Panel Edit

Allows you to view and edit the information on electrical equipment in your project. Opens the following dialog box:

Panel Edit

electrical-equipment-calculation-information

Electrical Equipment Tree: The tree on the left side of the dialog box lists all of the electrical equipment in your project. The equipment is organized based upon the connections in the model.

Calculate: Press this button to run the Calculate command.

Circuit Edit: Press this button to close this dialog box and run the Circuit Edit command. The currently selected electrical equipment will be selected in the Circuit Edit dialog box.

Swap Feeders: This button appears when you select a piece of electrical equipment with two feeders. The two feeders are arbitrarily assigned to be feeder 1 or feeder 2. Feeder 1 is considered the main feeder for the equipment and should lead back to the utility. Feeder 2 should be used for the emergency or bypass feeder. Press this button to change which feeder is assigned which number.

Definition

Device Name: The name of the electrical equipment. This is the same value as the Panel Name parameter. Changing the Device Name in this dialog box will also change the Panel Name. It will also update the name of the panel schedule associated with this electrical equipment.

Description in Upstream Equipment: The description for the electrical equipment that will appear in the circuit description of the upstream panel schedule.

Default: The description in the upstream panel schedule will be the same as the device name.
Custom: Enter a custom description in the lower field.

Primary Voltage: The primary voltage of the electrical equipment. This is the same value as the Distribution System parameter. Use the standard Revit MEP interface to change this value.

Secondary Voltage: The secondary voltage of the electrical equipment if it is a transformer. This is the same value as the Secondary Distribution System parameter. Use the standard Revit MEP interface to change this value.

This field is only displayed for transformers.

Connected Load: The total connected load on the electrical equipment. These fields are the same values as the Total Connected and Total Connected Current parameters.

Calculated Load: The total calculated demand load on the electrical equipment. These fields are the same values as the Total Estimated Demand and Total Estimated Demand Current parameters.

Mains / Bus Amps: The size of the bus. This field is the same value as the Mains parameter that can be set in the Electrical - Circuiting section of the Properties panel for electrical equipment.

Specific ampacity: The mains value is set to the specific size chosen from the list.
Custom: Enter a custom mains value in the lower field.

This field is only displayed for panels and switchboards.

This value can be set in the family definition using the Family Edit command. If it is, the value cannot be changed in the instance in the project.

Main Disconnect Type: The type of disconnect for the device. The graphics on the panel bus in the one-line diagram are controlled by this field.

Family default: The type has been set in the family using the Family Edit command. The value from the family will be used.
Main Lugs Only: The bus bar on the one-line diagram does not have a disconnect in it.
Breaker: The bus bar on the one-line diagram includes a breaker graphic.
Fused Switch: The bus bar on the one-line diagram includes a fused switch graphic.

This field is only displayed for panels and switchboards.

Main Disconnect Trip: The trip rating of the main disconnect breaker or fused switch.

Family default: The trip rating has been set in the family using the Family Edit command. The value from the family will be used.
Same as bus amps: The trip rating is the same as the Mains / Bus Amps value.
Specific ampacity: The trip rating is set to the specific size chosen from the list.

This field is only displayed for panels and switchboards.

Main Disconnect Frame: The frame size of the main disconnect breaker or fused switch.

Family default: The frame size has been set in the family using the Family Edit command. The value from the family will be used.
Same as bus amps: The frame size is the same as the Mains / Bus Amps value.
Specific ampacity: The frame size is set to the specific size chosen from the list.

Mounting: The Mounting parameter that can be set in the General section of the Properties panel for electrical equipment.

Enclosure: The Enclosure parameter that can be set in the General section of the Properties panel for electrical equipment.

Lugs: The lugs used on the electrical equipment. The setting controls the type of connection you can make on downstream electrical equipment using the Upstream Connection Type field and the graphics displayed on the bus bar on the one-line diagram.

Standard: One set of lugs at the top of the bus.
Double: Double lugs located at the top of the bus. Enables the Top Lugs option in the Upstream Connection Type field of downstream electrical equipment.
Feed Through: Lugs located at the top and bottom of the bus. Enables the Feed Through option in the Upstream Connection Type field of downstream electrical equipment.

Transformer kVA: The size of the transformer. Select the size from the list or manually enter the value.

This value can be set in the family definition using the Family Edit command. If it is, the value cannot be changed in the instance in the project.

This field is only displayed for transformers.

Transformer K-Factor Rating: The specific K-factor rating of the transformer for handling the harmonic content of the load.

This value can be set in the family definition using the Family Edit command. If it is, the value cannot be changed in the instance in the project.

This field is only displayed for transformers.

Schedule Display

Show in Feeder Schedule: Whether the electrical equipment is displayed in the feeder schedule in AutoCAD.

