#### 7.2.3.27 IfcProtectiveDevice

| Équipement de protection
| Sicherung

A protective device breaks an electrical circuit when a stated electric current that passes through it is exceeded.

A protective device provides protection against electrical current only (not as a general protective device). It may be used to represent the complete set of elements including both the tripping unit and the breaking unit that provide the protection. This may be particularly useful at earlier stages of design where the approach to breaking the electrical supply may be determined but the method of tripping may not. Alternatively, this entity may be used to specifically represent the breaking unit alone (in which case the tripping unit will also be specifically identified). This entity is specific to dedicated protective devices and excludes electrical outlets that may have circuit protection.

> HISTORY New entity in IFC4

## Electrical System Design

The following concepts are inherited at supertypes:

- IfcDistributionElement: Footprint Geometry

Instance diagram

Identity

The Identity concept applies to this entity.

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  | R | R | R | R |  |  | R | R | R
Export |  |  |  |  | R | R | R | R |  |  | R | R | R

Object Typing

The Object Typing concept applies to this entity as shown in Table 136.

Type
IfcProtectiveDeviceType
IfcDistributionElementType
Table 136 — IfcProtectiveDevice Object Typing

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  |  |  |  |  |  |  | R | R | R
Export |  |  |  |  |  |  |  |  |  |  | R | R | R

Properties for Occurrences

The Properties for Occurrences concept applies to this entity as shown in Table 137.

PredefinedType | Name
--- | ---
| Pset_ProtectiveDeviceBreakerUnitI2TCurve
| Pset_ProtectiveDeviceBreakerUnitI2TFuseCurve
| Pset_ProtectiveDeviceBreakerUnitIPICurve
CIRCUITBREAKER | Pset_ProtectiveDeviceBreakerUnitTypeMCB
| Pset_ProtectiveDeviceBreakerUnitTypeMotorProtection
| Pset_ProtectiveDeviceTrippingCurve
CIRCUITBREAKER | Pset_ProtectiveDeviceTypeCircuitBreaker
| Pset_ProtectiveDeviceTypeCommon
EARTHLEAKAGECIRCUITBREAKER | Pset_ProtectiveDeviceTypeEarthLeakageCircuitBreaker
FUSEDISCONNECTOR | Pset_ProtectiveDeviceTypeFuseDisconnector
RESIDUALCURRENTCIRCUITBREAKER | Pset_ProtectiveDeviceTypeResidualCurrentCircuitBreaker
RESIDUALCURRENTSWITCH | Pset_ProtectiveDeviceTypeResidualCurrentSwitch
VARISTOR | Pset_ProtectiveDeviceTypeVaristor
| Pset_ElectricalDeviceCommon
Table 137 — IfcProtectiveDevice Properties for Occurrences

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  | R |  | R | R |  |  |  |  | R
Export |  |  |  |  | R |  | R | R |  |  |  |  | R

Ports

The Ports concept applies to this entity as shown in Table 138.

PredefinedType | Name | Flow | Type | Description
--- | --- | --- | --- | ---
| Line | SINK | ELECTRICAL | The supply line, typically connected from a slot in a distribution board.
| Load | SOURCE | ELECTRICAL | The load protected by this device, typically a cable connected to a device or the first junction box of a circuit.
Table 138 — IfcProtectiveDevice Ports

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  | R |  |  | R |  |  |  |  | R
Export |  |  |  |  | R |  |  | R |  |  |  |  | R

Spatial Containment

The Spatial Containment concept applies to this entity.

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  | O |  |  | R |  |  |  |  | R
Export |  |  |  |  | O |  |  | R |  |  |  |  | R

Body Geometry

The Body Geometry concept applies to this entity as shown in Table 139.

RepresentationType | Geometry | Description
--- | --- | ---
Brep | IfcFacetedBrep | All fixtures (all non distribution flow elements, i.e. everything which is not a duct, a pipe, a cable, or a cable carrier) should be defined by an b-rep geometry. This includes also the complex flow fitting elements (e.g. Y branch or T branch) or distribution flow elements with size changes (e.g. reducer).
SurfaceModel | IfcFaceBasedSurfaceModel | If the geometric model consistency of a b-rep shape representation can not be guaranteed (arcwise connected volume bounded by faces, each being connected, oriented, finite, closed 2-manifold), a surface representation based on open shells should be used.
SweptSolid | IfcExtrudedAreaSolid | All "simple" distribution flow elements (general ducts and pipes) are defined by sweep geometry.
SectionedSpine | IfcSectionedSpine | If only the analytical shape is required for which the exact interpolation between the cross sections is not required, a sectioned spine can be used.
CSG | IfcCsgSolid |
Tessellation | IfcTriangulatedFaceSet |
MappedRepresentation | IfcMappedItem | All occurrences of IfcDistributionElement (and its subtypes) should (whenever possible) share a representation map established by the assigned type. The geometric representation of the occurrence is then an IfcMappedItem.
Table 139 — IfcProtectiveDevice Body Geometry

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  |  |  |  |  |  |  | R | R | R
Export |  |  |  |  |  |  |  |  |  |  | R | R | R

Placement

The Placement concept applies to this entity.

