#### 7.2.4.1 Pset_CableSegmentOccurrence

PSET_OCCURRENCEDRIVEN / IfcCableSegment

| Properties for the occurrence of an electrical cable, core or conductor that conforms to a type as specified by an appropriate type definition within IFC. NOTE: Maximum allowed voltage drop should be derived from the property within Pset_ElectricalCircuit.

buildingSMART Data Dictionary

PSD-XML

- DesignAmbientTemperature
  P_BOUNDEDVALUE / IfcThermodynamicTemperatureMeasure

  | DesignAmbientTemperature: The highest and lowest local ambient temperature likely to be encountered.

- UserCorrectionFactor
  P_SINGLEVALUE / IfcReal

  | UserCorrectionFactor: An arbitrary correction factor that may be applied by the user.

- NumberOfParallelCircuits
  P_SINGLEVALUE / IfcInteger

  | NumberOfParallelCircuits: Number of parallel circuits.

- InstallationMethod
  P_SINGLEVALUE / IfcLabel

  | InstallationMethod: Method of installation of cable/conductor. Installation methods are typically defined by reference in standards such as IEC 60364-5-52, table 52A-1 or BS7871 Appendix 4 Table 4A1 etc. Selection of the value to be used should be determined from such a standard according to local usage.

- InstallationMethodFlagEnum
  P_ENUMERATEDVALUE / IfcLabel / PEnum_InstallationMethodFlagEnum: INDUCT, INSOIL, ONWALL, BELOWCEILING, OTHER, NOTKNOWN, UNSET

  | InstallationMethodFlagEnum: Special installation conditions relating to particular types of installation based on IEC60364-5-52:2001 reference installation methods C and D.

- DistanceBetweenParallelCircuits
  P_SINGLEVALUE / IfcLengthMeasure

  | DistanceBetweenParallelCircuits: Distance measured between parallel circuits.

- SoilConductivity
  P_SINGLEVALUE / IfcThermalConductivityMeasure

  | SoilConductivity: Thermal conductivity of soil. Generally, within standards such as IEC 60364-5-52, table 52A-16, the resistivity of soil is required (measured in [SI] units of degK.m /W). This is the reciprocal of the conductivity value and needs to be calculated accordingly.

- CarrierStackNumber
  P_SINGLEVALUE / IfcInteger

  | CarrierStackNumber: Number of carrier segments (tray, ladder etc.) that are vertically stacked (vertical is measured as the z-axis of the local coordinate system of the carrier segment).

- MountingMethod
  P_ENUMERATEDVALUE / IfcLabel / PEnum_MountingMethodEnum: PERFORATEDTRAY, LADDER, OTHER, NOTKNOWN, UNSET

  | MountingMethod: The method of mounting cable segment occurrences on a cable carrier occurrence from which the method required can be selected. This is for the purpose of carrying out 'worst case' cable sizing calculations and may be a conceptual requirement rather than a statement of the physical occurrences of cable and carrier segments.

- IsHorizontalCable
  P_SINGLEVALUE / IfcBoolean

  | IsHorizontalCable: Indication of whether the cable occurrences are mounted horizontally (= TRUE) or vertically (= FALSE).

- IsMountedFlatCable
  P_SINGLEVALUE / IfcBoolean

  | IsMountedFlatCable: Indication of whether the cable occurrences are mounted flat (= TRUE) or in a trefoil pattern (= FALSE).

- CurrentCarryingCapasity
  P_SINGLEVALUE / IfcElectricCurrentMeasure

  | CurrentCarryingCapasity: Maximum value of electric current which can be carried continuously by a conductor, a device or an apparatus, under specified conditions without its steady-state temperature exceeding a specified value. Based on IEC60826-11-13. NOTE: The temperature specified value is maximum Design Ambient Temperature.

- MaximumCableLength
  P_SINGLEVALUE / IfcLengthMeasure

  | MaximumCableLength: Maximum cable length based on voltagedrop. NOTE: This value may also be specified as a constraint within an IFC model if required but is included within the property set at this stage pending implementation of the required capabilities within software applications.

- PowerLoss
  P_SINGLEVALUE / IfcElectricCurrentMeasure

  | PowerLoss: Total loss of power across this cable.

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