Getting a Feeder Assigned to Your Motors

Questions about the use or process of Automated Branch Circuit Wiring, the Branch Circuit Manager, or the manual tools for branch circuit wiring.

Getting a Feeder Assigned to Your Motors

Postby forumadmin » Mon Jul 16, 2012 2:20 pm

There are four parameters in the 'Motors' parameters category for controlling the actions of Automated Circuiting as it relates to motors, one of which also affects how each motor gets a feeder assigned.

'Small' qualified motors, i.e. those with an FLA below the 'Small/Large Motor Full Load Amps Cutoff' Motors parameter value, will be handled by the Automated BCW code for determination of home run group and feeder. Small qualified motors will get both BCW linework and a feeder value during 'Full Cycle Branch Circuit Wiring'.

'Large' qualified motors, i.e. those with an FLA above or equal to the 'Small/Large Motor Full Load Amps Cutoff' Motors parameter value, will be handled by the Load Calculator code for determination of feeder (they are assumed to home run individually). Since the Load Calculator runs as an inherent part of any report that reports protection or feeder of any devices in your project, the 'Large' motor feeders are calculated often. Please note, however, that motors circuited along with anything else will NOT get a feeder assigned by the Load Calculator--regardless of whether the 'Small/Large Motor Full Load Amps Cutoff' Motors parameter value is set lower than the motor in question's FLA or not. The only code that can assign feeders to motors circuited along with anything else is the Full Auto BCW code--watch out for this where you have motors circuited together or motors circuited with receptacles.

Some Options on Getting Feeders Assigned to All Motors

Treat All As Large
If you have 'Small' motors in your drawing with FLAs below the cutoff you set, they are only going to get a feeder assigned if you run the Automated BCW code. If you don't want to or otherwise need to run Automated BCW, and all your motors are home running alone, then you can just adjust the 'Small/Large Motor Full Load Amps Cutoff' Motors parameter value to something very low like '.01' & run any report, like the Motor Schedule, that triggers the Load Calculator as part of its execution. All your motors will then have feeders assigned since none of them are classified as small and since none of them are sharing a circuit, the Load Calculator takes over and assigns them all a feeder value.

Mixed Small/Large Treatment
Where you don't want to have all motors handled by the Load Calculator, there is a different process to follow. Since the option to run the Load Calculator has been part of the Full Auto BCW function for some time, you can get feeders for all of your motors by running 'Full Cycle Branch Circuit Wiring' and answering 'Yes' to the 'Run Load Calculator?' dialog that shows up first (not needed if you have recently run a report that triggers it anyway and you have not changed your motors since). This process will assign feeders to large motors from the Load Calculator & feeders to small motors from Automated Branch Circuit Wiring.

Once the automation is complete, you need to decide if you want to keep the BCW linework or not. See this forums item in regards to how to use the 'Erase Lines Keep HR' tool: http://www.draftlogic.com/forum/viewtopic.php?f=11&t=151
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