But then it suggests that we go to Annex B for further information on suggested deliverables. “Results shown are estimates, and may notīe an accurate representation of your actual conditions. arc flash boundary, instant energy, and working distance. Volt arc flash incident energy calculator was incorporated into an. Of NFPA 70E, copyright National Fire Protection Assoc., 2012] 3) Arc gap distance varied between 10mm and 40mm to. [All bracketed references are data & formulas from 'ANNEX D' Overcurrent Protection at Switchboard Disconnect for Motor: Main Switchboard - internal Bus Conductors 'View Page Source' on this page, and you are free to save, copy & redo as you wish.Īnd if you do, please retain the 'footer'.Ĭonductors-only Short Circuit ('S.C.') Current Where I need to change data for the various equipment on site.Įach of these may be modified as desired.Īll results will be re-calculated immediately. arc flash boundary in IEEE 1584 Guide for Performing Arc Flash Hazard Calculations. 'Text Boxes' and 'Radio Buttons' are present, arc flash boundary (AFB) distance at that incident energy. This allows creation & posting of SC/AF labels, for safety of maintenance personnelĪs well as compliance with NFPA 70E (© National Fire Protection Assoc., 2012). Short circuit and arc flash values are calculated at several stages. Main switchgear a feeder to another electrical building Īn OCPD to a motor circuit feeder a motor 'starter', a motor circuit, and a motor. Limited and Restricted Approach boundaries deal with shock and are determined by NFPA 70E Tables 130.4 (C) (a) for AC systems and 130.4 (C) (b) for DC systems, while Arc Flash boundaries are determined through an Arc Flash Analysis or through the use of the use of the Arc Flash PPE Categories in 130.7 (C) (15) (a). Present is: an off-site 3-phase utility supply Ī length of utility / supply conductors to an on-site service transformer Use this convenient arc flash calculator to view a sampling of arc flash hazard calculations and the impact of various system changes on arc flash energy. Short Circuit & Arc Flash Calculator This page is a self-contained HTML document / JavaScript program,ĭesigned to rigorously calculate short circuit &Īrc flash values for a particular industrial facility.Ī single-line diagram appears on the left. Not including the CF would result in higher (more conservative. If the actual enclosure is larger, the CF can be determined and used to calculate a more accurate (and lower) value of incident energy and arc flash boundary. You need to have JavaScript enabled to use this calculator. Without using a CF, the calculations are based on a default size that is normalized to 20 inches by 20 inches by 20 inches.

Arc flash boundary distance calculator