Method 1: Using Incident Energy Tables Step 1: Determine the Incident Energy (IE)

Use NFPA 70E or IEEE 1584 tables to find the incident energy value for the equipment (e.g., switchgear, panelboard) and operating voltage.

Step 2: Calculate Arc Flash Calories

Multiply the Incident Energy by the exposed skin area (typically 1 ft² or 0.09 m²) to obtain the arc flash calories.

Formula: Arc Flash Calories = Incident Energy (cal/cm²) x Exposed Skin Area (ft² or m²)Method 2: Using Arc Flash Calculation Software Use specialized software (e.g., EasyPower, SKM PowerTools) that incorporates the required calculations and databases. Step 1: Input Equipment and System Parameters

Enter the equipment parameters (e.g., voltage, current, type), system impedance, and geometry.

Step 2: Calculate Incident Energy and Arc Flash Calories

The software performs the calculations and estimates the arc flash calories based on the input parameters.

Other Considerations



Exposed Skin Area

The amount of exposed skin area affects the severity of arc flash burns. Use clothing and PPE to minimize exposure.

Duration of Exposure

Exposure time is crucial. The longer the exposure, the higher the likelihood of severe burns.

Arc Flash Hazard Levels

Classify the hazard level based on the calculated arc flash calories using NFPA 70E guidelines to determine appropriate PPE and safety measures.*

Protective Equipment: Use approved personal protective equipment (PPE) rated for the calculated arc flash hazard level. This includes arc flash suits, gloves, face shields, and hearing protection. Flag for review