Choosing the right safety footwear is critical in industrial and electrical work environments. Two common types are Electrical Hazard (EH) and Static Dissipative (SD) footwear. While both offer protection, they serve opposite purposes. Understanding the difference between EH and SD footwear can prevent serious injuries and equipment damage.

Electrical Hazard (EH) footwear is designed to protect the wearer from electric shock when accidentally stepping on live electrical circuits. These shoes use insulating materials, such as rubber or non-conductive polymers, in the outsole and heel. The primary function is to provide a secondary source of protection, reducing the risk of current passing from the ground through the foot. EH-rated footwear is tested to withstand up to 18,000 volts under dry conditions. This type is ideal for electricians, linemen, and workers near exposed wiring or power sources.

In contrast, Static Dissipative (SD) footwear is designed to safely release static electricity from the body to the ground. These shoes have conductive elements that allow a controlled flow of electrical charges, preventing sudden sparks or electrostatic discharge (ESD). SD footwear typically features a resistance range between 1 megohm and 100 megohms. This controlled conductivity is crucial in industries where static can ignite flammable materials or damage sensitive electronics, such as in chemical plants, munitions factories, or semiconductor cleanrooms.

The key difference lies in their resistance levels. EH footwear has very high resistance to block current, while SD footwear has moderate resistance to drain static. Wearing SD shoes in an electrical hazard environment could be dangerous, as they might allow a path for current flow. Conversely, wearing EH shoes in a static-sensitive environment could allow static to accumulate, increasing the risk of a spark.

When selecting footwear, consider your specific workplace risk. If you work with live circuits or high voltage, choose EH-rated boots with reinforced insulation. If your work involves flammable materials or electronics assembly, opt for SD-rated shoes that dissipate charge safely. Some manufacturers offer dual-rated footwear, but always verify they meet both ANSI and ASTM standards.

Proper maintenance is also vital. EH shoes must be inspected for cuts or punctures that compromise insulation. SD shoes should have clean soles with intact conductive paths. Mud, water, or heavy wear can alter resistance levels. Both types require regular testing to ensure continued compliance with safety standards.

In summary, EH footwear blocks harmful electrical currents from entering the body, while SD footwear prevents dangerous static accumulation. Choosing the wrong type can lead to electrocution or explosions. Always match your footwear to the specific hazard of your job site. Consult with a safety professional to determine the best option for your team, ensuring both personal protection and regulatory compliance.