IEEE 1584 Arc Flash Calculator

What this IEEE 1584 page actually does

This page is for a narrower and more honest task than a full incident-energy engine. Use it when you already have a published study result or equipment label for the same equipment case and want to review three questions:

• Does the equipment case sit inside the core published IEEE 1584 scope of 208 V to 15 kV three-phase AC equipment?
• If the study already published incident energy at one working distance, what does a simple inverse-square screen look like at a different task distance?
• Is the reviewed task position inside or outside the published arc flash boundary from that same study case?

Inputs this page expects

• System type and nominal voltage for the equipment case you are reviewing
• Published study incident energy from the same study case or equipment label
• Study working distance tied to that published incident-energy result
• Target working distance for the new task review
• Published arc flash boundary from the same study case

Screen used on this page

Screened incident energy = published study incident energy x (study working distance / target working distance)^2

That distance screen is useful only when the reviewed task still belongs to the same equipment case and the published study basis has not changed. It is not a substitute for recalculating incident energy from fault current, protective-device clearing time, enclosure dimensions, gap, or electrode configuration.

Important scope limits

The IEEE Standards Association overview for IEEE 1584 describes the standard as a method that predicts incident energy and arc flash boundary. The same overview also states that IEEE 1584 does not include short-circuit calculations, protective-device coordination, or recommendations for PPE.

NFPA 70E then applies the protection program: the arc flash boundary is tied to 1.2 cal/cm2, and body protection inside that boundary must have an arc rating not less than the estimated incident energy. This page therefore shows a minimum arc-rating screen, not a PPE category assignment.

Use the Short Circuit Calculator when the real question is available fault current. Use the Protection Coordination Calculator when the real question is clearing time or device selectivity. Use a project study when you need fresh IEEE 1584 incident-energy calculations or equipment labels.