Beatrice Lang
Electrical hazard (EH) rated shoes are designed to protect the wearer from certain types of electric shocks or electrocution. They are insulating, meaning they have high electrical resistance and prevent electrical current from travelling through the body. EH-rated shoes are tested by the American Society for Testing and Materials (ASTM) and must meet specific standards, such as withstanding high voltages under dry conditions. While they provide protection, EH-rated shoes are not meant to be the primary safety precaution and are not suitable for live electrical work.
| Characteristics | Values |
|---|---|
| Purpose | Protection from electric shocks or electrocution |
| Protection | Secondary source of protection |
| Use cases | Not suitable for carrying out live electrical work |
| Use cases | Recommended for dry use only |
| Use cases | Not suitable for environments with high incident energy |
| Use cases | Not suitable for environments with arc flash hazards |
| Use cases | Not suitable for environments with wet conditions |
| Use cases | Not suitable for environments with electric wires in concrete |
| Testing body | American Society of Testing and Materials (ASTM) |
| Testing requirements | Withstand 14,000 volts at 60 hertz for one minute with no current flow or leakage current of more than 3 milliamps under dry conditions |
| Testing requirements | Withstand 18,000 volts of electricity at 60 hertz for a whole minute without leakage of more than one milliampere under dry conditions |
| Protection | Significantly impede the flow of electricity through the shoe and into the ground |
| Protection | Thickly insulated soles that inhibit the flow of electricity |
| Protection | Electrically isolating outsoles |
| Protection | High electrical resistance |
| Protection | Non-conductive materials |
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What You'll Learn
EH-rated shoes are tested by the American Society of Testing and Materials
Electrical Hazard (EH)-rated shoes are designed to protect the wearer from electrical hazards, specifically electrocution. EH-rated shoes are insulating, meaning they have a high electrical resistance that completely isolates the wearer from the ground. This is in contrast to other safety shoes, such as ESD and anti-static shoes, which are conductive and allow a certain amount of electrostatic energy to travel through the body before diverting it to the ground.
To meet the ASTM standard for electrical hazard protection, EH-rated shoes must significantly impede the flow of electricity through the shoe and into the ground. This is typically achieved through thickly insulated soles that inhibit the flow of electricity. EH-rated shoes are designed to protect wearers from up to 600 volts in a dry setting, as they are recommended for dry use only. It is important to note that EH-rated shoes are not meant to be the primary safety precaution for electricity and are not suitable for all electrical situations.
In addition to the ASTM F2412 standard, safety boots should also meet the ASTM F2413 standard, which covers additional safety requirements such as metatarsal and electrical hazard protection. Composite toe caps, made from materials like plastic, Kevlar, carbon fibre, or fibreglass, can help meet these standards while offering advantages over traditional steel toe caps, such as being lighter weight and non-metallic. It is important to choose safety boots that not only meet the relevant ASTM standards but also fit well and are comfortable to wear, as ill-fitting shoes can lead to foot injuries and discomfort.
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They protect against electrocution and electric shocks
Electrical hazard-rated shoes or boots are designed to protect against electrocution and electric shocks. They are meant to be used as a secondary precaution against electricity, with the primary precaution being personal protective equipment (PPE). The American Society of Testing and Materials (ASTM) tests and designates these safety shoes, which are labelled as EH-rated. The EH rating indicates that the shoes significantly impede the flow of electricity through them and into the ground, thus reducing the risk of electrocution. Thick insulation in the soles of EH-rated shoes inhibits the flow of electricity.
These safety shoes are designed to protect the wearer from up to 600 volts in a dry setting. Occupations that require working with live wires or potential exposure to electricity include electricians, linesmen, industrial engineers, maintenance workers, and construction workers. For such workers, the Occupational Health and Safety Administration mandates the use of safety shoes.
It is important to note that EH-rated shoes are not recommended for all electrical situations. They are intended for dry conditions, as opposed to dielectric shoes, which are designed for use in wet conditions and tested at high voltages. Additionally, EH-rated footwear differs from static dissipation footwear and electrically conductive shoes, which are designed to eliminate the risk of static shock by conducting electricity through the shoe.
To further protect against electric shocks and electrocution, circuit protection devices such as fuses, circuit breakers, ground-fault circuit interrupters (GFCIs), and arc-fault circuit interrupters are employed. GFCIs are commonly used in wet locations, construction sites, and other high-risk areas to prevent electrocution by interrupting the flow of electricity. Personal protective equipment, such as rubber insulating gloves, hoods, sleeves, matting, blankets, and protective helmets, is also crucial for workers who deal directly with electricity.
Training is essential for employees who may encounter electrical hazards. They need to be able to recognise the hazards and understand safe work practices and protective measures implemented by their employer. Electric shocks can cause a range of effects, from a slight tingling sensation to cardiac arrest, depending on factors such as the magnitude of the current, the path through the body, and the duration of the current flow.
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They are insulating and have high electrical resistance
Electrical hazard (EH) rated shoes are insulating and have high electrical resistance. This means that they are designed to protect the wearer from electric shocks or electrocution. EH-rated shoes are not a primary safety precaution and do not guarantee full protection from electrocution. However, they significantly impede the flow of electricity through the shoe and into the ground, reducing the risk of electrocution.
The soles of EH-rated shoes are made from non-conductive materials, which means that electrical charges do not pass through the body. The shoes form a solid barrier between the wearer and the floor, providing isolation from the ground. This is in contrast to anti-static and electrostatic dissipative (ESD) shoes, which are conductive and allow a certain amount of electrostatic energy to travel through the body before diverting it to the ground.
