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Wish List System
2011-10-18, 06:12 PM
Summary: Add Largest Load as a Demand Factor option and formula functionality.

Description: Within each Demand factor, add the ability to have a 2nd "nested" demand factor based on certain criteria such as taking the largest of the loads and adding 25% only to that particular load. This would be helpful in calculating motor loads per the National Electrical Code (NEC) 2008 sec. 430.24. Currently I have to create a separate Demand Factor and Load Classification for identifying the "Largest Load" manually.

It would also be nice to be able to indicate a formula in the "Add an additional load to the calculated result" part of the Demand factors window. The formula should then be able to be used with circuit and project parameters similar to how you can do it in the panel schedules.

Product & Feature: Revit MEP

Submitted: Tue, 18 Oct 2011
martin.schmid
2012-09-06, 08:22 AM
This actually appears to be two separate wishes.

For the first, Revit provides the option 'Load Sub-Classification Motor' for every Power connector. When you check this box, all connections with this option checked are compared, and the largest load is factored by the Demand Factor associated with the Motor Load Classification, which provides the ability to add 25%. So, our intent is that this wish is already addressed. If this doesn't suit the need, please clarify what the need is.

For the 'Add an additional load' request, can you provide an example of how you would use this? There may be another way to accomplish what it is you're trying to do.
armand
2012-10-23, 11:12 PM
Revit MEP already calculates the largest motor load. It is lumped into the 'motor' load classification. It shows up as a 'weighted average' for the percentage demanded. This is why you will see percentages like 114.5% for your motor classification - it took the largest motor times 1.25 and the remaining motors at 100% and added those numbers together. We simply have a note block that we add to our panel schedule sheets to explain this.