Weight Computation for Electrical Content

Electrical Physical System

The following information describes the weight computation for conductor specifications and conductor group specifications in an electrical physical system.

Considerations

You should take the following considerations into account:

Conductor Specifications: For a conductor specification, computed engineering properties are based on the properties of its conductor instance and on the length of the segments which define its route. If the conductor specification is not resolved, its computation is based on its own properties.

Conductor Group Specifications

For a conductor specification inside a conductor group, its computed engineering properties are based on the properties of its conductor instance and on the length of the unique segments which define its route. If the conductor specification is not resolved, its computation is based on its own properties. As an example, in the figure above, the computed engineering properties of Conductor1 are based on the length of Segment3.

For a conductor group specification, computed engineering properties are the sum of:

The engineering properties based on the properties of its conductor group instance (or its own if not resolved) and the length of the common segment routed for all the conductor specifications inside it.
The conductor specification engineering properties based on the properties of its conductor instance (or its own if not resolved) and the length of the unique segments which define its route.
As an example, in the figure above, the computed engineering properties of ConductorGroup1 are based on the length of Segment.1 added to the length of conductor2 in Segment.2 and the length of Conductor1 in Segment.3.

The same strategy is applied for conductor instances and conductor group instances.

Conductors and Conductor Groups Not Resolved

The following table provides information about the weight computation for routed conductors and conductor groups which are not resolved. The calculation is performed even if the routes are broken.

For the computation of resolved conductors and conductor groups, see Conductors Fully Resolved and Conductor Groups Fully Resolved below.


Engineering Property	Formula	Legend
Mass		$m$ = Mass of electrical physical system $D_{i}$ = Linear density of unresolved routed conductor specification (kg/m) $L_{i}$ = Length of unresolved routed conductor specification’s route (through unique segment(s), if inside a conductor group) $D_{g j}$ = Linear density of unresolved routed conductor group specification (kg/m) $L_{g j}$ = Length of unresolved routed conductor specification’s route (through common segment for all conductor specifications inside it)
Center of Gravity (CoG)		${C o G}_{x y x}$ = Center of gravity of electrical physical system $i$ = 1...c = Number of unresolved routed conductor specifications $s$ = 1...n = Number of segments (unique segment(s), if inside a conductor group) defining the route for the conductor specification ${C o G}_{{x y x}_{s}}$ = Center of gravity of unique segment defining a route $m_{s}$ = Mass of conductor specification in routed segment portion (through unique segment(s), if inside a conductor group) $m_{i}$ = Mass of conductor specification $j$ = 1...g = Number of unresolved routed conductor group specifications $s$ = 1...m = Number of segments (common segment for all conductor specifications inside it) defining the route for a group specification ${C o G}_{{x y x}_{g s}}$ = Center of gravity of common segment defining the route $m_{g s}$ = Mass of conductor group specification in common routed segment portion (through common segment for all conductor specifications inside it) $m_{g i}$ = Mass of conductor group specification
Volume		$V$ = Volume of Electrical physical system $d_{i}$ = Diameter of conductor specification $L_{i}$ = Length of conductor specification route (through unique segment(s), if inside a conductor group) $d_{j}$ = Diameter of conductor group specification $L_{j}$ = Length of conductor group specification route (through common segment of all conductor specifications inside it)
Area		$A$ = Area of electrical physical system $d_{i}$ = Diameter of conductor specification $L_{i}$ = Length of conductor specification route (through unique segment(s), if inside a conductor group) $d_{j}$ = Diameter of conductor group specification $L_{j}$ = Length of conductor group specification route
Moment of Inertia		$I$ = Moment of inertia of electrical physical system $I_{i}$ = Moment of inertia of conductor specification (considering unique segment(s), if inside a conductor group) $i$ = 1...n = Number of conductor specifications $I_{j}$ = Moment of inertia of conductor group specification (considering unique segment(s), if inside a conductor group) $j$ = 1...m = Number of conductor group specifications ${C o G}_{x / y / z}$ = Axial component of center of gravity of a conductor or a conductor group specification $m$ = Mass of a conductor specification (considering common or unique segment(s) for conductor and conductor group conditionally)

Conductors Fully Resolved

The following table provides information about the weight computation for resolved and routed conductor specifications.


Engineering Property	Formula	Legend
Mass		$m$ = Mass of conductor instance $D$ = Linear density of conductor instance (kg/m) $L$ = Length of associated conductor specification route (through unique segment(s), if inside a conductor group)
Center of Gravity (CoG)		${C o G}_{x y z}$ = Center of gravity of conductor instance $s$ = 1...n = Number of segments (unique if inside a conductor group instance) which define the route for associated conductor specification ${C o G}_{{x y z}_{s}}$ = Center of gravity of segment which defines the route $m_{s}$ = Mass of conductor instance in routed segment (unique for it, if inside conductor group) portion
Volume		$V$ = Volume of conductor instance $d$ = Diameter of conductor specification $L$ = Length of conductor specification route (through unique segment(s), if inside a conductor group)
Area		$A$ = Area of conductor instance $d$ = Diameter of conductor specification $L$ = Length of conductor specification route (through unique segment(s), if inside a conductor group)
Moment of Inertia		$I$ = Moment of inertia of conductor instance ${C o G}_{x / y / z}$ = Axial component of center of gravity of conductor instance $m$ = Mass of a conductor instance (through unique segment(s), if inside a conductor group)

Conductor Groups Fully Resolved

The following table provides information about the weight computation for resolved and routed conductor group specifications.


