Arc Flash Calculator

Type the value of bolted-fault current and working distance into the upper boxes, and select the current-limiting fuse you wish to use for protection from the drop-down box.

The incident energy, PPE category, and Flash Boundary Distance will be automatically calculated as you type.

The calculator is based on 3-phase tests at 600V with an electrode gap of 32mm in a 20"x20"x20" box, as described in the IEEE 1584 standard, with Mersen current-limiting fuses in circuit. A distance exponent of 1.5 is used to adjust the incident energy values for distance.

Use of the IEEE 1584 (2002) set-up only determines the PPE category for protection against the effects of radiated heat, and does not take account of the effects of