Show Feeder 2 in Feeder Schedule: Whether the second feeder to the electrical equipment is displayed in the feeder schedule in AutoCAD.

Show in Voltage Drop Schedule: Whether the electrical equipment is displayed in the voltage drop schedule.

Show in Fault Schedule: Whether the electrical equipment is displayed in the fault current schedule.

Show on One-Line Diagram: Whether the electrical equipment is displayed on the one-line diagram.

Upstream Connection Settings

Upstream Connection Type: How the electrical equipment is connected to the upstream electrical equipment.

Circuit: The electrical equipment is connected to a circuit. This selection is the default value for this field.
Top Lugs: The electrical equipment is connected to the top lugs of the upstream electrical equipment. This selection is only available if the Lugs field is set to Double in the upstream electrical equipment. On each piece of electrical equipment, only one connected piece of electrical equipment can be connected this way. If this is set for one piece of electrical equipment, it will not be displayed for other electrical equipment connected to the same electrical equipment.
Feed Through: The electrical equipment is connected to the feed through lugs of the upstream electrical equipment. This selection is only available if the Lugs field is set to Feed Through in the upstream electrical equipment. Only each piece of electrical equipment, only one connected piece of electrical equipment can be connected this way. If this is set for one piece of electrical equipment, it will not be displayed for other electrical equipment connected to the same electrical equipment.

Upstream OCP Trip: The trip rating of the overcurrent protection (OCP) in the device upstream of the electrical equipment. Used to set the Rating value of the connected circuit.

Same as main disconnect or bus amps: The OCP is sized to match the Mains property. This choice is available for panels and switchboards.
Size to match kVA: The OCP is sized to match the Transformer kVA field set in this dialog box. This choice is available for transformers.
Lugs or N/A: There is no OCP for this device. The Rating value of the connected electrical system is set to 0.
Specific ampacity: The OCP is set to the specific size chosen from the list.

Upstream OCP Frame: The frame size of the overcurrent protection (OCP) in the device upstream of the electrical equipment. Used to set the Rating value of the connected circuit.

Same as main disconnect or bus amps: The frame is sized to match the Mains property. This choice is available for panels and switchboards.
Size to match kVA: The frame is sized to match the Transformer kVA field set in this dialog box. This choice is available for transformers.
Specific ampacity: The frame size is set to the specific size chosen from the list.

Feeder Settings

Fed From: The upstream electrical equipment that this electrical equipment is connected to.

Feeder Length: The length of the feeder.

Default: The length is calculated using the Feeder length calculation method option set in the upstream electrical equipment using this command.
Straight line: The length is calculated based upon the straight line distance between the electrical equipment and upstream electrical equipment. This calculation approximates lengths for wires running directly between devices, typically underground.
Right angles: The length is calculated based upon the distance along the axes of the building between the electrical equipment and upstream electrical equipment. This calculation approximates lengths for wires running along the walls of the building.
Revit calculated length: A compatibility settings for projects worked on in Design Master Electrical 1.1 and earlier. The feeder length is based upon the distance that Revit calculates. It will not be available on recent projects.
Fixed: The length is a specific value provided by the user. Enter the length of the feeder in feet.

Building Angle: The orientation of the building used when Feeder Length is set to Right angles.

Conductor Amps: The ampacity of the feeder conductors. Use this field to override the automatic feeder sizing when necessary.

Size automatically: The conductors are sized based upon the Upstream OCP setting.
None: There is not feeder to this electrical equipment. The feeder callout will be set to be blank.
Specific ampacity: The conductors are sized to match the wire ampacity chosen from the list.

Neutral: Sets the size of the neutral wire in the feeder.

Family default: The neutral size has been set in the family using the Family Edit command. The value from the family will be used.
Same as phase: The neutral wire is the same size as the phase wires as specified in the Conductor Amps field.
Double phase: The neutral wire is twice the size of the phase wires as specified in the Conductor Amps field. This is accomplished by using two neutral wires.
None: No neutral wire is included in the feeder.
Specific wire size: The neutral wire is sized to match the wire size chosen from the list.

Ground: Sets the size of the ground wire in the feeder.

Family default: The ground size has been set in the family using the Family Edit command. The value from the family will be used.
Size automatically: The ground wire is sized based upon the Upstream OCP setting. If the electrical equipment is fed from a transformer, the service ground size is used. Otherwise, the equipment ground size is used.
NEC 250.122 Equipment: The ground wire is sized based upon the Equipment Ground setting for the wire ampacity specified in the Conductor Amps field.
NEC 250.102 Service: The ground wire is sized based upon the Service Ground setting for the wire ampacity specified in the Conductor Amps field.
None: No ground wire is included in the feeder.
Specific wire size: The ground wire is sized to match the wire size chosen from the list.

IG Conductor: Whether the feeder includes an isolated ground.