ESD shoes have an electrical resistance between 0.1 and 100 MΩ, while anti-static shoes have a range of 0.1 to 1000 MΩ. EH-rated shoes, on the other hand, must be able to withstand much higher voltages. According to ASTM testing requirements, EH-rated shoes must withstand the application of 14,000 volts at 60 hertz for one minute with no current flow or leakage current of more than 3 milliamps under dry conditions. Some sources state that EH-rated shoes can protect the wearer from up to 18,000 volts or 600 volts in a dry setting.
It is important to note that EH-rated shoes are not suitable for all electrical situations and should not be the only safety precaution. They are recommended for dry use only and are not meant for live electrical work. Employers should determine whether their employees require anti-static, ESD, or EH-rated footwear based on the specific hazards and equipment in the work setting.
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They are not suitable for live electrical work
Electrical Hazard (EH) rated shoes are designed to protect against electrocution and electric shocks. They are insulating, meaning they have high electrical resistance and prevent electrical current from travelling through the body. However, it's important to note that EH-rated shoes are not suitable for live electrical work. Here's why:
Firstly, EH-rated shoes are not intended to be the primary safety precaution for electricity. They are meant to provide a secondary source of protection from certain types of electric shocks or electrocution. While they can significantly impede the flow of electricity, they are not guaranteed to fully protect against electrocution, especially in live electrical work where the risks are much higher.
Secondly, EH-rated shoes are typically tested for dry settings only. The ASTM (American Society for Testing and Materials) standards require EH-rated shoes to withstand high voltages under dry conditions. However, in live electrical work, there may be exposure to wet conditions, which could affect the effectiveness of the shoes' protection.
Additionally, EH-rated shoes focus on the sole and heel of the footwear. They are designed to prevent electrical charges from passing through the body by isolating the wearer from the ground. However, in live electrical work, there may be direct contact with live wires or electrical equipment, which EH-rated shoes alone cannot protect against.
Moreover, the effectiveness of EH-rated shoes depends on the specific work environment and the types of electrical hazards present. Employers or specialists should assess the workplace hazards and determine the appropriate safety measures, including the type of footwear required. In some cases, other types of safety footwear, such as dielectric boots or static dissipation footwear, may be more suitable for live electrical work.
Finally, it's crucial to follow safety regulations and guidelines provided by recognised organisations. The Occupational Health and Safety Administration (OHSA) requires individuals working with live wires and electricity to wear appropriate safety gear, which may include specific types of footwear beyond EH-rated shoes. It's important to consult official sources and experts to ensure the correct safety precautions are being taken for live electrical work.
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They are different from anti-static and ESD shoes
Electrical hazard (EH) rated shoes are footwear that have been tested by the American Society of Testing and Materials for their protection against electrocution. EH-rated shoes are designed to protect the wearer from electrical currents of up to 600 volts in a dry setting. They do this by impeding the flow of electricity through the shoe and into the ground, reducing the likelihood of electrocution.
They are different from anti-static and ESD (electrostatic dissipative) shoes. Anti-static and ESD shoes are conductive, meaning they allow a certain amount of electrostatic energy to travel through the body before diverting it to the ground. In contrast, EH shoes are insulating, meaning they have a high electrical resistance that completely isolates the wearer from the ground. EH shoes form a solid barrier between the wearer and the floor, preventing electrical current from travelling through the body. While anti-static and ESD shoes divert electrical current to the ground, EH shoes are designed to completely block the current.
Anti-static and ESD shoes are designed to protect against electrostatic discharges, which are discharges of static energy from one body to another. These discharges can have high values but typically do not exceed 5,000 volts. Even small discharges can pose risks in certain workplaces, such as causing fires when working with flammable liquids or gases, or damaging sensitive electrical components. As a result, anti-static and ESD shoes are commonly used in the production and assembly of devices such as microchips or electronic boards.
To maintain the antistatic properties of ESD shoes, it is important to follow certain maintenance guidelines, such as thoroughly cleaning the shoes and storing them in a heated environment when not in use. The temperature sensitivity of ESD shoes should also be considered, as electrical resistance increases in colder environments, reducing the shoes' dissipative capacity. Additionally, the materials worn with ESD shoes, such as socks, can impact their dissipative properties.
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Frequently asked questions
Electrical hazard (EH) rated footwear is designed to protect the wearer from certain types of electric shocks or electrocution. EH-rated footwear is insulating, meaning it has a high electrical resistance that isolates the wearer from the ground.
EH-rated footwear is made from non-conductive materials that prevent electrical charges from passing through the body. The soles of EH shoes are electrically isolating, which means they significantly impede the flow of electricity through the shoe and into the ground.
The American Society for Testing and Materials (ASTM) requires EH-rated footwear to withstand the application of 14,000 volts at 60 hertz for one minute with no current flow or leakage current of more than 3 milliamps under dry conditions.
EH-rated footwear is specifically designed to protect against electric hazards, while other types of safety footwear, such as anti-static and ESD (Electro Static Dissipative) shoes, are designed to prevent static shocks. EH-rated footwear should also not be confused with dielectric shoes, which are tested to high voltages and can be used in wet conditions, while EH-rated footwear is recommended for dry use only.
The Occupational Health and Safety Administration requires individuals who work around live wires and potential electrical hazards to wear EH-rated safety shoes. This includes electricians, linesmen, industrial engineers, maintenance workers, construction workers, and other professions.