Engineering Property	Formula	Legend
Mass		$m$ = Mass of conductor group instance $D_{i}$ = Linear density of unresolved routed conductor instance (kg/m) $L_{i}$ = Length of unresolved routed conductor specification’s route (through unique segment(s), if inside a conductor group) $D_{g}$ = Linear density of unresolved routed conductor group instance (kg/m) $L_{g}$ = Length of unique segment from route of all conductor specifications inside it (through common segments for all conductor specifications inside it)
Center of Gravity (CoG)		${C o G}_{x y z}$ = Center of gravity of conductor group instance $i$ = 1...c = Number of unresolved routed conductor specifications $s$ = 1...n = Number of segments (unique segment(s) if inside conductor group) defining the route for a conductor group specification ${C o G}_{{x y z}_{s}}$ = Center of gravity of unique segment which defines a route $M_{s}$ = Mass of aggregated conductor specifications in routed segment portion (through unique segment(s), if inside a conductor group) $M_{j}$ = Mass of aggregated conductor specifications $s$ = 1...m = Number of segments (common segment for all conductor specification inside it) defining a route for a group specification ${C o G}_{{x y z}_{s}}$ = Center of gravity of common segment defining a route $M_{s}$ = Mass of conductor specification in common routed segment portion (through common segment for all conductor specification inside it) $M_{g}$ = Mass of conductor group specification
Volume		$V$ = Volume of conductor group instance $d_{i}$ = Diameter of aggregated conductor instances $L_{i}$ = Length of conductor specification route (through unique segment(s), if inside a conductor group) $d_{g}$ = Diameter of conductor group instance $L_{g}$ = Length of unique segment(s) from route of all conductor specification’s inside it (through common segment of all conductor specification inside it)
Area		$A$ = Area of conductor group instance $d_{i}$ = Diameter of aggregated conductor specifications $L_{i}$ = Length of conductor specification route (through unique segment(s), if inside conductor group) $d_{g}$ = Diameter of conductor group instance $L_{g}$ = Length of unique segment(s) from route of all conductor specifications inside it (through common segment of all conductor specification inside it)
Moment of Inertia		$I$ = Moment of inertia of conductor group instance $I_{i}$ = Moment of inertia of aggregated conductor specifications. Considering unique segment(s) if inside a conductor group $i$ = 1...n = Number of conductor specifications $I_{g}$ = Moment of inertia of conductor group instance. Considering unique segment(s) if inside a conductor group ${C o G}_{x y z}$ = Axial component of center of gravity of a conductor or a conductor group specification $m$ = Mass of a conductor specification. Considering common or unique segment(s) for conductor and conductor group conditionally

Cables

This section provides information about the weight computation of cables.

While computing the mass, COG, and moment of inertia for a cable, the following lengths of the cable are taken into account:

Length of validated routes
Extra length on cavities
Boundary length from and boundary length to
If the corresponding end device is not defined, the COG is at:
- The origin of the nearest junction device
- The midpoint of the synchronized route
Estimated length of other routes that are not validated
If one of the ends of a route is not defined, the COG is at the origin of the defined end (end device or junction device).
Extra length from and extra length to
When no route is synchronized:
- If only one end device is defined and no other device is defined, the COG is at the origin of the end device.
- If no end device is defined and only one junction device is defined, the COG is at the origin of the nearest junction device.
- If one end device is defined and no other device is defined, the COG is at the midpoint between the defined end device and the extreme junction device.
- If no end device is defined, the COG is at the midpoint between the extreme junction devices.
- If both end devices are defined, the COG is at the midpoint between the end devices.
When at least one route is synchronized:
- If only one route is synchronized, no end device is defined, and no junction device is defined before the synchronized route, the COG is at the midpoint of the synchronized route.
- If one end device is defined, the COG is at the midpoint between the end device and the nearest synchronized route.
- If a junction device exists before the nearest synchronized route, the COG is at the midpoint between the junction device and the nearest synchronized route.

You can compute the mass, COG, and moment of inertia for a cable during its synchronization with the routes in Cable Management Assistant . To do so, select the Compute cables mass, COG and MI on synchronize and length edition check box at Me > Preferences > App Preferences > 3D Modeling > Electrical & Electronic systems > Electrical 3D Design > Conductor.

You can view the computed values in the properties of the cable or using the Weight Definition B.I.

You can also compute the mass, COG, and moment of inertia for a cable based on either its design length or cutting length. To do so, specify the computation preference at Me > Preferences > App Preferences > 3D Modeling > Electrical & Electronic systems > Electrical 3D Design > Conductor.