Family default: The need for an isolated ground has been set in the family using the Family Edit command. The value from the family will be used.
Yes: An isolated ground will be included in the feeder.
No: An isolated ground will not be included in the feeder.

Conduit Size: Sets the size of the conduit for the feeder.

Size automatically: The conduit is sized automatically based upon the wires in the feeder. All conduits are sized using a 40% conduit fill (NEC Table 1).
None: No conduit is included for the feeder.
Specific conduit size: The conduit is sized to match the conduit size chosen from the list.

Conduit Fill: The conduit fill percentage for the feeder.

Feeder Size: The callout for the feeder listing all of the chosen wire sizes.

Feeder Voltage Drop: The voltage drop in the feeder to this electrical equipment.

Total Voltage Drop: The cumulative voltage drop from the utility to this electrical equipment.

Upstream Connection 2 Settings

If the electrical equipment has two feeders, the settings for the second upstream connection are listed in this section. The settings are the same as the ones available in the Upstream Connection Settings section described above.

Feeder 2 Settings

If the electrical equipment has two feeders, the settings for the second feeder are listed in this section. The settings are the same as the ones available in the Feeder Settings section described above.

Circuit Settings

Feeder Length Calculation Method: How the lengths are calculated for feeders between this electrical equipment and electrical equipment connected to it.

Default: The lengths are calculated based upon the Feeder length calculation method option set in the Options command.
Straight line: The lengths are calculated based upon the straight line distance between the electrical equipment and other electrical equipment connected to it. This calculation approximates lengths for wires running directly between devices, typically underground.
Right angles: The lengths are calculated based upon the distance along the axes of the building between the electrical equipment and electrical equipment connected to it. This calculation approximates lengths for wires running along the walls of the building.

Branch Circuit Length Calculation Method: How the lengths are calculated for branch circuits between this electrical equipment and devices connected to it.

Default: The lengths are calculated based upon the Branch circuit length calculation method option set in the Options command.
Straight line: The lengths are calculated based upon the straight line distance between the electrical equipment and devices connected to it. This calculation approximates lengths for wires running directly between devices, typically underground.
Right angles: The lengths are calculated based upon the distance along the axes of the building between the electrical equipment and devices connected to it. This calculation approximates lengths for wires running along the walls of the building.

Building Angle: The orientation of the building used when the Feeder Length Calculation Method or Branch Circuit Length Calculation Method is set to Right angles.

Fault Calculations

Fault at Device: The fault at the electrical equipment.

Calculated: The fault at the electrical equipment is calculated based upon the model.
Fixed: Enter the fault at the electrical equipment in the lower field.

X/R Ratio: The X/R ratio at the device. If the box in the Fault at Device row is set to Fixed, you can manually set this value.

Transformer Impedance %: The impedance through the transformer, as a percentage. The fault current on the secondary of the transformer decreases when the impedance percentage increases.

Calculated: A default transformer impedance is used based upon the kVA of the transformer.

Transformer kVA

Default Transformer Impedance %

0 - 100

1.75%

112.5 - 300

2%

500

2.5%

750+

5.75%

Fixed: Enter the transformer impedance in the lower field. It can typically be obtained from the transformer manufacturer.

This value can be set in the family definition using the Family Edit command. If it is, the value cannot be changed in the instance in the project.

This field is only displayed for transformers.

Transformer X/R Ratio: The X/R Ratio of the transformer.

Calculated: A default X/R ratio of 5 is used for the transformer.
Fixed: Enter the X/R ratio in the lower field. It can typically be obtained from the transformer manufacturer.

This value can be set in the family definition using the Family Edit command. If it is, the value cannot be changed in the instance in the project.

This field is only displayed for transformers.

AIC Rating: The ampere interrupting capacity (AIC) rating for the electrical equipment. This value is not automatically calculated. It is important for you to specifically choose this value for all of the electrical equipment in the project. This field is the same value as the Short Circuit Rating parameter that can be set in the Electrical - Circuiting section of the Properties panel for electrical equipment.

Specific AIC Rating: A list of common AIC ratings is available. Choose a value from the list to use it as the AIC rating for the electrical equipment.
Custom: Choose this selection when the AIC rating for the electrical equipment is not available in the default list. Enter the AIC rating in the lower field.

Arc-Flash Calculations

Calculate Arc-Flash: Whether arc-flash is calculated for the electrical equipment. Devices that are not calculated will not be displayed in the arc-flash schedule on the drawing and will not have stickers created. Because it is difficult to sustain an arc-flash below 208V, devices with voltages less than 208V do not need arc-flash calculations performed. This box has to be manually unchecked for devices below 208V.

Equipment Type: The equipment type as described in IEEE Std 1584-2002 Table 4. The type of equipment selected sets a distance ‘x’ factor. The ‘x’ factor is used as an exponent in the calculation. Higher ‘x’ values result in higher incident energy values. The following list displays the ‘x’ factor for each type of equipment for voltages between 208V and 1,000V.

