Suggested Workflows for Space Heaters and Auxiliary Contacts - Intergraph Smart Electrical - Help - Hexagon

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The following scenarios are suggested workflows for the design of space heaters in your plant.

Prior to generating your single line diagrams, you have to decide if you want to represent your plant space heaters and auxiliary contacts as independent symbols or make them part of compound symbols (for example, a compound symbol that contains a circuit, circuit breaker, and an auxiliary contact). See Use Compound Symbols for Space Heaters in SLDs and Use Compound Symbols for Disconnect Equipment with Auxiliary Contacts in SLDs.

Scenario 1:

Auxiliary contact and space heater are powered from an external power supply provided by a PDB or bus that does not feed the main equipment. In this scenario, we want to create the design shown in the following single line diagram:

Space_Heater_SLD_1

To create the design shown above, do the following:

  1. In the Electrical Index or cable block diagram, create two separate electrical branches:

    • A branch for the main motor.

    • A branch for the feeder to supply the power to the auxiliary contact.

  2. Associate the space heater and its power cable with the output of the auxiliary contact.

  3. Associate the input of the auxiliary contact with its power cable and feeder. You can make the associations either in the Electrical Engineer or cable block diagram.

    1. In the Electrical Engineer, the electrical tree should look like so:

      Space_Heater_EE_1

    2. In a cable block diagram, the associations should look like so:

      Space_Heater_CBD_1

Scenario 2:

Auxiliary contact and space heater powered from a bus that does not feed the main equipment. Both the space heater and auxiliary contact are located in the same PDB. In this scenario, we want to create the design shown in the following single line diagram:

Space_Heater_SLD_2

The design can include a cable between the input of the auxiliary contact and its feeding circuit as shown above. Alternatively, you can design it without a cable. In this case, all the connections are made internally in the PDB.

To create the design shown above, do the following:

  1. In the Electrical Index or cable block diagram, create two separate electrical branches in the same PDB:

    • A branch for the main motor.

    • A branch for the feeder to supply the power to the auxiliary contact.

    There is no cable connecting the auxiliary contact and its feeder circuit because both the auxiliary contact and its feeder circuit are in the same PDB.

  2. Associate the space heater with the output of the auxiliary contact.

  3. Associate the input of the auxiliary contact with its feeder.

    You can make the associations either in the Electrical Engineer or cable block diagram.

    1. In the Electrical Engineer, the electrical tree should look like so:

      Space_Heater_EE_2

    2. In a cable block diagram, the associations should look like so:

      Space_Heater_CBD_2

Scenario 3:

Auxiliary contact and space heater powered from the same circuit as the main equipment feeder circuit. In this scenario, we want to create the design shown in the following single line diagram:

Space_Heater_SLD_3

In this design, the power for the space heater is provided by either an internal connection taken from one of the phases or by using an internal transformer that converts the three-phase 400v of the main bus to lower, single-phase voltages. The software shows these internal items as auxiliary graphics that are contained in the symbol of the auxiliary contact.

To create the design shown above, do the following:

  1. In the Electrical Index or cable block diagram, create one electrical branch for the main motor.

  2. Associate the space heater with the output of the auxiliary contact by dragging the auxiliary contact under the main circuit to supply the power to the auxiliary contact and space heater (through the auxiliary contact).

    • A branch for the feeder to supply the power to the auxiliary contact.

      There is no cable connecting the auxiliary contact and its feeder circuit because both the auxiliary contact and its feeder circuit are in the same PDB.

    1. In the Electrical Engineer, the electrical tree should look like so:

      Space_Heater_EE_3

    2. In a cable block diagram, the associations should look like so:

      Space_Heater_CBD_3

For detailed information about the creation and association of electrical items, see other topics in this section as well as the topics listed below: