NECA INCIDENT ENERGY CALCULATOR

Prospective Three Phase Bolted Fault Current (Irms) in amps
Insert propsective three phase symmetrical bolted fault current in this box.
Note - Arcing current is assumed to be 30% of the bolted short-circuit fault current.
Fault Clearance Time (t) in seconds
Refer to upstream protection device time current-curves
Default Fault Clearance Time = 0.1 seconds
Distance (r) in metres
The distance of the individual from the arc source.
Default nominal distance = 0.45m
Calculated Incident Energy (IE) in calories/cm2 for COPPER
Calculated Incident Energy (IE) in calories/cm2 for ALUMINIUM
Minimum Arc Flash Protection value
NENS 09-2014 Requires that base garments be manufactured from arc rated materials should be worn where there is a possibility of exposure to incident energy of 1.2 calories/cm2 or above