Equipment Type

x

Switchgear

1.473

MCC

1.641

Panels

1.641

Open Air

2.0

Cable

2.0

For voltages below 208V and above 1000V, consult IEEE Std 1584-2002. The ‘x’ values are slightly different, but the relative orderings are the same (switchgear is the lowest, open air and cable are the highest).

Configuration Type: Whether the device is enclosed or not. Enclosed devices reflect the arc-flash toward the worker, resulting in higher incident energy values. Most panels and other devices inside buildings should be set to Box.

Open: No enclosure, lower incident energy
Box: Enclosed equipment, higher incident energy

Grounding: The type of grounding on the device. Grounded devices have lower incident energy values.

Grounded: Lower incident energy
Ungrounded and high resistance grounded systems: Higher incident energy

Gap Between Conductors: The gap between the conductors. The most accurate calculation can be used when the gap between conductors is between 0.5" and 6". Within that range, the smaller the gap, the higher the incident energy. If possible, set the gap based the manufacturer’s specifications. Typical gaps between conductors for devices between 208V and 1,000V are listed in IEEE Std 1584-2002 Table 4.

Equipment Type

Gap Between Conductors

MCC

1"

Panels

1"

Switchgear

1.25"

Open Air

0.5" - 1.5"

Cable

0.5"

For voltages below 208V and above 1000V, consult IEEE Std 1584-2002.

Working Distance: The distance from the possible arc point to the person working on the device. It includes both the distance from the device to the worker and the distance from the front of the equipment inside to where the arc flash would occur.

The incident energy will be calculated at this distance from the device. The farther away from the device, the lower the incident energy. Any part of the body closer to the device than this distance will be exposed to higher incident energy than is calculated. If possible, set the working distance based upon the actual dimensions of the equipment. Typical working distances are given in IEEE Std 1584-2002 Table 3.

Equipment Type

Typical Working Distance

Low-voltage switchgear

24"

Low-voltage MCCs

18"

Low-voltage panelboards

18"

Cable

18"

Other

To be determined in field

Arcing Current, 100% & 85%: The predicted three-phase arcing current used to determine the operating time for the protective devices. For voltages less than 15,000V, the 100% column is calculated based on the values to the left in the grid. The 85% column is based upon the 100% column.

For voltages greater than 15,000V, the arcing current is equal to the fault current.

Arcing Time, 100% and 85%: The duration of the arc-flash has a significant impact on the incident energy in seconds. The longer you are exposed to the flash, the more intense the burn. The arcing time is based upon the time-current curve for the specific breaker you are using. These values are provided by the manufacturer and can normally be found on their website.

You are responsible for entering two values, one for the arcing time at 100% of the arcing current, and the other for the arcing time at 85% of the current.

The incident energy is a function of the arcing current and the duration. Lower arcing currents that take longer to close the breaker can result in higher incident energy values than high arcing currents. To account for this, incident energy is calculated at 100% of the arcing current value and at 85% of the arcing current value. The greater of the two incident energy values is used to determine the PPE required for the device.

Fuses must be handled differently from breakers. The time-current curves for fuses may include both melting and clearing times. Use the clearing time if it is listed. If only the melting time is listed, for greater than 0.3 seconds add 10%, otherwise add 15% to the time.

If the arcing fault current is above the total clearing time at the bottom of the curve (0.01 seconds), use 0.01 seconds.

Incident Energy, 100% and 85% Arcing Current: The total incident energy is calculated based upon the arcing current, duration, and working distance.

Required PPE: Personal Protection Equipment (PPE) rating required to work on the device. The rating is based upon the larger of the two calculated incident energy values.NFPA 70E 2012 Table 130.7(C)(16) lists the minimum arc rating for clothing in cal/cm². All of the calculations are done in J/cm². Both values are listed below.

Hazard / Risk Category

Arc Rating Range

1

0 - 16.7 J/cm²

1.2 - 4 cal/cm²

2

16.7 - 33.5 J/cm²

4 - 8 cal/cm²

3

33.5 - 104.6 J/cm²

8 - 25 cal/cm²

4

104.6 - 209.2 J/cm²

25 - 40 cal/cm²

X

> 209.2 J/cm²

> 40 cal/cm²

Arc-Flash-Protection Boundary Energy: The arc-flash-protection boundary is the approach limit for unprotected workers. You can specify the energy value. This is the amount of energy that will be delivered at the boundary distance. The default energy value of 5.0 J/cm² will limit burns to an unprotected worker to second degree during an arc-flash incident.

Arc-Flash-Protection Boundary Distance: The boundary distance is calculated based upon the specified Arc-Flash Protection Boundary Energy value.


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