Arc Flash Hazard Reports

This is the ID name of the buses faulted. You can have single or multiple (including all buses) faulted for arc flash analysis. MCC and panel schedules also are presented as buses; this represents the main bus within the MCC or panel.

The area of the electrical system in which the bus is located. This can be used to analyze the system in sections.

The zone in the area of the electrical system in which the bus is located. This can be used to analyze the system in sections.

The voltage of the bus being faulted.

The name of the physical location where the equipment is located.

The X coordinate of the equipment location

The Y coordinate of the equipment location.

The floor on which the equipment is located.

Indicates whether the equipment uses alternating current or direct current.

The line-to-ground voltage of the bus being faulted.

The QR (Quick Response) code for the device, which is available to print on arc flash labels.

When a bus is faulted, EasyPower checks every protective device for the current contribution to the fault. If the current passing through the protective device is significant, then the results corresponding to the trip time of that device are provided in the spreadsheet.

The name of the bus to which the reported upstream device is connected.

If the trip device is a relay, then the relay function ID is provided in this column.

If the trip device is a relay, then the device function name is provided in this column. Examples of device functions are: 51/50, 51N, 50G, 49, and so on.

Describes the type of enclosure specified in the Bus Data. The available types are Switchgear, MCC/Panel, Open Air and Conductor.

The “X” mark in this column indicates if the IEEE equation used the coefficient for solidly grounded systems. This only applies if the standard selected is something other than IEEE 1584-2018.

The zero sequence impedances for cables and busways are typically higher than the positive sequence impedances. Therefore, the line to ground fault currents can be smaller than three phase faults at the end of a long line. When the line to ground fault current is much smaller than the three phase fault current then the system can be considered “not effectively grounded." To determine if the system is effectively grounded, the program first performs a single line to ground fault on A phase. The average per-unit voltage at B and C phases is compared with the threshold specified in the Arc Flash Gnd Vpu field in the Options - System dialog box. If the average per-unit voltage is less than the threshold, the system is considered to be effectively grounded.

The electrode configuration on which the arc flash calculations are based. This takes into account whether the conductors are in an enclosure or in open air, as well as the orientation of the conductors and whether they terminate into an insulated barrier. This comes from the device library or it can be specified by the user in the equipment data.

Electrode configurations are only applicable to the IEEE 1584-2018 standard. See Electrode Configuration for more information.

The height of the enclosure, based on the electrode configuration. This comes from the device library or it can be specified by the user in the equipment data.This is applicable only when the IEEE 1584-2018 standard is used, and is otherwise left blank.

The units displayed are dependent on the Units setting in Tools > Options > System.

The width of the enclosure, based on the electrode configuration. This comes from the device library or it can be specified by the user in the equipment data. This is applicable only when the IEEE 1584-2018 standard is used, and is otherwise left blank.

The units displayed are dependent on the Units setting in Tools > Options > System.

The depth of the enclosure, based on the electrode configuration. This comes from the device library or it can be specified by the user in the equipment data. This is applicable only when the IEEE 1584-2018 standard is used, and is otherwise left blank.

The units displayed are dependent on the Units setting in Tools > Options > System.

Gap between the phase conductors. This comes from the device library or it can be specified by the user in the equipment data. The gap can be specified according to enclosure type and voltage. It is always expressed in millimeters.

The text in this column is blue indicating you can change the values. If you change the value, other calculations in the spreadsheet are automatically updated based on the revised value.

This is the total bolted fault current calculated at the faulted bus.

The text in this column is blue indicating you can change the values. If you change the value, other calculations in the spreadsheet are automatically updated based on the revised value.

This is the total arcing current calculated at the faulted bus.

The bolted fault current flowing through the upstream protective device. When there are multiple sources or motors feeding the fault, this value can be different from the total bolted fault current on the bus. Also, when the trip device is at different voltage than the bus, the values can be different.

The text in this column is blue indicating you can change the values. If you change the value, other calculations in the spreadsheet are automatically updated based on the revised value.

The arcing current flowing through the upstream protective device. When there are multiple sources or motors feeding the fault, this value can be different from the total arc current on the bus. Also, when the trip device is at different voltage than the bus, the values can be different.

