The software provides for the creation and management of space heaters and their power supplies. It is possible to design space heaters that are powered from either the main bus circuit or another bus which does not feed the main equipment that is associated with the space heater. To illustrate the possible design scenarios, let's consider an electrical motor with an associated space heater. While the motor is fed by the main bus circuit (for example, 400V, 3.3Kv), the space heater can be fed from different buses:
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A separate PDB with a dedicated direct feeder.
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A separate PDB with a dedicated feeder circuit that powers the auxiliary contact of the main motor feeder circuit breaker (contactor or starter) and from there feeds the space heater.
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An internal auxiliary bus and feeder circuit that powers the auxiliary contacts of the circuit breaker or contactor and from there feeds the space heater.
Associating Space Heaters and Auxiliary Contacts with Main Equipment
You can associate space heaters and auxiliary contacts with the relevant electrical equipment either in the Electrical Engineer or a cable block diagram.
Presentation of Space Heaters and Auxiliary Contacts in Single Line Diagrams
After creating and the required plant items and associating them with the relevant equipment, you select whether to show the space heaters and auxiliary contacts next to their main equipment or under their feeding equipment.
Accounting for Space Heaters and Auxiliary Contacts in Load Summaries
All load summary reports include all loads with their space heaters connected to respective buses.
Accounting for Space Heaters and Auxiliary Contacts in Batch Load Associations
Space heaters connected through the main equipment circuit auxiliary contacts are shown and taken into account in the batch load association of the bus that feeds the auxiliary contact and not the main equipment bus.
On the Batch Load Association dialog, you can now select space heaters as regular loads even if they are connected through auxiliary contacts.
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Cables that have already been terminated cannot be connected to different wiring equipment. You need to disconnect them first and then connect them as needed.
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When designing electrical terminations of space heaters, to terminate the auxiliary contact with a space heater or any other electrical equipment item, terminate the cable conductors to the terminal strip of the circuit where the auxiliary contact is located.To see various recommended scenarios for working with space heaters and auxiliary contacts, see Suggested Workflows for Space Heaters and Auxiliary Contacts.
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If you are generating a cable schedule report for a cable that is connected to an auxiliary contact, the cable schedule report will display the full connection path:
PDB > Bus > Cell > Circuit > Circuit internal disconnect electrical equipment > Auxiliary contact
Or
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Stand-alone disconnect electrical equipment > Auxiliary contactWhen performing bus load association and assigning a load to another bus on the Cached Loads tab of the Bus Load Association dialog , the software checks if the selected load is associated with a heater that is connected through an auxiliary contact that is fed from the same circuit as the selected load. If the software detects such a heater, it will prompt you to move the associated circuit together with the load. If you click Yes, the software will move the load and its heater together with the associated circuit to another bus. If you click No, the software will only move the selected load without moving the heater or the circuit. In this case, you will have to move the associated heater manually.