases the effort involved in fixing them. In Live Line activities, where time, stability and firmness are of the essence, this factor becomes critical.
There have also been reports of insulating rubber sleeves being uncomfortable or poorly fitting when used in conjunction with the mechanical protection glove, which affects the ergonomics and mobility of the operator.
These points don’t usually appear in catalogs or technical manuals, but they make all the difference in real-life use. That’s why the practical experience of the teams should be valued as part of the decision-making process when buying Live Line PPE.
Technical criteria as the first step towards safety
In short, safety when working with energized networks goes beyond the skill of the lineman or the existence of procedures. It starts with the technical choice of rubber insulating equipment. Gloves, covers, blankets, sleeves and insulating mats need to fulfill their function not only in regulatory terms, but also in terms of practical performance, comfort, durability and compatibility with actual use.
It is the buyer’s role to evaluate beyond compliance. This includes checking the reliability of tests, the material’s resistance to use in the field, the supplier’s reputation and the history of application among technical teams. As such, the person responsible should consult experienced professionals, ask for operational feedback and consider the environment in which the PPE will be used. These are actions that make all the difference.
Based on this field experience, CTST reinforces that protecting the lineman, the circuit and the company requires verifiable criteria at all stages, in accordance with applicable standards, with an inspection plan, records and traceability. In partnership with ORION, we ensure that the specification and purchase of insulating PPE for Live Line meets technical requirements, as well as receiving controls and customer support.
In this way, each purchase is no longer a one-off, but instead supports operational integrity and ongoing security. Investing responsibly is investing in proven quality. Contact us and find out more!