Trip time for the protective device at the estimated arc current.

This column reports the upstream device trip time based on the momentary (1/2 cycle) branch current. This is in compliance with NEC (NFPA 70) 2017 version Article 110.16 (B).

Opening time for HV breakers or opening device after the relay trips. This column is applicable only for relays. After the relay trips, the HV breaker takes this amount of time to clear the fault. If the trip device is a fuse or LV breaker instead of a relay, the trip time already includes the opening time so this column will be blank. There are some exceptions that apply to this. Some relays already include the breaker opening time in their trip curves. These are referred to as SST Relays. Examples are: Cutler-Hammer Digitrip 1150V, Digitrip MCV, and so on.

In the Relay Data dialog, you can specify which breaker, fuse or switch is opened when the relay trips. The opening time from the dialog of the switching device is used. If the ID name of the switching device is not specified, the opening time of the breaker right next to the relay is used. If there are no immediate switching devices, the program will traverse upstream to find the first switching device.

Total duration of arc fault. This is the sum of Trip Time and Opening Time.

If an Aux Time is specified in the relay dialog, the Arc Time includes Aux Time, Trip Time, and Opening Time.

The text in this column is blue indicating you can change the values. If you change the value, other calculations in the spreadsheet are automatically updated based on the revised value.

The sum of the Trip Time (branch bolted fault) and the Opening Time.

The arc flash boundary distance in specified units. Units are specified in Short Circuit Options on the Arc Flash Hazards tab.

Shock protection boundary based on equipment voltage according to NFPA 70E. Unqualified persons are not permitted to approach nearer than this distance.

Shock protection boundary based on equipment voltage according to NFPA 70E. When equipment is energized, qualified persons are not permitted to approach or take any conductor or circuit parts closer than the restricted approach boundary. Refer to NFPA 70E for exceptions.

When you first open the Arc Flash Hazard Report window, only the first working distance appears in the spreadsheet. To view results for other working distances, click .

Approximate working distance in specified units. You can specify up to five different working distances in Short Circuit Options. The program calculates incident energy for each working distance.

This is the incident energy from arc flash corresponding to the trip device. The trip time associated with the trip device is used in the calculation. However, the arc current or fault current used is the total fault current on the faulted bus and not the current seen by the trip device. The rating of personal protective equipment (PPE) worn by workers should be based on this value.

The energy is reported in calories or joules per square centimeter based on settings in Short Circuit Options.

This displays the PPE level text based on the levels and text defined in the PPE Levels section of the device library.

This displays the PPE clothing description based on the levels and description defined in the PPE Levels section of the device library.

Comments generated by EasyPower–for example, "No Valid Trip Device Found Upstream or in Bus Dialog." or "Do not Work on Energized Equipment."

If EasyPower is set to display the PPE level, this column is named PPE Level and it displays the PPE level.

Note: This dual-purpose column was retained for backwards compatibility with earlier custom report configurations, but has been replaced with the separate PPE Level and Equipment Comments columns. It is no longer part of the default report configuration.

Comments generated by EasyPower–for example, "No Valid Trip Device Found Upstream or in Bus Dialog," "Do not Work on Energized Equipment," or "Out of IEEE 1584-2018 Range." See IEEE 1584-2018 Range of Model for more information on that message.

The arc flash label comment. This is defined on the Arc Flash Hazard tab of the equipment dialog box, but can be changed here, if needed.

The number of arc flash labels to print. This is defined on the Arc Flash Hazard tab of the equipment dialog box, but can be changed here, if needed.

Note: See also Device Label Quantity below.

When the Detailed output option is selected, feeder arc flash results are displayed along with bus and incomer results. Each row of the result can have its own user-specified comments. These comments are associated with the protective devices. The comments can be entered only through the arc flash hazard report. The comments are stored with the file.

Note: The Detailed output option is set in Short Circuit Options > Arc Flash Hazard.

This is the number of labels to print for each row that is created when the output option is set to Detailed. For this count to be used, the Equipment Label Quantity value must be 0.

Note: The Detailed output option is set in Short Circuit Options > Arc Flash Hazard.