| std.ieee-1584.approved | The IEEE-SA Standards Board approved the 2018 edition of IEEE 1584 on 2018-09-27. Value: 2018. |
| std.ieee-1584.definition.arc-flash-boundary | Clause 3.1 of IEEE 1584-2018 defines the arc-flash boundary as the distance from the arc source at which the calculated incident energy falls to the threshold value the definition states. |
| std.ieee-1584.definition.clearing-time | Clause 3.1 of IEEE 1584-2018 treats clearing time as the arc duration, and its first note describes what that time comprises for fuses, for circuit breakers with integral trip units and for separately relayed circuit breakers; a second note points to clause 6.9.1 for the cases in which the arc duration differs from the clearing time. |
| std.ieee-1584.definition.electrode-configuration | Clause 3.1 of IEEE 1584-2018 defines the term electrode configuration and names the five configurations, abbreviated VCB, VCBB, HCB, VOA and HOA, that the model distinguishes. |
| std.ieee-1584.definition.incident-energy | Clause 3.1 of IEEE 1584-2018 defines incident energy as the thermal energy per unit area received at the working distance, expressed in either of the two energy-per-area units the guide uses. |
| std.ieee-1584.definition.working-distance | Clause 3.1 of IEEE 1584-2018 defines the working distance as the distance between the arc source and the face and chest of the worker, the point at which the incident energy is stated. |
| std.ieee-1584.designation | IEEE 1584-2018 is the designation of the document titled IEEE Guide for Performing Arc-Flash Hazard Calculations, printed as IEEE Std 1584-2018 on its cover. Value: IEEE 1584-2018. |
| std.ieee-1584.errata | An IEEE errata correction sheet for IEEE 1584-2018, issued in August 2019, corrected one gap entry in Table F.1 of Annex F, the voltage wording of clause G.6 together with a figure parenthetical in Annex G, and the fuse class and rating labels in several Annex H figure captions. All of the corrections fall in informative annexes, and the first printing and the corrected second printing agree in every normative clause, equation and coefficient. Value: 2018. |
| std.ieee-1584.guide-status | IEEE 1584-2018 is a guide: by its clause 6.12 nothing in it is a mandatory requirement, alternative methods are not excluded, and the guide itself supplies no acceptance limit for equipment. The same clause cautions that a calculated result can be above or below the actual value, that the method presumes equipment that is installed, operated and maintained as its codes, standards and manufacturer instructions direct and that is applied inside its ratings, and that blast, pressure, projectiles, light and sound fall outside the method. |
| std.ieee-1584.normative-references | Clause 2 of IEEE 1584-2018 lists as normative references IEEE 1584.1, on the scope and deliverables of an arc-flash study, IEEE 551, on short-circuit calculation, IEEE 242, on protection and coordination, and IEEE C37.010, on the application of high-voltage circuit breakers. |
| std.ieee-1584.printing.second | The second printing of IEEE 1584-2018, dated 2019-08-30, states on its copyright page that the guide was updated in line with the errata correction sheet, so the corrections are applied in its body. The first printing had been published on 2018-11-30. Value: 2018. |
| std.ieee-1584.revision-of | IEEE 1584-2018 is a revision of IEEE 1584-2002, which had been amended by IEEE 1584a-2004 and IEEE 1584b-2011. Value: 2018. |
| std.ieee-1584.scope | IEEE 1584-2018 provides models and an analytical process for calculating, at equipment and conductors on three-phase alternating-current systems across the voltage range stated in clause 1.1, the predicted incident thermal energy and, from it, the arc-flash boundary; the process includes the collection of field data, the choice of operating scenarios and the calculation parameters. Single-phase alternating-current systems, direct-current systems and the selection of personal protective equipment are outside its scope. |
| std.ieee-1584.sponsor | The body that developed IEEE 1584-2018 is the Petroleum and Chemical Industry Committee, which belongs to the IEEE Industry Applications Society. |
| std.ieee-1584.structure.analysis-process | Clause 6 of IEEE 1584-2018 describes the arc-flash hazard analysis as a stepwise process that runs from data collection through operating-mode selection, bolted fault current, equipment gap and enclosure, working distance, arcing current, arc duration and the treatment of multiple locations and sources to the final incident energy and arc-flash boundary at each location. |
| std.ieee-1584.structure.annex-f-and-g | Annex F of IEEE 1584-2018 summarizes in Table F.1 the laboratory test series behind the model by open-circuit voltage, current, gap and enclosure, and Annex G explains how the model was developed from those tests and how the applicability range of clause 4.2 was decided. |
| std.ieee-1584.structure.arc-duration | Clause 6.9.1 of IEEE 1584-2018 takes the arc duration to run until the last energizing source stops feeding the arc. Ground-fault relays normally receive no credit, definite-time devices such as differential, optical arc-flash and pressure relays are credited at their operating time, every intervening delay counts, and where a time-current curve shows a band the reading is the longest time on the band at the calculated current, taken at both the arcing current and the reduced arcing current. |
| std.ieee-1584.structure.arcing-current-variation | Clause 4.5 of IEEE 1584-2018 derives a reduced arcing current from the calculated arcing current by a variation factor, so that a protective device is evaluated at a lower-bound current that may fall in a slower part of its time-current curve; the arc duration is then determined again at the reduced current, and whichever pass gives the worse result is kept. |