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  |  |  |  | R |  |  | R |  | R
Export |  |  |  |  |  |  |  | R |  |  | R |  | R

Classification

The Classification concept applies to this entity.

Exchange |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Import |  |  |  |  |  |  |  |  |  |  |  |  | R
Export |  |  |  |  |  |  |  |  |  |  |  |  | R

XSD Specification:

<xs:element name="IfcProtectiveDevice" type="ifc:IfcProtectiveDevice" substitutionGroup="ifc:IfcFlowController" nillable="true"/>
<xs:complexType name="IfcProtectiveDevice">
<xs:complexContent>
<xs:extension base="ifc:IfcFlowController"/>
</xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcProtectiveDevice

| SUBTYPE OF (IfcFlowController);

PredefinedType | : | OPTIONAL IfcStrippedOptional;

| WHERE

CorrectPredefinedType | : | NOT(EXISTS(PredefinedType)) OR (PredefinedType <> IfcProtectiveDeviceTypeEnum.USERDEFINED) OR ((PredefinedType = IfcProtectiveDeviceTypeEnum.USERDEFINED) AND EXISTS (SELF\IfcObject.ObjectType));
CorrectTypeAssigned | : | (SIZEOF(IsTypedBy) = 0) OR ('IFCELECTRICALDOMAIN.IFCPROTECTIVEDEVICETYPE' IN TYPEOF(SELF\IfcObject.IsTypedBy[1].RelatingType));

END_ENTITY;

Formal Propositions:

CorrectPredefinedType | : | Either the PredefinedType attribute is unset (e.g. because an IfcProtectiveDeviceType is associated), or the inherited attribute ObjectType shall be provided, if the PredefinedType is set to USERDEFINED.
CorrectTypeAssigned | : | Either there is no protective device type object associated, i.e. the IsTypedBy inverse relationship is not provided, or the associated type object has to be of type IfcProtectiveDeviceType.

Inheritance Graph:

ENTITY IfcProtectiveDevice

| ENTITY IfcRoot

GlobalId | : | IfcGloballyUniqueId;
OwnerHistory | : | OPTIONAL IfcOwnerHistory;
Name | : | OPTIONAL IfcLabel;
Description | : | OPTIONAL IfcText;

| ENTITY IfcObjectDefinition

| INVERSE

HasAssignments | : | SET OF IfcRelAssigns FOR RelatedObjects;
Nests | : | SET [0:1] OF IfcRelNests FOR RelatedObjects;
IsNestedBy | : | SET OF IfcRelNests FOR RelatingObject;
HasContext | : | SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions;
IsDecomposedBy | : | SET OF IfcRelAggregates FOR RelatingObject;
Decomposes | : | SET [0:1] OF IfcRelAggregates FOR RelatedObjects;
HasAssociations | : | SET OF IfcRelAssociates FOR RelatedObjects;

| ENTITY IfcObject

ObjectType | : | OPTIONAL IfcStrippedOptional;

| INVERSE

IsDeclaredBy | : | SET [0:1] OF IfcRelDefinesByObject FOR RelatedObjects;
Declares | : | SET OF IfcRelDefinesByObject FOR RelatingObject;
IsTypedBy | : | SET [0:1] OF IfcRelDefinesByType FOR RelatedObjects;
IsDefinedBy | : | SET OF IfcRelDefinesByProperties FOR RelatedObjects;

| ENTITY IfcProduct

ObjectPlacement | : | OPTIONAL IfcObjectPlacement;
Representation | : | OPTIONAL IfcProductRepresentation;

| INVERSE

ReferencedBy | : | SET OF IfcRelAssignsToProduct FOR RelatingProduct;

| ENTITY IfcElement

Tag | : | OPTIONAL IfcStrippedOptional;

| INVERSE

IsInterferedByElements | : | SET OF IfcRelInterferesElements FOR RelatedElement;
InterferesElements | : | SET OF IfcRelInterferesElements FOR RelatingElement;
ContainedInStructure | : | SET [0:1] OF IfcRelContainedInSpatialStructure FOR RelatedElements;

| ENTITY IfcDistributionElement

| INVERSE

| ENTITY IfcDistributionFlowElement

| INVERSE

| ENTITY IfcFlowController

| ENTITY IfcProtectiveDevice

PredefinedType | : | OPTIONAL IfcStrippedOptional;

END_ENTITY;

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