| std.ieee-1584.structure.breaker-clearing | Clause 6.9.3 of IEEE 1584-2018 notes that a low-voltage circuit breaker manufacturer's time-current curve normally includes both the trip and the clearing time, that a curve published for a retrofit trip unit may show trip-unit time only and then needs the breaker operating time added, and that for a current-limiting breaker operating above its current-limiting threshold the manufacturer's recommendation is followed. Clause 6.9.4 builds the clearing time of a relay-operated circuit breaker from the relay operating time, the breaker interrupting time of opening plus arcing, and any lockout relay and tolerance delays, pointing to IEEE C37.010-2016 and IEEE 551-2006 for the breaker and system quantities. |
| std.ieee-1584.structure.data-collection | Clause 6.2 of IEEE 1584-2018 covers the collection of study data, which can be about half of the study effort: current single-line diagrams, utility fault data, equipment nameplates, enclosure sizes and electrode configurations, conductor data and protective device data, with field verification of the installed fuses and settings even for a new facility; it names the companion guide IEEE 1584.1 for the full data list. |
| std.ieee-1584.structure.enclosure-correction | Clause 4.8 of IEEE 1584-2018 supplies the enclosure size correction factor: clause 4.8.2 distinguishes a shallow enclosure from a typical one by voltage and dimension criteria, clause 4.8.3 converts the actual height and width to equivalent dimensions, and Table 7 provides the correction coefficients by box type and electrode configuration for the equations of clause 4.8.4. |
| std.ieee-1584.structure.equipment-defaults | Table 8 in clause 6.5 of IEEE 1584-2018 supplies typical bus gaps and enclosure dimensions by equipment class, taken from the laboratory setups rather than from equipment surveys, and Table 9 in clause 6.6 uses illustrations to assign each conductor arrangement one of the five electrode configurations, with Annex C giving worked choices for common equipment. |
| std.ieee-1584.structure.exposure-duration-consideration | Where the total clearing time is long, clause 6.9.1 of IEEE 1584-2018 asks for a judgment of how long a person is likely to remain exposed, noting that someone working from a bucket truck or reaching inside an enclosure may take longer to get clear; the clause frames this as a consideration requiring engineering judgment, not as a cap on the arc duration. |
| std.ieee-1584.structure.fuse-clearing | Clause 6.9.2 of IEEE 1584-2018 gives the rule for reading a fuse time-current curve for the arc duration, distinguishing curves that give total clearing time from curves that give only average melting time and deferring to the manufacturer above the current-limiting threshold; Annex H adds a simplified incident energy model for two fuse classes at the lowest anchor voltage and one electrode configuration, with Table H.9 supplying its constants. |
| std.ieee-1584.structure.model | Clause 4.3 of IEEE 1584-2018 sets out the model as two voltage bands and a sequence of steps: the arcing current, the arc duration that the protective device gives at that current, the incident energy with the enclosure size correction, the arc-flash boundary, and a repeat of the energy and boundary steps at the reduced arcing current of clause 4.5 with the higher result reported. |
| std.ieee-1584.structure.model-range | Clause 4.2 of IEEE 1584-2018 states the range of system voltage, frequency, bolted fault current, conductor gap, working distance, clearing time, enclosure size and electrode configuration inside which its incident energy model applies, and it names no alternative method for conditions outside that range. |
| std.ieee-1584.structure.multiple-locations-and-sources | Clause 6.10 of IEEE 1584-2018 treats the line side, the bus and the load side of devices in different compartments of one piece of equipment as separate arcing locations, each calculated with the worst kept; an integral main device earns credit only where it is adequately isolated from the bus, and motor contribution enters both the device operating time and the total arcing current. For a location fed from more than one source, illustrated by the dual-fed motor control center of Figure 1, each source device is operated in sequence and the arcing current is redistributed after every operation. |
| std.ieee-1584.structure.operating-modes | Clauses 6.3 and 6.4 of IEEE 1584-2018 call for the study to run every operating mode that produces either the maximum or the minimum available short-circuit current and to keep the highest incident energy and boundary at each location, resting on an up-to-date short-circuit study, because both a larger and a smaller fault current can raise the incident energy. |
| std.ieee-1584.structure.single-phase-and-dc | Clauses 4.11 and 4.12 of IEEE 1584-2018 state that single-phase alternating-current and direct-current arcs are not covered by the model; for single-phase systems the guide suggests a conservative use of the three-phase equations, and for direct current it points to published papers in its bibliography. |
| std.ieee-1584.structure.working-distance-defaults | Table 10 in clause 6.7 of IEEE 1584-2018 supplies default working distances by equipment class; protection under the clause is judged by the energy reaching the head and torso at that distance rather than the hands, and a different distance may be used for a given task. |
| std.ieee-1584.title | The title page of IEEE 1584-2018 gives its full title as IEEE Guide for Performing Arc-Flash Hazard Calculations. Value: IEEE Guide for Performing Arc-Flash Hazard Calculations. |
